tag:blogger.com,1999:blog-52328297700284137382024-03-15T18:09:18.242-07:00The Cloacal Kiss & other Curiositiesamplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.comBlogger75125tag:blogger.com,1999:blog-5232829770028413738.post-13547891321543945602010-04-13T03:47:00.000-07:002010-04-13T03:49:11.816-07:00<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiegNdL-aq72QPHRFVzil9nDIhXilGBatg62c2x9uTojsEf83HvADsEgjS6ZzzLsLV8GRlhh9VNTpxT2ZV-sFNKXm4lZ0NhI61ue1oOUTnhlNJIHA3QP-dgGGLPfbNcTemTKTHVHhG6wTXZ/s1600/Screen+shot+2010-04-13+at+12.53.34+PM.png"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 400px; height: 279px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiegNdL-aq72QPHRFVzil9nDIhXilGBatg62c2x9uTojsEf83HvADsEgjS6ZzzLsLV8GRlhh9VNTpxT2ZV-sFNKXm4lZ0NhI61ue1oOUTnhlNJIHA3QP-dgGGLPfbNcTemTKTHVHhG6wTXZ/s400/Screen+shot+2010-04-13+at+12.53.34+PM.png" border="0" alt="" id="BLOGGER_PHOTO_ID_5459572314711798834" /></a>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com2tag:blogger.com,1999:blog-5232829770028413738.post-69024591145122265022009-11-29T18:46:00.000-08:002009-12-02T21:14:51.279-08:00Attraction & OlfactionThe fact human females would want sex at all outside of their monthly 6-day window of receptivity is an evolutionary problem. What practical purpose does it serve? Don't females have better things to do?<br /><br />Well, of course we do - but even so, those females who prescribe to a "dual sexuality" (<span class="blsp-spelling-error" id="SPELLING_ERROR_0">conceptive</span> and not <span class="blsp-spelling-error" id="SPELLING_ERROR_1">conceptive</span>) mating strategy are actually more likely to reap both the genetic and material benefits in their mate(s). There have been studies that suggest when a female is not receptive she prefers males who exhibit strong paternal and supportive attributes. These are the "nice" guys who are often pitied because they don't "get the girl." This isn't entirely true - except perhaps from a <span class="blsp-spelling-error" id="SPELLING_ERROR_2">male's</span> perspective. It really depends upon how "getting the girl" is interpreted. All but six days of the month studies have shown females to show preference towards the devout paternal male, not the <span class="blsp-spelling-corrected" id="SPELLING_ERROR_3">raucous</span> bad boy who is well endowed (genetically).<br /><br />I suppose I should pause here to explain an important concept in evolutionary biology that's relevant to this entry. I'm inferring that he who is considered of high genetic quality is the aggressive, eyebrow-pierced, pink polo-adorned male who is incapable of articulating anything that has two or more syllables. This is true to at least one extent explained by the <em>sexy son hypothesis</em>. The idea is that if a female mates with a male who is considered "attractive," she will have attractive male offspring who will be perceived as having the same appeal to the next generation of women. A vibrant example of this is the male peafowl (below).<br /><br /><img src="http://images.google.com/url?source=imgres&ct=tbn&q=http://farm4.static.flickr.com/3608/3585199795_36e9ec5442.jpg&usg=AFQjCNHbH7UspHWit8DhZox4iNk6gRrjjQ" /><br /><a href="http://farm4.static.flickr.com/3608/3585199795_36e9ec5442.jpg"><span style="font-size:78%;">image source</span><br /></a><br />One can easily see why the dual sexuality strategy would be adaptive to our female <span class="blsp-spelling-corrected" id="SPELLING_ERROR_4">ancestors</span>. A female prefers the male with whom she can share parental duties and, when she's ovulating, the male who can maximize her reproductive success in the long run. In human and nonhuman monogamous animals, females engage in extra-pair copulations during ovulation if the benefits outweigh the costs (<span class="blsp-spelling-error" id="SPELLING_ERROR_5">ie</span>. if the extra-pair male is much more genetically compatible and of course, if they don't get caught).<br /><br /><br /><strong><span style="font-size:130%;">Follow your nose...</span></strong><br />There is mounting evidence that suggests female mate choices are made through cues that reflect genetic quality ("sexy son" indicators) and material benefits ("good dad" indicators). Sexy son indicators include vocal and facial masculinity, muscles, symmetry, and body scent intensity. Good dad indicators are passiveness and feminine facial features (<span class="blsp-spelling-error" id="SPELLING_ERROR_6">eg</span>. round face and eyes).<br /><br />So... what does the pill have to do with how sexy a woman perceives a man's stench?<br /><br />The reason the pill has such a strong effect on female mate preference is because it keeps a high level of <span class="blsp-spelling-error" id="SPELLING_ERROR_7">progestin</span> (a substitute for progesterone) and estrogen in the <span class="blsp-spelling-error" id="SPELLING_ERROR_8">female's</span> system. Progesterone is a mellowing hormone and the sister to estrogen, the controlling, all-powerful hormone that is responsible for feelings of aggression and seduction. The pill tricks the body into thinking it is in a pregnant state, during which estrogen and progesterone are peaking. When a female is pregnant she does not continue the uterine cycle because a fertile egg is already gestating.<br /><br />So what do the two key components to hormonally-based birth control pills actually do?<span class="blsp-spelling-error" id="SPELLING_ERROR_9">Progestin</span> and estrogen prevent <span class="blsp-spelling-error" id="SPELLING_ERROR_10">gonatropin</span>-releasing hormone (<span class="blsp-spelling-error" id="SPELLING_ERROR_11">GnRH</span>) from being secreted by the hypothalamus. <span class="blsp-spelling-error" id="SPELLING_ERROR_12">GnRH</span> is the signal to the pituitary gland to produce follicle-stimulating hormone (<span class="blsp-spelling-error" id="SPELLING_ERROR_13">FSH</span>) and <span class="blsp-spelling-error" id="SPELLING_ERROR_14">leutinizing</span> hormone (<span class="blsp-spelling-error" id="SPELLING_ERROR_15">LH</span>). Once <span class="blsp-spelling-error" id="SPELLING_ERROR_16">GnRH</span> is blocked, the body does not secrete <span class="blsp-spelling-error" id="SPELLING_ERROR_17">FSH</span>, which prompts the body to grow a follicle, and <span class="blsp-spelling-error" id="SPELLING_ERROR_18">LH</span>, which triggers the release of the egg. The pill essentially freezes the natural cycle so it remains at a single stage for the entire month.<br /><br />The data suggests that females who are on the pill (or pregnant) do not have the same sexual <span class="blsp-spelling-error" id="SPELLING_ERROR_19">palette</span> as the non-pill user. In a study that manipulated the facial features in 20 pictures of male faces to <span class="blsp-spelling-error" id="SPELLING_ERROR_20">masculinize</span> or feminize their attributes found normally cycling women prefer less masculine faces in a <em>long-term</em> context compared to more masculine faces in a <em>short-term</em> context. Pill-users had an inverse preference and a weaker preference.<br /><br /><br /><br /><span style="font-size:130%;"><strong>Love at first smell and contraceptives</strong><br /></span><br />The <em>Major <span class="blsp-spelling-error" id="SPELLING_ERROR_21">Histocompatibility</span> Complex (<span class="blsp-spelling-error" id="SPELLING_ERROR_22">MHC</span>)</em> is a gene family that serves as an important component to a person's immune system. It creates molecules capable of identifying pathogens, or foreign invaders, so that the soldiers of the immune system can be called upon for combat. The <span class="blsp-spelling-error" id="SPELLING_ERROR_23">MHC</span> is so essential that the olfactory cues reflecting the genetic compatibility among two individuals are thought to be based off of it alone.<br /><br />Mate choice is influenced by <span class="blsp-spelling-error" id="SPELLING_ERROR_24">MHC</span> diversity through olfactory cues. <span class="blsp-spelling-error" id="SPELLING_ERROR_25">MHC</span>–peptide complexes present at the cell surface carry information about our cellular genetic make-up. When these complexes are shed from the cell surface they dissolve in our bodily fluids. This releases the peptide ligand component of the complex, which is then free to interact with other receptors (such as olfactory sensory neurons). The relevance of this has to do with the patterns of sensory neuron activation, which are unique to the structure of distinct peptide ligands. A person's distinct body odor <span class="blsp-spelling-corrected" id="SPELLING_ERROR_26">reflects</span> their <span class="blsp-spelling-error" id="SPELLING_ERROR_27">MHC</span> genotype, (drum roll) thus allowing us to assess the genetic compatibility of prospective mates!<br /><p><img id="BLOGGER_PHOTO_ID_5410824267416493474" style="DISPLAY: block; MARGIN: 0px auto 10px; WIDTH: 301px; CURSOR: hand; HEIGHT: 400px; TEXT-ALIGN: center" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5Sp1ZHqV1Zez167pCUymos5N0kLAGD94yU9-KbeXf0aJ4Z6OQG0YBHkV1n21nZ9NFDi-19vSjTMrXJzOsa_LesOD08XXQqu_Jf7i5uyVt8mEQ5cpd_pEcXeS7U-Sq9ytx4o5PJAIDPrIV/s400/mh.JPG" border="0" /> This is where contraceptive pills come into play: natural selection has played a large role in making sure individuals with similar genetic material - siblings, for instance - do not breed because the resulting offspring will have weaker immune systems and be more likely subject to a whole suite of genetic faults. The cost of mating with someone who has a similar set of <span class="blsp-spelling-error" id="SPELLING_ERROR_28">MHC</span> alleles is large for the same reason. The idea is that with lots of diversity in our <span class="blsp-spelling-error" id="SPELLING_ERROR_29">MHC</span> genes, the body is ready to take on a lot of different invaders. This diversity can only be maintained by sexual <span class="blsp-spelling-error" id="SPELLING_ERROR_30">outbreeding</span> which leads to different combinations of <span class="blsp-spelling-error" id="SPELLING_ERROR_31">MHC</span> alleles representing a richer defense strategy.<br /><br />Then the brilliant stinky t-shirt experiment was conceived:<br /><br /><object height="344" width="425"><param name="movie" value="http://www.youtube.com/v/-drpViV5LSw&hl=en_US&fs=1&"><param name="allowFullScreen" value="true"><param name="allowscriptaccess" value="always"><embed src="http://www.youtube.com/v/-drpViV5LSw&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object><br /><br />In summary, (naturally cycling) women found the odors of <span class="blsp-spelling-error" id="SPELLING_ERROR_32">MHC</span>-dissimilar males more <span class="blsp-spelling-corrected" id="SPELLING_ERROR_33">pleasant</span>. These results <span class="blsp-spelling-corrected" id="SPELLING_ERROR_34">yielded</span> a negative correlation between number of shared alleles and pleasantness ratings.<br /><br />Note, however, this test examined the preference of <span class="blsp-spelling-corrected" id="SPELLING_ERROR_35">exclusively</span> normally cycling women. When the same sweaty t-shirt test was performed on women who are taking contraceptives they found surprising results. These women didn't show a preference for the scent of males with dissimilar <span class="blsp-spelling-error" id="SPELLING_ERROR_36">MHC</span> genes. In fact, these women showed a higher preference for males with <span class="blsp-spelling-error" id="SPELLING_ERROR_37">MHC</span> genes similar to their own. If your body believes you to be in a pregnant state, this odor preference could be advantageous. Our primitive brains yearn to be surrounded by genetic similarity (<span class="blsp-spelling-error" id="SPELLING_ERROR_38">ie</span>. relatives) during this stressful and dangerous part of our <span class="blsp-spelling-corrected" id="SPELLING_ERROR_39">life cycle</span>.<br /><br />Past studies suggest there are consequences to females preferring genetically similar males as long-term partners. Couples with dissimilar <span class="blsp-spelling-error" id="SPELLING_ERROR_40">MHC</span> genes are more satisfied and more likely to be faithful to their mate. Those who have similar <span class="blsp-spelling-error" id="SPELLING_ERROR_41">MHC</span> genes report less satisfaction and more wandering eyes. There are also fertility problems encountered by <span class="blsp-spelling-error" id="SPELLING_ERROR_42">MHC</span>-similar couples, who have a much higher probability of recurrent spontaneous abortions (<span class="blsp-spelling-error" id="SPELLING_ERROR_43">RSA</span>). There have also been studies that highlight the importance of odor perception as it plays a significant role in maintaining attraction within relationships.<br /><br />So if a female acquires her male counterpart after beginning the pill, what happens when the woman goes off of it? Something I personally will never know. I'll take my sweaty man stench without the extra hormones, please.<br /><br /></p><p></p><p></p><p></p><p><br /><br /><span class="blsp-spelling-error" id="SPELLING_ERROR_44">Thornhill</span>, R., <span class="blsp-spelling-error" id="SPELLING_ERROR_45">Gangestad</span>, S. W., Miller, R., <span class="blsp-spelling-error" id="SPELLING_ERROR_46">Scheyd</span>, G., <span class="blsp-spelling-error" id="SPELLING_ERROR_47">McCollough</span>, J. K., and M. Franklin. Compatibility complex genes, symmetry and body scent attractiveness in men and women. The Research & Education Division of The Fragrance Foundation.<br /><br /><span class="blsp-spelling-error" id="SPELLING_ERROR_48">Havlicek</span>, J. and S. Roberts. 2009. <span class="blsp-spelling-error" id="SPELLING_ERROR_49">MHC</span>-correlated mate choice in humans: A review. <span class="blsp-spelling-error" id="SPELLING_ERROR_50">Psychoneuroendocrinology</span> 34: 497 - 512.</p>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-71122006932776221182009-08-23T11:03:00.000-07:002009-08-23T12:00:36.659-07:00The adaptive benefits of producing non-functional spermScientists were scratching their heads while looking for the evolutionary explanation as to why the males of a butterfly species possessed predominantly non-fertile sperm.<br /><br />What the heck is going on?<br /><br /><a href="http://philhutt.com/USERIMAGES/BUTTERFLY%20GREEN-VEINED%20WHITE%20WEB%20UPTON%20FEN%20200608%20PHIL%20130E.jpg"><img style="WIDTH: 344px; CURSOR: hand; HEIGHT: 247px" alt="" src="http://philhutt.com/USERIMAGES/BUTTERFLY%20GREEN-VEINED%20WHITE%20WEB%20UPTON%20FEN%20200608%20PHIL%20130E.jpg" border="0" /></a><br /><span style="font-size:78%;">(</span><a href="http://philhutt.com/USERIMAGES/BUTTERFLY%20GREEN-VEINED%20WHITE%20WEB%20UPTON%20FEN%20200608%20PHIL%20130E.jpg"><span style="font-size:78%;">image source</span></a><span style="font-size:78%;">)</span><br /><br />Promiscuous mating regimes are great to research if you're interested in the coevolutionary arms race between male and female reproductive interaction. Usually it is evident that males will have evolved to manipulate female receptivity and females to resist the manipulation. An interesting example lies in the green-veined white butterfly (<em>Pieris napi</em>). Male butterflies transfer fertile and non-fertile sperm to their female. The non-fertile sperm requires less energy to produce and is used because females possess a sperm-storage organ that, when full, switches off the receptivity of the female. This enforces female monogamy because she cannot successfully mate with another male until she finishes the period during which she is not receptive (due to the full sperm storage organ). This period of time is called her refractory period.<br /><br /><br />However, females have also evolved to combat the standard lengthy refractory period by shortening it significantly. It is advantageous because it allows females to mate more and therefor have a higher reproductive output. Researchers found a positive genetic correlation between non-fertile sperm transfer and female refractory period. In other words, in the context of a promiscuous mating system, sexual conflict yeilds short female refractory periods and high proportions of non-fertile sperm in males. They also found that these traits were heritable and when the mating system was manipulated, the traits would also fluctuate.<br /><br /><br />This finding is consistent with previous findings related to male-female sexual conflict: selection on female reproductive traits directly affects male traits <em>and </em>vice versa.<br /><br /><br /><br /><br />Source:<br />Nina Wedell, Christer Wiklund, and Jonas Bergström. 2009. Coevolution of non-fertile sperm and female receptivity in a butterfly. Biology Letters.amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-11506760395332253652009-07-24T18:22:00.000-07:002009-07-24T18:23:24.094-07:00Matt Ridley on the Evolution and Biology of Sex<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/X2dHFaclpv4&color1=0xb1b1b1&color2=0xcfcfcf&hl=en&feature=player_embedded&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowScriptAccess" value="always"></param><embed src="http://www.youtube.com/v/X2dHFaclpv4&color1=0xb1b1b1&color2=0xcfcfcf&hl=en&feature=player_embedded&fs=1" type="application/x-shockwave-flash" allowfullscreen="true" allowScriptAccess="always" width="425" height="344"></embed></object>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-53936973574159953282009-07-22T15:55:00.001-07:002009-07-24T18:49:47.451-07:00Mating Systems 101<p class="MsoNormal" style="text-indent: 0.5in;">In a <b style="">monogamous</b> mating system, consistent pair bonds are formed between two individuals with sexual exclusivity. <b style="">Polygamy</b> is a general term used to describe a system in which an individual mates with 2 or more partners of the opposite sex. Two subsets exist within this definition. In a <b style="">polygynous</b> system, one male mates with two or more females. In a <b style="">polyandrous</b> system, one female mates with two or more males.</p> <p class="MsoNormal" style="text-indent: 0.5in;"><b style="">Polygynandry</b> is a mating system defined by the sexual sharing among two or more females and two or more males. This term is often used interchangeably with <b style="">promiscuity</b>, but it differs because pair bonds form among specific individuals. In a promiscuous regime, no pair bonds are formed. </p> <p class="MsoNormal" style="text-indent: 0.5in;">Across the board, mating systems develop to optimize the reproductive success of individuals. Monogamy will prevail when it is most fitness enhancing for those involved. For example, if females are dispersed, which is the case in some mammal and many bird species, monogamy will likely be the dominant strategy observed. If females are forced into a small area, such as female elephant seals cramped along a shoreline, males will use the opportunity to sequester females and maximize their reproductive output. </p> <p class="MsoNormal" style="text-indent: 0.5in;">Monogamy will also prevail if the fitness of the offspring is dependent upon biparental care. In many bird species, the male and female are both fully capable of incubating the eggs and feeding hatchlings. If only one parent is involved, the probability of the chicks’ survival is compromised. Female-enforced monogamy is when a female eliminates the risk of other competing females from copulating with her chosen mate. A <a href="http://cloacalkiss.blogspot.com/2008/05/male-anglerfish-can-be-clingy.html">deep-sea angler fish</a> male is born as a small, helpless sperm packet who lacks a digestive system and is entirely dependent upon his destine host female. He swims though the deep ocean in search of her, and has specialized mouth parts that assist in him in his permanent attachment to her.</p><p class="MsoNormal" style="text-indent: 0.5in;">Polygyny is by far the most commonly observed mating system in Animalia, and its presence is based on the extent to which males can monopolize females. This model applies to species in which the territory of a male contains useful resources for the female and her offspring. The environment plays a significant role in this mating system because females are easier to sequester when resources are spatially clumped. For example, female elephant seals in the <st1:place st="on">Falkland Islands</st1:place> typically rear offspring and feed along the shoreline. Males fight one another in an effort to establish a more dominant hierarchy ranking which allows them access to the largest territory of shoreline. Once established, he is considered a <b style="">harem holder</b>, and mates with all the females who nest in his territory (a <b style="">heram group</b>). In polygynous mating systems, male reproductive success is a function of <b style="">pre-copulatory strategies </b>such as fighting in the example above. Males aim to mate with as females as possible, and females choose the male based on the quality of the territory he protects.<span style="font-size: 13.5pt;"> </span>A very small percentage of <b style="">alpha males </b>are successful harem holders among polygynous populations. The remaining male elephant seals roam the periphery of the territories, and are called <b style="">satellite males.</b></p> <p class="MsoNormal" style="text-indent: 0.5in;"><o:p> </o:p></p> <p class="MsoNormal" style="text-indent: 0.5in;">Polyandry has been considered an evolutionary problem because it was thought to challenge one of the major underpinnings of sexual selection. It is the assumption that the disparity between male and female gamete investments (<b style="">anisogamy)</b> has favored the selection for diverging mating habits between males and females. Females are thought to be the “choosier” sex because they invest more energy into generating eggs, while males tend to favor quantity over quality and their fitness will not be lowered if they mate with a female of low genetic quality. </p> <p class="MsoNormal" style="text-indent: 0.5in;">This line of thinking has gone under extreme scrutiny recently, as there has been accumulating molecular evidence revealing multiple paternity (polyandry) to be a common practice in animals. Multiple hypotheses have developed to explain this. The <b style="">material benefits hypothesis </b>predicts females who mate with more than one male are privileged to access more resources, parental care, and a limitless sperm supply. The <b style="">genetic benefits hypothesis </b>broadly predicts females who are mated with multiple males will produce offspring who are the result of superior ejaculates. If the offspring are males, they potentially have the same high quality sperm and will be able to heighten the fitness of the mother. <span style=""> </span><span style=""> </span></p> <p class="MsoNormal" style="text-indent: 0.5in;">There are unique cases that do not fit in the categories described above. For example, w<span style="color: black;">e see an investment role reversal in Red Phalaropes of Alaska. Females exhibit traditionally masculine qualities. They are bigger and more colorful than males and play no role in incubating or caring for the young. The female spends about a week courting a single male and laying her eggs in his nest. Females of this species are able to generate eggs quickly, and after a week the female begins searching for another mate. Males incubate the eggs and nurture the chicks alone.<o:p></o:p></span></p> <p class="MsoNormal" style="text-indent: 0.5in;"><span style="color: black;"><o:p> </o:p></span></p> <p class="MsoNormal" style="text-indent: 0.5in;"><span style="color: black;">Polygynandry and promiscuity are similar yet distinctly different mating systems. Polygynandrous females regularly form pair bonds and copulate with several males at the same time as males form pair bonds and copulate with several females. The polygynandrous</span><b><span style="font-size: 9.5pt; font-family: Arial;"> </span></b><span style="color: black;">European badger lives in social groups with as many as five mothers and five fathers that produce multiple-paternity litters. It is thought the primary reason for this is described by the resource dispersion hypothesis: polygynandrous groups may arise because limited optimal resources may force more than one breeding pair within a territory. There is usually a dominant pair and a number of subordinates within a social group. In some species the subordinates do not mate, but in many cases subordinate females produce litters of mixed paternity.<o:p></o:p></span></p> <p class="MsoNormal" style="text-indent: 0.5in;"><span style="color: black;">Promiscuous species are those in which pair bonds do not form and males and females are likely to copulate with more than one individual of the opposite sex</span>. It is a unique system because subordinate males have the opportunity to access females and male reproductive success is a function of <b style="">post-copulatory strategies</b> such as <b style="">sperm competition</b> and <b style="">cryptic female choice</b>. For example, when brown headed cowbirds live in areas with abundant resources, territorial lines are not well defined and promiscuity is often reported. The brown headed cowbird is a nest parasite that lays its eggs in other birds’ nests and provides no parental care for its young. Promiscuity may be the obvious choice given the birds’ behaviors and their lack of parental care.</p>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-2546102881930522502009-07-14T20:23:00.000-07:002009-07-16T16:50:04.099-07:00Traumatic Insemination in aptly named 'Harpactea sadistica' spider<p></p><br /><p>A violent but evolutionarily effective mating strategy has been spotted in spiders from Israel. Males of the aptly-named <em>Harpactea sadistica</em> species pierce the abdomen of females, fertilising their eggs directly in the ovaries. This has been described as a "traumatic insemination strategy," in which insemination wounds are created by male genitalia in areas outside the genital orifice of females. It is practiced because it gives the first male a reproductive advantage by bypassing structures in the females' genitalia.<br /></p><p>These tactics have been observed in insects such as mites, bedbugs, and flies, but this study was the first time that it was documented in spiders. Typically, spider males deliver their genetic package via sperm that manually inserted using a pair of appendages called pedipalps. </p><p></p><p><br /><br /><img src="http://palaeo.gly.bris.ac.uk/Palaeofiles/Fossilgroups/arachnid/spider1a.jpg" /><br /><br />The sperm are then held in a receptacle between the ovipore and ovary known as a spermatheca until an egg is released. However, the spermatheca is a "last in, first out" structure, so that if any further males inseminate a female, the last mate's sperm is the first in line to fertilize an egg.<br /><br />Milan Rezic, an entomologist at the Crop Research Institute in Prague, has spotted a spider circumventing this problem by delivering sperm directly to the ovaries via holes that the males bore directly in the females' abdomens. The male possesses a pair of emboli, appendages modified for piercing females. </p><p><br />The way in which the male <em>H. sadistica</em> inseminates the female is choreographed and complex. The male taps the female, subdues her, and wraps himself around her to properly position the sex organs. He then alternates between the two organs, piercing and injecting the sperm on one side, then the other. The physical marks left are two neat rows of holes in her abdomen. </p><p><br />An analysis of the females of the species has shown that relative to other spiders, their spermathecae are atrophied, or shrunken. In an apparent case of co-evolution, they seem to be slowly shrinking into nonexistence now that their purpose is being bypassed by the males' more direct approach. This is yet another example of the co-evolutionary arm's race we see between many male and female species, in which males evolve to more efficiently inseminate the female and displace other males' seminal fluid, and females evolve to be able to control who inseminates her precious eggs.</p><p>Dr. Rezac foresees the race continuing. He suggests that a means to avoid the injury caused by the males might drive the evolution of secondary genitalia nearer to the ovaries, which have been observed in some spiders and butterflies.<br /><br /></p><p></p><p>Rezac, M. 2009. The spider <em>Harpactea sadistica</em>: co-evolution of traumatic insemination and complex female genital morphology in spiders. Proceedings of the Royal Society: Biological Sciences 276(1668):2697-701.</p>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-4129614395774164742009-05-30T20:30:00.000-07:002009-07-12T12:35:41.180-07:00Drifters of the Deep<object width="400" height="225"><param name="allowfullscreen" value="true"><param name="allowscriptaccess" value="always"><param name="movie" value="http://vimeo.com/moogaloop.swf?clip_id=466491&server=vimeo.com&show_title=1&show_byline=1&show_portrait=0&color=ff9933&fullscreen=1"><embed src="http://vimeo.com/moogaloop.swf?clip_id=466491&server=vimeo.com&show_title=1&show_byline=1&show_portrait=0&color=ff9933&fullscreen=1" type="application/x-shockwave-flash" allowfullscreen="true" allowscriptaccess="always" width="400" height="225"></embed></object><p><a href="http://vimeo.com/466491">Drifters of the deep</a> from <a href="http://vimeo.com/eugenia">Eugenia Loli-Queru</a> on <a href="http://vimeo.com/">Vimeo</a>.</p>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-2886285307451966522009-05-24T14:19:00.000-07:002009-07-12T12:35:17.003-07:00When most fertile, females choose the jerkThis paper, entitled "Changes in Women’s Mate Preferences Across the Ovulatory Cylce," examined how women rated men displaying certain characteristic indicators of good genes and good investment throughout their ovulatory cycle. First, a sample of women rated men based on the following traits and characteristics: “intelligence, warmth, degree of social respect, ability to be a good father, sexual faithfulness, capacity for financial success, physical attractiveness, muscularity, confrontativeness with other men, and arrogance." The men participating in the study as subjects also rated themselves based on these characteristics. Next, a different sample of women rated the attractiveness of each man as a long-term or short-term mate.<br /><br />Their hypothesis questioned if mate preference varies depending upon where the woman is in her ovulatory cycle. They predicted that women would prefer good gene indicators when they are most fertile and good investment indicators in other contexts.<br /><br /><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9wW6hgZq-QN38vTcufYgumVg2-BV4anilyDnwNHL2NCVd7N2XOwAMTitZKMy7gSZQpjcuVQV4oQcdwOSu54niswOMwiEF2Ym8LcmmJ1SW7W01qYhTYXCjYbMZC6pDX910DSlhIkCFYjw8/s1600-h/48090_strip_little.bmp"><img id="BLOGGER_PHOTO_ID_5339511899511732050" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; WIDTH: 384px; CURSOR: hand; HEIGHT: 119px" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9wW6hgZq-QN38vTcufYgumVg2-BV4anilyDnwNHL2NCVd7N2XOwAMTitZKMy7gSZQpjcuVQV4oQcdwOSu54niswOMwiEF2Ym8LcmmJ1SW7W01qYhTYXCjYbMZC6pDX910DSlhIkCFYjw8/s400/48090_strip_little.bmp" border="0" /></a><br /><div><br /><div><br /><div><br /><div><br /><div><br /><div><br /><div><br />These indicators are important from a female perspective for a number of reasons. Females are capable of yielding a limited number of gametes in her lifetime. Gestation and lactation are also incredibly energy-consuming and required years of commitment before a woman is able to mate again to successfully rear another child. For these reasons, it is argued that women are the choosier sex.<br /><br />Examples of good gene indicators are those phenotypes that correspond to good health and developmental stability. Particularly when women seek partners as short-term mates (ahem one night stands), it is predicted that she would prefer indicators of heritable fitness, or genes that will most likely yield successful offspring. Facial symmetry and masculinized physical features are examples of good gene indicators. They reflect good health and high testosterone levels, respectively. From an evolutionary standpoint, these indicators are advantageous because they will lead to fitness-enhancing characteristics passed on to the next generation. </div><div></div><div><br />They recognized that some traits, namely paternal investment indicators, had not been tested to empirically support the hypothesis that fluctuation in female preference does not extend to traits such as warmth, kindness, and faithfulness. They hoped to examine a wider variety of physical and behavior characteristics in men that serve as indicators of good genes and good investment.<br /><br />Women’s ratings of men’s attractiveness were analyzed using a multilevel regression. The analysis described how women’s attraction to men as long-term or short-term mates related to the men’s characteristics (that both sexes were able to identify). They found that nine out of ten male traits were more preferred in the context of choosing short-term mates rather than long-term mates, including arrogance, muscularity, confrontativeness, etc.<br /><br />They also analyzed women’s preferences for male characteristics as it relates to their degree of conception risk. In other words, they were looking for characteristics of men that women found attractive when they were most fertile, or at risk of producing a conceptus. They did find significant evidence that women preferred six traits of men for short-term mate interactions more when they were most fertile! These traits include confrontativeness, arrogance, muscular physical features, social respect, and physical attractiveness.<br /><br />This supports the notion that women’s mate preferences predictably shift throughout their ovulatory cycle. When they are most fertile, women tend to preference indicators of good genes.<br /><br /><br />When they tested for fluctuations in female preference for long-term mates in good parental investment indicators across the ovulatory cycle, they found none. Women did not prefer parental investment mate qualities more when they were ovulating than when they were not. </div><div></div><div><br />These findings provide further support for the good genes hypothesis, which predicts women will prefer indicators of heritable genetic quality more when they are most fertile and assessing men as short-term mates.<br /><br /><br /><br /><br />Gangestad, S. W., Garver-Apgar, C. E., Simpson, J. A., and A. J. Cousins. 2007. Changes in Women’s Mate Preferences Across the Ovulatory Cylce. Journal of Personality and Social Psychology 92(1): 151-163. </div></div></div></div></div></div></div>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-67530899738284466412009-05-12T14:37:00.000-07:002009-07-16T16:51:12.622-07:00High emotional intelligence linked with high orgasm frequency<span class="Apple-style-span" style="LINE-HEIGHT: 16px;font-family:'Trebuchet MS';font-size:12;" ><p style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 2px; MARGIN: 5px 0px; VERTICAL-ALIGN: baseline; LINE-HEIGHT: 1.5; PADDING-TOP: 2px; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; outline-width: 0px; outline-style: initial; -webkit-background-origin: initial; outline-: initial" color="initial" size="12pt" face="Georgia, 'Times New Roman', Times, serif">According to a study in the Journal of Sexual Medicine, "variations in emotional intelligence--the ability to identify and manage emotions of one's self and others--are associated with orgasmic frequency during intercourse and masturbation."</p><p style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; FONT-SIZE: 12pt; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 2px; MARGIN: 5px 0px; VERTICAL-ALIGN: baseline; LINE-HEIGHT: 1.5; PADDING-TOP: 2px; FONT-FAMILY: Georgia, 'Times New Roman', Times, serif; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; outline-width: 0px; outline-style: initial; outline-color: initial; -webkit-background-clip: initial; -webkit-background-origin: initial">In short, the study found:</p><blockquote style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 22px; PADDING-LEFT: 22px; BORDER-LEFT-WIDTH: 0px; FONT-SIZE: 12pt; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px 12px 18px; VERTICAL-ALIGN: baseline; COLOR: rgb(17,17,17); LINE-HEIGHT: 1.75; PADDING-TOP: 0px; FONT-FAMILY: Georgia, 'Times New Roman', Times, serif; BACKGROUND-COLOR: rgb(235,235,235); BORDER-RIGHT-WIDTH: 0px; outline-width: 0px; outline-style: initial; outline-color: initial; -webkit-background-clip: initial; -webkit-background-origin: initial; quotes: none">Emotional intelligence was not associated with ... age and years of education, nor did we find a significant association between emotional intelligence and potential risk factors for [female orgasmic disorder] FOD such as age, body mass index, physical or sexual abuse, or menopause. We found emotional intelligence to be positively correlated with both frequency of orgasm during intercourse ... and masturbation .... Women in the lowest quartile of emotional intelligence had an approximate twofold increased risk of infrequent orgasm ... Low emotional intelligence seems to be a significant risk factor for low orgasmic frequency. Consideration of this behavioral risk factor may need to be incorporated into research into FOD and possible treatment approaches.</blockquote><p style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; FONT-SIZE: 12pt; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 2px; MARGIN: 5px 0px; VERTICAL-ALIGN: baseline; LINE-HEIGHT: 1.5; PADDING-TOP: 2px; FONT-FAMILY: Georgia, 'Times New Roman', Times, serif; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; outline-width: 0px; outline-style: initial; outline-color: initial; -webkit-background-clip: initial; -webkit-background-origin: initial">This is interesting, and probably a valid finding in that it appears to be statistically demonstrable that there is a correlation between measured emotional intelligence and orgasm frequency. The correlation is positive, modest (between 0.13 and 0.23 Spearman's, and confirmed with logistical regression), and statistically significant.</p><p style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; FONT-SIZE: 12pt; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 2px; MARGIN: 5px 0px; VERTICAL-ALIGN: baseline; LINE-HEIGHT: 1.5; PADDING-TOP: 2px; FONT-FAMILY: Georgia, 'Times New Roman', Times, serif; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; outline-width: 0px; outline-style: initial; outline-color: initial; -webkit-background-clip: initial; -webkit-background-origin: initial">They also found through a study using matched pairs of twins a statistically significant difference in both emotional intelligence measured by standard tests and patterns of orgasm frequency.</p><p style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; FONT-SIZE: 12pt; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 2px; MARGIN: 5px 0px; VERTICAL-ALIGN: baseline; LINE-HEIGHT: 1.5; PADDING-TOP: 2px; FONT-FAMILY: Georgia, 'Times New Roman', Times, serif; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; outline-width: 0px; outline-style: initial; outline-color: initial; -webkit-background-clip: initial; -webkit-background-origin: initial">A worthy consideration with which to read this article is that contributers to emotional intelligence come from both environmental and genetic variables. To assume this correlation is entirely due to genetics is presumably not entirely true.</p><p style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; FONT-SIZE: 12pt; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 2px; MARGIN: 5px 0px; VERTICAL-ALIGN: baseline; LINE-HEIGHT: 1.5; PADDING-TOP: 2px; FONT-FAMILY: Georgia, 'Times New Roman', Times, serif; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; outline-width: 0px; outline-style: initial; outline-color: initial; -webkit-background-clip: initial; -webkit-background-origin: initial"><br /></p><p style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; FONT-SIZE: 12pt; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 2px; MARGIN: 5px 0px; VERTICAL-ALIGN: baseline; LINE-HEIGHT: 1.5; PADDING-TOP: 2px; FONT-FAMILY: Georgia, 'Times New Roman', Times, serif; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; outline-width: 0px; outline-style: initial; outline-color: initial; -webkit-background-clip: initial; -webkit-background-origin: initial"><br /></p><p style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; FONT-SIZE: 12pt; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 2px; MARGIN: 5px 0px; VERTICAL-ALIGN: baseline; LINE-HEIGHT: 1.5; PADDING-TOP: 2px; FONT-FAMILY: Georgia, 'Times New Roman', Times, serif; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; outline-width: 0px; outline-style: initial; outline-color: initial; -webkit-background-clip: initial; -webkit-background-origin: initial">Original Source:</p><p style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; FONT-SIZE: 12pt; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 2px; MARGIN: 5px 0px; VERTICAL-ALIGN: baseline; LINE-HEIGHT: 1.5; PADDING-TOP: 2px; FONT-FAMILY: Georgia, 'Times New Roman', Times, serif; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; outline-width: 0px; outline-style: initial; outline-color: initial; -webkit-background-clip: initial; -webkit-background-origin: initial"><span class="Z3988" title="ctx_ver=" style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; VERTICAL-ALIGN: baseline; PADDING-TOP: 0px; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; outline-width: 0px; outline-style: initial; -webkit-background-origin: initial; outline-: initialfont-size:100%;color:#000a00;" included="1;bpr3.tags=" au="Spector%2C+T.&rfe_dat=" au="Burri%2C+A.&rft.au=" epage="0&rft.artnum=" issue="&rft.spage=" date="2009&rft.volume=" atitle="Emotional+Intelligence+and+Its+Association+with+Orgasmic+Frequency+in+Women&rft.issn=" rft_id="info%3Adoi%2F10.1111%2Fj.1743-6109.2009.01297.x&rfr_id=" rft_val_fmt="info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.jtitle=">Burri, A., Cherkas, L., & Spector, T. (2009). Emotional Intelligence and Its Association with Orgasmic Frequency in Women <span style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; VERTICAL-ALIGN: baseline; PADDING-TOP: 0px; FONT-STYLE: italic; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; outline-width: 0px; outline-style: initial; -webkit-background-origin: initial; outline-: initialfont-size:100%;color:#000a00;" >Journal of Sexual Medicine</span> DOI: <a style="BORDER-TOP-WIDTH: 0px; PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BORDER-LEFT-WIDTH: 0px; FONT-SIZE: 100%; BORDER-BOTTOM-WIDTH: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; VERTICAL-ALIGN: baseline; COLOR: rgb(153,0,0); PADDING-TOP: 0px; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; TEXT-DECORATION: none; outline-width: 0px; outline-style: initial; outline-color: initial; -webkit-background-clip: initial; -webkit-background-origin: initial" href="http://dx.doi.org/10.1111/j.1743-6109.2009.01297.x" rev="review">10.1111/j.1743-6109.2009.01297.x</a></span></p></span>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-44292950426645665512009-05-10T07:21:00.000-07:002009-05-10T07:29:43.475-07:00Homosexual and masturbatory behavior observed in flour beetlesThis behavior in the 0.13-inch-long (three-millimeter-long) <em>Tribolium castaneum</em>, which can be found infesting flour in most temperate areas, has been observed for decades<br /><br />They found that homosexual encounters did not improve a male's sexual success with females, as measured by the number of offspring carrying his genes. There was also no connection between homosexual activity and social dominance—male beetles that had many sexual encounters with other male beetles did not earn more attention from females.<br /><br />What the team did find was that males were dribbling sperm onto each other. This suggested that males might be trying to get rid of old sperm, lining up fresher sperm for their next female encounter.<br /><br /><img src="http://news.nationalgeographic.com/news/bigphotos/images/081104-homosexual-beetles_big.jpg" /><br /><br />The team also found that if one male leaked semen on another male and the semen-covered male later bred with a female, the female's eggs could become fertilized with the sperm of the male she had never encountered. That a male could inseminate a female without directly breeding with her came as a big surprise.<br /><br />It reveals that the flour beetles' homosexual behavior yields a direct reproductive benefit, allowing males to inseminate females without expending time or energy having sex with them.<br />"We could not believe these results when we first saw them, so we ran the experiment over and over again to make sure it was actually happening," Lewis said.<br /><br /><br /><br /><br /><br /><br />Levan, K. E., Fedina, T. Y.; Lewis, S. M. 2009. Testing multiple hypotheses for the maintenance of male homosexual copulatory behaviour in flour beetles. Journal of Evolutionary Biology. 22(1):60-70.amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-14797104049964194472009-05-10T07:12:00.000-07:002009-05-10T07:18:27.344-07:00Same-sex mating observed in fungal species<em>Cryptococcus neoformans</em> is a major cause of fungal meningitis in predominantly immunocomprised individuals.<br /><br />Recently it was discovered that <em>C. neoformans</em> can undergo same-sex mating under laboratory conditions, especially between α isolates. Whether same-sex mating occurs in nature and contributes to the current population structure was unknown.<br /><br />In this study, natural αADα hybrids that arose by fusion between two α cells of different serotypes (A and D) were identified and characterized, providing definitive evidence that same-sex mating occurs naturally. A novel truncated allele of the mating-type-specific cell identity determinant SXI1α was also identified as a genetic factor likely involved in this process.<br /><br />In addition, laboratory-constructed αADα strains exhibited hybrid vigor both in vitro and in vivo, providing a plausible explanation for their relative abundance in nature despite the fact that AD hybrids are inefficient in meiosis/sporulation and are trapped in the diploid state. These findings provide insights on the origins, genetic mechanisms, and fitness impact of unisexual hybridization in the <em>Cryptococcus</em> population.<br /><br />This study provides the first evidence of this and sheds light on the genetic and environmental factors that play important roles in the evolution of the current population structure of this pathogenic fungus.<br /><br /><br /><br /><br /><br /><br /><br /><br />Lin X, Litvintseva AP, Nielsen K, Patel S, Floyd A, et al. (2007) áADá hybrids of Cryptococcus neoformans: Evidence of same-sex mating in nature and hybrid fitness. PLoS Genet 3(10): e186. doi:10.1371/journal.pgen.0030186amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-31044303141198483132009-05-08T10:37:00.000-07:002009-05-08T10:38:02.284-07:00Virtual Heart Video<object id="flashObj" width="486" height="412" classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,47,0"><param name="movie" value="http://c.brightcove.com/services/viewer/federated_f9/2227271001?isVid=1&publisherID=981571807" /><param name="bgcolor" value="#FFFFFF" /><param name="flashVars" value="videoId=22450323001&playerID=2227271001&domain=embed&" /><param name="base" value="http://admin.brightcove.com" /><param name="seamlesstabbing" value="false" /><param name="allowFullScreen" value="true" /><param name="swLiveConnect" value="true" /><param name="allowScriptAccess" value="always" /><embed src="http://c.brightcove.com/services/viewer/federated_f9/2227271001?isVid=1&publisherID=981571807" bgcolor="#FFFFFF" flashVars="videoId=22450323001&playerID=2227271001&domain=embed&" base="http://admin.brightcove.com" name="flashObj" width="486" height="412" seamlesstabbing="false" type="application/x-shockwave-flash" allowFullScreen="true" swLiveConnect="true" allowScriptAccess="always" pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash"></embed></object>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-75942010573721729462009-04-30T20:05:00.000-07:002009-04-30T20:27:59.836-07:00Ugly Bugs!I sort of stumbled upon the Oklahoma Microscopy Society's Ugly Bug Contest Homepage.<br />What a discovery!<br />Check it out: <a href="http://www.uglybug.org/07dex.shtml">The 2007 Winners</a><br /><br /><img id="BLOGGER_PHOTO_ID_5330691466086020114" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; WIDTH: 400px; CURSOR: hand; HEIGHT: 383px" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5u0Ta9vnsGUQQV-mMD3wtYD6-7meilQbEJD5MxRcB5hJxliMPRw90UYsFDpXfwZYH922PA48fmkRMP2FYSyumV9Eyw1AHW234b5dZrhRTLHuBymSkzETJXLQ83eujK0pY-SNerQ10TtJU/s400/bug74.jpg" border="0" /><br /><div><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgewfhDcA4kd8MWWvzSWie5XgJD-Q27OkT3Usv7etK_fVQS2hyh39ghyphenhyphenWEOZNSa200deT4gsFxdowtlgah-ryoCQogdk9CFmz69daP3AQiSz1FkYRFUPbOaR0dcdzupCczt-RIPtnw8tq3W/s1600-h/bug5.jpg"><img id="BLOGGER_PHOTO_ID_5330689891936519394" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; WIDTH: 400px; CURSOR: hand; HEIGHT: 319px" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgewfhDcA4kd8MWWvzSWie5XgJD-Q27OkT3Usv7etK_fVQS2hyh39ghyphenhyphenWEOZNSa200deT4gsFxdowtlgah-ryoCQogdk9CFmz69daP3AQiSz1FkYRFUPbOaR0dcdzupCczt-RIPtnw8tq3W/s400/bug5.jpg" border="0" /></a></div><br /><div></div><br /><div><br /></div><br /><div><br /></div><br /><div></div><br /><div><br /></div><br /><div><br /></div><br /><div></div><br /><div><br /></div><br /><p></p><br /><div><br /></div><br /><p></p><br /><div></div><br /><div><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXTNKqUfc6Uyy1Hz46a52DQeJJkTbl0jmq0Zlnrnu4HU-eGr075HFUOOMXRdJI0zMJyZWd9SFWTHN8u9oxlDW9rwP6r4JzROAaQ5W9aRivTz8S7iiknT74d0o6-sSHL6FwRWtCGBdQ8o2u/s1600-h/bug7.jpg"><img id="BLOGGER_PHOTO_ID_5330689109626647282" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; WIDTH: 257px; CURSOR: hand; HEIGHT: 400px" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXTNKqUfc6Uyy1Hz46a52DQeJJkTbl0jmq0Zlnrnu4HU-eGr075HFUOOMXRdJI0zMJyZWd9SFWTHN8u9oxlDW9rwP6r4JzROAaQ5W9aRivTz8S7iiknT74d0o6-sSHL6FwRWtCGBdQ8o2u/s400/bug7.jpg" border="0" /></a><br /><br /><br /><br /><div></div></div>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-57152856850487269472009-04-25T10:39:00.000-07:002009-04-25T10:53:57.375-07:00Flora and Fauna Photography<div>These were taken during my recent trip to Key Biscayne, FL. <br /></div><div><br /></div><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEim-NBoTAy6CC60NUbHN9urnhsKtX8wS1yAysFY3EYV3JoB5VHGznxjSwkhc1Sn72xTo6-d3hByhVnR3aukoGaiwNP0ucLS1pungPliE_xBdlOUOqOmKDaBpIW4DU5vB15lkDL9G33p3VeN/s1600-h/074.JPG"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 400px; height: 300px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEim-NBoTAy6CC60NUbHN9urnhsKtX8wS1yAysFY3EYV3JoB5VHGznxjSwkhc1Sn72xTo6-d3hByhVnR3aukoGaiwNP0ucLS1pungPliE_xBdlOUOqOmKDaBpIW4DU5vB15lkDL9G33p3VeN/s400/074.JPG" border="0" alt="" id="BLOGGER_PHOTO_ID_5328688525415309554" /></a>Portuguese Man-O-War<br /><div><br /></div><div><br /></div><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKN15AoGA_UnDH89DXzi5ajPQ9DQ641IuYVgSmtmVIWAozZT_D3R04NnCih0eWws1NONAcvhk2lg9JovrodSnxAcksZkXDQlx7vW7qx8PGIhm51Y0aHLWPbx0hy5Htna8-h8s-ox9gtTQg/s1600-h/221.JPG"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 400px; height: 293px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKN15AoGA_UnDH89DXzi5ajPQ9DQ641IuYVgSmtmVIWAozZT_D3R04NnCih0eWws1NONAcvhk2lg9JovrodSnxAcksZkXDQlx7vW7qx8PGIhm51Y0aHLWPbx0hy5Htna8-h8s-ox9gtTQg/s400/221.JPG" border="0" alt="" id="BLOGGER_PHOTO_ID_5328685603747980594" /></a>Tricolored (Louisiana) Heron<div><br /></div><div><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqhf1EzhVuZi7UZgVR5MrWeKZixiy_uNczjFVMH_Xkw1ChW6ZoXXuWkWiCNQi9nCHoe5l6S8YOzKoy0FX7cMYNzfvr6V0c0gPDrRUk2woFyBjUjvlAGfcmvTM1N3j79XlZbG891uRnc48n/s1600-h/027.JPG"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 400px; height: 250px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqhf1EzhVuZi7UZgVR5MrWeKZixiy_uNczjFVMH_Xkw1ChW6ZoXXuWkWiCNQi9nCHoe5l6S8YOzKoy0FX7cMYNzfvr6V0c0gPDrRUk2woFyBjUjvlAGfcmvTM1N3j79XlZbG891uRnc48n/s400/027.JPG" border="0" alt="" id="BLOGGER_PHOTO_ID_5328685397261013170" /></a>Northern green anole <div><br /></div><div><br /></div></div>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com1tag:blogger.com,1999:blog-5232829770028413738.post-59927630295275564372009-04-12T14:31:00.000-07:002009-04-12T15:54:23.592-07:00Volcano Eruption in Galapagos National Park<div style="text-align: center;"><br /></div>La Cumbre volcano in the Galapagos Islands started spewing lava, gas and smoke on the Fernandina Island. The most recent volcanic activity on Fernandina Island occurred in May 2005. I was fortunate to attend a course that focused on the biology and evolution of the Galapagos last summer - I never stepped foot on Fernandina because my group explored the eastern portion of the archipelago.<div><br /><img style="-webkit-user-select: none" src="http://www.visitearth.asia/media/blogs/Galapagos/galapagos-map.gif" /><br /><div><br /></div><br /><div><br /></div><div><br /><br />It still breaks my heart that this eruption may have a detrimental effect on the wildlife endemic to the island. The following excerpt was taken from the <a href="http://www.globegazette.com/articles/2009/04/12/news/latest/doc49e17c332446a391023704.txt">Glob Gazette News Blog.</a></div><div><blockquote>In a statement it said the eruption is not a threat to people living on nearby Isabela Island. But it added that lava flowing to the sea will likely affect marine and terrestrial iguanas, wolves and other fauna.</blockquote><br />The iguanas we encountered on the islands were unlike any reptile I've ever seen. They also were oblivious to our presence - or mildly annoyed at worst.</div><div><br /></div><div><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBEIEjUYlfmc0gmDr28TwqUYe42TC1N27qMBzsGofNmdGqAvTzCTmTKMdklir_l0c2g6qetDhdMWoX5Kkff_oYcCZfBmkGh0gvcZ_TV98ayZy6Ok39wlGY3ex8sSFNuORGhyKxCeFC15mC/s320/marine+iguanas.jpg" border="0" alt="" id="BLOGGER_PHOTO_ID_5323927242906193378" style="float: left; margin-top: 0px; margin-right: 10px; margin-bottom: 10px; margin-left: 0px; cursor: pointer; width: 320px; height: 240px; " /></div><div><br /></div><div>This picture (left) features the Galapagos marine iguana. One of their interesting and diagnostic features was the little white cap that each wore atop their heads. Due to the high salt content in their diets, they have evolved a mechanism to maintain an internal osmotic equilibrium. They sneeze to expel excess salt from salt glands that are located above the eye. This in combination with the wind results in an accumulation of white salt on their head. When I was in the Galapagos, an ongoing pursuit among group members was to photograph a marine iguana mid- sneeze, as they expelled excess salt every few minutes. Sadly, no one was successful. I will say that there is nothing cuter than a sneezing iguana.</div><div><br /></div><div>The majority of land iguanas we saw were on Santa Fe Island. They were visible because the island had low-growing vegetation that surrounded a sparsely distrubuted <span class="Apple-style-span" style="font-style: italic;">Opuntia </span>cactus forest. </div><div><br /></div><div><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjm_Ln7Y52CtUMLcU8OxwOwADDtlgQL0on_xY01fTCAuBAo64iyD7X0xUgIX0B0H28fv7XnZ9IsgbuwWIwAZuy4dg67lNahgAUnraIlqHInyLc0QC6-wYXhClPeQlAQDuIyiKElf6t_7lBi/s1600-h/santa+fe.jpg"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjm_Ln7Y52CtUMLcU8OxwOwADDtlgQL0on_xY01fTCAuBAo64iyD7X0xUgIX0B0H28fv7XnZ9IsgbuwWIwAZuy4dg67lNahgAUnraIlqHInyLc0QC6-wYXhClPeQlAQDuIyiKElf6t_7lBi/s400/santa+fe.jpg" border="0" alt="" id="BLOGGER_PHOTO_ID_5323934264538162322" style="display: block; margin-top: 0px; margin-right: auto; margin-bottom: 10px; margin-left: auto; text-align: center; cursor: pointer; width: 400px; height: 300px; " /></a></div><div><br /></div><div>The land iguanas were quite visible, startlingly large, and usually munching on yellow purslane flowers (<span class="Apple-style-span" style="font-style: italic;">Protulaca lutea</span>).</div><div><br /></div><div><br /></div><div><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh90maLLlKrfbot0f03P7LxMPihyoMCvyd03V9vUmudS-18rxxSqQpwXe8HG8wIctjgvIccErYzVwbcETh2VwRvqXnhD5RB3G1uhM_Tlh4jgwumk9GbKKNepONbmBXKfsUtQhVAl85JqAvs/s1600-h/land+iguana.jpg" style="text-decoration: none;"><span class="Apple-style-span" style="color: rgb(0, 0, 0);"><br /></span><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh90maLLlKrfbot0f03P7LxMPihyoMCvyd03V9vUmudS-18rxxSqQpwXe8HG8wIctjgvIccErYzVwbcETh2VwRvqXnhD5RB3G1uhM_Tlh4jgwumk9GbKKNepONbmBXKfsUtQhVAl85JqAvs/s400/land+iguana.jpg" border="0" alt="" id="BLOGGER_PHOTO_ID_5323934925834530882" style="text-decoration: underline;display: block; margin-top: 0px; margin-right: auto; margin-bottom: 10px; margin-left: auto; text-align: center; cursor: pointer; width: 400px; height: 300px; " /></a></div><div><br /></div><div>I hope the population of critters who were affected by the recent eruption are able to quickly rebound. I don't know the impact's severity at this point, but I can't say enough about the importance of conserving the Galapagos Archipelago. It represents a thriving pristine wilderness as untamed territories elsewhere - everywhere - are increasingly being forced to share resources with fatal human co-inhabitants. </div><div><br /></div><div><br /></div></div>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-62277025508753958982009-04-11T12:37:00.000-07:002009-04-11T12:39:18.390-07:00Wishing you a Joyous Estrus!<div align="justify"> <p>This here is informative. Thanks <a href="http://mnatheists.org/content/view/307/164?utm_source=Minnesota+Atheists+eMail+List&utm_campaign=d001d9b704-Apr_Newsletter_04_10_09&utm_medium=email">Tom Riddering from MN Atheists.</a><br /></p><p></p><blockquote><p><br />Quick! What do eggs, flowers, the East, maidens dancing around phallic symbols, the vernal equinox, fecund rabbits, chicks, flowers, Mardi Gras, estrus cycles, and Christianity all have in common? SEX! </p> <p> Well, Christians actually call it Easter, named after Eastre, the Germanic fertility goddess, which comes from the same origin as the word "east." Why east? That's where the sun rises! The same spring sun that shines on those brightly colored chicken ova and brings new life to the earth -- flowers, chicks, bunnies, and the occasional god. Jesus wasn't the only god allegedly reborn around the vernal equinox. There was also Adonis, Osiris, Perseus, and Orpheus. </p> <p> Spring is when we have the licentious festivals of Mardi Gras, Carnival, and the ancient Roman fertility festival of Lupercalia. It's when the Kanamara Matsuri (Festival of the Steel Phallus) is celebrated in Japan. Nothing subtle about those Buddhists and Shinto! It's when pre-Christian pagans all over the earth celebrated the return of life after the dark death of winter and propitiated their gods for a successful growing season by celebrating their fertility. The early Christian church couldn't eradicate this popular festival, so they hijacked it and assigned new theological meaning to it. But under all that sanctimonious piety, Easter is nothing but the spring fertility rites. Now that's something even atheists can celebrate!<br /></p></blockquote><br /><p><br /></p><p><br /></p> </div>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-38615943226437507062009-04-07T04:58:00.000-07:002009-04-07T05:00:13.311-07:00<p><object height="344" width="425"><param name="movie" value="http://www.youtube.com/v/RaogWgXtVe8&color1=0xb1b1b1&color2=0xcfcfcf&hl=en&feature=player_embedded&fs=1"><param name="allowFullScreen" value="true"><embed src="http://www.youtube.com/v/RaogWgXtVe8&color1=0xb1b1b1&color2=0xcfcfcf&hl=en&feature=player_embedded&fs=1" type="application/x-shockwave-flash" allowfullscreen="true" width="425" height="344"></embed></object></p><p></p><p>David Attenborough: Evolution from Sea to Land</p>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-16445420692918277762009-04-06T11:02:00.000-07:002009-04-07T05:01:00.194-07:00How to Define an Open Mind"Science promotes and thrives on open-mindedness because the advancement of our understanding about the reality in which we exist depends upon our willingness to accept new ideas."<br /><br /><br /><object height="344" width="425"><param name="movie" value="http://www.youtube.com/v/T69TOuqaqXI&hl=en&fs=1"><param name="allowFullScreen" value="true"><param name="allowscriptaccess" value="always"><embed src="http://www.youtube.com/v/T69TOuqaqXI&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com1tag:blogger.com,1999:blog-5232829770028413738.post-68609312455676032582009-04-03T07:53:00.000-07:002009-04-07T05:01:45.934-07:00Temperature-dependent Sex Determination in Humans!?This is some wonderfully strange new research. Girls are more likely to be born at tropical latitudes than in temperate or subarctic climates. This study provides the first <em>global</em> look at human sex ratios and could shed light on how temperature and day length influence human reproduction. This article reminded me of temperature-dependent sex ratio of reptiles, and I'm not at all surprised that the length of day and temperature would induce a change in sex ratio.<br /><br />Strangely, in reptiles there is polar variation in the effect temperature has on the outcome of the offspring among taxonomic groups. In crocodiles and alligators, for example, eggs incubated in temperatures below 30 °C produce female offspring and eggs incubated above 34 °C produces male offspring. In turtles, however, at cooler temperatures ranging between 22.5°C and 27 °C mostly male turtles are produced and at warmer temperatures, around 30°C, only female turtles arise. Many other animals adjust the sex of their offspring based on environmental cues such as temperature, but to confirm whether humans do to some extent is difficult to measure. There are multiple variables that have been confirmed to also affect the human sex ratio, such as stress imposed on the mother during pregnancy. How would one overcome this obstacle?<br /><br /><br /><br /><img src="http://sciencenow.sciencemag.org/content/vol2009/issue401/images/200940111.jpg" /><br /><br /><br /><br />Reproductive endocrinologist Kristen Navara of the University of Georgia in Athens analyzed global sex ratios over 10 years, enough time to be sure that short-term social or economic crises weren't driving the results. Navara had previously found that Siberian hamsters raised with fewer hours of daylight produced more male offspring, and she wondered if the same might be true for humans. Navara gathered sex ratio data for every nation within a decade of uninterrupted statistics. She then analyzed the figures from 202 countries based on latitude, average temperature, day length, and socioeconomic status.<br /><br />She found that humans living in areas with long, dark winters have more boys: 51.3% of babies born in temperate and subarctic regions are male, compared with 51.1% in the tropics. No one knows exactly when or how sex selection happens, but Navara says that some animals skew sex ratios as early as fertilization. "I suspect that all of this has something to do with melatonin," a hormone that regulates sleep-wake cycles and the production of female reproductive hormones, says Navara, noting that melatonin release varies in response to day length and season.<br /><br /><br />Navara, Kristen J. 2009. Humans at tropical latitudes produce more females. Biology letters.amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-19927206413414555502009-03-23T11:09:00.000-07:002009-03-23T11:10:01.791-07:00When animals attack our morals<table style='font:11px arial; color:#333; background-color:#f5f5f5' cellpadding='0' cellspacing='0' width='360' height='353'><tbody><tr style='background-color:#e5e5e5' valign='middle'><td style='padding:2px;'><a target='_blank' style='color:#333; text-decoration:none;' href='http://www.colbertnation.com/'>The Colbert Report</a></td><td style='padding:2px; text-align:right'>Mon - Thurs 11:30pm / 10:30c</td></tr><tr style='height:14px;' valign='middle'><td style='padding:2px;' colspan='2'><a target='_blank' style='color:#333; text-decoration:none;' href='http://www.colbertnation.com/the-colbert-report-videos/222215/march-19-2009/when-animals-attack-our-morals---chimps--lizards---spiders'>When Animals Attack Our Morals - Chimps, Lizards & Spiders</a></td></tr><tr style='height:14px; background-color:#353535' valign='middle'><td colspan='2' style='padding:2px; width:360px; overflow:hidden; text-align:right'><a target='_blank' style='color:#96deff; text-decoration:none' href='http://www.comedycentral.com'>comedycentral.com</a></td></tr><tr valign='middle'><td style='padding:0px;' colspan='2'><embed src='http://media.mtvnservices.com/mgid:cms:item:comedycentral.com:222215' width='360' height='301' type='application/x-shockwave-flash' wmode='window' allowFullscreen='true' flashvars='autoPlay=false' allowscriptaccess='always' allownetworking='all' bgcolor='#000000'></embed></td></tr><tr style='height:18px;' valign='middle'><td style='padding:0px;' colspan='2'><table style='margin:0px; text-align:center' cellpadding='0' cellspacing='0' width='100%' height='100%'><tr valign='middle'><td style='padding:3px;'><a target='_blank' style='font:10px arial; color:#333; text-decoration:none;' href='http://www.comedycentral.com/colbertreport/full-episodes'>Colbert Report Full Episodes</a></td><td style='padding:3px;'><a target='_blank' style='font:10px arial; color:#333; text-decoration:none;' href='http://www.indecisionforever.com'>Political Humor</a></td><td style='padding:3px;'><a target='_blank' style='font:10px arial; color:#333; text-decoration:none;' href='http://www.colbertnation.com/the-colbert-report-videos/221838/march-16-2009/better-know-a-governor---mark-sanford'>Mark Sanford</a></td></tr></table></td></tr></tbody></table>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-511241805363122922009-03-22T05:49:00.000-07:002009-04-07T05:02:34.007-07:00Sex bias is entirely controlled by the females in Gouldian FinchesThe birds, which have either red or black heads, prefer to mate with males with the same head colouring, as this signifies a better genetic match. A report in the journal Science says that the birds compensate for this by having more male chicks in their brood. Colourful Gouldian finches can judge if a mate is genetically compatible just by looking at its head.<br /><br />This new study has found that, when the female finches mate with a male that has a different head colour, they select the sex of their offspring - giving their chicks a better chance of survival.<br /><img height="300" alt="Two male Gouldian finches" hspace="0" src="http://newsimg.bbc.co.uk/media/images/45583000/jpg/_45583621_pryke5hr.jpg" width="466" border="0" /><br /><br />In birds, the sex of an egg is already determined before it is fertilised by the male.<br />Sarah Pryke, a biologist from Macquarie University in Sydney, led this study. She found that when female finches mate with mismatched males, 70% of their chicks are male.<br /><br />Dr Pryke's team disguised some of the male finches to show that this "sex bias" is entirely controlled by the females. They blackened the head feathers of red males, using a non-toxic dye, and paired them to both red and black females to allow them to breed.<br /><br />The birds were fooled, and the team found that black females that mated with the "disguised" red males produced an equal ratio of male and female chicks. "This is the clearest and perhaps most extreme example of sex biasing that has been found," said Dr Pryke. "It's really black and white - or in this case black and red."<br /><br />"It is pretty amazing to think that the female herself has so much control - subconsciously of course - over this basic physiology," said Dr Pryke.<br /><br />The results were particularly striking because colour-matched matings, which result in much healthier broods, always produce roughly equal numbers of male and female chicks. "Females really don't want to mate with a male with a different head colour. But there simply aren't enough compatible males, so later in the mating season they seem to use this control to make the best of a bad situation."<br /><br /><br /><br />From <a href="http://news.bbc.co.uk/2/hi/science/nature/7953467.stm">BBC News</a>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com1tag:blogger.com,1999:blog-5232829770028413738.post-90781589157459039772009-03-19T17:24:00.000-07:002009-04-07T05:02:12.154-07:00The Fish-Tetrapod Transition<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEieDCDruIuy7eeeZMWBgvY84lF6uwbw-to1XCakX9eCHmRb92L6pdUn0eQWLOVPMoT3vxxFHfGcaLNQ7A-9OeDv9puLwFC6YR0TcAypZyJxa__QkkUaStM0jAn9tr83znv0ewaR4-9MZ_6T/s1600-h/untitled.bmp"><img id="BLOGGER_PHOTO_ID_5315062193057443490" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; WIDTH: 400px; CURSOR: hand; HEIGHT: 299px" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEieDCDruIuy7eeeZMWBgvY84lF6uwbw-to1XCakX9eCHmRb92L6pdUn0eQWLOVPMoT3vxxFHfGcaLNQ7A-9OeDv9puLwFC6YR0TcAypZyJxa__QkkUaStM0jAn9tr83znv0ewaR4-9MZ_6T/s400/untitled.bmp" border="0" /></a><br /><br />With the vertebrate comparative anatomy lab quickly approaching in my Animal Diversity class, I was excited to fall upon a paper that appears well-tailored to the content of my own teaching schedule (for once! geesh). This is spankin' new, published March 17, 2009, from the journal <a href="http://www.springerlink.com/content/120878/?p=230b1c8ba4db452ba41415ecd95a5dab&pi=0">Evolution: Education and Outreach</a>.<br /><br /><p></p><p></p><p></p><p>This paper is paricularly interesting because it outlines both the history of tetrapod evolution and the history of human's <em>perception</em> of the animal transition from aquatic to terrestrial habitats. It highlights the helpful fossils unearthed that helps us trace this vertebrate history, such as <em>Icthyostega spp., </em>and those fossils, such as the <em>Eryops cephalus, </em>that hindered the pursuit. In the case of the latter organism (pictured below), despite its anatomy being characteristic of an early trasitional tetrapod, its ancestral origin was found to exist much later in tetrapod evolution.<br /><br /><br /><img style="WIDTH: 322px; HEIGHT: 265px" height="462" src="http://www.fossilmuseum.net/fossils/amphibians/Eryops/Eryops1.JPG" width="476" /> </p><p>This paper also describes the reason for the recent fame of the <a href="http://www.blogger.com/www.cloacalkiss.blogspot.com/2008/12/tiktaalik-your-inner-fish.html">Tiktaalik</a> transitional fossil, as it is known from several nearly complete specimens. Its excellent preservation and diagnostic transitional tetrapod features have made it an important tool for understanding the origin of the phylogenetic tree of Tetrapoda.</p><blockquote><p><br />"In a nutshell, the 'fish–tetrapod transition' usually refers to the origin, from their fishy ancestors, of creatures with four legs bearing digits (fingers and toes), and with joints that permit the animals to walk on land. This event took place between about 385 and 360 million years ago toward the end of the period of time known as the Devonian. The Devonian is often referred to as the 'Age of Fishes,' as fish form the bulk of the vertebrate fossil record for this time."</p><p></p></blockquote><p>This paper is a great read for eager young biologists like myself searching for readable scientific papers on phylogenetics and evolution. I recommend it!</p><p><br /><a href="http://www.springerlink.com/content/v16470436056263j/">The Fish–Tetrapod Transition: New Fossils and Interpretations</a><br /><br /><br /><a href="http://www.springerlink.com/content/v16470436056263j/fulltext.pdf"></a><br /><br /><br /></p>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com2tag:blogger.com,1999:blog-5232829770028413738.post-3033067826335860422009-03-16T20:19:00.000-07:002009-04-07T05:03:47.346-07:00More Coleopterans Coitus<p><img height="310" alt="Seed Beetle 1.jpg" src="http://scienceblogs.com/zooillogix/upload/2009/02/size_and_number_of_tortuous_sp/Seed%20Beetle%201.jpg" width="400" /></p><p></p><p>A new study has revealed the painfully scandalous anatomy of <em>C. maculatus</em> seed beetles. The <em>C. maculatus</em> have a series of spikes and barbs on their members that, during sex, become embedded in their mates, acting as anchors of sorts.</p><p><img height="400" alt="Seed beetle 3.jpg" src="http://scienceblogs.com/zooillogix/upload/2009/02/size_and_number_of_tortuous_sp/Seed%20beetle%203.jpg" width="461" /><br /><br />"They literally injure females internally in their copulatory duct. They're pretty mean," Goran Arnqvist, the lead author of the study, said to <a href="http://news.nationalgeographic.com/news/2009/02/090225-seed-beetle-sex.html">National Geographic</a>.<br /><br />After looking at a large group of diverse, virgin beetles after copulation the study concluded that the beetles with the "largest and most damaging" phalluses had the most reproductive success. The injury to the females was simply an "unfortunate side effect" of the process. </p><p>At this point, I will use what little class I have to bite my tongue. </p><p></p><p><img height="310" alt="Seed beetle 2.jpg" src="http://scienceblogs.com/zooillogix/upload/2009/02/size_and_number_of_tortuous_sp/Seed%20beetle%202.jpg" width="400" /><br /></p><p><img height="346" alt="Seed beetle 5.jpg" src="http://scienceblogs.com/zooillogix/upload/2009/02/size_and_number_of_tortuous_sp/Seed%20beetle%205.jpg" width="461" /><br />Above: a seed beetle's jaw-like spine structure on its appendage. </p>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-10152813908702701552009-03-16T14:51:00.000-07:002009-03-19T18:11:35.008-07:00<p align="left"><img style="WIDTH: 425px; HEIGHT: 556px" height="746" src="http://images.ucomics.com/comics/db/2005/db051218.gif" width="380" /></p>amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0tag:blogger.com,1999:blog-5232829770028413738.post-57776710951805793052009-03-10T14:03:00.001-07:002009-03-10T14:07:09.859-07:00A Sea Biscuit's Life<object type="application/x-shockwave-flash" allowscriptaccess="never" allownetworking="internal" data="http://vimeo.com/moogaloop.swf?clip_id=2156713&server=vimeo.com&show_title=1&show_byline=1&show_portrait=0&color=&fullscreen=1" height="302" width="400">I'm teaching about Echinoderms this week in Animal Diversity lab. They exhibit pentaradial symmetry as adults, but are actually born with bilateral symmetry. Put a beat to that concept, and you have a dance party (below).<br /> <param name="allowScriptAccess" value="never"><br /> <param name="allowNetworking" value="internal"><br /> <param name="movie" value="http://vimeo.com/moogaloop.swf?clip_id=2156713&server=vimeo.com&show_title=1&show_byline=1&show_portrait=0&color=&fullscreen=1"><br /> <param name="wmode" value="transparent"><br /></object><br /><a href="http://www.msplinks.com/MDFodHRwOi8vdmltZW8uY29tLzIxNTY3MTM=" target="_blank">A Sea Biscuit's Life</a> from <a href="http://www.msplinks.com/MDFodHRwOi8vdmltZW8uY29tL25lbGFz" target="_blank">Bruno Vellutini</a> on <a href="http://www.msplinks.com/MDFodHRwOi8vdmltZW8uY29t" target="_blank">Vimeo</a>.amplexushttp://www.blogger.com/profile/18051061543709560964noreply@blogger.com0