SPERM WARS PDF

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We will show in this book that drawing the human body need not be so difficult. in interpretive point of view, it allo SUN TZU ON THE ART OF WAR. PDF | Females frequently mate with several males, whose sperm then compete to evolutionary consequences of the war between males for. PDF | On Sep 10, , Oliver Y Martin and others published Sperm Wars: The Movie.


Sperm Wars Pdf

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Published to acclaim and controversy a decade ago, Sperm Wars is a revolutionary thesis about sex that turned centuries-old biological assumptions on their. Sperm Wars: The Science of Sex. By Robin Baker. New. York: Basic Books, . pages. Hardcover, $ ISBN Reviewed byPaul H. Citations; Metrics; Reprints & Permissions · PDF. "Sperm Wars: The Science of Sex. By Robin Baker." Journal of Sex Education and Therapy.

Product details Paperback: Basic Books; Revised edition January 3, Language: English ISBN Start reading Sperm Wars on your site in under a minute. Don't have a site? Try the site edition and experience these great reading features: Share your thoughts with other customers. Write a customer review. Read reviews that mention sperm competition sperm wars reproductive success robin baker human sexual sexual behavior human sexuality men and women multiple partners well written sperm from different human behavior book to give human nature excellent book book is not based give this book read this book book really book very interesting.

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site Edition Verified download. A must read for every male that is in a relationship or wants to be in one. This is such a profound and absolutely essential work of literature, for any and all humans interested in anything concerning reproduction. Do yourself a favour and download it.

Gratuitous story-telling seems focused on generating soft-porn than exemplifying the theory espoused. Not well written nor offering of much info we don't already know.

I was hoping for interesting insight but got weak, circular analysis instead. One person found this helpful. Paperback Verified download. The story format of this book makes the science very accessible for people beginning to learn about how physiology interacts with sexual psychology. Great read. Well researched book. This book is very empowering. It completely negates the utterly false popular notions out there about sex. See all 75 reviews.

site Giveaway allows you to run promotional giveaways in order to create buzz, reward your audience, and attract new followers and customers. Learn more about site Giveaway. This item: Set up a giveaway. We are, however, still animal and our desires are governed as such.

Sperm wars and the evolution of male fertility.

Regarding the comments about this being 'psuedo-science', it is clear that people are furnishing their protestations with such a defaming concept to give their opinions credence. There are no references to the primary sources of information because of the audience and purpose this book is written for; it is popular science, aimed at the layman, to be able to dip in and out of without needing an expert background.

If you doubt the authenticity of the text, then check out the myriad of Robin Baker's publications in peer-reviewed journals that back up his claims. I realise that many people will only read the first and last paragraph of a review, so- read this for yourself and make your own mind up. What you might find is, if you are willing to accept it, that you may start noticing some of the practices unfold in your own sex life, or even reflect on similarities of some of the stories with your own experiences.

Even in his preface he admits there are many biologists who will view this book as a complete work of fiction, but the first time I read that did not have the same impact it had as when I was done. The entire book is comprised of "examples" he gives about sexuality, and he then explains his point of view on what "transpired" in his imagination, he explains they are not "real" situations, but are Oh my gosh this is cuckold porn disguised as a biologists view of the social realities of reproduction.

The entire book is comprised of "examples" he gives about sexuality, and he then explains his point of view on what "transpired" in his imagination, he explains they are not "real" situations, but are there for him to explain his point of view on the subject.

After reading it and reflecting There is no science, no figures, no statistical references, just a few stories, very lengthy and droning stories, about how he thinks life is exciting if you let your spouse "cheat" on you, that this is how life is, and it's so awesome.

It's one big cuckold fetish book. I can't keep myself from smiling and shaking my head about what a waste of time this book was. I mean, I like porn, but this is just ridiculous; you think he is going to describe his reason for saying something, but he goes on and on, talking about how fingers go into holes and on and on, and rarely actually gets to his point, and NEVER actually produces any real data, it's all just his opinion, again and again.

Also, I have since learned he is the only "scientist" that promotes the idea of "killer sperm", and other biologists find many of his ideas comical. In muroid rodents, the characteristic hooked morphology of the sperm head can be involved in the production of sperm conjugates, and the curvature of the hook increases with testes size, a widely used proxy for the strength of selection from sperm competition, suggesting that sperm conjugation may be an evolutionary response to selection via sperm competition in this group Immler et al.

The evolution of sperm viability Owing to the relatively paucity of studies, it is currently not possible to draw broad conclusions regarding how sperm viability is influenced by variation in the level of sperm competition.

sperm wars pdf

However, there is some evidence that sperm viability influences competitive fertilization success see Table 2. More studies that explore responses to selection on sperm viability are required. Seminal fluid proteins: the neglected weaponary Despite the considerable volume of research that has focused on how selection acts on testes size and sperm production, and sperm form and function, researchers often neglect the critical role that seminal fluids play in imparting motility and fertilization capacity to sperm.

Sperm are delivered from the male, bathed in a complex soup of proteins that are derived from the male accessory glands. Seminal fluid proteins sfps play a role in the nourishment, protection, capacitation, and motility of sperm within the female reproductive tract and should therefore be expected to contribute to a male's fertilization success Poiani In humans, for example, seminogelin I and seminogelin II inhibit sperm motility, while seminal fluid proteases cleave seminogelins after ejaculation, promoting the rapid onset of motility in the female tract Veveris-Lowe et al.

The function of sfps has been the subject of considerable research focus in the Drosophila model system. Given its critical influence, both on sperm performance and on the interactions between sperm and egg at the time of fertilization Clark et al. The evolution of male reproductive accessory glands The male reproductive accessory glands are the principle sites for the manufacture and secretion of sfps. As with testes, there is now good evidence that male expenditure on accessory glands does evolve in response to sperm competition.

A comparative analysis of male reproductive anatomy among rodent species found a positive association between the strength of selection from sperm competition and the size of the seminal vesicles and the anterior prostate, two male reproductive accessory glands that contribute proteins to the seminal fluid Ramm et al. In Drosophila melanogaster, laboratory evolution studies have shown that accessory gland productivity responds to variation in selection from sperm competition Linklater et al.

Thus, Linklater et al. The probability that females will encounter and mate with multiple males and thus the strength of selection from sperm competition was assumed to be greater in populations with a male biased sex ratio. After more than 60 generations of laboratory evolution, accessory glands evolved greater productivity in male-biased populations compared with populations with a female-biased sex ratio Linklater et al.

Similar findings were obtained in a study of Drosophila pseudoobscura in which the strength of selection from sperm competition was manipulated by either enforcing monogamy or controlling the degree to which females could mate polyandrously Crudgington et al.

Interestingly, testes size did not respond to variation in selection from sperm competition in either of these experiments, suggesting that in Drosophila seminal fluids may play an even more important role in determining competitive fertilization success than does the number of sperm a male can produce.

Molecular research is now revealing how individual sfps evolve in response to sperm competition. Non-synonymous substitutions change an amino acid while synonymous substitutions do not.

Reproductive proteins facilitate three fundamental stages of reproduction; the transit of sperm through and capacitation within the female genital tract, the storage and survival of sperm before egg release, and the interactions between sperm and egg that culminate in successful fertilization Clark et al. Genes that encode reproductive proteins involved at each of these stages appear to have evolved more rapidly than other genes.

Thus, genome screens from taxa ranging from gastropods Metz et al. There is good evidence that sexual selection via sperm competition has been instrumental in the evolutionary divergence of sfps. In house mice, the seminal vesicle protein gene Pate4 Svs7 is evolving particularly rapidly Karn et al. Seminal vesicle proteins are involved in the formation of the mating plug, the size of which is also associated with the strength of selection from sperm competition Ramm et al.

Mating plugs are thought to play a role in the prevention of mating by, and thus sperm competition from, rival males Simmons The rate of evolution of SEMG2 also correlates with the levels of female promiscuity, as does the firmness of the semen coagulum Dorus et al.

These studies strongly suggest that in primates too, sfps involved in the formation of mating plugs are under positive selection from sperm competition. Evidence for a role of sperm competition in protein evolution also comes from studies of Drosophila. Here too accessory gland genes show evidence of strong positive selection Haerty et al. It seems we know much about sfps and their function. However, to place these studies in context, for Drosophila, the number of newly discovered sfps is rising almost exponentially.

At last count, sfps had been detected, with just a handful of these having known function Chapman , Findlay et al. In mice, 69 sfps have been identified from the female reproductive tract following mating Dean et al.

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The exploration of sfps and their functional significance is in its infancy but promises to shed light on the functional mechanisms underlying sperm competitiveness. Strategic adjustments in seminal fluid composition Much research has explored male responses to sperm competition in terms of the numbers of sperm ejaculated reviewed earlier.

However, there are a growing number of studies that suggest the quality of those sperm may also be adjusted in an adaptive manner.

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Work with field crickets, Teleogryllus oceanicus, has shown how the viability of sperm in the ejaculate varies with a male's perceptions of sperm competition Simmons et al. In these insects, males appear able to detect not just the mating status of a female, be she mated or unmated, but also the number of males she has accepted, based on chemical cues left by males during copulation.

Thus, when the perceived risk of sperm competition is elevated, males will produce ejaculates containing sperm of higher viability, but as the number of males competing for fertilizations is increased beyond two males, so that the payoff from a given male's investment in his ejaculate declines, males produce ejaculates containing sperm of decreasing viability Simmons et al.

However, these studies beg the question of how males adjust the quality of their sperm?The Red Queen: Psychological Review — Proceedings of the Royal Society of London B — Google Scholar Baker, R.

For the vast offspring is also likely to invest in the benefits of sexual majority of sexual taxa with offspring sired by other males. Google Scholar Wilcox, A. Weekes-Shackelford, and A.

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