Sperm Competition
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Zoological Journal of the Linnean Society (2001), 133: 369375. With 1 figure doi:10.1006/zjls.2000.0287, available online at http://www.idealibrary.com on ... Sperm size and number variation in the red flour ... LUDOVIC ARNAUD1, ERIC... more
Human, Homo sapiens, female orgasm is not necessary for conception; hence it seems reasonable to hypothesize that orgasm is an adaptation for manipulating the outcome of sperm competition resulting from facultative polyandry. If ...
Revisión del libro "Promiscuidad – Tim Birkhead (2007). Editorial Laetoli, Pamplona. 317 páginas", publicada en la revista Mètode, 2008, pp. 281
The study of human sexuality from the darwinian perspective is in an explosive phase. Recent research is diverse; for instance, the dynamics of heterosexual relationships, the role of honest advertisement in attractiveness, the role ...
Introductory courses dealing with sex, gender and sexuality are usually quite biased, going as far as to deny the reality of biology. Drawing on the Catholic tradition (Aquinas), this article presents an accessible argument aimed at... more
To study the effects of Citrullus colocynthis on testicular function and fertility, 70% methanolic extract of C. colocynthis was fed orally to male albino rats at the dose levels of 75 and 150 mg/kg body wt/day for 60 days. Oral... more
The timing of breeding may not only affect breeding patterns such as the overlap of chick rearing period with the peak in food availability but also the opportunity for extra-pair mating. A negative relationship has been predicted between... more
"Rape of women by men might be generated either by a specialized rape adaptation or as a by-product of other psychological adaptations. Although increasing number of sexual partners is a proposed benefit of rape according to the “rape as... more
Males among many species, including humans, evaluate cues of sperm competition risk and adjust accordingly their sperm competition tactics. The number of potential sexual rivals can serve as an index of sperm competition risk. Therefore,... more
The study of human sexuality from the darwinian perspective is in an explosive phase. Recent research is diverse; for instance, the dynamics of heterosexual relationships, the role of honest advertisement in attractiveness, the role ...
[Abstract] <1>centiSperm <2>Adam Zaretsky <3>Goals: To electroporate whole genomic DNA from a centipede into the center of human sperm.
There is a natural range of variation in sperm morphology inside males. This variation may be adaptive or a result of poor quality control of sperm production. Sperm aggregates can also show different morphologies inside ejaculates.... more
Many reproductive traits, including ejaculate characteristics, usually show remarkable seasonal variation, but the potential for such dynamics in sperm morphology has been overlooked. Several studies have revealed high within-male... more
Males must partition their limited reproductive investments between traits that promote access to females (sexual ornaments and weapons) and traits that enhance fertilization success, such as testes and ejaculates. Recent studies show... more
After mating, females may experience a decline in sexual receptivity and attractiveness that may be associated with changes in the production and emission of sex pheromones. In some cases, these changes are produced by chemical substances... more
Field observation and laboratory experiments were conducted to investigate sperm competition and patterns of sperm fertilization under different experimental conditions in the carrion ball-roller beetle Canthon cyanellus cyanellus. Males... more