Thank you for your interest in spreading the word on PNAS. Using IVF and a split-clutch design we tested for differences in embryo survival. The total number of eggs and the number of eggs exhibiting apoptotic cells were counted. Sexual reproduction entails complex co-evolution between the sexes, necessary for successful fertilization, ensuring individual and population-level fitness. J Evol Biol This reduced model was tested against the full model, using LTRs, with twice the difference in log-likelihoods assumed to follow a χ 2 distribution. Future research therefore should focus on the consequences of gametic selection in a broad variety of taxa with both external and internal fertilization.
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We placed a sample of the ejaculate of one male in the center of a µL water droplet harbored in a concave microscope slide.
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We assessed sperm longevity for every male individually and calculated halftime sperm longevity from these values for each male. Dominance over rivals, sexual attractiveness and highly efficient ejaculates are all known to be essential for male fertilization success but the theories of how primary and secondary sexual characters may co-evolve largely remain to be tested. One day before the experiments, the males were separated into unisexual groups and kept overnight. Stalling at bedtime Teething and sleep Are night-lights a good idea? Different countries may have different data-protection rules than your own. References This article was written using the following sources: