Selective sweepstakes from pervasive positive selection, rather than demographic changes or random sweepstakes reproduction, is the primary determinant of reproductive skew and genetic diversity in the highly prolific Atlantic cod.

An ancestral enzyme tailors allocation of essential lipid resources to the progeny and connects maternal and embryonic sterol metabolism for reproductive success.

In medaka fish, the reduction of cystic proliferation of germ stem cells declines gametogenesis, reproduction success, and male sexual behavior, with a decrease of mating vigor.

Outgroup conflict can negatively impact general reproductive behaviour, egg investment, and parental care, resulting in decreased reproductive output even in the absence of physical confrontations.

A small RNA molecule called miR-124 controls pheromone production and sexual behaviour in Drosophila by regulating sex-specific gene expression in males.

The quantification of sexual selection reveals that it is important to consider the chosen time frame of measurement as well as the sexual system.

Experimental manipulations of social groups of ostriches show that the benefits of cooperative parental care for females, and the costs of sexual competition for males, lead to sex differences in optimal group sizes.

A chronic stressor prior to mating has lasting negative consequences on the fertility and fecundity of female rats, which can be prevented by blocking a single hypothalamic reproductive inhibitory hormone.

While men’s mating success is predicted both by their strength/muscularity, voice pitch, height, and testosterone levels, their reproductive output is only predicted by strength/muscularity.