Sperm competition was identified in 1970 as a pervasive selective force in post‐copulatory
sexual selection that occurs when the ejaculates of different males compete to fertilise a …

Males in many species invest substantially in structures that are used in combat with rivals
over access to females. These weapons can attain extreme proportions and have diversified …

The book aims to integrate our understanding of mammalian societies into a novel synthesis
that is relevant to behavioural ecologists, ecologists, and anthropologists. It adopts a …

Why do males and females frequently differ so markedly in body size and morphology? Sex,
Size, and Gender Roles is the first book to investigate the genetic, developmental, and …

Sexual selection, through intra-male competition or female choice, is assumed to be a
source of strong and sustained directional selection in the wild,. In the presence of such …

According to recent empirical studies, reproductive senescence, the decline in reproductive
success with increasing age, seems to be nearly ubiquitous in the wild. However, a clear …

Recent theoretical models predict that the evolutionary diversification of the weapons and
ornaments of pre-mating sexual selection should be influenced by trade-offs with male …

The Darwin–Bateman paradigm recognizes competition among males for access to multiple
mates as the main driver of sexual selection. Increasingly, however, females are also being …

Reproductive males face a trade-off between expenditure on precopulatory male–male
competition—increasing the number of females that they secure as mates—and sperm …

Understanding the genetic architecture of phenotypic variation in natural populations is a
fundamental goal of evolutionary genetics. Wild Soay sheep (Ovis aries) have an inherited …