Females frequently mate with several males, whose sperm then compete to fertilize
available ova. Sperm competition represents a potent selective force that is expected to …

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 …

Females of many species mate with multiple males, thereby inciting competition among
ejaculates from rival males for fertilization. In response to increasing sperm competition …

Sperm experience intense and varied selection that dramatically impacts the evolution of
sperm quality. Selection acts to ensure that sperm are fertilization-competent and able to …

Background The influence of sperm competition upon sperm size has been a controversial
issue during the last 20 years which remains unresolved for mammals. The hypothesis that …

Evolutionary biologists have endeavoured to explain the extraordinary diversity of sperm
morphology across animals for more than a century. One hypothesis to explain sperm …

While both sperm number and quality are now recognized to be important in determining the
outcome of sperm competition, very few studies have experimentally assessed the influence …

Background Using information from physics, biomechanics and evolutionary biology, we
explore the implications of physical constraints on sperm performance, and review empirical …

Insects display a staggering diversity of mating and social behaviours. Studying these
systems provides insights into a wide range of evolutionary and behavioural questions, such …

Sexual selection is thought to favor the evolution of secondary sexual traits in males that
contribute to mating success. In species where females mate with more than one male …