Reproduction Abstracts

Introduction: Testes investment plays a major role in male reproductive success because larger testes are expected to produce higher sperm number and quality. In birds, comparative studies have shown that testis size – a proxy measure of postcopulatory sexual selection – is negatively related with the intraspecific variation of sperm design. By contrast, links between the intramale variation of sperm morphometry and testicular size in mammals are unknown. Here, for t...