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 …

Cholesterol provided by low-or high-density lipoprotein is the precursor for biosynthesis of
progesterone. Once inside the cell, cholesterol can be used for steroidogenesis or esterified …

There is clear evidence for sublethal effects of neonicotinoid insecticides on non-target
ecosystem service-providing insects. However, their possible impact on male insect …

Male reproductive success is an extremely variable fitness component. Understanding the
maintenance of this variation is a key challenge in evolutionary biology. An often neglected …

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 …

Internal fertilization requires live sperm to be transferred from male to female before egg
fertilization. Both males and females assist the insemination process by providing sperm …

In many animal species, males may exhibit one of several discrete, alternative ways of
obtaining fertilisations, known as alternative reproductive tactics (ARTs). Males exhibiting …

Sperm competition favors increases in relative testes mass and production efficiency, and
changes in sperm phenotype that result in faster swimming speeds. However, little is known …

Polyandry, where females mate with multiple males, means that a male's reproductive
success will depend both on his ability to acquire mates and the ability of his sperm to …

Polyandry generates selection on males through sperm competition, which has broad
implications for the evolution of ejaculates and male reproductive anatomy. Comparative …