Ejaculates are fundamental to fitness in sexually reproducing animals: males gain all their
direct fitness via the ejaculate and females require ejaculates to reproduce. Both sperm and …

Sperm production and allocation strategies have been a central concern of sperm
competition research for the past 50 years. But during the 'sexual cascade'there may be …

Among vertebrates, fish show by far the greatest variability of alternative reproductive tactics
(ARTs). Usually, males attempting to monopolize access to females or fertilizations are …

The Gobiiformes is one of the most diverse orders of the Percomorphs, with approximately
2000 species in 270 genera. They represent 5 to 10% of all teleosts, with species occurring …

In guppies (Poecilia reticulata) precopulatory sexual selection (via female choice) and post‐
copulatory selection (via sperm competition) both favour males with relatively high levels of …

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

Fish commonly use reproductive hormones (steroids and prostaglandins) both as
endogenous signals between reproductive tract and brain and as exogenous signals …

Males that exhibit alternative reproductive tactics (ARTs) often differ in the risk of sperm
competition and the energetic trade-offs they experience. The resulting patterns of selection …

This chapter looks at some of the diversity of gross morphology in testes and spermatozoa in
the fishes in the context of sexual selection resulting from sperm competition. It explains why …

Publisher Summary The study of fish hormonal pheromones is fascinating and relevant for
many reasons. An understanding of the cues is only to provide valuable insight into how …