The lifespan of spermatozoa from externally fertilizing freshwater fish ranges from a few
seconds to several minutes, depending on the species. External factors, such as …

Factors such as gamete quality can profoundly affect fertility, but the spawning micro-
environment that surrounds the spermatozoa and eggs during gamete contact has largely …

'Sperm competition'—where ejaculates from two or more males compete for fertilization—
and 'cryptic female choice'—where females bias this contest to suit their reproductive …

Sperm function generally declines with male age. Paradoxically, females of many species
still choose to mate with old males rather than young males. Females choosing old mates …

In this study, we investigated two potentially important intersexual postcopulatory gametic
interactions in a population of chinook salmon (Oncorhynchus tshawytscha):(i) the effect of …

In polyandrous mating systems, females maintain the opportunity to bias male fertilization
success after mating in a process known as cryptic female choice. Mechanisms of cryptic …

Models of ageing predict that sperm function and fertility should decline with age as sperm
are exposed to free radical damage and mutation accumulation. However, theory also …

In many species, males can make rapid adjustments to ejaculate performance in response
to sperm competition risk; however, the mechanisms behind these changes are not …

Studying mate choice at the gamete level can provide valuable insights into proximate
mechanisms that underlie the evolution of mating systems. The objective was to assess …

Alternative reproductive tactics (ARTs) are prevalent in nature, where smaller parasitic
males typically have better sperm quality than larger territorial guard males. At present, it is …