Theory suggests that male fitness generally increases steadily with mating rate, while one or
a few matings are sufficient for females to maximize their reproductive success. Contrary to …

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 …

Methods of risk assessment for alien species, especially for nonagricultural systems, are
largely qualitative. Using a generalizable risk assessment approach and statistical models of …

The outcome of sperm competition is mediated largely by the relative numbers of sperm from
competing males. However, substantial variation in features of sperm morphology and …

Nuptial feeding encompasses any form of nutrient transfer from the male to the female
during or directly after courtship and/or copulation. In insects, nuptial gifts may take the form …

Publisher Summary This chapter reviews the current knowledge of variation in sperm
morphology over several levels of biological organization: variation within males (both within …

Rapid evolution of reproductive traits has been attributed to sexual selection arising from
interaction between the sexes. However, little is known about the nature of selection driving …

Females of all species belonging to the family Drosophilidae have two kinds of sperm‐
storage organs: paired spherical spermathecae and a single elongate tubular seminal …

We develop the logic of assessment of sperm competition risk by individual males where the
mechanism of sperm competition follows a 'loaded raffle'(first and second inseminates of a …

It has long been recognized that male mating competition is responsible for the evolution of
weaponry for mate acquisition. However, when females mate with more than one male …