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 …

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

Spermatozoa vary enormously in their form and dimensions, both between and within
species, yet how this variation translates into fertilizing efficiency is not known. Sperm …

Publisher Summary Sperm competition is the competition between the ejaculates of different
males for the fertilization of a given set of ova. Charles Darwin (1871) proposed sexual …

Background The influence of sperm competition upon sperm size has been a controversial
issue during the last 20 years which remains unresolved for mammals. The hypothesis that …

The study was to focus on the relationship between wave motion (mass sperm motility,
measured by a mass sperm motility score, manually assessed by artificial insemination (AI) …

Sperm velocity is one of the main determinants of the outcome of sperm competition. Since
sperm vary considerably in their morphology between and within species, it seems likely that …

Sperm competition, the contest among ejaculates from rival males to fertilize ova of a female,
is a common and powerful evolutionary force influencing ejaculate traits. During competitive …

While both sperm number and quality are now recognized to be important in determining the
outcome of sperm competition, very few studies have experimentally assessed the influence …

Sperm competition is now recognised as a potent selective force shaping many male
reproductive traits. While the influence of sperm competition on sperm number is widely …