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 …

Sperm experience intense and varied selection that dramatically impacts the evolution of
sperm quality. Selection acts to ensure that sperm are fertilization-competent and able to …

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 …

Evolutionary biologists have endeavoured to explain the extraordinary diversity of sperm
morphology across animals for more than a century. One hypothesis to explain sperm …

Sperm competition, in which the ejaculates of multiple males compete to fertilize a female's
ova, results in strong selection on sperm traits. Although sperm size and swimming velocity …

Many marine invertebrate taxa are broadcast spawners, where multiple individuals release
their gametes into the water for external fertilization, often in the presence of gametes from …

Environmental change frequently drives morphological diversification, including at the
cellular level. Transitions in the environment where fertilization occurs (ie, fertilization mode) …

Splice variants of mRNA encoding the LH receptor (LHR) during follicular development were
characterized in cyclic and non-cyclic ewes. Granulosa and theca cells were collected from …

Despite the diverse array of mating systems and life histories which characterise the
parasitic Hymenoptera, sexual selection and sexual conflict in this taxon have been …

The spermatozoon is the most diverse cell type known and this diversity is considered to
reflect differences in sperm function. How the diversity in sperm morphology arose during …