Postcopulatory sexual selection through sperm competition may be an important
evolutionary force affecting many reproductive traits, including sperm morphometrics …

Sex allocation research in mammals has focussed almost exclusively on mothers under the
assumption that the male contribution is genetically determined during meiosis and …

Effects of vertebrate-associated microbiota on physiology and health are of significant
interest in current biological research. Most previous studies have focused on host …

Rapid diversification of sexual traits is frequently attributed to sexual selection, though
explicit tests of this hypothesis remain limited. Spermatozoa exhibit remarkable variability in …

Background Female promiscuity is highly variable among birds, and particularly among
songbirds. Comparative work has identified several patterns of covariation with social …

It is the differences between sperm and eggs that fundamentally underpin the differences
between the sexes within reproduction. For males, it is theorized that widespread sperm …

There is substantial comparative and growing experimental evidence that the competition for
fertilization among sperm from different males can drive variation in male reproductive …

Traditionally, it has been assumed that sperm are a vehicle for genes and nothing more. As
such, the only source of variance in offspring phenotype via the paternal line has been …

A common challenge in phylogenetic reconstruction is to find enough suitable genomic
markers to reliably trace splitting events with short internodes. Here, we present …

Passerine birds show large interspecific variation in extrapair paternity rates. There is
accumulating evidence that such promiscuous behavior is driven by indirect, genetic …