This paper traces the development of our understanding of the development of different
approaches to estimating the strength of reproductive competition and sexual selection in …

It is well known that sexual selection can target reproductive traits during successive pre‐
and post‐mating episodes of selection. A key focus of recent studies has been to understand …

We investigated the signaling function of blue plumage in male blue grosbeaks (Guiraca
caerulea) to determine if structurally based coloration may act as a reliable signal of quality …

Extrapair paternity has been suggested to represent a potentially important source of sexual
selection on male secondary sexual characters, particularly in birds with predominantly …

Species with paternal care show less exaggerated sexual ornamentation than those in
which males do not care, although direct benefits from paternal care can vastly exceed the …

Polyandry, by elevating sexual conflict and selecting for reduced male care relative to
monandry, may exacerbate the cost of sex and thereby seriously impact population fitness …

Organisms are expected to adjust the sex ratio of their offspring in relation to the relative
fitness benefits of sons and daughters. We used a molecular sexing technique that amplifies …

Comparative analyses suggest that a variety of ecological and behavioural factors contribute
to the tremendous variability in extrapair mating among birds. In an analysis of 1010 species …

In many species, females mate with multiple partners, meaning that sexual selection on
male traits operates across a spectrum that encompasses the competition for mates (that is …

Alternative mating strategies are common in nature and are generally thought to increase
the intensity of sexual selection. However, cuckoldry can theoretically decrease the …