ABSTRACT A behavioral syndrome is a suite of correlated behaviors expressed either
within a given behavioral context (eg, correlations between foraging behaviors in different …

Behavior of wild vertebrate individuals can vary in response to environmental or social
factors. Such within-individual behavioral variation is often mediated by hormonal …

Hormones coordinate the co-expression of behavioral, physiological, and morphological
traits, giving rise to correlations among traits and organisms whose parts work well together …

Males generally exhibit reduced immune responses as well as increased intensity and
prevalence of infections compared to female conspecifics. Physiologically, these sex …

Although high testosterone (T) levels inhibit paternal behaviour in birds breeding in
temperate zones many paternal mammals have a very different breeding biology …

SYNOPSIS. An organism's phenotype results from an interaction of environment and
genotype. Sex steroids play a role in translating sexual genotype into phenotype. The focus …

The steroid hormone testosterone (T) plays a central role in the regulation of breeding in
males, because many physiological, morphological and behavioural traits related to …

Highlights•Testosterone (T) is thought to integrate phenotypes that work well
together.•However, it is not clear how such integration is generated within the organism.•T …

Investigations of the cellular and molecular mechanisms of physiology and behaviour have
generally avoided attempts to explain individual differences. The goal has rather been to …

Although secondary sexual adornments are widespread in male primates, few studies have
examined female choice for these characters. Mandrills (Mandrillus sphinx) present an …