The negative co‐variation of life‐history traits such as fecundity and lifespan across species
suggests the existence of ubiquitous trade‐offs. Mechanistically, trade‐offs result from the …

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

Literature Cited to accompany Animal Communication, 2e Page 1 Principles of Animal
Communication, Second Edition Jack W. Bradbury and Sandra L. Vehrencamp Chapter 14 …

Many human behaviors, from mating to food acquisition and aggressiveness, entail some
degree of risk. Testosterone, a steroid hormone, has been implicated in a wide range of …

Among vertebrates, fish show by far the greatest variability of alternative reproductive tactics
(ARTs). Usually, males attempting to monopolize access to females or fertilizations are …

Steroid hormones have similar functions across vertebrates, but circulating concentrations
can vary dramatically among species. We examined the hypothesis that variation in titres of …

In social species animals should fine-tune the expression of their social behavior to social
environments in order to avoid the costs of engaging in costly social interactions. Therefore …

Androgen levels show strong patterns throughout the year in male vertebrates and play an
important role in the seasonal modulation of the frequency, intensity and persistence of …

Consistent individual differences in hormone levels and metabolic rates have been
proposed to be potential state variables underlying consistent individual differences in …

In many animal species including humans circulating androgen levels in males respond to
social challenges. This response has been interpreted as an adaptive mechanism that helps …