While corticosterone (CORT) is often suggested to be an important hormone regulating
processes necessary for avian migration, there has been no systematic assessment of …

Parasites are ubiquitous and can strongly affect their hosts through mechanisms such as
behavioural changes, increased energetic costs and/or immunomodulation. When parasites …

Glucocorticoid (GC) hormones are important phenotypic mediators across vertebrates, but
their circulating concentrations can vary markedly. Here we investigate macroevolutionary …

We often expect that investigations of the patterns, causes, and consequences of among-
individual variation in a trait of interest will reveal how selective pressures or ecological …

Hormones are central regulators of organismal function and flexibility that mediate a
diversity of phenotypic traits from early development through senescence. Yet despite these …

Chronically high blood glucose levels (hyperglycaemia) can compromise healthy ageing
and lifespan at the individual level. Elevated oxidative stress can play a central role in …

Endocrine systems act as key intermediaries between organisms and their environments.
This interaction leads to high variability in hormone levels, but we know little about the …

Females of some species are considered sex-role reversed, meaning that they face stronger
competition for mates compared to males. While much attention has been paid to behavioral …

Glucocorticoids (GCs) are stress hormones that can strongly influence physiology, behavior,
and an organism's ability to cope with environmental change. Despite their importance, and …

Corticosterone (CORT), the main glucocorticoid in birds, regulates physiological and
behavioral traits linked to predictable and unpredictable environmental fluctuations (ie …