Many ecosystems have experienced anthropogenically induced changes in biodiversity, yet
predicting these patterns has been difficult. Recently, individual behavioural and …

How hard do birds work during parental care, chick rearing, or provisioning of their
nestlings? And if birds do work hard, can we detect a physiological signature of individual …

Energy expenditure in wild animals can be limited (i) intrinsically by physiological processes
that constrain an animal's capacity to use energy,(ii) extrinsically by energy availability in the …

In nest-bound avian offspring, food shortages typically trigger a release of the stress
hormone corticosterone (CORT). Recent studies indicate that CORT is passively deposited …

Costs of reproduction are an integral and long-standing component of life-history theory, but
we still know relatively little about the specific physiological mechanisms underlying these …

Abstract We developed a Hidden Markov mark–recapture model (R package marked) to
examine sex‐specific demography in Magellanic Penguins (Spheniscus magellanicus). Our …

Life history theory posits that reproduction is constrained by a cost of reproduction such that
any increase in breeding effort should reduce subsequent survival. Oxidative stress refers to …

Biologging devices are providing detailed insights into the behaviour and movement of
animals in their natural environments. It is usually assumed that this method of gathering …

Biased offspring sex ratio is relatively rare in birds and sex allocation can vary with
environmental conditions, with the larger and more costly sex, which can be either the male …

Seabirds care for their offspring in remote breeding colonies where foraging sites are distant
and may be unpredictable, and where chicks are left unaccompanied for extended periods …