Ten years ago, two reviews clarified the need to tie glucocorticoid (GC) levels directly to
survival and reproductive measures. Three primary hypotheses emerged from that work: the …

Many sexually selected traits exhibit phenotypic plasticity. Despite a growing appreciation
for the ecological context in which sexual selection occurs, and for the role of plasticity in …

Artificial light at night (ALAN) can disrupt adaptive patterns of physiology and behavior that
promote high fitness, resulting in physiological stress and elevation of steroid …

Colorful ornaments are important visual signals for animal communication that can provide
critical information about the quality of the signaler. In this study, we focused on different …

The hypothalamic–pituitaryadrenal (HPA) axis is one of the most important physiological
mechanisms for mediating life-history trade-offs by reallocating resources to immediate …

The plight of wild birds is becoming critical due to exposure to environmental contaminants.
Although laboratory studies have provided insights into the developmental effects of …

Whole-organism metabolism is an integrative process that determines not only the energy
cost of living but also the energy output that is available for behavioral and physiological …

Sexually and socially selected signals are predicated to express the present and past
condition of individuals and thereby their capacity to cope with environmental challenges …

Male signals may express the capacity to sustain environmental challenges. In some
migratory birds like the Pied Flycatcher Ficedula hypoleuca, plumage ornaments are molted …

Survival and reproduction are the metrics of evolutionary success. However, the strategies
by which an individual makes a living, attracts a mate, and produces offspring can vary …