For almost 40 years, studies of whole-organism performance have formed a cornerstone of
evolutionary physiology. Although its utility as a heuristic guide is beyond question, and we …

Population dynamics models have long assumed that populations are composed of a
restricted number of groups, where individuals in each group have identical demographic …

Selection has led to the evolution of a variety of different mating strategies, each adapted to
different competitive challenges. But what happens if the competitive challenges depend on …

Urban areas represent a spectrum that goes from being safe habitats for biodiversity (ie,
habitats more or equally preferred, without costs to fitness) to being ecological traps (ie …

Within the past several decades, resource trade‐offs have emerged as the commonly
accepted explanation for how carotenoid‐based coloration links to individual performance …

There are two reasons why researchers are interested in the phenotypic relationship
between the expression of male secondary sexual characters (SSCs) and 'ejaculate …

All animals experience performance trade-offs as they complete tasks such as capturing
prey, defending territories, acquiring mates, and escaping predators. Why then, is it so hard …

Body condition may predict individual fitness because those in better condition have more
resources to allocate towards improving their fitness. However, the hypothesis that condition …

Parasites are considered drivers of population regulation in some species; unfortunately the
research leading to this hypothesis has all been conducted on managed populations. Still …

Highlights•A key tenet of sexual selection theory is that ornaments and weapons are
costly.•We measured the costs of producing and carrying horns in a giant rhinoceros …