The effects of sex hormones on immune function have received much attention, especially
following the proposal of the immunocompetence handicap hypothesis. Many studies, both …

The immunocompetence handicap hypothesis was formulated 12 years ago in an attempt to
offer a proximate mechanism by which female choice of males could be explained by …

The book aims to integrate our understanding of mammalian societies into a novel synthesis
that is relevant to behavioural ecologists, ecologists, and anthropologists. It adopts a …

Behavioral Ecology of Tropical Birds, Second Edition provides the most updated and
comprehensive review on the evolution of behavior in tropical landbirds. The book reviews …

There has been considerable recent interest in the effects of life-history decisions on
immunocompetence in birds. If immunocompetence is limited by available resources, then …

Costs of sexual traits are of central importance to the theory of sexual selection. To qualify as
a cost in line with theoretical models, empirical studies must demonstrate that sexual traits …

Traits correlated with male mating success are likely to be subject to sexual selection.
Sexually selected characters are thought to be costly to develop and maintain. If males do …

1. Recently, there has been much interest in physiological trade‐offs between parasite
resistance and fitness‐related traits such as secondary sexual characters or reproductive …

Avian malaria parasites are supposed to exert negative effects on host fitness because
these intracellular parasites affect host metabolism. Recent advances in molecular …

Immune defences are undoubtedly of great benefit to the host, reducing the impact of
infectious organisms. However, mounting immune responses also entails costs, which may …