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

Current theoretical and empirical findings suggest that mate preferences are mainly cued on
visual, vocal and chemical cues that reveal health including developmental health. Beautiful …

The function of bird song is closely linked to sexual selection. A fundamental question
regarding the evolution of sexually selected male signals is how their honesty is maintained …

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 …

1. Habitat structure has been considered as a main factor shaping the evolution of bird song
acoustics. 2. Based on expected differential patterns of sound degradation in different …

The Barn Swallow is a familiar and popular bird throughout the world. It is one of the most
widely distributed bird species, breeding in North America, Europe, Asia and North Africa …

This book presents evidence that infection is cyclical with the seasons, and that this
phenomenon is mirrored in cycles of immune function. The book identifies the mechanisms …

Parasite-mediated sexual selection may arise as a consequence of 1) females avoiding
mates with directly transmitted parasites, 2) females choosing less-parasitized males that …

One of the primary assumptions of the immunocompetence hypothesis is that testosterone is
immunosuppressive. Although many studies in birds and mammals have supported this …

Bird song, like many other male secondary sexual characters, may have evolved as intra-or
inter-sexual signals of male phenotypic quality. The hypotheses that song rate and song …