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Full-Text Articles in Ornithology
Female Presence Does Not Increase Testosterone But Still Ameliorates Sickness Behaviours In Male Japanese Quail, Brenna M. G. Gormally, Kaelyn Bridgette, Aubrey Emmi, Delilah Schuerman, Patricia C. Lopes
Female Presence Does Not Increase Testosterone But Still Ameliorates Sickness Behaviours In Male Japanese Quail, Brenna M. G. Gormally, Kaelyn Bridgette, Aubrey Emmi, Delilah Schuerman, Patricia C. Lopes
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Infections can dramatically modify animal behaviour. The extent of these changes depends on an animal's environment. It has been proposed that testosterone modulates the suppression of behavioural symptoms of sickness under certain reproductive contexts. To further understand the role played by testosterone in modulating sickness behaviours under reproductive contexts, we studied a species, the Japanese quail, in which female exposure rapidly decreases circulating testosterone in males. Males received either an immune challenge (lipopolysaccharide – LPS) or a control injection and their behaviours, mass change and testosterone levels were quantified in the presence or absence of a female. Both the presence …
Common Loons Respond Adaptively To A Black Fly That Reduces Nesting Success, Walter H. Piper, Keren B. Tischler, Andrew Reinke
Common Loons Respond Adaptively To A Black Fly That Reduces Nesting Success, Walter H. Piper, Keren B. Tischler, Andrew Reinke
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Nesting birds must often cope with harassment from biting insects, but it is difficult to ascertain what effect such pests might have on breeding success and population dynamics. We tested the hypothesis that a black fly (Simulium annulus) that feeds on the blood of nesting Common Loons (Gavia immer) causes nest abandonment in this charismatic diving bird. In addition, we measured effects of fly-induced abandonment on a loon population, and examined potential predictors of fly abundance and nest abandonment. We also tested a second hypothesis, which holds that loon pairs that abandon a nest owing to …