Baseline and stress-induced levels of corticosterone in male and female Afrotropical and European temperate stonechats during breeding

BMC Evolutionary Biology
Beate ApfelbeckNeil P Evans

Abstract

Latitudinal variation in avian life histories falls along a slow-fast pace of life continuum: tropical species produce small clutches, but have a high survival probability, while in temperate species the opposite pattern is found. This study investigated whether differential investment into reproduction and survival of tropical and temperate species is paralleled by differences in the secretion of the vertebrate hormone corticosterone (CORT). Depending on circulating concentrations, CORT can both act as a metabolic (low to medium levels) and a stress hormone (high levels) and, thereby, influence reproductive decisions. Baseline and stress-induced CORT was measured across sequential stages of the breeding season in males and females of closely related taxa of stonechats (Saxicola spp) from a wide distribution area. We compared stonechats from 13 sites, representing Canary Islands, European temperate and East African tropical areas. Stonechats are highly seasonal breeders at all these sites, but vary between tropical and temperate regions with regard to reproductive investment and presumably also survival. In accordance with life-history theory, during parental stages, post-capture (baseline) CORT was overall lower in tropical th...Continue Reading

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Citations

Jan 27, 2019·Ecology and Evolution·Beate ApfelbeckBarbara Helm
Jun 4, 2018·Integrative and Comparative Biology·Stefania CasagrandeMichaela Hau

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