Corticosterone, testosterone and life-history strategies of birds

Hau, Michaela; Rickfels, Robert E.; Wikelski, Martin; Lee, Kelly A.; Brawn, Jeffrey D.

Corticosterone, testosterone and life-history strategies of birds

Dateien

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Datum

2010

Autor:innen

Hau, Michaela

Rickfels, Robert E.

Wikelski, Martin

Lee, Kelly A.

Brawn, Jeffrey D.

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Proceedings of the Royal Society B: Biological Sciences. 2010, 277(1697), pp. 3203-3212. ISSN 0962-8452. eISSN 1471-2954. Available under: doi: 10.1098/rspb.2010.0673

Zusammenfassung

Steroid hormones have similar functions across vertebrates, but circulating concentrations can vary dramatically among species. We examined the hypothesis that variation in titres of corticosterone (Cort) and testosterone (T) is related to life-history traits of avian species. We predicted that Cort would reach higher levels under stress in species with higher annual adult survival rates since Cort is thought to promote physiological and behavioural responses that reduce risk to the individual. Conversely, we predicted that peak T during the breeding season would be higher in short-lived species with high mating effort as this hormone is known to promote male fecundity traits. We quantified circulating hormone concentrations and key life-history traits (annual adult survival rate, breeding season length, body mass) in males of free-living bird species during the breeding season at a temperate site (northern USA) and a tropical site (central Panama). We analysed our original data by themselves, and also combined with published data on passerine birds to enhance sample size. In both approaches, variation in baseline Cort (Cort0) among species was inversely related to breeding season length and body mass. Stress-induced corticosterone (MaxCort) also varied inversely with body mass and, as predicted, also varied positively with annual adult survival rates. Furthermore, species from drier and colder environments exhibited lower MaxCort than mesic and tropical species; T was lowest in species from tropical environments. These findings suggest that Cort0, MaxCort and T modulate key vertebrate life-history responses to the environment, with Cort0 supporting energetically demanding processes, MaxCort promoting survival and T being related to mating success.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Zitieren

ISO 690

HAU, Michaela, Robert E. RICKFELS, Martin WIKELSKI, Kelly A. LEE, Jeffrey D. BRAWN, 2010. Corticosterone, testosterone and life-history strategies of birds. In: Proceedings of the Royal Society B: Biological Sciences. 2010, 277(1697), pp. 3203-3212. ISSN 0962-8452. eISSN 1471-2954. Available under: doi: 10.1098/rspb.2010.0673

BibTex

@article{Hau2010-10-22Corti-432,
  year={2010},
  doi={10.1098/rspb.2010.0673},
  title={Corticosterone, testosterone and life-history strategies of birds},
  number={1697},
  volume={277},
  issn={0962-8452},
  journal={Proceedings of the Royal Society B: Biological Sciences},
  pages={3203--3212},
  author={Hau, Michaela and Rickfels, Robert E. and Wikelski, Martin and Lee, Kelly A. and Brawn, Jeffrey D.}
}

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    <dcterms:abstract xml:lang="eng">Steroid hormones have similar functions across vertebrates, but circulating concentrations can vary dramatically among species. We examined the hypothesis that variation in titres of corticosterone (Cort) and testosterone (T) is related to life-history traits of avian species. We predicted that Cort would reach higher levels under stress in species with higher annual adult survival rates since Cort is thought to promote physiological and behavioural responses that reduce risk to the individual. Conversely, we predicted that peak T during the breeding season would be higher in short-lived species with high mating effort as this hormone is known to promote male fecundity traits. We quantified circulating hormone concentrations and key life-history traits (annual adult survival rate, breeding season length, body mass) in males of free-living bird species during the breeding season at a temperate site (northern USA) and a tropical site (central Panama). We analysed our original data by themselves, and also combined with published data on passerine birds to enhance sample size. In both approaches, variation in baseline Cort (Cort0) among species was inversely related to breeding season length and body mass. Stress-induced corticosterone (MaxCort) also varied inversely with body mass and, as predicted, also varied positively with annual adult survival rates. Furthermore, species from drier and colder environments exhibited lower MaxCort than mesic and tropical species; T was lowest in species from tropical environments. These findings suggest that Cort0, MaxCort and T modulate key vertebrate life-history responses to the environment, with Cort0 supporting energetically demanding processes, MaxCort promoting survival and T being related to mating success.</dcterms:abstract>
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Universitätsbibliographie

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