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Do Seasonal Glucocorticoid Changes Depend on Reproductive Investment? A Comparative Approach in Birds.
Casagrande, Stefania; Zsolt Garamszegi, László; Goymann, Wolfgang; Donald, Jeremy; Francis, Clinton D; Fuxjager, Matthew J; Husak, Jerry F; Johnson, Michele A; Kircher, Bonnie; Knapp, Rosemary; Martin, Lynn B; Miller, Eliot T; Schoenle, Laura A; Vitousek, Maren N; Williams, Tony D; Hau, Michaela.
Afiliación
  • Casagrande S; Max Planck Institute for Ornithology, Eberhard-Gwinner-Straße, Seewiesen 82319, Germany.
  • Zsolt Garamszegi L; Department of Evolutionary Ecology, Estación Biológica de Doñana-CSIC, c/Americo Vespucio 26, Seville 41092, Spain.
  • Goymann W; MTA-ELTE Theoretical Biology and Evolutionary Ecology Research Group, Department of Plant Systematics, Ecology and Theoretical Biology, Eötvös Loránd University, 1117 Budapest, Hungary.
  • Donald J; Max Planck Institute for Ornithology, Eberhard-Gwinner-Straße, Seewiesen 82319, Germany.
  • Francis CD; Coates Library, Trinity University, San Antonio, TX 78212, USA.
  • Fuxjager MJ; Biological Sciences Department, California Polytechnic State University, San Luis Obispo, CA 93407, USA.
  • Husak JF; Department of Biology, Wake Forest University, Winston-Salem, NC 27109, USA.
  • Johnson MA; Department of Biology, University of St. Thomas, St. Paul, MN 55105, USA.
  • Kircher B; Department of Biology, Trinity University, San Antonio, TX 78212, USA.
  • Knapp R; Department of Biology, University of Florida, Gainesville, FL32608, USA.
  • Martin LB; Department of Biology, University of Oklahoma, Norman, OK 73019, USA.
  • Miller ET; Department of Global Health, University of South Florida, Tampa, FL 33620, USA.
  • Schoenle LA; Cornell Lab of Ornithology, Ithaca, NY 14850, USA.
  • Vitousek MN; Department of Global Health, University of South Florida, Tampa, FL 33620, USA.
  • Williams TD; Department of Biology, Hamilton College, Clinton, NY 13323, USA.
  • Hau M; Cornell Lab of Ornithology, Ithaca, NY 14850, USA.
Integr Comp Biol ; 58(4): 739-750, 2018 10 01.
Article en En | MEDLINE | ID: mdl-29860499
ABSTRACT
Animals go through different life history stages such as reproduction, moult, or migration, of which some are more energy-demanding than others. Baseline concentrations of glucocorticoid hormones increase during moderate, predictable challenges and thus are expected to be higher when seasonal energy demands increase, such as during reproduction. By contrast, stress-induced glucocorticoids prioritize a survival mode that includes reproductive inhibition. Thus, many species down-regulate stress-induced glucocorticoid concentrations during the breeding season. Interspecific variation in glucocorticoid levels during reproduction has been successfully mapped onto reproductive investment, with species investing strongly in current reproduction (fast pace of life) showing higher baseline and lower stress-induced glucocorticoid concentrations than species that prioritize future reproduction over current attempts (slow pace of life). Here we test the "glucocorticoid seasonal plasticity hypothesis", in which we propose that interspecific variation in seasonal changes in glucocorticoid concentrations from the non-breeding to the breeding season will be related to the degree of reproductive investment (and thus pace of life). We extracted population means for baseline (for 54 species) and stress-induced glucocorticoids (for 32 species) for the breeding and the non-breeding seasons from the database "HormoneBase", also calculating seasonal glucocorticoid changes. We focused on birds because this group offered the largest sample size. Using phylogenetic comparative methods, we first showed that species differed consistently in both average glucocorticoid concentrations and their changes between the two seasons, while controlling for sex, latitude, and hemisphere. Second, as predicted seasonal changes in baseline glucocorticoids were explained by clutch size (our proxy for reproductive investment), with species laying larger clutches showing a greater increase during the breeding season-especially in passerine species. In contrast, changes in seasonal stress-induced levels were not explained by clutch size, but sample sizes were more limited. Our findings highlight that seasonal changes in baseline glucocorticoids are associated with a species' reproductive investment, representing an overlooked physiological trait that may underlie the pace of life.
Asunto(s)

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Filogenia / Reproducción / Aves / Glucocorticoides Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: Integr Comp Biol Año: 2018 Tipo del documento: Article País de afiliación: Alemania

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Filogenia / Reproducción / Aves / Glucocorticoides Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: Integr Comp Biol Año: 2018 Tipo del documento: Article País de afiliación: Alemania