Changes in body mass and hormone levels between wintering and spring staging areas in dark-bellied brent geese Branta bernicla bernicla

M. Poisbleau, H. Fritz, M.M. Lambrechts, C. Trouvé, B.S. Ebbinge

Research output: Contribution to journalLetterAcademicpeer-review

3 Citations (Scopus)

Abstract

We document seasonal changes in body mass and plasma hormone levels (testosterone and triiodothyronine) between winter and spring quarters in dark-bellied brent geese Branta bernicla bernicla. Body mass increased between winter and spring, whereas body size was the same for the birds sampled in winter and those in spring. Adults and males were larger and heavier than juveniles and females. Plasma testosterone levels did not differ significantly between winter and spring, and did not vary with sex, age and morphometry. Plasma triiodothyronine (T3) levels were significantly higher in spring than in winter, and were higher for males than for females. However, T3 levels did not vary significantly with age and body measurements. To explain the findings, we discuss potential impacts of social dominance
Original languageEnglish
Pages (from-to)143-148
JournalJournal of Avian Biology
Volume37
Issue number2
DOIs
Publication statusPublished - 2006

Keywords

  • challenge hypothesis
  • thyroid-hormone
  • social inertia
  • annual cycle
  • anser-anser
  • testosterone
  • reproduction
  • reserves
  • aggression
  • endocrine

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