Latitudinal distribution, migration, and testosterone levels in birds

L. Z. Garamszegi, K. Hirschenhauser, V. Bókony, M. Eens, S. Hurtrez-Boussès, A. P. Møller, R. F. Oliveira, J. C. Wingfield

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Tropical bird species usually have lower testosterone (T) levels during breeding than temperate species. However, the potential mechanisms behind the positive interspecific correlation between T and latitude remain unexplored. In a comparative study of more than 100 bird species, we examined whether social constraints during male-male competition arising from migration and breeding synchrony are responsible for the latitude effects. Species that breed at higher latitudes are more likely to migrate and experience more intense intrasexual competition upon spring arrival than nonmigrant species from lower latitudes. Additionally, species from higher latitudes cope with shorter breeding seasons and thus with more synchronous breeding, which selects for high T titers via increased male-male conflicts. Accordingly, peak T levels were associated with migration and the duration of the egg laying period that reflects breeding synchrony. Because migration and breeding synchrony were related to latitudinal distribution, they appear to be important components of the latitude effects on T. A multivariate model controlling for covariation of predictor variables revealed that latitude remained the strongest predictor of peak T. Therefore, selection due to migration and breeding synchrony may partially cause the latitude effect, but other geographically varying factors may also play a role in mediating peak T levels at different latitudes.

Original languageEnglish
Pages (from-to)533-546
Number of pages14
JournalAmerican Naturalist
Volume172
Issue number4
DOIs
Publication statusPublished - Oct 2008

Keywords

  • Aggression
  • Androgens
  • Evolution
  • Phylogeny
  • Steroid hormones
  • Territorial conflicts

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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  • Cite this

    Garamszegi, L. Z., Hirschenhauser, K., Bókony, V., Eens, M., Hurtrez-Boussès, S., Møller, A. P., Oliveira, R. F., & Wingfield, J. C. (2008). Latitudinal distribution, migration, and testosterone levels in birds. American Naturalist, 172(4), 533-546. https://doi.org/10.1086/590955