Testosterone in tropical birds: effects of environmental and social factors.

@article{Goymann2004TestosteroneIT,
  title={Testosterone in tropical birds: effects of environmental and social factors.},
  author={Wolfgang Goymann and Ignacio Tom{\'a}s Moore and Alexander Scheuerlein and Katharina Hirschenhauser and Alan Grafen and John C Wingfield},
  journal={The American naturalist},
  year={2004},
  volume={164 3},
  pages={327-34}
}
Previous investigations suggest that male tropical birds have lower plasma testosterone concentrations than northern latitude species. To test whether this generalization is valid, we analyzed all currently available plasma testosterone data of tropical birds. We focused on peak breeding testosterone levels using phylogenetic and conventional statistics. Explanatory variables considered were social mating system, type of territoriality, breeding season length, and altitude. On average, tropical… CONTINUE READING

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