Hormonal responses to male-male social challenge in the blue tit Cyanistes caeruleus: single-broodedness as an explanatory variable.

@article{Landys2007HormonalRT,
  title={Hormonal responses to male-male social challenge in the blue tit Cyanistes caeruleus: single-broodedness as an explanatory variable.},
  author={Mėta M. Landys and Wolfgang Goymann and Michael Raess and Tore Slagsvold},
  journal={Physiological and biochemical zoology : PBZ},
  year={2007},
  volume={80 2},
  pages={228-40}
}
The "challenge hypothesis" posits that when established social orders are challenged, plasma testosterone (T) in socially monogamous breeding male birds will temporarily increase to facilitate aggressive responses. However, not all birds conform to predictions. To expand upon past findings, we examined effects of direct territorial challenge on T levels in the blue tit (Cyanistes caeruleus). We found that simulated territorial intrusions caused a decline in plasma T during both territory… CONTINUE READING
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