Social modulation of androgens in male birds.

  title={Social modulation of androgens in male birds.},
  author={Wolfgang Goymann},
  journal={General and comparative endocrinology},
  volume={163 1-2},
Most seasonally reproducing vertebrates show pronounced changes in testosterone levels throughout the year. The Challenge Hypothesis [Wingfield, J.C., Hegner, R.E., Dufty, A.M., Ball, G. F., 1990. The "challenge hypothesis": theoretical implications for patterns of testosterone secretion, mating systems, and breeding strategies. Am. Nat. 136, 829-846] predicts that seasonal patterns in circulating androgen concentrations vary as a function of mating system, male-male aggression and paternal… CONTINUE READING
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