Phenotypic integration of sexually selected traits in a songbird

摘要: xv testosterone in response to an injection of GnRH, a hypothalamic hormone. This suggests that investment mating behavior (which seems be controlled by testosterone) may covary with attractiveness. Indeed, Chapter 4, I found androgen responsiveness naturally covaries both and parental behavior. Males produced more defended their territories vigorously fed offspring less often. Finally, 5, examined how selection acts on responsiveness, males very high or low were likely survive. Combined, these studies suggest testosterone, physiological level, correlational selection, evolutionary act as integrators the male phenotype.