Ectoparasites of house sparrows (Passer domesticus): an experimental test of the immunocompetence handicap hypothesis and a new model

@article{Poiani2000EctoparasitesOH,
  title={Ectoparasites of house sparrows (Passer domesticus): an experimental test of the immunocompetence handicap hypothesis and a new model},
  author={Aldo Poiani and Arthur R. Goldsmith and Matthew R. Evans},
  journal={Behavioral Ecology and Sociobiology},
  year={2000},
  volume={47},
  pages={230-242}
}
Abstract Conspicuous secondary sexual traits may have evolved as handicap-revealing signals or as badges of status. We present results of an experiment using males of the sexually dimorphic house sparrow (Passer domesticus), that support the idea that the male-specific bib can be both a handicap-revealing signal and a reliable badge indicating the physical condition of the bird. In a test of the immunocompetence handicap hypothesis, wild-caught adult male house sparrows were studied in… 

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Does testosterone determine dominance in the house sparrow Passer domesticus? An experimental test

Test of the relative importance of testosterone as opposed to bib size in determining dominance within a group of male house sparrows suggested that the breeding season dominance levels were largely determined by testosterone levels as well as b Bib size, whereas the post-breeding dominance Levels were determined by postbreeding testosterone titre and previous breeding season dominated level.
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