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

TitleEctoparasites of house sparrows (Passer domesticus): An experimental test of the immunocompetence handicap hypothesis and a new model
Authors
KeywordsImmunocompetence
Sexual selection
Steroid hormones
Ectoparasites
House sparrows
Issue Date2000
Citation
Behavioral Ecology and Sociobiology, 2000, v. 47, n. 4, p. 230-242 How to Cite?
AbstractConspicuous 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 captivity. Birds implanted with elevated doses of testosterone were more dominant, had higher circulating levels of both testosterone and corticosterone and they also harboured relatively larger ectoparasite loads. Higher parasite loads were also associated with individuals showing lower immunocompetence and larger changes in bib size. A new model for immunocompetence effects in sexual selection is introduced, integrating actions that the hypothalamopituitary axis exerts on gonads, adrenals and the thyroid gland. The 'integrated immunocompetence model' synthesizes both the 'handicap' (i.e. survival-decreasing) and 'badge of status' (i.e. survival-enhancing) models for evolution of secondary sexual traits.
Persistent Identifierhttp://hdl.handle.net/10722/230701
ISSN
2015 Impact Factor: 2.382
2015 SCImago Journal Rankings: 1.373

 

DC FieldValueLanguage
dc.contributor.authorPoiani, A.-
dc.contributor.authorGoldsmith, A. R.-
dc.contributor.authorEvans, M. R.-
dc.date.accessioned2016-09-01T06:06:35Z-
dc.date.available2016-09-01T06:06:35Z-
dc.date.issued2000-
dc.identifier.citationBehavioral Ecology and Sociobiology, 2000, v. 47, n. 4, p. 230-242-
dc.identifier.issn0340-5443-
dc.identifier.urihttp://hdl.handle.net/10722/230701-
dc.description.abstractConspicuous 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 captivity. Birds implanted with elevated doses of testosterone were more dominant, had higher circulating levels of both testosterone and corticosterone and they also harboured relatively larger ectoparasite loads. Higher parasite loads were also associated with individuals showing lower immunocompetence and larger changes in bib size. A new model for immunocompetence effects in sexual selection is introduced, integrating actions that the hypothalamopituitary axis exerts on gonads, adrenals and the thyroid gland. The 'integrated immunocompetence model' synthesizes both the 'handicap' (i.e. survival-decreasing) and 'badge of status' (i.e. survival-enhancing) models for evolution of secondary sexual traits.-
dc.languageeng-
dc.relation.ispartofBehavioral Ecology and Sociobiology-
dc.subjectImmunocompetence-
dc.subjectSexual selection-
dc.subjectSteroid hormones-
dc.subjectEctoparasites-
dc.subjectHouse sparrows-
dc.titleEctoparasites of house sparrows (Passer domesticus): An experimental test of the immunocompetence handicap hypothesis and a new model-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0034036951-
dc.identifier.volume47-
dc.identifier.issue4-
dc.identifier.spage230-
dc.identifier.epage242-

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