Same trait, different receiver response: unlike females, male American goldfinches do not signal status with bill colour

Title:
Same trait, different receiver response: unlike females, male American goldfinches do not signal status with bill colour
Authors:
Murphy, Troy G.; West, Joe A.; Pham, Tiffany T.; Cevallos, Lucy M.; Simpson, Richard K.; Tarvin, Keith A.
Abstract:
In species in which both sexes have similar ornamentation, the ornaments often function as sexual or social signals in both sexes. However, males and females may use ornaments in different signalling contexts. We previously demonstrated that carotenoid-based bill colour of female American goldfinches, Spinus tristis, functions as a signal of status during intrasexual, but not intersexual, competition. Here we test whether male bill colour functions as a competitive status signal during both intra- and intersexual contests. We tested whether focal males and females avoided feeding adjacent to taxidermic male models as a function of the models' experimentally altered bill colour. We additionally tested whether male bill colour functions as a mate choice signal by presenting females with a choice of two live males with experimentally altered bill colour. In the status signal experiment, neither focal males nor females avoided male models with more colourful bills, as was predicted by the status-signalling hypothesis. These results indicate that male bill coloration does not function as a signal of competitive status and that the signal function of male bill colour does not parallel that of female bill colour. In our mate choice experiment, females showed no preference for male bill colour, suggesting that male bill colour may have some yet untested signalling function or that male bill colour may no longer be under selection. Our findings suggest that selection can lead to different signalling strategies in males and females, even in species that express mutual ornamentation.
Citation:
Murphy, T.G., J.A. West, T.T. Pham, L.M. Cevallos, R.K. Simpson, and K.A. Tarvin. 2014. "Same trait, different receiver response: unlike females, male American goldfinches do not signal status with bill colour." Animal Behaviour 93: 121-127.
Publisher:
Elsevier Masson
DATE ISSUED:
2014-07
Department:
Biology
Type:
Article
PUBLISHED VERSION:
10.1016/j.anbehav.2014.04.034
PERMANENT LINK:
http://hdl.handle.net/11282/566792

Full metadata record

DC FieldValue Language
dc.contributor.authorMurphy, Troy G.en
dc.contributor.authorWest, Joe A.en
dc.contributor.authorPham, Tiffany T.en
dc.contributor.authorCevallos, Lucy M.en
dc.contributor.authorSimpson, Richard K.en
dc.contributor.authorTarvin, Keith A.en
dc.date.accessioned2015-08-13T10:34:13Zen
dc.date.available2015-08-13T10:34:13Zen
dc.date.issued2014-07en
dc.identifier.citationMurphy, T.G., J.A. West, T.T. Pham, L.M. Cevallos, R.K. Simpson, and K.A. Tarvin. 2014. "Same trait, different receiver response: unlike females, male American goldfinches do not signal status with bill colour." Animal Behaviour 93: 121-127.en
dc.identifier.issn0003-3472en
dc.identifier.urihttp://hdl.handle.net/11282/566792en
dc.description.abstractIn species in which both sexes have similar ornamentation, the ornaments often function as sexual or social signals in both sexes. However, males and females may use ornaments in different signalling contexts. We previously demonstrated that carotenoid-based bill colour of female American goldfinches, Spinus tristis, functions as a signal of status during intrasexual, but not intersexual, competition. Here we test whether male bill colour functions as a competitive status signal during both intra- and intersexual contests. We tested whether focal males and females avoided feeding adjacent to taxidermic male models as a function of the models' experimentally altered bill colour. We additionally tested whether male bill colour functions as a mate choice signal by presenting females with a choice of two live males with experimentally altered bill colour. In the status signal experiment, neither focal males nor females avoided male models with more colourful bills, as was predicted by the status-signalling hypothesis. These results indicate that male bill coloration does not function as a signal of competitive status and that the signal function of male bill colour does not parallel that of female bill colour. In our mate choice experiment, females showed no preference for male bill colour, suggesting that male bill colour may have some yet untested signalling function or that male bill colour may no longer be under selection. Our findings suggest that selection can lead to different signalling strategies in males and females, even in species that express mutual ornamentation.en
dc.language.isoen_USen
dc.publisherElsevier Massonen
dc.identifier.doi10.1016/j.anbehav.2014.04.034en
dc.subject.departmentBiologyen
dc.titleSame trait, different receiver response: unlike females, male American goldfinches do not signal status with bill colouren
dc.typeArticleen
dc.identifier.journalAnimal Behaviouren
dc.subject.keywordAmerican goldfinchen
dc.subject.keywordCarotenoid ornamentationen
dc.subject.keywordElaborate monomorphic ornamentationen
dc.subject.keywordGenetic correlationen
dc.subject.keywordSocial competitionen
dc.subject.keywordSpinus tristisen
dc.subject.keywordStatus signalen
dc.identifier.volume93en
dc.identifier.startpage121en
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