High rates of infidelity in the Grey Fantail Rhipidura albiscapa suggest that testis size may be a better correlate of extra-pair paternity than sexual dimorphism

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dc.contributor.authorHoffman, Joseph I.
dc.contributor.authorMunro, Kat
dc.contributor.authorKilner, Rebecca
dc.contributor.authorAmos, W.
dc.date.accessioned2015-12-10T23:01:53Z
dc.date.issued2010
dc.date.updated2016-02-24T08:31:11Z
dc.description.abstractThe Grey Fantail Rhipidura albiscapa is a socially monogamous passerine endemic to Australia. Behavioural and morphological clues point to opposing conclusions as to its breeding system; sexual monomorphism and monochrome colorations suggest monogamy, whereas relatively large testes and a prominent cloacal protruberance are more indicative of multiple mating and sperm competition. We used five highly variable microsatellite loci to investigate the genetic breeding system of this species. Paternity was assigned to 49 of 69 (71%) offspring tested and the overall rate of partner infidelity was high, with 55% of offspring being sired by an extra-pair male and 64% of all clutches containing extra-pair young. This puts the Grey Fantail amongst the most promiscuous socially monogamous species yet studied. Where extra-pair fathers were identified, these were invariably in neighbouring territories, and although larger males did not gain more paternities overall, extra-pair offspring tended to be fathered by larger males than expected by chance. We interpret our findings in light of some of the potential costs and benefits associated with extra-pair paternity.
dc.identifier.issn0019-1019
dc.identifier.urihttp://hdl.handle.net/1885/61788
dc.publisherBritish Ornithologists Union
dc.sourceIbis
dc.subjectKeywords: behavioral ecology; clutch size; endemic species; functional morphology; genetic marker; mate choice; passerine; paternity; reproductive strategy; sexual dimorphism; sperm competition; Australia; Passeriformes; Rhipidura Mate choice; Microsatellite; Monogamy; Passerine; Testis size
dc.titleHigh rates of infidelity in the Grey Fantail Rhipidura albiscapa suggest that testis size may be a better correlate of extra-pair paternity than sexual dimorphism
dc.typeJournal article
local.bibliographicCitation.issue2
local.bibliographicCitation.lastpage385
local.bibliographicCitation.startpage378
local.contributor.affiliationHoffman, Joseph I., University of Cambridge
local.contributor.affiliationMunro, Kat, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationKilner, Rebecca, University of Cambridge
local.contributor.affiliationAmos, W., University of Cambridge
local.contributor.authoremailrepository.admin@anu.edu.au
local.contributor.authoruidMunro, Kat, a149336
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor060201 - Behavioural Ecology
local.identifier.absseo970106 - Expanding Knowledge in the Biological Sciences
local.identifier.ariespublicationf2965xPUB640
local.identifier.citationvolume152
local.identifier.doi10.1111/j.1474-919X.2009.01007.x
local.identifier.scopusID2-s2.0-77952498235
local.identifier.uidSubmittedByf2965
local.type.statusPublished Version

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