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Indirect fitness benefits through extra‐pair mating are large for an inbred minority, but cannot explain widespread infidelity among red‐winged fairy‐wrens

Lichtenauer, Wendy; van de Pol, Martijn; Cockburn, Andrew; Brouwer, Lyanne

Description

Extra‐pair paternity (EPP) has been suggested to improve the genetic quality of offspring, but evidence has been equivocal. Benefits of EPP may be only available to specific individuals or under certain conditions. Red‐winged fairy‐wrens have extremely high levels of EPP, suggesting fitness benefits might be large and available to most individuals. Furthermore, extreme philopatry commonly leads to incestuous social pairings, so inbreeding avoidance may be an important selection pressure. Here,...[Show more]

dc.contributor.authorLichtenauer, Wendy
dc.contributor.authorvan de Pol, Martijn
dc.contributor.authorCockburn, Andrew
dc.contributor.authorBrouwer, Lyanne
dc.date.accessioned2020-05-11T05:31:21Z
dc.date.available2020-05-11T05:31:21Z
dc.identifier.issn0014-3820
dc.identifier.urihttp://hdl.handle.net/1885/204003
dc.description.abstractExtra‐pair paternity (EPP) has been suggested to improve the genetic quality of offspring, but evidence has been equivocal. Benefits of EPP may be only available to specific individuals or under certain conditions. Red‐winged fairy‐wrens have extremely high levels of EPP, suggesting fitness benefits might be large and available to most individuals. Furthermore, extreme philopatry commonly leads to incestuous social pairings, so inbreeding avoidance may be an important selection pressure. Here, we quantified the fitness benefits of EPP under varying conditions and across life‐stages. Extra‐pair offspring (EPO) did not appear to have higher fitness than within‐pair offspring (WPO), neither in poor years nor in the absence of helpers‐at‐the‐nest. However, EPP was beneficial for closely related social pairs, because inbred WPO suffered an overall 75% reduction in fitness. Inbreeding depression was nonlinear and reduced nestling body condition, first year survival and reproductive success. Our comprehensive study indicates that EPP should be favored for the 17% of females paired incestuously, but cannot explain the widespread infidelity in this species. Furthermore, our finding that fitness benefits of EPP only become apparent for a small part of the population could potentially explain the apparent absence of fitness differences in population wide comparisons of EPO and WPO.
dc.description.sponsorshipThe work was supported by a Rubicon fellowship of the Netherlands Organisation for Scientific Research (NWO825.08.003) awarded to LB, and by fellowships and grants from the Australian Research Council awarded to LB (DE130100174), AC (DP0451018, DP1092565) and MP (FT120100204).
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherSociety for the Study of Evolution
dc.rights© 2019 The Author(s).
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.sourceEvolution
dc.subjectCompatible genes
dc.subjectcooperative breeding
dc.subjectfitness
dc.subjectgood genes
dc.subjectinbreeding avoidance
dc.subjectMalurus
dc.subjectpairwise relatedness
dc.titleIndirect fitness benefits through extra‐pair mating are large for an inbred minority, but cannot explain widespread infidelity among red‐winged fairy‐wrens
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume73
dcterms.dateAccepted2019-01-03
dc.date.issued2019-01-22
local.identifier.absfor060201 - Behavioural Ecology
local.identifier.ariespublicationu9511635xPUB1902
local.publisher.urlhttps://onlinelibrary.wiley.com/
local.type.statusPublished Version
local.contributor.affiliationLichtenauer, Wendy, College of Science, ANU
local.contributor.affiliationvan de Pol, Martijn, College of Science, ANU
local.contributor.affiliationCockburn, Andrew, College of Science, ANU
local.contributor.affiliationBrouwer, Lyanne, College of Science, ANU
dc.relationhttp://purl.org/au-research/grants/arc/DE130100174
dc.relationhttp://purl.org/au-research/grants/arc/DP0451018
dc.relationhttp://purl.org/au-research/grants/arc/DP1092565
dc.relationhttp://purl.org/au-research/grants/arc/FT120100204
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage467
local.bibliographicCitation.lastpage480
local.identifier.doi10.1111/evo.13684
local.identifier.absseo970106 - Expanding Knowledge in the Biological Sciences
dc.date.updated2020-03-08T07:23:57Z
local.identifier.scopusID2-s2.0-85061260252
dcterms.accessRightsOpen Access
dc.provenanceThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
dc.rights.licenseCreative Commons Attribution License
CollectionsANU Research Publications

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