Inbreeding in Seychelles warbler: Environment-dependent maternal effects

Richardson, David S. ORCID:, Komdeur, Jan and Burke, Terry (2004) Inbreeding in Seychelles warbler: Environment-dependent maternal effects. Evolution, 58. pp. 2037-2048. ISSN 1558-5646

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The deleterious effects of inbreeding can be substantial in wild populations and mechanisms to avoid such matings have evolved in many organisms. In situations where social mate choice is restricted, extrapair paternity may be a strategy used by females to avoid inbreeding and increase offspring heterozygosity. In the cooperatively breeding Seychelles warbler, Acrocephalus sechellensis, neither social nor extrapair mate choice was used to avoid inbreeding facultatively, and close inbreeding occurred in approximately 5% of matings. However, a higher frequency of extra‐group paternity may be selected for in female subordinates because this did reduce the frequency of mating between close relatives. Inbreeding resulted in reduced individual heterozygosity, which, against expectation, had an almost significant (P= 0.052), positive effect on survival. Conversely, low heterozygosity in the genetic mother was linked to reduced offspring survival, and the magnitude of this intergenerational inbreeding depression effect was environment‐dependent. Because we controlled for genetic effects and most environmental effects (through the experimental cross‐fostering of nestlings), we conclude that the reduced survival was a result of maternal effects. Our results show that inbreeding can have complicated effects even within a genetic bottlenecked population where the “purging” of recessive alleles is expected to reduce the effects of inbreeding depression.

Item Type: Article
Faculty \ School: Faculty of Science > School of Biological Sciences
UEA Research Groups: Faculty of Science > Research Groups > Organisms and the Environment
Faculty of Science > Research Centres > Centre for Ecology, Evolution and Conservation
Depositing User: EPrints Services
Date Deposited: 01 Oct 2010 13:37
Last Modified: 16 May 2023 08:30
DOI: 10.1111/j.0014-3820.2004.tb00488.x

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