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Inbreeding in the seychelles warbler: Environment-dependent maternal effects

Richardson, David LU ; Komdeur, J and Burke, T (2004) In Evolution 58(9). p.2037-2048
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
inbreeding depression, inbreeding avoidance, environmental variation, heterozygosity, maternal effects, microsatellites, survival
in
Evolution
volume
58
issue
9
pages
2037 - 2048
publisher
Wiley-Blackwell
external identifiers
  • pmid:15521460
  • wos:000224339500013
  • scopus:5344233457
ISSN
1558-5646
DOI
10.1111/j.0014-3820.2004.tb00488.x
language
English
LU publication?
yes
id
9444f2c9-cd5f-4155-a76d-b62fd71b6098 (old id 264339)
date added to LUP
2007-10-30 15:56:49
date last changed
2017-12-10 04:30:31
@article{9444f2c9-cd5f-4155-a76d-b62fd71b6098,
  abstract     = {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.},
  author       = {Richardson, David and Komdeur, J and Burke, T},
  issn         = {1558-5646},
  keyword      = {inbreeding depression,inbreeding avoidance,environmental variation,heterozygosity,maternal effects,microsatellites,survival},
  language     = {eng},
  number       = {9},
  pages        = {2037--2048},
  publisher    = {Wiley-Blackwell},
  series       = {Evolution},
  title        = {Inbreeding in the seychelles warbler: Environment-dependent maternal effects},
  url          = {http://dx.doi.org/10.1111/j.0014-3820.2004.tb00488.x},
  volume       = {58},
  year         = {2004},
}