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Male-biased gene flow across an avian hybrid zone: evidence from mitochondrial and microsatellite DNA

Helbig, AJ; Salomon, M; Bensch, Staffan LU and Seibold, I (2001) In Journal of Evolutionary Biology 14(2). p.277-287
Abstract
Mating pattern and gene flow were studied in the contact zone between two morphologically very similar Chiffchaff taxa (Phylloscopus collybita, P. brehmii) in SW France and northern Spain. Mating was assortative in brehmii, but not in collybita. Mixed matings were strongly asymmetric (excess of callybita male x brehmii female pairs), but did produce viable offspring in some cases. Sequence divergence of the mitochondrial cytochrome b gene was 4.6%; Haplotypes segregated significantly with phenotype (only five 'mismatches' among 94 individuals), demonstrating that mitochondrial gene flow was very restricted. The estimated proportion of F-1 hybrids in the reproductive population was significantly lower than expected under a closed population... (More)
Mating pattern and gene flow were studied in the contact zone between two morphologically very similar Chiffchaff taxa (Phylloscopus collybita, P. brehmii) in SW France and northern Spain. Mating was assortative in brehmii, but not in collybita. Mixed matings were strongly asymmetric (excess of callybita male x brehmii female pairs), but did produce viable offspring in some cases. Sequence divergence of the mitochondrial cytochrome b gene was 4.6%; Haplotypes segregated significantly with phenotype (only five 'mismatches' among 94 individuals), demonstrating that mitochondrial gene flow was very restricted. The estimated proportion of F-1 hybrids in the reproductive population was significantly lower than expected under a closed population model, indicating strong selection against hybrids. Genetic typing of 101 individuals at four microsatellite loci also showed significant population differentiation, but nuclear gene flow was estimated to be 75 times higher than mitochondrial gene flow. This strong discrepancy is probably due to unisexual hybrid sterility (Haldane's rule). Thus, there is a strong, but incomplete, reproductive barrier between these taxa. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Evolutionary Biology
volume
14
issue
2
pages
277 - 287
publisher
John Wiley & Sons
external identifiers
  • scopus:0035059094
ISSN
1420-9101
DOI
10.1046/j.1420-9101.2001.00273.x
language
English
LU publication?
yes
id
4e90a1e3-bb96-4c23-9573-a0920d6cc1e8 (old id 145754)
date added to LUP
2007-06-26 08:34:22
date last changed
2018-01-07 05:21:26
@article{4e90a1e3-bb96-4c23-9573-a0920d6cc1e8,
  abstract     = {Mating pattern and gene flow were studied in the contact zone between two morphologically very similar Chiffchaff taxa (Phylloscopus collybita, P. brehmii) in SW France and northern Spain. Mating was assortative in brehmii, but not in collybita. Mixed matings were strongly asymmetric (excess of callybita male x brehmii female pairs), but did produce viable offspring in some cases. Sequence divergence of the mitochondrial cytochrome b gene was 4.6%; Haplotypes segregated significantly with phenotype (only five 'mismatches' among 94 individuals), demonstrating that mitochondrial gene flow was very restricted. The estimated proportion of F-1 hybrids in the reproductive population was significantly lower than expected under a closed population model, indicating strong selection against hybrids. Genetic typing of 101 individuals at four microsatellite loci also showed significant population differentiation, but nuclear gene flow was estimated to be 75 times higher than mitochondrial gene flow. This strong discrepancy is probably due to unisexual hybrid sterility (Haldane's rule). Thus, there is a strong, but incomplete, reproductive barrier between these taxa.},
  author       = {Helbig, AJ and Salomon, M and Bensch, Staffan and Seibold, I},
  issn         = {1420-9101},
  language     = {eng},
  number       = {2},
  pages        = {277--287},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Evolutionary Biology},
  title        = {Male-biased gene flow across an avian hybrid zone: evidence from mitochondrial and microsatellite DNA},
  url          = {http://dx.doi.org/10.1046/j.1420-9101.2001.00273.x},
  volume       = {14},
  year         = {2001},
}