Hybridisation with introduced chukars (Alectoris chukar) threatens the gene pool integrity of native rock (A-graeca) and red-legged (A-rufa) partridge populations

Barilani, Marina, Bernard-Laurent, Ariane, Mucci, Nadia, Tabarroni, Cristiano, Kark, Salit, Perez Garrido, Jose Antonio and Randi, Ettore (2007) Hybridisation with introduced chukars (Alectoris chukar) threatens the gene pool integrity of native rock (A-graeca) and red-legged (A-rufa) partridge populations. Biological Conservation, 137 1: 57-69. doi:10.1016/j.biocon.2007.01.014


Author Barilani, Marina
Bernard-Laurent, Ariane
Mucci, Nadia
Tabarroni, Cristiano
Kark, Salit
Perez Garrido, Jose Antonio
Randi, Ettore
Title Hybridisation with introduced chukars (Alectoris chukar) threatens the gene pool integrity of native rock (A-graeca) and red-legged (A-rufa) partridge populations
Journal name Biological Conservation   Check publisher's open access policy
ISSN 0006-3207
Publication date 2007-06-01
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.biocon.2007.01.014
Open Access Status Not yet assessed
Volume 137
Issue 1
Start page 57
End page 69
Total pages 13
Place of publication OXFORD
Publisher ELSEVIER SCI LTD
Language eng
Abstract The decline of over-hunted red-legged (Alectoris rufa) and rock (A. graeca) partridge populations has been contrasted with massive releases of captive-reared birds, often hybrids with non-indigenous A. chukar. Released interspecific hybrids raise the risks of introgressive hybridisation, and can contribute to further depress the fitness of native populations. Aiming to assess the extent of hybridisation, we genotyped the mtDNA control-region and eight nuclear microsatellites in 671 red-legged, rock and chukar partridges and hybrids, identified by phenotypic traits. Results reveal a diffuse occurrence of hybridisation: (1) 39 samples (6.2%) show mtDNA haplotypes discordant with their phenotypes, indicating red-legged and chukar mtDNA introgression in native rock partridges; (2) admixture analyses of the microsatellite genotypes identified 32 additional rock partridges (5.1%) hybridised mainly with chukars. We analysed also 39 samples collected from a presumed natural red-legged x rock partridge hybrid zone in the French Alps. Surprisingly, 28% birds showed typical chukar mtDNAs, indicating hybridisation with introduced chukars or hybrids. This hybrid zone led to an introgression cline of chukar alleles into neighbouring Alpine rock partridges detectable up to 100 km, which was shorter than expected by neutral genetic theory, and that suggested natural selection against hybrids. These findings indicate that introgressive hybridisation may disrupt local adaptations in natural red-legged partridge and rock partridge populations, and call for strict control of farming and restocking operations. (c) 2007 Elsevier Ltd. All rights reserved.
Keyword alectoris
introgression
outbreeding depression
admixture analysis
mtDNA control-region
microsatellites
partridge conservation genetics
Multilocus Genotype Data
Mitochondrial-Dna
Hybrid Zone
Control Region
Evolution
Phylogeography
Ducks
Microsatellites
Amplification
Conservation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: ResearcherID Downloads - Archived
 
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