Gene flow and hybridisation in a mixed oak forest (Quercus pyrenaica Willd. and Quercus petraea (Matts.) Liebl.) in central Spain

被引:105
作者
Valbuena-Carabaña, M
González-Martínez, SC
Sork, VL
Collada, C
Soto, A
Goicoechea, PG
Gil, L
机构
[1] Univ Politecn Madrid, ETSI Montes, Unidad Anat Fisiol & Genet, E-28040 Madrid, Spain
[2] INIA, CIFOR, Ctr Invest Forestal, Unidad Genet Forestal, Madrid 28040, Spain
[3] Univ Calif Los Angeles, Dept Ecol & Evolutionary Biol, Los Angeles, CA 90095 USA
[4] ETSIM, Dept Biotecnol, Madrid 28040, Spain
[5] NEIKER AB, Vitoria 01080, Spain
关键词
microsatellites; gene flow; hybrid zones; introgression; genetic differentiation; Quercus;
D O I
10.1038/sj.hdy.6800752
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Oaks are long- standing models for the study of gene flow and hybridisation. Temperate ( Quercus petraea) and sub-Mediterranean ( Quercus pyrenaica) oaks coexist in central Spain, showing remarkable differences in population size and structure. Q. petraea has a scattered distribution in central Spain, where it is at one of the southernmost limits of its range, and forms low- density stands; in contrast, Q. pyrenaica is widespread in the region. We selected a mixed population of the two species ( similar to 13 ha, 176 adults and 96 saplings) to compare the patterns of gene flow within each species and the extent of introgression between them. Using five nuclear microsatellite markers, we performed a parentage analysis and found considerable immigration from outside the stand ( similar to 38% for Q. petraea and similar to 34% for Q. pyrenaica), and estimated average seed- dispersal distances of 42 and 14 m for Q. petraea and Q. pyrenaica, respectively. Introgression between species was also estimated using our microsatellite battery. First, we developed a multivariate discriminant approach and, second, we compared our results with a widely used clustering method ( STRUCTURE). Both analyses were consistent with a low level of introgression between Q. petraea and Q. pyrenaica. Indeed, only 15 adult trees, similar to 8.5%, were identified as putative hybrids when both methods of analysis were combined. Hybrids may be most common in contact zones due merely to physical proximity.
引用
收藏
页码:457 / 465
页数:9
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