Parsimony-based pedigree analysis and individual-based landscape genetics suggest topography to restrict dispersal and connectivity in the endangered capercaillie

被引:16
作者
Kormann, Urs [1 ,2 ,3 ,6 ]
Gugerli, Felix [1 ]
Ray, Nicolas [4 ,5 ]
Excoffier, Laurent [2 ,3 ]
Bollmann, Kurt [1 ]
机构
[1] WSL Swiss Fed Res Inst, CH-8903 Birmensdorf, Switzerland
[2] Univ Bern, Inst Ecol & Evolut, CMPG Lab, CH-3012 Bern, Switzerland
[3] Swiss Inst Bioinformat, CH-1015 Lausanne, Switzerland
[4] Univ Geneva, Inst Environm Sci, EnviroSPACE Lab, CH-1227 Carouge, Switzerland
[5] Univ Geneva, Forel Inst, CH-1290 Versoix, Switzerland
[6] Univ Gottingen, Dept Crop Sci, Agroecology, D-37077 Gottingen, Germany
关键词
Landscape genetics; Dispersal; Least-cost path; Non-invasive sampling; Tetrao urogallus; POPULATION-STRUCTURE; TETRAO-UROGALLUS; COMPUTER-PROGRAM; PATCH OCCUPANCY; HABITAT; INFERENCE; FLOW; PARENTAGE; EXTINCTION; DISTANCE;
D O I
10.1016/j.biocon.2012.04.011
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
Connectivity and dispersal are key components determining the persistence of fragmented populations. However, the assessment of dispersal rates and landscape factors affecting functional connectivity remains problematic for species living in small populations, even more so in stress-sensitive, rare or elusive species. In this study, we estimated current dispersal patterns in a regional population of the endangered capercaillie (Tetrao urogallus) using a novel, parsimony-based application of pedigree analysis. In spring 2003 and 2008, we systematically collected non-invasive samples of this forest bird species in five local populations in the north-eastern Pre-Alps of Switzerland. Based on 11 nuclear microsatellites, we identified 86 unique genotypes over the two sampling periods and determined levels of genetic structure. We investigated the relative impact of topography and land use on functional population connectivity by comparing inter-individual genetic distance with GIS-derived least-cost path models representing different dispersal scenarios. Results show that local populations are connected by dispersers, suggesting occasional contemporary gene flow. Mountain ridges were found to hamper capercaillie dispersal, while, at odds with our hypothesis, neither a broad valley nor land use type notably affected gene flow. These results suggest that our study region represents a patchy metapopulation. Our study illustrates how pedigree analysis and landscape genetic methods can significantly contribute to the understanding of dispersal and connectivity in rare and elusive species. (c) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:241 / 252
页数:12
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