期刊
EVOLUTIONARY APPLICATIONS
卷 10, 期 2, 页码 199-211出版社
WILEY
DOI: 10.1111/eva.12443
关键词
connectivity; gene flow; isolation; landscape genetics; nuclear loci; Rangifer tarandus; reciprocal causal modelling
资金
- Canadian Association of Petroleum Producers
- Weyerhaueser Company
- Parks Canada
- Shell
- BC Ministry of Forests
- Alberta Fish and Wildlife Division
- World Wildlife Fund Canada
- Conoco-Phillips
- Alberta Conservation Association
- NSERC
- UCD SEED
Ecosystem fragmentation and habitat loss have been the focus of landscape management due to restrictions on contemporary connectivity and dispersal of populations. Here, we used an individual approach to determine the drivers of genetic differentiation in caribou of the Canadian Rockies. We modelled the effects of isolation by distance, landscape resistance and predation risk and evaluated the consequences of individual migratory behaviour (seasonally migratory vs. sedentary) on gene flow in this threatened species. We applied distance-based and reciprocal causal modelling approaches, testing alternative hypotheses on the effects of geographic, topographic, environmental and local population-specific variables on genetic differentiation and relatedness among individuals. Overall, gene flow was restricted to neighbouring local populations, with spatial coordinates, local population size, groups and elevation explaining connectivity among individuals. Landscape resistance, geographic distances and predation risk were correlated with genetic distances, with correlations threefold higher for sedentary than for migratory caribou. As local caribou populations are increasingly isolated, our results indicate the need to address genetic connectivity, especially for populations with individuals displaying different migratory behaviours, whilst maintaining quality habitat both within and across the ranges of threatened populations.
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