globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.12850
论文题名:
Genetic diversity is related to climatic variation and vulnerability in threatened bull trout
作者: Kovach R.P.; Muhlfeld C.C.; Wade A.A.; Hand B.K.; Whited D.C.; Dehaan P.W.; Al-Chokhachy R.; Luikart G.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期:7
起始页码: 2510
结束页码: 2524
语种: 英语
英文关键词: Bull trout ; Climate change ; Conservation genetics ; Genetic diversity ; Salmonid ; Stream flow ; Temperature ; Vulnerability
Scopus关键词: climate variation ; conservation genetics ; decision making ; environmental disturbance ; genetic structure ; salmonid ; species conservation ; streamflow ; temperature ; vulnerability ; Columbia Basin ; Salmonidae ; Salvelinus confluentus
英文摘要: Understanding how climatic variation influences ecological and evolutionary processes is crucial for informed conservation decision-making. Nevertheless, few studies have measured how climatic variation influences genetic diversity within populations or how genetic diversity is distributed across space relative to future climatic stress. Here, we tested whether patterns of genetic diversity (allelic richness) were related to climatic variation and habitat features in 130 bull trout (Salvelinus confluentus) populations from 24 watersheds (i.e., ~4-7th order river subbasins) across the Columbia River Basin, USA. We then determined whether bull trout genetic diversity was related to climate vulnerability at the watershed scale, which we quantified on the basis of exposure to future climatic conditions (projected scenarios for the 2040s) and existing habitat complexity. We found a strong gradient in genetic diversity in bull trout populations across the Columbia River Basin, where populations located in the most upstream headwater areas had the greatest genetic diversity. After accounting for spatial patterns with linear mixed models, allelic richness in bull trout populations was positively related to habitat patch size and complexity, and negatively related to maximum summer temperature and the frequency of winter flooding. These relationships strongly suggest that climatic variation influences evolutionary processes in this threatened species and that genetic diversity will likely decrease due to future climate change. Vulnerability at a watershed scale was negatively correlated with average genetic diversity (r = -0.77; P < 0.001); watersheds containing populations with lower average genetic diversity generally had the lowest habitat complexity, warmest stream temperatures, and greatest frequency of winter flooding. Together, these findings have important conservation implications for bull trout and other imperiled species. Genetic diversity is already depressed where climatic vulnerability is highest; it will likely erode further in the very places where diversity may be most needed for future persistence. © 2015 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61609
Appears in Collections:影响、适应和脆弱性

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作者单位: Northern Rocky Mountain Science Center, U.S. Geological Survey, West Glacier, MT, United States; Flathead Biological Station, Fish and Wildlife Genomics Group, University of Montana, Polson, MT, United States; Abernathy Fish Technology Center, United States Fish and Wildlife Service, Longview, WA, United States; Northern Rocky Mountain Science Center, U.S. Geological Survey, Bozeman, MT, United States

Recommended Citation:
Kovach R.P.,Muhlfeld C.C.,Wade A.A.,et al. Genetic diversity is related to climatic variation and vulnerability in threatened bull trout[J]. Global Change Biology,2015-01-01,21(7)
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