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Small-scale patterns in snowmelt timing affect gene flow and the distribution of genetic diversity in the alpine dwarf shrub Salix herbacea

Small-scale patterns in snowmelt timing affect gene flow and the distribution of genetic diversity in the alpine dwarf shrub Salix herbacea

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CORTÉS, Andres J., Stephan WAEBER, Christian LEXER, Janosch SEDLACEK, Julia A. WHEELER, Mark VAN KLEUNEN, Oliver BOSSDORF, Günter HOCH, Christian RIXEN, Sonja WIPF, Sophie KARRENBERG, 2014. Small-scale patterns in snowmelt timing affect gene flow and the distribution of genetic diversity in the alpine dwarf shrub Salix herbacea. In: Heredity. 113(3), pp. 233-239. ISSN 0018-067X. eISSN 1365-2540

@article{Cortes2014-09Small-28609, title={Small-scale patterns in snowmelt timing affect gene flow and the distribution of genetic diversity in the alpine dwarf shrub Salix herbacea}, year={2014}, doi={10.1038/hdy.2014.19}, number={3}, volume={113}, issn={0018-067X}, journal={Heredity}, pages={233--239}, author={Cortés, Andres J. and Waeber, Stephan and Lexer, Christian and Sedlacek, Janosch and Wheeler, Julia A. and van Kleunen, Mark and Boßdorf, Oliver and Hoch, Günter and Rixen, Christian and Wipf, Sonja and Karrenberg, Sophie} }

Wipf, Sonja Rixen, Christian eng Boßdorf, Oliver Hoch, Günter Cortés, Andres J. Cortés, Andres J. 2014-09 Small-scale patterns in snowmelt timing affect gene flow and the distribution of genetic diversity in the alpine dwarf shrub Salix herbacea Wipf, Sonja Lexer, Christian 2014-08-01T11:59:31Z Rixen, Christian Boßdorf, Oliver Waeber, Stephan Sedlacek, Janosch Sedlacek, Janosch Lexer, Christian Heredity Waeber, Stephan Wheeler, Julia A. van Kleunen, Mark Karrenberg, Sophie deposit-license Current threats to biodiversity, such as climate change, are thought to alter the within-species genetic diversity among microhabitats in highly heterogeneous alpine environments. Assessing the spatial organization and dynamics of genetic diversity within species can help to predict the responses of organisms to environmental change. In this study, we evaluated whether small-scale heterogeneity in snowmelt timing restricts gene flow between microhabitats in the common long-lived dwarf shrub Salix herbacea L. We surveyed 273 genets across 12 early- and late-snowmelt sites (that is, ridges and snowbeds) in the Swiss Alps for phenological variation over 2 years and for genetic variation using seven SSR markers. Phenological differentiation triggered by differences in snowmelt timing did not correlate with genetic differentiation between microhabitats. On the contrary, extensive gene flow appeared to occur between microhabitats and slightly less extensively among adjacent mountains. However, ridges exhibited significantly lower levels of genetic diversity than snowbeds, and patterns of effective population size (N<sub>e</sub>) and migration (N<sub>e</sub>m) between microhabitats were strongly asymmetric, with ridges acting as sources and snowbeds as sinks. As no recent genetic bottlenecks were detected in the studied sites, this asymmetry is likely to reflect current meta-population dynamics of the species dominated by gene flow via seeds rather than ancient re-colonization after the last glacial period. Overall, our results suggest that seed dispersal prevents snowmelt-driven genetic isolation, and snowbeds act as sinks of genetic diversity. We discuss the consequences of such small-scale variation in gene flow and diversity levels for population responses to climate change. Wheeler, Julia A. van Kleunen, Mark Hoch, Günter 2014-08-01T11:59:31Z Karrenberg, Sophie

Dateiabrufe seit 01.10.2014 (Informationen über die Zugriffsstatistik)

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