Draining the Swamping Hypothesis: Little Evidence that Gene Flow Reduces Fitness at Range Edges.

Autor: Kottler EJ; Department of Biological Sciences, 800 22nd ST NW, Suite 6000, George Washington University, Washington, DC 20052, USA. Electronic address: ekottler@gwu.edu., Dickman EE; Yosemite National Park, PO Box 700, El Portal, CA 95318, USA., Sexton JP; Department of Life and Environmental Sciences, 5200 North Lake Rd., University of California, Merced, CA 95343, USA., Emery NC; Department of Ecology and Evolutionary Biology, 1900 Pleasant St., University of Colorado Boulder, Boulder, CO 80309-0334, USA., Franks SJ; Department of Biological Sciences, Fordham University, 441 E Fordham Road, Bronx, NY 10458, USA.
Jazyk: angličtina
Zdroj: Trends in ecology & evolution [Trends Ecol Evol] 2021 Jun; Vol. 36 (6), pp. 533-544. Date of Electronic Publication: 2021 Mar 18.
DOI: 10.1016/j.tree.2021.02.004
Abstrakt: The genetic swamping hypothesis proposes that gene flow from central to peripheral populations inhibits local adaptation and is one of the most widely recognized explanations for range limitation. We evaluated empirical support for this hypothesis in studies quantifying patterns of gene flow to peripheral populations and their resulting fitness outcomes. We found little evidence that gene flow is generally asymmetric from central to peripheral populations and also that gene flow tends to have positive effects on edge population fitness. These findings contravene the long-held assumption that genetic swamping is a common driver of species range limits, and bear important implications for understanding the role of gene flow in range evolution and for predicting and managing eco-evolutionary responses to climate change.
Competing Interests: Declaration of Interests No interests to declare.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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