Recent physical connections may explain weak genetic structure in western Alaskan chum salmon (Oncorhynchus keta) populations

Ecology and Evolution

Michael R. Garvin⁴  Christine M. Kondzela³  Patrick C. Martin¹  Bruce Finney⁵  Jeffrey Guyon³  William D. Templin²  Nick DeCovich²  Sara Gilk-Baumer² 

[1] Concerned Area M Fishermen, 2771 Deer Creek Drive, Bozeman, Montana;Alaska Department of Fish and Game, Division of Commercial Fisheries, Anchorage, Alaska;Auke Bay Laboratories, Alaska Fisheries Science Center, National Oceanic and Atmospheric Administration, Ted Stevens Marine Research Institute, Juneau, Alaska;School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Juneau, Alaska;Departments of Biological Sciences and Geosciences, Idaho State University, Pocatello, Idaho

关键词: Chum salmon;    isolation‐by‐distance;    landscape genetics;    microsatellite;    population genetics;    SNP;   

DOI  :  10.1002/ece3.628

来源: Wiley

【 摘 要 】

Abstract

Low genetic divergence at neutral loci among populations is often the result of high levels of contemporary gene flow. Western Alaskan summer-run chum salmon (Oncorhynchus keta) populations demonstrate weak genetic structure, but invoking contemporary gene flow as the basis for the low divergence is problematic because salmon home to their natal streams and some of the populations are thousands of kilometers apart. We used genotypes from microsatellite and single nucleotide polymorphism loci to investigate alternative explanations for the current genetic structure of chum salmon populations from western Alaska. We also estimated current levels of gene flow among Kuskokwim River populations. Our results suggest that weak genetic structure is best explained by physical connections that occurred after the Holocene Thermal Maximum among the Yukon, Kuskokwim, and Nushagak drainages that allowed gene flow to occur among now distant populations.

【 授权许可】

CC BY   
© 2013 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.

Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.