Journal
JOURNAL OF FISH BIOLOGY
Volume 84, Issue 2, Pages 523-538Publisher
WILEY
DOI: 10.1111/jfb.12314
Keywords
Alaska; Arctic; Beringia; Chukotka; glaciaton; mitochondrial DNA
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Funding
- Alaska EPSCoR
- U.S. National Science Foundation [DEB 0963767]
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Mitochondrial genetic variability among populations of the blackfish genus Dallia (Esociformes) across Beringia was examined. Levels of divergence and patterns of geographic distribution of mitochondrial DNA lineages were characterized using phylogenetic inference, median-joining haplotype networks, Bayesian skyline plots, mismatch analysis and spatial analysis of molecular variance (SAMOVA) to infer genealogical relationships and to assess patterns of phylogeography among extant mitochondrial lineages in populations of species of Dallia. The observed variation includes extensive standing mitochondrial genetic diversity and patterns of distinct spatial segregation corresponding to historical and contemporary barriers with minimal or no mixing of mitochondrial haplotypes between geographic areas. Mitochondrial diversity is highest in the common delta formed by the Yukon and Kuskokwim Rivers where they meet the Bering Sea. Other regions sampled in this study host comparatively low levels of mitochondrial diversity. The observed levels of mitochondrial diversity and the spatial distribution of that diversity are consistent with persistence of mitochondrial lineages in multiple refugia through the last glacial maximum. (C) 2014 The Fisheries Society of the British Isles
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