Geographic hierarchical population genetic structuring in British European whitefish ( Coregonus lavaretus ) and its imp
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RESEARCH ARTICLE
Geographic hierarchical population genetic structuring in British European whitefish (Coregonus lavaretus) and its implications for conservation M. Crotti1 · C. E. Adams1,2 · E. C. Etheridge2 · C. W. Bean2,3 · A. R. D. Gowans4 · R. Knudsen5 · A. A. Lyle2 · P. S. Maitland2 · I. J. Winfield6 · K. R. Elmer1 · K. Præbel7 Received: 8 July 2020 / Accepted: 24 July 2020 © The Author(s) 2020
Abstract The European whitefish Coregonus lavaretus complex represents one of the most diverse radiations within salmonids, with extreme morphological and genetic differentiation across its range. Such variation has led to the assignment of many populations to separate species. In Great Britain, the seven native populations of C. lavaretus (two in Scotland, four in England, one in Wales) were previously classified into three species, and recent taxonomic revision resurrected the previous nomenclature. Here we used a dataset of 15 microsatellites to: (1) investigate the genetic diversity of British populations, (2) assess the level of population structure and the relationships between British populations. Genetic diversity was highest in Welsh (HO = 0.50, AR = 5.29), intermediate in English ( HO = 0.41–0.50, AR = 2.83–3.88), and lowest in Scottish populations (HO = 0.28–0.35, AR = 2.56–3.04). Population structure analyses indicated high genetic differentiation (global F ST = 0.388) between all populations but for the two Scottish populations ( FST = 0.063) and two English populations ( FST = 0.038). Principal component analysis and molecular ANOVA revealed separation between Scottish, English, and Welsh populations, with the Scottish populations being the most diverged. We argue that the data presented here are not sufficient to support a separation of the British European whitefish populations into three separate species, but support the delineation of different ESUs for these populations. Keywords Microsatellites · Glaciation · Salmonids · Conservation genetics · Freshwater fishes · DAPC
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10592-020-01298-y) contains supplementary material, which is available to authorized users. * M. Crotti [email protected]; [email protected] 1
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Institute of Biodiversity, Animal Health & Comparative Medicine, College of Medical, Veterinary & Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK Scottish Centre for Ecology and the Natural Environment, University of Glasgow, Rowardennan, Loch Lomond, Glasgow G63 0AW, UK Scottish Natural Heritage, Caspian House, Clydebank Business Park, Clydebank, Glasgow G81 2NR, UK
Accurate species delineation is fundamental for the practical protection and conservation of biota (Mace 2004), but the use of genetic markers sometimes disagree with traditional morphology-based taxonomy (Bickford et al. 2007; Padial et al. 2010; Mayr 2011). Conflicts between morphological and molecular data are common in temperate freshwater 4
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