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Assessing Evolutionary Significant Units (ESU) of the Endangered Freshwater Pearl Mussel (Margaritifera margaritifera) in Southeast Norway on the Basis of Genetic Analysis

Faculty of Applied Ecology, Agricultural Sciences and Biotechnology, Inland Norway University of Applied Sciences, N-2418 Elverum, Norway
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Genes 2020, 11(9), 1061; https://doi.org/10.3390/genes11091061
Received: 21 July 2020 / Revised: 29 August 2020 / Accepted: 4 September 2020 / Published: 8 September 2020
(This article belongs to the Section Animal Genetics and Genomics)
A total of 312 specimens of freshwater pearl mussel (Margaritifera margaritifera) were sampled from 11 populations, located in four different river systems in Southeast Norway, and analyzed for 11 simple sequence repeat (SSR) (microsatellite) markers. All study populations have landlocked brown trout (Salmo trutta) as the only possible host. Several populations had experienced recruitment failure, probably due to low pH (about 6.0) and calcium concentration. STRUCTURE clustering analysis revealed two genetic clusters, of which one cluster occurred mainly in the western river systems, and totally dominated in one population (Fallselva (A-FAL)) that had higher genetic diversity than the others. Cluster 2 completely dominated in the populations of the eastern river systems, and all of them had low genetic diversity. Bottleneck events were indicated in all populations and the inbreeding coefficient FIS was significant in all populations, except for the southernmost population (Sørkedalselva (B-SØR)), which was the only population with genotypes in Hardy–Weinberg equilibrium. FIS were especially high in the populations of the eastern river systems, and maximum shell length was negatively correlated to FIS. If artificially breeding and stocking should become necessary for future preservation, it should be based on single populations; alternatively, the eastern populations should be based on cross-breeding of populations within the cluster to increase their genetic diversity. View Full-Text
Keywords: freshwater bivalves; genetic diversity; immigration; landlocked; isolation; threats freshwater bivalves; genetic diversity; immigration; landlocked; isolation; threats
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MDPI and ACS Style

Linløkken, A.N.; Garlie, S.; Johansen, W.; Wilson, R.C. Assessing Evolutionary Significant Units (ESU) of the Endangered Freshwater Pearl Mussel (Margaritifera margaritifera) in Southeast Norway on the Basis of Genetic Analysis. Genes 2020, 11, 1061. https://doi.org/10.3390/genes11091061

AMA Style

Linløkken AN, Garlie S, Johansen W, Wilson RC. Assessing Evolutionary Significant Units (ESU) of the Endangered Freshwater Pearl Mussel (Margaritifera margaritifera) in Southeast Norway on the Basis of Genetic Analysis. Genes. 2020; 11(9):1061. https://doi.org/10.3390/genes11091061

Chicago/Turabian Style

Linløkken, Arne N., Silje Garlie, Wenche Johansen, and Robert C. Wilson 2020. "Assessing Evolutionary Significant Units (ESU) of the Endangered Freshwater Pearl Mussel (Margaritifera margaritifera) in Southeast Norway on the Basis of Genetic Analysis" Genes 11, no. 9: 1061. https://doi.org/10.3390/genes11091061

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