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Contrasting population genetic structure among freshwater-resident and anadromous lampreys : the role of demographic history, differential dispersal, and anthropogenic barriers to movement.

Bracken, F.S.A. and Hoelzel, A.R. and Hume, J.B. and Lucas, M.C. (2015) 'Contrasting population genetic structure among freshwater-resident and anadromous lampreys : the role of demographic history, differential dispersal, and anthropogenic barriers to movement.', Molecular ecology., 24 (6). pp. 1188-1204.

Abstract

The tendency of many species to abandon migration remains a poorly understood aspect of evolutionary biology that may play an important role in promoting species radiation by both allopatric and sympatric mechanisms. Anadromy inherently offers an opportunity for the colonisation of freshwater environments, and the shift from an anadromous to a wholly-freshwater life-history has occurred in many families of fishes. Freshwater-resident forms have arisen repeatedly among lampreys (within the Petromyzontidae and Mordaciidae), and there has been much debate as to whether anadromous lampreys, and their derived freshwater-resident analogues, constitute distinct species or are divergent ecotypes of polymorphic species. Samples of 543 European river lamprey Lampetra fluviatilis (mostly from anadromous populations) and freshwater European brook lamprey L. planeri from across 18 sites, primarily in the British Isles, were investigated for 13 polymorphic microsatellite DNA loci, and 108 samples from six of these sites were sequenced for 829bp of mitochondrial DNA (mtDNA). We found contrasting patterns of population structure for mtDNA and microsatellite DNA markers, such that low diversity and little structure were seen for all populations for mtDNA (consistent with a recent founder expansion event), while fine-scale structuring was evident for nuclear markers. Strong differentiation for microsatellite DNA loci was seen among freshwater-resident L. planeri populations and between L. fluviatilis and L. planeri in most cases, but little structure was evident among anadromous L. fluviatilis populations. We conclude that post-glacial colonisation founded multiple freshwater-resident populations with strong habitat fidelity and limited dispersal tendencies, that became highly differentiated, a pattern that was likely intensified by anthropogenic barriers.

Item Type:Article
Keywords:Anadromy, Lampetra, Microsatellite, Life history, Speciation, Barriers to migration.
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1111/mec.13112
Publisher statement:© 2015 The Authors. Molecular Ecology Published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Date accepted:09 February 2015
Date deposited:23 February 2015
Date of first online publication:06 March 2015
Date first made open access:No date available

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