Unique mitochondrial DNA lineages in Irish sticklebackpopulations: cryptic refugium or rapid recolonization?

Ravinet, M., Harrod, C., Eizaguirre, Christophe and Prodöhl, P. A. (2014) Unique mitochondrial DNA lineages in Irish sticklebackpopulations: cryptic refugium or rapid recolonization? Ecology and Evolution, 4 (12). pp. 2488-2504. DOI 10.1002/ece3.853.

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Repeated recolonization of freshwater environments following Pleistocene glaciations has played a major role in the evolution and adaptation of anadromous taxa. Located at the western fringe of Europe, Ireland and Britain were likely recolonized rapidly by anadromous fishes from the North Atlantic following the last glacial maximum (LGM). While the presence of unique mitochondrial haplotypes in Ireland suggests that a cryptic northern refugium may have played a role in recolonization, no explicit test of this hypothesis has been conducted. The three-spined stickleback is native and ubiquitous to aquatic ecosystems throughout Ireland, making it an excellent model species with which to examine the biogeographical history of anadromous fishes in the region. We used mitochondrial and microsatellite markers to examine the presence of divergent evolutionary lineages and to assess broad-scale patterns of geographical clustering among postglacially isolated populations. Our results confirm that Ireland is a region of secondary contact for divergent mitochondrial lineages and that endemic haplotypes occur in populations in Central and Southern Ireland. To test whether a putative Irish lineage arose from a cryptic Irish refugium, we used approximate Bayesian computation (ABC). However, we found no support for this hypothesis. Instead, the Irish lineage likely diverged from the European lineage as a result of postglacial isolation of freshwater populations by rising sea levels. These findings emphasize the need to rigorously test biogeographical hypothesis and contribute further evidence that postglacial processes may have shaped genetic diversity in temperate fauna.

Document Type: Article
Additional Information: WOS:000337738800013
Keywords: ABC;anadromous fish; British Isles; phylogeographical hypothesis testing; statistical phylogeography
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Evolutionary Ecology of Marine Fishes
Refereed: Yes
DOI etc.: 10.1002/ece3.853
ISSN: 2045-7758
Date Deposited: 29 Oct 2013 09:40
Last Modified: 11 Aug 2014 13:22
URI: http://eprints.uni-kiel.de/id/eprint/22296

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