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

Mark Ravinet, Chris Harrod, Christophe Eizaguirre, Paulo A. Prodöhl

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10 Citations (Scopus)
241 Downloads (Pure)

Abstract

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.

Original languageEnglish
Pages (from-to)2488-2504
Number of pages17
JournalEcology and Evolution
Volume4
Issue number12
Early online date21 May 2014
DOIs
Publication statusPublished - Jun 2014

Keywords

  • ABC
  • anadromous fish
  • British Isles
  • phylogeographical hypothesis testing
  • statistical phylogeography
  • LAST GLACIAL MAXIMUM
  • MULTILOCUS GENOTYPE DATA
  • GASTEROSTEUS-ACULEATUS
  • THREESPINE STICKLEBACK
  • BRITISH-ISLES
  • STATISTICAL PHYLOGEOGRAPHY
  • MICROSATELLITE DATA
  • ATLANTIC SALMON
  • HISTORY
  • SPECIATION

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