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Göteborgs universitets publikationer

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

Författare och institution:
Mark Ravinet (Institutionen för biologi och miljövetenskap, Tjärnö marinbiologiska laboratorium); C. Harrod (-); C. Eizaguirre (-); P. A. Prodohl (-)
Publicerad i:
Ecology and Evolution, 4 ( 12 ) s. 2488-2504
Artikel, refereegranskad vetenskaplig
Sammanfattning (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.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Biologiska vetenskaper
ABC, anadromous fish, British Isles, phylogeographical hypothesis testing, statistical phylogeography
Postens nummer:
Posten skapad:
2014-07-21 12:53
Posten ändrad:
2014-07-21 13:39

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