Cycles of trans-Arctic dispersal and vicariance, and diversification of the amphi-boreal marine fauna.

Journal of Evolutionary Biology
Hanna M LaakkonenRisto Väinölä

Abstract

The amphi-boreal faunal element comprises closely related species and conspecific populations with vicarious distributions in the North Atlantic and North Pacific basins. It originated from an initial trans-Arctic dispersal in the Pliocene after the first opening of the Bering Strait, and subsequent inter-oceanic vicariance through the Pleistocene when the passage through the Arctic was severed by glaciations and low sea levels. Opportunities for further trans-Arctic dispersal have risen at times, however, and molecular data now expose more complex patterns of inter-oceanic affinities and dispersal histories. For a general view on the trans-Arctic dynamics and of the roles of potential dispersal-vicariance cycles in generating systematic diversity, we produced new phylogeographic data sets for amphi-boreal taxa in 21 genera of invertebrates and vertebrates, and combined them with similar published data sets of mitochondrial coding gene variation, adding up to 89 inter-oceanic comparisons involving molluscs, crustaceans, echinoderms, polychaetes, fishes and mammals. Only 39% of the cases correspond to a simple history of Pliocene divergence; in most taxonomical groups, the range of divergence estimates implies connections throug...Continue Reading

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Citations

Jan 19, 2021·Journal of Evolutionary Biology·Rui FariaSean Stankowski
Jul 1, 2021·Molecular Ecology·Maurine HammelNicolas Bierne
Aug 26, 2021·Ecology and Evolution·Dan L WarrenPeter C Wainwright

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