Origin and expansion of the world's most widespread pinniped: Range-wide population genomics of the harbour seal (Phoca vitulina)

The harbour seal (Phoca vitulina) is the most widely distributed pinniped, occupying a wide variety of habitats and climatic zones across the Northern Hemisphere. Intriguingly, the harbour seal is also one of the most philopatric seals, raising questions as to how it colonized its current range. To shed light on the origin, remarkable range expansion, population structure and genetic diversity of this species, we used genotyping-by-sequencing to analyse similar to 13,500 biallelic single nucleotide polymorphisms from 286 individuals sampled from 22 localities across the species' range. Our results point to a Northeast Pacific origin of the harbour seal, colonization of the North Atlantic via the Canadian Arctic, and subsequent stepping-stone range expansions across the North Atlantic from North America to Europe, accompanied by a successive loss of genetic diversity. Our analyses further revealed a deep divergence between modern North Pacific and North Atlantic harbour seals, with finer-scale genetic structure at regional and local scales consistent with strong philopatry. The study provides new insights into the harbour seal's remarkable ability to colonize and adapt to a wide range of habitats. Furthermore, it has implications for current harbour seal subspecies delineations and highlights the need for international and national red lists and management plans to ensure the protection of genetically and demographically isolated populations.

NATURVETENSKAP Biologi Biokemi och molekylärbiologi hsv//swe
NATURAL SCIENCES Biological Sciences Biochemistry and Molecular Biology hsv//eng
colonization
genetic diversity
harbour seals
origin
population
structure
subspecies delineation
bottle-nosed dolphins
tursiops-truncatus
genetic diversity
distemper
virus
grey seals
philopatry
speciation
movements
evolution
hokkaido
Biochemistry & Molecular Biology
Environmental Sciences & Ecology
Evolutionary Biology

Schjott, S. R. (author)
Granquist, S. M. (author)
Rosing-Asvid, A. (author)
Dietz, R. (author)
Teilmann, J. (author)
Galatius, A. (author)
Cammen, K. (author)
O'Corry-Crowe, G. (author)
Harding, Karin C.,1968Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences(Swepub:gu)xhardk (author)
Harkonen, T. (author)
Hall, A. (author)
Carroll, E. L. (author)
Kobayashi, Y. (author)
Hammill, M. (author)
Stenson, G. (author)
Frie, A. K. (author)
Lydersen, C. (author)
Kovacs, K. M. (author)
Andersen, L. W. (author)
Hoffman, J. I. (author)
Goodman, S. J. (author)
Vieira, F. G. (author)
Heller, R. (author)
Moltke, I. (author)
Olsen, M. T. (author)
Göteborgs universitetInstitutionen för biologi och miljövetenskap (creator_code:org_t)

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NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Biochemistry and ...

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