Abstract：
:Glacial vicariance is regarded as one of the most prevalent drivers of phylogeographic structure and speciation among high-latitude organisms, but direct links between ice advances and range fragmentation have been more difficult to establish in marine than in terrestrial systems. Here we investigate the evolution of largely disjunct (and potentially reproductively isolated) phylogeographic lineages within the amphi-boreal kelp Saccharina latissima s. l. Using molecular data (COI, microsatellites) we confirm that S. latissima comprises also the NE Pacific S. cichorioides complex and is composed of divergent lineages with limited range overlap and genetic admixture. Only a few genetic hybrids were detected throughout a Canadian Arctic/NW Greenland contact zone. The degree of genetic differentiation and sympatric isolation of phylogroups suggest that S. latissima s. l. represents a complex of incipient species. Phylogroup distributions compared with paleo-environmental reconstructions of the cryosphere further suggest that diversification within S. latissima results from chronic glacial isolation in disjunct persistence areas intercalated with ephemeral interglacial poleward expansions and admixture at high-latitude (Arctic) contact zones. This study thus supports a role for glaciations not just in redistributing pre-existing marine lineages but also as a speciation pump across multi-glacial cycles for marine organisms otherwise exhibiting cosmopolite amphi-boreal distributions.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Neiva J,Paulino C,Nielsen MM,Krause-Jensen D,Saunders GW,Assis J,Bárbara I,Tamigneaux É,Gouveia L,Aires T,Marbà N,Bruhn A,Pearson GA,Serrão EAdoi
10.1038/s41598-018-19620-7subject
Has Abstractpub_date
2018-01-18 00:00:00pages
1112issue
1issn
2045-2322pii
10.1038/s41598-018-19620-7journal_volume
8pub_type
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