Climate Oscillations, Range Shifts and Phylogeographic Patterns of North Atlantic Fucaceae

Abstract : Members of the seaweed family Fucaceae have been recurrent models in North Atlantic phylogeographic research; numerous studies have been published since 2000, and this review synthesizes their major findings. Fucoid species exhibited diverse responses to glacial–interglacial cycles, but evidence indicates there were a few common refugial areas such as northwestern Iberia, the Celtic Sea (Brittany/Ireland) region and the Northwest Atlantic. In genetically rich refugial areas, pervasive genetic breaks confirmed presently limited gene flow between adjacent distinct genetic groups. In contrast with the maintenance of sharp genetic breaks, most species experienced extensive migration during post-glacial expansion. Poleward migrations in the Northeast Atlantic followed routes along northwestern Ireland and the transgressing English Channel. These patterns support the role of density-blocking in maintaining sharp genetic breaks at contact zones, and of long-distance dispersal from range edges in mediating expansion into uninhabited regions. The data also indicate that expansions involve mostly the genetic groups located at range edges rather than the entire species' gene pool, both poleward during interglacials and toward warmer regions during glacial periods. Fucoid expansions J. Neiva (&) Á E.
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Submitted on : Thursday, January 28, 2016 - 3:38:07 PM
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João Neiva, Ester A. Serrao, Jorge Assis, Gareth Pearson, James A. Coyer, et al.. Climate Oscillations, Range Shifts and Phylogeographic Patterns of North Atlantic Fucaceae. Seaweed Phylogeography, 2016, ⟨10.1007/978-94-017-7534-2_11⟩. ⟨hal-01262364⟩

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