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

• Main Authors: Neiva, João, Serrao, Ester A., Assis, Jorge, Pearson, Gareth, Coyer, James A., Olsen, Jeanine L., Hoarau, Galice, Valero, Myriam
• Other Authors: Centre of Marine Sciences Faro (CCMAR), University of Algarve Portugal, Centro Interdisciplinar de Investigaçao Marinha e Ambiental (CIMAR), Universidade do Algarve (UAlg), Cornell University New York, Groningen Institute for Evolutionary Life Sciences, Service de bactériologie, parasitologie, virologie et hygiène hospitalière La réunion, Groupe Hospitalier Sud Ile-de-France (GHSIF)-CHR La réunion, Evolutionary Biology and Ecology of Algae (EBEA), Station biologique de Roscoff Roscoff (SBR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Pontificia Universidad Católica de Chile (UC)-Universidad Austral de Chile-Centre National de la Recherche Scientifique (CNRS)
• Format: Book Part
• Language: English
• Published: HAL CCSD 2016
• Subjects: Ongoing climate change; Marine introductions; Glacial–interglacial cycles; North-Atlantic intertidal; Climatic refugia; Comparative phylogeography; Fucoid seaweeds; Genetic diversity; Latitudinal range shifts; Pathways of range expansion; Rafting; Restricted dispersal; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; North Atlantic; Northeast Atlantic; Northwest Atlantic
• Online Access: https://hal.science/hal-01262364; https://doi.org/10.1007/978-94-017-7534-2_11

International audience 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.