Phylogeography of Seaweeds in the South East Pacific: Complex Evolutionary Processes Along a Latitudinal Gradient

Abstract : The coast along the temperate South East Pacific (SEP) presents a simple linear topography with a north-south orientation spanning more than 4600 km. However, environmental heterogeneity associated with two major biogeographic boundaries has been described along the SEP (30–33°S and 42°S). Recent phylo-geographic studies of seaweeds revealed the existence of different cryptic species along the SEP coast and that most of the genetic breaks between them are broadly congruent with the biogeographic boundaries. These phylogeographic patterns characterized by genetic discontinuities could be attributed to historical vicariance or to budding speciation. For SEP seaweeds, two major phylogeographic patterns are observed. Endemic species living north of 42°S show complex haplotype networks and an almost complete genetic isolation between populations located only a few kilometres from each other. This extreme genetic patchiness has been related to the combined effects of limited dispersal, reduced population size and high population turnover of these intertidal seaweeds due to stochastic effects of climatic and
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Submitted on : Thursday, January 28, 2016 - 3:39:02 PM
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Marie-Laure Guillemin, Myriam Valero, Florence Tellier, Carlos Macaya, Christophe Destombe, et al.. Phylogeography of Seaweeds in the South East Pacific: Complex Evolutionary Processes Along a Latitudinal Gradient. Seaweed Phylogeography, pp.251-277, 2016, Seaweed Phylogeography, 978-94-017-7532-8. ⟨10.1007/978-94-017-7534-2_10⟩. ⟨hal-01262277⟩

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