Patterns of genetic diversity and structure in Antarctic and sub-Antarctic Nacella (Patellogastropoda: Nacellidae) species.

• Published in: Biodiversity
• Main Authors: González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Saucède, Thomas, Féral, Jean-Pierre, Mansilla, Andrés, Poulin, Elie
• Other Authors: GAIA-Antártica, Universidad de Magallanes (UMAG), Laboratorio de Ecología Molecular (LEM), Instituto de Ecología y Biodiversidad (IEB), Fundación Ictiológica, Biogéosciences UMR 6282 (BGS), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement IRD : UMR237-Centre National de la Recherche Scientifique (CNRS), Departamento de Recursos Naturales, Study supported by a Fondecyt Initiation Project 11140087, Chilean Antarctic Institute INACH (Office Project G_04-11) , Projects P05-002 ICM and PFB 023 (Instituto de Ecología y Biodiversidad IEB, Universidad de Chile).
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2016
• Subjects: Southern Ocean; biogeography; phylogeography; Antarctic Circumpolar Current; Last Glacial Maximum; Nacella; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; [SDV.BID]Life Sciences [q-bio]/Biodiversity; Antarctic; Antarctic Peninsula; Kerguelen; Kerguelen Island; Patagonia; The Antarctic; Antarc*
• Online Access: https://hal.archives-ouvertes.fr/hal-01408790; https://hal.archives-ouvertes.fr/hal-01408790/document; https://hal.archives-ouvertes.fr/hal-01408790/file/2016_Gonzalez-Wevar_Biodiversity_pr_Patterns%20of%20genetic%20diversity%20and%20structure%20in%20Antarctic%20and%20sub-Antractic%20Nacella%20%28Patellogastropoda-%20Nacellidae%29%20species.pdf; https://doi.org/10.1080/14888386.2016.1181573

10 pages International audience The biogeography of the Southern Ocean reflects complex interactions between major macro-evolutionary forces and biotic elements. Major gateway openings, the establishment of the Antarctic Circumpolar Current and climate cooling are deeply connected to the composition, abundance and distribution of the Southern Ocean marine benthic fauna. Glacial episodes of the Quaternary heavily impacted the distribution of the genetic variation of the Southern Ocean biota. The genus Nacella includes 12 nominal species in different provinces of the Southern Ocean. In this study, we compared patterns of mitochondrial DNA diversity in three Nacella species from Antarctic Peninsula, Kerguelen Island and Patagonia. Low levels of genetic diversity and absence of genetic structure characterise each one of them showing the strong impact of ice advances and retreats over their respective demographics. Haplotype diversity, short genealogies and demographic inference recorded suggest the occurrence of a more dramatic demographic process in Antarctic Peninsula than in the sub-Antarctic.