Following the Antarctic Circumpolar Current: patterns and processes in the biogeography of the limpet Nacella (Mollusca: Patellogastropoda) across the Southern Ocean.

• Published in: Journal of Biogeography
• Main Authors: González-Wevar, Claudio A., Hüne, Mathias, Segovia, Nicolas I., Nakano, Tomoyuki, Spencer, Hamish G., Chown, Steven L., Saucède, Thomas, Johnstone, Glenn, Mansilla, Andrés, Poulin, Elie
• Other Authors: GAIA-Antártica, Universidad de Magallanes (UMAG), Laboratorio de Ecología Molecular (LEM), Instituto de Ecología y Biodiversidad (IEB), Seto Marine Biological Laboratory, Kyoto University Kyoto -Field Science Education and Research Centre, Allan Wilson Center for Molecular Ecology and Evolution, University of Auckland Auckland -University of Otago Dunedin, Nouvelle-Zélande -Massey University-University of Canterbury Christchurch, School of Biological Sciences Clayton, Monash University Clayton, Biogéosciences UMR 6282 Dijon (BGS), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Australian Antarctic Division (AAD), Australian Government, Department of the Environment and Energy, Fondecyt Initiation Project 11140087; Projects P05-002 ICM and PFB 023 (Instituto de Ecología y Biodiversidad IEB, Universidad de Chile); INACH 02-02, INACH 13-05, ECOSC06B02, and Regular Fondecyt Project 1151336; the Allan Wilson Centre; the Australian Antarctic Science Project 4307.
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2017
• Subjects: Antarctic Circumpolar Current; biogeography; lineage-through-time plots; long-distance dispersal; Nacella; Southern Ocean; geo; envir; Antarctic; The Antarctic; Antarc*; Antarctica
• Online Access: https://doi.org/10.1111/jbi.12908; https://hal.archives-ouvertes.fr/hal-01501231

International audience AimWe use an integrative biogeographical approach to further understand the evolution of an important Southern Ocean marine benthic element, the limpet genus Nacella (Mollusca: Patellogastropoda).LocationSouthern Ocean.MethodsWe used multi-locus time-calibrated phylogeny of Nacella at the scale of the whole Southern Ocean to elucidate the underlying processes involved in the origin and diversification of the genus.ResultsDivergence-time estimates suggest that soon after its origin during the mid-Miocene (c. 12.5 Ma), Nacella separated into two main lineages currently distributed in (1) South America and (2) Antarctica and the sub-Antarctic islands. We identified two pulses of diversification, during the late Miocene (8 to 5.5 Ma) and the Pleistocene (< 1 Ma).Main conclusionsMajor periods of climatic and oceanographical change strongly affected the biogeography of Nacella and demonstrate both the long- and short-term influence of the Antarctic Circumpolar Current across the Southern Ocean. Our analyses support the validity of all currently recognized Nacella species and reveal a new South-American lineage. This work constitutes the most detailed molecular-based study of an ecologically important, near-shore invertebrate Southern Ocean group and in so doing contributes to the improved understanding of the underlying patterns and processes in the origin and diversification of marine benthic fauna across this globally important region. 14 pages