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González-Wevar C.A., Hüne M., Segovia N.I., Nakano T., Spencer H., Chown S.L., Saucède T.; Johnstone G., Mansilla A. & E. Poulin |
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Title |
Following the Antarctic Circumpolar Current: Patterns and processes in the biogeography of the limpet Nacella (Mollusca: Patellogastropoda) across the Southern Ocean |
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Journal Article |
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2016 |
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JOURNAL OF BIOGEOGRAPHY |
Abbreviated Journal |
J. Biogeogr. |
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Aim We use an integrative biogeographical approach to further understand the evolution of an important Southern Ocean marine benthic element, the limpet genus Nacella (Mollusca: Patellogastropoda). Location Southern Ocean. Methods We 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. Results Divergence-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 conclusions Major 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. |
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0305-0270 |
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6455 |
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González-Wevar C., Hüne M., Rosenfeld S., Saucède T., Féral J.-P., Mansilla A. and E. Poulin |
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Patterns of genetic diversity and structure in Antarctic and sub-Antarctic Nacella (Patellogastropoda: Nacellidae) species |
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2016 |
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BIODIVERSITY AND CONSERVATION |
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Biodivers. Conserv. |
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17 |
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1-2 |
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46-55 |
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1044 |
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0960-3115 |
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6456 |
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Exploring the Microdiversity Within Marine Bacterial Taxa: Toward an Integrated Biogeography in the Southern Ocean |
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2021 |
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Frontiers in Microbiology |
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12 |
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1985 |
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Most of the microbial biogeographic patterns in the oceans have been depicted at the whole community level, leaving out finer taxonomic resolution (i.e., microdiversity) that is crucial to conduct intra-population phylogeographic study, as commonly done for macroorganisms. Here, we present a new approach to unravel the bacterial phylogeographic patterns combining community-wide survey by 16S rRNA gene metabarcoding and intra-species resolution through the oligotyping method, allowing robust estimations of genetic and phylogeographic indices, and migration parameters. As a proof-of-concept, we focused on the bacterial genus Spirochaeta across three distant biogeographic provinces of the Southern Ocean; maritime Antarctica, sub-Antarctic Islands, and Patagonia. Each targeted Spirochaeta operational taxonomic units were characterized by a substantial intrapopulation microdiversity, and significant genetic differentiation and phylogeographic structure among the three provinces. Gene flow estimations among Spirochaeta populations support the role of the Antarctic Polar Front as a biogeographic barrier to bacterial dispersal between Antarctic and sub-Antarctic provinces. Conversely, the Antarctic Circumpolar Current appears as the main driver of gene flow, connecting sub-Antarctic Islands with Patagonia and maritime Antarctica. Additionally, historical processes (drift and dispersal limitation) govern up to 86% of the spatial turnover among Spirochaeta populations. Overall, our approach bridges the gap between microbial and macrobial ecology by revealing strong congruency with macroorganisms distribution patterns at the populational level, shaped by the same oceanographic structures and ecological processes. |
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1664-302X |
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1664-302X |
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6457 |
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Gonzalez-Wevar C., Chown S.L., Morley S.A, Coria N., Saucede T., Poulin E. |
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Out of Antarctica: Quaternary colonization of sub-Antarctic Marion Island by the limpet genus Nacella (Patellogastropoda: Nacellidae) |
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2016 |
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POLAR BIOLOGY |
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Polar Biol. |
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39 |
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1 |
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The distribution of the Southern Ocean nearshore marine benthic fauna is the consequence of major geologic, oceanographic, and climatic changes during the last 50 Ma. As a result, a main biogeographic principle in the Southern Ocean is the clear distinction of the Antarctic biota. The Antarctic Polar Front (APF) represents an important barrier between Antarctica and other sub-Antarctic provinces. However, the high degree of genetic affinity between populations of the Antarctic limpet Nacella concinna and its sub-Antarctic relative Nacella delesserti from Marion Island stands against this tenet. Here, we performed new phylogenetic reconstructions in Nacella with special emphasis on the relationship between N. concinna and N.delesserti. Similarly, we performed population-based analyses in N. concinna and N. delesserti to further understand the genetic legacy of the Quaternary glacial cycles. Phylogenetic reconstructions recognized N. concinna and N. delesserti as two closely but distinct monophyletic entities and therefore as valid evolutionary units. The cladogenetic process separating them occurred ~0.35 Ma and is consistent with the origin of Marion Island (~0.45 Ma). Exceptional long-distance dispersal between provinces located inside and outside the APF, rather than revealing the permeability of the Antarctic Polar Front, seems to be related to latitudinal shift in the position of the APF during coldest periods of the Quaternary. Diversity indices, neutrality tests, haplotype networks, and demographic inference analysis showed that the demography of both species exhibits a clear signal of postglacial expansion. |
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1044 |
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0722-4060 |
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6458 |
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Koubbi P, Guinet C, Alloncle N, Ameziane N, Azam CS, Baudena A, Bost CA, Causse R, Chazeau C, Coste G, Cotté C, D'Ovidio F, Delord K, Duhamel G, Forget A, Gasco N, Hautecœur M, Lehodey P, Lo Monaco C, Marteau C, Martin A, Mignard C, Pruvost P, Saucède T, Sinegre R, Thellier T, Verdier AG, Weimerskirch H |
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Ecoregionalisation of the Kerguelen and Crozet islands oceanic zone. Part I: Introduction and Kerguelen oceanic zone. |
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2016 |
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37 |
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1044 |
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6459 |
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Saucède T & Marty G |
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Un observatoire des écosystèmes marins côtiers des Iles Kerguelen (Proteker). Bilan d’activités 2015 de la Réserve Naturelle Nationale des Terres Australes Françaises |
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2016 |
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44-45 |
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1044 |
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6460 |
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Charlène Guillaumot, Alexis Martin, Marc Eléaume, Thomas Saucède |
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Temporal, spatial, and sampling heterogeneities in species distribution modeling. The case study of the data-poor area of the Kerguelen Plateau. ScenNet, 23-26 août 2016, Montpellier |
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Conference - National - Communication |
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2016 |
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1044 |
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6461 |
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Claudio Gonzalez-Wevar, Angie Diaz, Mathias Hüne, Sebastian Rosenfeld, Hamish Spencer, Thomas Saucède, Karin Gerard, Elie Poulin. |
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Biogeographical patterns in southern ocean mollusks with contrasting developmental modes. 34th SCAR Open Science Conference and Biennal Meetings, 19-31 août 2016, Kuala Lumpur, Malaysia. |
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Conference - International - Communication |
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2016 |
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6462 |
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Poulin E |
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Diversification or marine benthic fauna in the Southern Ocean: A Phylogeographic and Phylogenetic Perspective. 34th SCAR Open Science Conference and Biennal Meetings, 19-31 août 2016, Kuala Lumpur, Malaysia. |
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Conference - International - Communication |
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2016 |
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1044 |
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6463 |
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Poulin E |
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Diversificación de la fauna marina y biogeografía en el Océano Austral. Primer Coloquio de Biogeografía, 13 mayo 2016, Universidad Católica del Norte, Coquimbo, Chile. |
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2016 |
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6464 |
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