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Author |
Hemery L G, Eleaume M, Roussel V, Ameziane N, Gallut C, Steinke D, Cruaud C, Couloux- A, Wilson N G, |
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Title |
Comprehensive sampling reveals circumpolarity and sympatry in seven mitochondrial lineages of the Southern Ocean crinoid species Promachocrinus kerguelensis (Echinodermata)
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Journal Article |
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Year |
2012 |
Publication |
MOLECULAR ECOLOGY |
Abbreviated Journal |
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Volume |
21 |
Issue |
10 |
Pages |
2502-2518 |
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Keywords |
Antarctica; crinoid; cryptic species; gene flow; haplotype diversity; refugia, |
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Abstract |
Sampling at appropriate spatial scales in the Southern Ocean is logistically challenging and may influence estimates of diversity by missing intermediate representatives. With the assistance of sampling efforts especially influenced by the International Polar Year 2007 similar to 2008, we gathered nearly 1500 specimens of the crinoid species Promachocrinus kerguelensis from around Antarctica. We used phylogeographic and phylogenetic tools to assess its genetic diversity, demographic history and evolutionary relationships. Six phylogroups (A similar to F) identified in an earlier study are corroborated here, with the addition of one new phylogroup (E2). All phylogroups are circumpolar, sympatric and eurybathic. The phylogeny of Promachocrinus phylogroups reveals two principal clades that may represent two different cryptic species with contrasting demographic histories. Genetic diversity indices vary dramatically within phylogroups, and within populations, suggesting multiple glacial refugia in the Southern Ocean: on the Kerguelen Plateau, in the East Weddell Sea and the South Shetland Islands (Atlantic sector), and on the East Antarctic continental shelf in the Dumont dUrville Sea and Ross Sea. The inferences of gene flow vary among the phylogroups, showing discordant spatial patterns. Phylogroup A is the only one found in the Sub-Antarctic region, although without evident connectivity between Bouvet and Kerguelen populations. The Scotia Arc region shows high levels of connectivity between populations in most of the phylogroups, and barriers to gene flow are evident in East Antarctica.
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WILEY-BLACKWELL |
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0962-1083 |
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4076 |
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Author |
De Broyer Claude, Danis Bruno, |
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Title |
How many species in the Southern Ocean? Towards a dynamic inventory of the Antarctic marine species
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Journal Article |
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Year |
2011 |
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DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY |
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Volume |
58 |
Issue |
1-2 |
Pages |
5-17 |
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Keywords |
Antarctic, Barcoding, Biodiversity, Cybertaxonomy, Information system, Southern Ocean, Species inventory, Taxonomy, |
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1044 |
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Bachelor's thesis |
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0967-0645 |
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4225 |
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Title |
Ectosymbiosis associated with cidaroids (Echinodermata: Echinoidea) promotes benthic colonization of the seafloor in the Larsen Embayments, Western Antarctica
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Journal Article |
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2011 |
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DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY |
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58 |
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1-2 |
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84-90 |
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Keywords |
Antarctica, Cidaroid echinoids, Diversity, Larsen embayments, Symbiosis, |
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1044 |
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Bachelor's thesis |
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0967-0645 |
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yes |
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4226 |
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Title |
Environmental control on the structure of echinoid assemblages in the Bellingshausen Sea (Antarctica)
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Journal Article |
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Year |
2012 |
Publication |
POLAR BIOLOGY |
Abbreviated Journal |
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Volume |
35 |
Issue |
9 |
Pages |
1343-1357 |
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Keywords |
Abiotic factors, Antarctic, Bellingshausen Sea, Benthos, Diversity, Echinodermata, Echinoidea, Ecology, Microbiology, Oceanography, Plant Sciences, Zoology, |
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1044 |
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Bachelor's thesis |
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0722-4060 |
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yes |
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4237 |
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Title |
Antarctic, Sub-Antarctic and cold temperate echinoid database
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Journal Article |
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Year |
2012 |
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ZOOKEYS |
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Volume |
204 |
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47-52 |
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1044 |
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Bachelor's thesis |
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1313-2989 |
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yes |
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4238 |
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Title |
Correlative and dynamic species distribution modelling for ecological predictions in the Antarctic: a cross-disciplinary concept
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Journal Article |
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Year |
2012 |
Publication |
POLAR RESEARCH |
Abbreviated Journal |
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Volume |
31 |
Issue |
110091 |
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1044 |
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Bachelor's thesis |
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0800-0395 |
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yes |
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4240 |
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Title |
Divergence time estimations and contrasting patterns of genetic diversity between Antarctic and southern South America benthic invertebrates
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Journal Article |
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Year |
2012 |
Publication |
Revista chilena de historia natural |
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0716-078X |
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Volume |
85 |
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445-456 |
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1044 |
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0716-078X |
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yes |
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4242 |
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Title |
Restricted geographic distribution and low genetic diversity of the brooding sea urchin Abatus agassizii (Spatangoidea: Schizasteridae) in the South Shetland Islands: A bridgehead population before the spread to the northern Antarctic Peninsula?
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Journal Article |
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Year |
2012 |
Publication |
Revista chilena de historia natural |
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Volume |
85 |
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457-468 |
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1044 |
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Bachelor's thesis |
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0716-078X |
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yes |
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4244 |
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Title |
Towards a model of postglacial biogeography in shallow marine species along the Patagonian Province: lessons from the limpet Nacella magellanica (Gmelin, 1791)
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Type |
Journal Article |
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Year |
2012 |
Publication |
BMC EVOLUTIONARY BIOLOGY |
Abbreviated Journal |
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Volume |
12 |
Issue |
1 |
Pages |
1-17 |
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Keywords |
Animal Systematics/Taxonomy/Biogeography, Asymmetric gene flow, Cape horn current, Entomology, Evolutionary Biology, Expansion-contraction model, Falkland/Malvinas Islands, Genetics and Population Dynamics, Larval dispersal, Last glacial maximum, Life Sciences, general, Nacella magellanica, Patagonian Province, Post-glacial recolonization, Quaternary, |
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Abstract |
Background Patagonia extends for more than 84,000 km of irregular coasts is an area especially apt to evaluate how historic and contemporary processes influence the distribution and connectivity of shallow marine benthic organisms. The true limpet Nacella magellanica has a wide distribution in this province and represents a suitable model to infer the Quaternary glacial legacy on marine benthic organisms. This species inhabits ice-free rocky ecosystems, has a narrow bathymetric range and consequently should have been severely affected by recurrent glacial cycles during the Quaternary. We performed phylogeographic and demographic analyses of N. magellanica from 14 localities along its distribution in Pacific Patagonia, Atlantic Patagonia, and the Falkland/Malvinas Islands. Results Mitochondrial (COI) DNA analyses of 357 individuals of N. magellanica revealed an absence of genetic differentiation in the species with a single genetic unit along Pacific Patagonia. However, we detected significant genetic differences among three main groups named Pacific Patagonia, Atlantic Patagonia and Falkland/Malvinas Islands. Migration rate estimations indicated asymmetrical gene flow, primarily from Pacific Patagonia to Atlantic Patagonia (Nem=2.21) and the Falkland/Malvinas Islands (Nem=16.6). Demographic reconstruction in Pacific Patagonia suggests a recent recolonization process (< 10 ka) supported by neutrality tests, mismatch distribution and the median-joining haplotype genealogy. Conclusions Absence of genetic structure, a single dominant haplotype, lack of correlation between geographic and genetic distance, high estimated migration rates and the signal of recent demographic growth represent a large body of evidence supporting the hypothesis of rapid postglacial expansion in this species in Pacific Patagonia. This expansion could have been sustained by larval dispersal following the main current system in this area. Lower levels of genetic diversity in inland sea areas suggest that fjords and channels represent the areas most recently colonized by the species. Hence recolonization seems to follow a west to east direction to areas that were progressively deglaciated. Significant genetic differences among Pacific, Atlantic and Falkland/Malvinas Islands populations may be also explained through disparities in their respective glaciological and geological histories. The Falkland/Malvinas Islands, more than representing a glacial refugium for the species, seems to constitute a sink area considering the strong asymmetric gene flow detected from Pacific to Atlantic sectors. These results suggest that historical and contemporary processes represent the main factors shaping the modern biogeography of most shallow marine benthic invertebrates inhabiting the Patagonian Province. |
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1471-2148 |
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4245 |
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Author |
Maturana C. & E. Poulin |
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Title |
Reproduction Strategies in Antarctica: Reproductive seasonality and mating system in the brooding sea urchin, Abatus agassizii (Mortensen 1910) |
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Conference - International - Poster |
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2012 |
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1044 |
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4247 |
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