Search results for "Weddell Sea"
showing 4 items of 4 documents
Ectosymbiosis is a critical factor in the local benthic biodiversity of the Antarctic deep sea.
2008
10 pages; International audience; In deep-sea benthic environments, competition for hard substrates is a critical factor in the distribution and diversity of organisms. In this context, the occurrence of biotic substrates in addition to mineral substrates may change the characteristics of sessile fauna. We tested this hypothesis at different localities of the Weddell Sea (Antarctica) by studying the diversity of ectosymbionts living on the spines of cidaroids (echinoids). The presence of cidaroids promoted a higher total specific richness and increased sessile species abundance, but did not change the diversity. Analyses of species distribution suggested that the cidaroids are a favourable …
Biodiversity change after climate-induced ice-shelf collapse in the Antarctic
2011
Julian Gutt ... et al. -- 10 pages, 5 figures, 1 table, supplementary data https://doi.org/10.1016/j.dsr2.2010.05.024
Sea ice extent and seasonality for the Early Pliocene northern Weddell Sea
2010
Abstract Growth increment analysis coupled with stable isotopic data ( δ 18 O/ δ 13 C) from Early Pliocene (ca 4.7 Ma) Austrochlamys anderssoni from shallow marine sediments of the Cockburn Island Formation, northern Antarctic Peninsula, suggest these bivalves grew through much of the year, even during the coldest parts of winter recorded in the shells. The high frequency fluctuation in growth increment width of A. anderssoni appears to reflect periodic, but year-round, agitation of the water column enhancing benthic food supply from organic detritus. This suggests that Austrochlamys favoured waters that were largely sea ice free. Our data support interpretation of the Cockburn Island Forma…
Diversity, ecology and biogeography of Antarctic benthic hydrozoans: the Weddell Sea and the Scotia Arc as study cases
2017
Introducció: Les comunitats bentòniques que es desenvolupen a les aigües antàrtiques són altament singulars com a resultat d’un ambient relativament estable i aïllat. Tal aïllament és degut, entre altres factors, a la presència de la convergència Antàrtica, una forta barrera (o filtre) de temperatura i salinitat, que circumscriu de forma efectiva un dels ecosistemes marins més discrets i isolats geogràficament. Els factors abans esmentats han jugat un paper important en el desenvolupament d'un dels ecosistemes més rics del món pel que respecta a diversitat de fauna marina sèssil. Així doncs, la plataforma Antàrtica, més profunda que qualsevol altra plataforma continental, està constituïda p…