Diversity and species distribution of polychaetes,isopods and bivalves in the Atlantic sector of the deep Southern Ocean |
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Authors: | Kari E Ellingsen Angelika Brandt Brigitte Ebbe Katrin Linse |
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Institution: | 1.Norwegian Institute for Nature Research (NINA), Polar Environmental Centre,Troms?,Norway;2.Zoological Museum,University of Hamburg,Hamburg,Germany;3.DZMB-CeDAMar c/o Zoologisches Forschungsmuseum K?nig,Bonn,Germany;4.British Antarctic Survey,Natural Environmental Research Council,Cambridge,UK |
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Abstract: | We examined deep-sea benthic data on polychaetes, isopods and bivalves from the Atlantic sector of the Southern Ocean. Samples
were taken during the expeditions EASIZ II (1998), ANDEEP I and II (2002) (depth: 742–6,348 m). The range between sites varies
from 3 to 1,900 km. Polychaetes (175 species in total) and isopods (383 species) had a high proportion of species restricted
to one or two sites (72 and 70%, respectively). Bivalves (46 species) had a higher proportion of species represented at more
sites. Beta diversity (Whittaker and Jaccard) was higher for polychaetes and isopods than for bivalves. The impact of depth
on species richness was not consistent among groups; polychaetes showed a negative relationship to depth, isopods displayed
highest richness in the middle depth range (2,000–4,000 m), whereas bivalves showed no clear relationship to depth. Species
richness was not related to latitude (58–74°S) or longitude (22–60°W) for any group. |
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