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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Maud Rise - a snapshot through the water column
Deep-Sea Research Part II: Topical Studies in Oceanography, Volume 58, No. 19-20, Year 2011
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Description
The benthic fauna was investigated during the expedition ANT-XXIV/2 (2007/08) in relation to oceanographic features, biogeochemical properties and sediment characteristics, as well as the benthic, pelagic and air-breathing fauna. The results document that Maud Rise (MR) differs distinctly from surrounding deep-sea basins investigated during previous Southern Ocean expeditions (ANDEEP 2002, 2005). Considering all taxa, the overall similarity between MR and adjacent stations was low (~20% Bray-Curtis-Similarity), and analyses of single taxa show obvious differences in species composition, abundances and densities. The composition and diversity of bivalves of MR are characterised by extremely high abundances of three species, especially the small sized Vesicomya spp. Exceptionally high gastropod abundance at MR is due to the single species Onoba subantarctica wilkesiana, a small brooder that may prey upon abundant benthic foraminiferas. The abundance and diversity of isopods also show that one family, Haplomunnidae, occurs with a surprisingly high number of individuals at MR while this family was not found at any of the 40 bathyal and abyssal ANDEEP stations. Similarly, polychaetes, especially the tube-dwelling, suspension-feeder fraction, are represented by species not found at the comparison stations. Sponges comprise almost exclusively small specimens in relatively high numbers, especially a few species of Polymastiidae. Water-column sampling from the surface to the seafloor, including observations of top predators, indicate the existence of a prospering pelagic food web. Local concentrations of top predators and zooplankton are associated with a rich ice-edge bloom located over the northern slope of MR. There the sea ice melts, which is probably accelerated by the advection of warm water at intermediate depth. Over the southern slope, high concentrations of Antarctic krill (Euphausia superba) occur under dense sea ice and attract Antarctic Minke Whales (Balaenoptera bonaerensis) and several seabird species. These findings suggest that biological prosperity over MR is related to both oceanographic and sea-ice processes. Downward transport of the organic matter produced in the pelagic realm may be more constant than elsewhere due to low lateral drift over MR. © 2011 Elsevier Ltd.
Authors & Co-Authors
Brandt, Angelika
Germany, Hamburg
Universität Hamburg
Bathmann, Ulrich V.
Germany, Bremerhaven
Alfred-wegener-institut Helmholtz-zentrum Für Polar- Und Meeresforschung
Brix, Saskia
Unknown Affiliation
Cisewski, Boris
Germany, Bremerhaven
Alfred-wegener-institut Helmholtz-zentrum Für Polar- Und Meeresforschung
Flores, Hauke
Netherlands, Wageningen
Wageningen University & Research
Janussen, Dorte
Germany, Frankfurt am Main
Senckenberg Forschungsinstitut Und Naturmuseum
Krägefsky, Sören
Germany, Bremerhaven
Alfred-wegener-institut Helmholtz-zentrum Für Polar- Und Meeresforschung
Leach, Harry
United Kingdom, Liverpool
University of Liverpool
Linse, K. T.
United Kingdom, Swindon
Natural Environment Research Council
Pakhomov, Evgeny A.
Canada, Vancouver
The University of British Columbia
Peeken, Ilka
Germany, Bremerhaven
Alfred-wegener-institut Helmholtz-zentrum Für Polar- Und Meeresforschung
Germany, Bremen
Universität Bremen
Sauter, Eberhard J.
Germany, Bremerhaven
Alfred-wegener-institut Helmholtz-zentrum Für Polar- Und Meeresforschung
Sachs, Oliver
Germany, Bremerhaven
Alfred-wegener-institut Helmholtz-zentrum Für Polar- Und Meeresforschung
Schrödl, Michael
Germany, Munich
Zoologische Staatssammlung München
Schwabe, Enrico
Germany, Munich
Zoologische Staatssammlung München
Strass, Volker H.
Germany, Bremerhaven
Alfred-wegener-institut Helmholtz-zentrum Für Polar- Und Meeresforschung
van Franeker, Jan Andries
Netherlands, Wageningen
Wageningen University & Research
Statistics
Citations: 42
Authors: 17
Affiliations: 10
Identifiers
Doi:
10.1016/j.dsr2.2011.01.008
ISSN:
09670645
Research Areas
Environmental
Food Security