Journal
MARINE BIOLOGY
Volume 158, Issue 6, Pages 1187-1210Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00227-011-1679-6
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Funding
- French Institute for the Exploitation of the Sea (Ifremer)
- HERMES and HERMIONE European projects [511234, 226354]
- ANR DEEP-OASES [ANR06BDV005]
- GDR ECCHIS
- DFG [M70-2]
- Max Planck Society
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The Nile Deep-Sea Fan (NDSF) is located on the passive continental margin off Egypt and is characterized by the occurrence of active fluid seepage such as brine lakes, pockmarks and mud volcanoes. This study characterizes the structure of faunal assemblages of such active seepage systems of the NDSF. Benthic communities associated with reduced, sulphidic microhabitats such as sediments and carbonate crusts were sampled by remotely operated vehicles during two cruises in 2006 (BIONIL) and 2007 (MEDECO). Environmental conditions and biological factors including family-level faunal composition, density and diversity were measured at local and regional scales. Significant differences were detected at different spatial scales: (1) the fauna of reduced habitats differed substantially in activity, diversity and biomass from the non-seep environment at similar water depth, (2) cold seep microhabitats showed differences in community structure and composition related to substratum type as well as to the intensity and location of fluid emissions.
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