FN Archimer Export Format
PT J
TI First insights into the structure and environmental setting of cold-seep communities in the Marmara Sea
BT 
AF RITT, Benedicte
   SARRAZIN, Jozee
   CAPRAIS, Jean-Claude
   NOEL, Philippe
   GAUTHIER, Olivier
   PIERRE, Catherine
   HENRY, Pierre
   DESBRUYERES, Daniel
AS 1:1;2:1;3:1;4:1;5:1,2;6:3;7:4;8:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 IFREMER, Ctr Brest, DEEP LEP, F-29280 Plouzane, France.
   Univ Bretagne Occidentale, IUEM, LEMAR, UMR 6539, F-29280 Plouzane, France.
   Univ Paris 06, LOCEAN UMR 7159, F-75252 Paris, France.
   Chaire Geodynam Coll France, CEREGE, F-13545 Aix En Provence 04, France.
C2 IFREMER, FRANCE
   UBO, FRANCE
   UNIV PARIS 06, FRANCE
   COLL FRANCE, FRANCE
SI BREST
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.372
TC 62
TU Aix-Marseille université
   Centre national de la recherche scientifique
   Collège de France
   Institut de recherche pour le développement
   Institut français de recherche pour l'exploitation de la mer
   Muséum national d'histoire naturelle
   Service Hydrographique et Océanographique de la Marine
   Université Pierre et Marie Curie
   Université de Bretagne Occidentale
   Université de Bretagne-Sud
UR https://archimer.ifremer.fr/doc/00014/12506/9528.pdf
LA English
DT Article
CR MARMARASCARPS
   MARNAUT
BO L'Atalante
DE ;Marmara Sea;Cold seep;Benthic fauna;Biological diversity;Environmental conditions;Chemosynthetic
AB A brackish-water cold seep on the North Anatolian Fault (NAF) in the Marmara Sea was investigated with the Nautile submersible during the MarNaut cruise in 2007. This active zone has already been surveyed and revealed evidence of active seeping on the seafloor, such as bubble emissions, patches of reduced sediments, microbial mats and authigenic carbonate crusts. MarNaut was the first opportunity to sample benthic communities in the three most common microhabitats (bioturbated and reduced sediments, carbonate crust) and to examine their relationships with environmental conditions. To do so, faunal communities were sampled and chemical measurements were taken close to the organisms. According to diversity indices, the bioturbated microhabitat exhibited the highest taxonomic diversity and evenness despite a lower number of samples. Conversely, the reduced sediment microhabitat exhibited the lowest taxonomic diversity and evenness. The carbonate crust microhabitat was intermediate although it had the highest biomass. Multivariate analyses showed that (1) fauna were relatively similar within a single microhabitat; (2) faunal community structure varied greatly between the different microhabitats; (3) there was a link between faunal distribution and the type of substratum; and (4) chemical gradients (i.e. methane, oxygen and probably sulphides) may influence faunal distribution. The estimated fluid flow velocity (0.4-0.8 m/yr) confirmed the presence of fluid emission and provided evidence of seawater convection in the two soft-sediment microhabitats. Our results suggest that the reduced sediments may represent a harsher environment with high upward fluid flow, which restrains seawater from penetrating the sediments and inhibits sulphide production, whereas bioturbated sediments can be viewed as a bio-irrigated system with sulphide production occurring at greater depths. Therefore, the environmental conditions in reduced sediments appear to prevent the colonization of symbiont-bearing fauna, such as vesicomyid bivalves, which are more often found in bioturbated sediments. Fluid flow appears to control sulphide availability, which in turn influences the horizontal and vertical distribution patterns of fauna at small spatial scales as observed at other seep sites.
PY 2010
PD SEP
SO Deep-sea Research Part I-oceanographic Research Papers
SN 0967-0637
PU Pergamon-elsevier Science Ltd
VL 57
IS 9
UT 000281929900007
BP 1120
EP 1136
DI 10.1016/j.dsr.2010.05.011
ID 12506
ER

EF