Influence of near-bottom environmental conditions on the structure of bathyal macrobenthic crustacean assemblages from the Capbreton canyon (Bay of Biscay,NE Atlantic) |
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| Affiliation: | 1. Sociedad Cultural INSUB, Zemoria 12, Apdo. 3223, 20013 Donostia-San Sebastian, Spain;2. Laboratoire d''océanographie biologique (UMR 5805, CNRS/UB1), 2 rue Jolyet, 33120 Arcachon, France;1. Zoological Museum Hamburg, Center of Natural History, University of Hamburg, Martin-Luther-King-Platz 3, 20146 Hamburg, Germany;2. Ghent University, Marine Biology Department, Krijgslaan 281/S8, 9000 Gent, Belgium;3. German Centre for Marine Biodiversity Research, Senckenberg research institutes and museums (SFN), Martin-Luther-King-Platz 3, 20146 Hamburg, Germany;1. Norwegian Institute for Water Research, Region South, Jon Lilletuns vei 3, NO-4879 Grimstad, Norway;2. Norwegian University of Science and Technology, NTNU University Museum, NO-7491 Trondheim, Norway;3. University Museum of Bergen, University of Bergen, PO Box 7800, NO-5020 Bergen, Norway;2. Far Eastern Federal University, Vladivostok, Russian Federation;1. Tohoku National Fisheries Research Institute, Fisheries Research Agency, 3-27-5 Shinhama-cho, Shiogama, Miyagi 985-0001, Japan;2. Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8564, Japan;3. Graduate School of Agricultural Science, Tohoku University, Sendai 981-8555, Japan |
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| Abstract: | Sled and box-corer samplings were performed at two sites in the Capbreton canyon in order to appreciate the influence of near-bottom environmental conditions on the structure of their macrobenthic communities (crustaceans). Although located at similar depths (ca. 1 000 m), these two sites were characterised by different physicochemical conditions at the sediment-water interface, probably related with the morphology of the submarine valley (reduced environment, oxygen depletion and stagnation of bottom water at site A; normal oceanic conditions on the near-bottom environment of site B). The analysis of the collected fauna revealed a low similarity between the two sites, mainly due to the unusual dominance of three epibenthic species in sled samples from site A: the amphipod Bonnierella abyssorum, the tanaid Apseudes spinosus and the isopod Arcturopsis giardi. Due to their apparent rarity or absence in adjacent non-canyon communities, such epibenthic crustaceans may be considered as `canyon indicator species' able to exhibit abundant populations within the peculiar confinement area of this canyon. |
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