Deep-sea macrofaunal assemblages within the Benthic Boundary Layer of the Cap-Ferret Canyon (Bay of Biscay,NE Atlantic) |
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| Institution: | 1. A.V. Zhirmunsky Institute of Marine Biology, National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, 17 Palchevskogo St, Vladivostok 690041, Russia;2. Far Eastern Federal University, Ajax St., Russky Island, Vladivostok 690600, Russia;1. Graduate School of Fisheries Sciences, Hokkaido University, 3–1–1 Minatomachi, Hakodate, Hokkaido 041–8611, Japan;2. Marine Bioscience, Kitasato University, 1–15–1, Kitasato, Minami, Sagamihara, Kanagawa 252–0373, Japan;3. Atmosphere and Ocean Research Institute, The University of Tokyo, 5–1–5, Kashiwanoha, Kashiwa–shi, Chiba 277–8564, Japan;4. National Institute of Polar Research, 10–3, Midoricho, Tachikawa, Tokyo 190–8518, Japan;5. Graduate School of Frontier Sciences, The University of Tokyo, 5–1–5 Kashiwanoha, Kashiwa, Chiba 277–8564, Japan;1. National Scientific Center of Marine Biology, Far Eastern Branch of Russian Academy of Sciences, Vladivostok 690041, Russia;2. Far Eastern Federal University, Vladivostok 690950, Russia;1. Institut de Ciències del Mar (ICM-CSIC), Departament Oceanografìa Fìsica i Tecnològica, 37-49, 08003, Barcelona, Spain;2. Instituto Dom Luiz, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Edifício C8, 1749-016 Lisboa, Portugal;3. MARE – Marine and Environmental Sciences Centre, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal;4. Instituto Português do Mar e Atmosfera, 1449-006 Lisboa, Portugal;5. MARE – Marine and Environmental Sciences Centre, Laboratório de Ciências do Mar, Universidade de Évora, Apartado 190, 7521-903 Sines, Portugal;6. Departamento de Biologia, Escola de Ciências e Tecnologia, Universidade de Évora, Portugal;1. A.V. Zhirmunsky Institute of Marine Biology of the Far Eastern Branch of the Russian Academy of Sciences, Vladivostok 690041, Russia;2. Zoological Institute and Zoological Museum, Biocenter Grindel, University of Hamburg, Martin-Luther-King-Platz 3, 20146 Hamburg, Germany;3. Institute for Hydrobiology and Fisheries Science, University of Hamburg, Große Elbstraße 133, 22767 Hamburg, Germany;4. Far Eastern Federal University, Vladivostok 690950, Russia;5. Pacific Research Fisheries Centre (TINRO-Centre), Vladivostok 690950, Russia |
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| Abstract: | The Benthic Boundary Layer (BBL) assemblages from the Cap-Ferret Canyon (Bay of Biscay) were quantitatively sampled at two sites located within its main channel near mooring deployments (Mooring Sites MS 1: ca. 2400 m; MS 2: ca. 3000 m) with a suprabenthic sled equipped with four nets fishing at different heights above the bottom. The macrofaunal abundance above the sea-floor was mainly represented by Isopoda (42.2%), Amphipoda (19.0%), Euphausiacea (17.3%), Cumacea (13.5%), Mysidacea (2.8%) and Tanaidacea (2.6%). At both sampling sites, the highest total densities were generally recorded in the immediate vicinity of the sea floor (10–40 cm water layer), and a drastic decrease occurred higher in the BBL community. The BBL assemblages from the two sampling sites were similar in their faunal composition (major taxa), and their mean density estimates were not statistically different (MS 1 : 525.3 ind. 100 m?2; MS 2 : 283.3 ind. m?2) although the recorded values during each cruise were always lower at the deeper site. The BBL macrofauna abundance showed obvious temporal fluctuations at both sites, probably linked with a seasonal organic input from the euphotic zone (vertical flux) via phytodetritus deposition on the sea bottom. |
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