Midwater fishes collected in the vicinity of the Sub-Polar Front,Mid-North Atlantic Ocean,during ECOMAR pelagic sampling |
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| Affiliation: | 1. Sorbonne Université, CNRS, IRD, MNHN, Laboratoire d''Océanographie et du Climat: Expérimentations et Approches Numériques (LOCEAN-IPSL), Paris, France;2. LEMAR, UBO-CNRS-IRD-Ifremer IUEM, Plouzané, France;3. MARBEC, Univ. Montpellier, CNRS, Ifremer, IRD, Sète, France;4. Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway;5. Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, British Columbia, Canada;6. Institute for the Oceans and Fisheries, University of British Columbia, Vancouver, British Columbia, Canada;7. Hakai Institute, PO Box 309, Heriot Bay, BC, Canada;8. BOREA, MNHN- CNRS-UPMC-IRD-UCBN-UAG, Paris, France;9. Sorbonne Université, UPMC Univ Paris 06, CNRS, Laboratoire d''Océanographie Microbienne (LOMIC), Observatoire Océanologique, Banyuls/mer, France;10. The Fredy and Nadine Herrmann Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, Israel;11. Centre d''Etudes Biologiques de Chizé (CEBC), UMR 7372 du CNRS-La Rochelle Université, 79360 Villiers-en-Bois, France;1. Géosciences Environnement Toulouse (GET), UMR CNRS, IRD, UPS, CNES, Observatoire Midi Pyrénées (OMP), 31400 Toulouse, France;2. Littoral Environnement Société (LIENSs), UMR 7266-CNRS, Université de La Rochelle, 17000 La Rochelle, France;3. Institut Universitaire de France (IUF), Paris, France;4. Centre technique de recherche et de valorisation des milieux aquatiques (CITEB), 97420 Le Port, Île de la Réunion, France;5. Institut de Recherche pour le Développement (IRD), Fishing Port, Victoria, Mahé, Seychelles;6. Sustainable Ocean Seychelles, BeauBelle, Mahé, Seychelles |
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| Abstract: | The ECOMAR project was a multidisciplinary process study conducted in the mid-North Atlantic, coincident hydrodynamically with the Sub-Polar Front (SPF; 48–54°N) and topographically with Charlie-Gibbs Fracture Zone of the Mid-Atlantic Ridge, as part of the Census of Marine Life field project MAR-ECO. Midwater trawling was conducted during the 2007 and 2009 ECOMAR expeditions at 14 stations north and south of the SPF, day and night, in four discrete depth intervals from 0 to 1000 m. A total of 56 species of midwater fishes representing 44 genera and 18 families were collected, several of which are new records for the region and/or were not previously sampled during MAR-ECO sampling. An annotated species list with depth-of-capture data is provided. Three species of the genus Cyclothone (Cyclothone braueri, Cyclothone microdon and Cyclothone pallida) and the myctophid Benthosema glaciale combined to contribute ~88% of all specimens collected. This finding differs from results of previous net-based sampling in the same area, likely due to sampling scheme differences (diel sampling, upper 800 m concentration) and gear selectivity (mesh size, trawl speed). Quantitative data from ECOMAR midwater sampling and the previous 2004 G.O. Sars MAR-ECO expedition are compared. Despite differences in gear between the major MAR-ECO expeditions, abundance estimates of some dominant species were remarkably similar. Data showed that the SPF is an asymmetrical, taxon-specific biogeographic boundary for deep-pelagic fishes in the North Atlantic; the SPF is semi-permeable to some species in one direction, while a strong boundary for species in another direction. Deeper-living fish species did not appear as affected by the SPF as a boundary. |
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| Keywords: | Mesopelagic zone Vertical distribution Biogeography Mid-Ocean Ridges North Atlantic Ocean |
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