FN Archimer Export Format PT J TI Does Presence of a Mid-Ocean Ridge Enhance Biomass and Biodiversity? BT AF PRIEDE, Imants G. BERGSTAD, Odd Aksel MILLER, Peter I. VECCHIONE, Michael GEBRUK, Andrey FALKENHAUG, Tone BILLETT, David S. M. CRAIG, Jessica DALE, Andrew C. SHIELDS, Mark A. TILSTONE, Gavin H. SUTTON, Tracey T. GOODAY, Andrew J. INALL, Mark E. JONES, Daniel O. B. MARTINEZ-VICENTE, Victor MENEZES, Gui M. NIEDZIELSKI, Tomasz SIGUROSSON, Porsteinn ROTHE, Nina ROGACHEVA, Antonina ALT, Claudia H. S. BRAND, Timothy ABELL, Richard BRIERLEY, Andrew S. COUSINS, Nicola J. CROCKARD, Deborah HOELZEL, A. Rus HOINES, Age LETESSIER, Tom B. READ, Jane F. SHIMMIELD, Tracy COX, Martin J. GALBRAITH, John K. GORDON, John D. M. HORTON, Tammy NEAT, Francis LORANCE, Pascal AS 1:1;2:2;3:3;4:4;5:5;6:2;7:6;8:1;9:7;10:1;11:3;12:8;13:6;14:7;15:6;16:3;17:9;18:10;19:11;20:6;21:5;22:6;23:7;24:7;25:12;26:1;27:1;28:13;29:14;30:15;31:6;32:7;33:16;34:17;35:7;36:6;37:18;38:19; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:;18:;19:;20:;21:;22:;23:;24:;25:;26:;27:;28:;29:;30:;31:;32:;33:;34:;35:;36:;37:;38:PDG-RBE-EMH; C1 Univ Aberdeen, Inst Biol & Environm Sci, Oceanlab, Aberdeen, Scotland. Inst Marine Res, Flodevigen, His, Norway. Plymouth Marine Lab, Remote Sensing Grp, Plymouth, Devon, England. Smithsonian Inst, Natl Museum Nat Hist, Natl Systemat Lab, Natl Marine Fisheries Serv,NOAA, Washington, DC 20560 USA. Russian Acad Sci, PP Shirshov Inst Oceanol, Moscow, Russia. Natl Oceanog Ctr, Southampton, Hants, England. Scottish Marine Inst, Scottish Assoc Marine Sci, Oban, Argyll, Scotland. Coll William & Mary, Virginia Inst Marine Sci, Gloucester Point, VA USA. 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C2 UNIV ABERDEEN, UK INST MARINE RES FLODEVIGEN, NORWAY PML, UK NMNH SMITHSONIAN INST, USA PP SHIRSHOV OCEANOL INST, RUSSIA NOC, UK SAMS SCOTLAND, UK VIRGINIA INST MARINE SCI, USA UNIV AZORES, PORTUGAL UNIV WROCLAW, POLAND MAR RES INST, ICELAND UNIV ST ANDREWS, UK UNIV DURHAM, UK INST MARINE RES BERGEN, NORWAY UNIV WESTERN AUSTRALIA, AUSTRALIA AUSTRALIAN ANTARCTIC DIV, AUSTRALIA NOAA, USA FRS, UK IFREMER, FRANCE SI NANTES SE PDG-RBE-EMH IN WOS Ifremer jusqu'en 2018 DOAJ copubli-europe copubli-int-hors-europe IF 3.534 TC 47 UR https://archimer.ifremer.fr/doc/00135/24650/22683.pdf LA English DT Article CR PROSPEC TALUS BO Thalassa AB In contrast to generally sparse biological communities in open-ocean settings, seamounts and ridges are perceived as areas of elevated productivity and biodiversity capable of supporting commercial fisheries. We investigated the origin of this apparent biological enhancement over a segment of the North Mid-Atlantic Ridge (MAR) using sonar, corers, trawls, traps, and a remotely operated vehicle to survey habitat, biomass, and biodiversity. Satellite remote sensing provided information on flow patterns, thermal fronts, and primary production, while sediment traps measured export flux during 2007–2010. The MAR, 3,704,404 km2 in area, accounts for 44.7% lower bathyal habitat (800–3500 m depth) in the North Atlantic and is dominated by fine soft sediment substrate (95% of area) on a series of flat terraces with intervening slopes either side of the ridge axis contributing to habitat heterogeneity. The MAR fauna comprises mainly species known from continental margins with no evidence of greater biodiversity. Primary production and export flux over the MAR were not enhanced compared with a nearby reference station over the Porcupine Abyssal Plain. Biomasses of benthic macrofauna and megafauna were similar to global averages at the same depths totalling an estimated 258.9 kt C over the entire lower bathyal north MAR. A hypothetical flat plain at 3500 m depth in place of the MAR would contain 85.6 kt C, implying an increase of 173.3 kt C attributable to the presence of the Ridge. This is approximately equal to 167 kt C of estimated pelagic biomass displaced by the volume of the MAR. There is no enhancement of biological productivity over the MAR; oceanic bathypelagic species are replaced by benthic fauna otherwise unable to survive in the mid ocean. We propose that globally sea floor elevation has no effect on deep sea biomass; pelagic plus benthic biomass is constant within a given surface productivity regime. PY 2013 PD MAY SO Plos One SN 1932-6203 PU Public Library Science VL 8 IS 5 UT 000321200500009 DI 10.1371/journal.pone.0061550 ID 24650 ER EF