Journal
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
Volume 56, Issue 5, Pages 703-715Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr.2008.11.008
Keywords
AARS; Bio-physical interaction; Calanus finmarchicus; Enzyme activity; Growth; Labrador Sea; Zooplankton; Production
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Funding
- Spanish Ministry of Education, Culture and Sport [EX-2002-0456]
- NERC Marine Productivity Thematic Programme [NER/T/S/2001/01256, NE/C508418/1]
- European Social Fund
- NERC [pml010004] Funding Source: UKRI
- Natural Environment Research Council [pml010004] Funding Source: researchfish
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Surface distribution (0-100 m) of zooplankton biomass and specific aminoacyl-tRNA synthetases (AARS) activity, as a proxy of structural growth, were assessed during winter 2002 and spring 2004 in the Labrador Sea. Two fronts formed by strong boundary currents, several anticyclonic eddies and a cyclonic eddy were studied. The spatial contrasts observed in seawater temperature, salinity and fluorescence, associated with those mesoscale structures, affected the distributions of both zooplankton biomass and specific AARS activity, particularly those of the smaller individuals. Production rates of large organisms (200-1000 mu m) were significantly related to microzooplankton biomass (63-200 mu m), suggesting a cascade effect from hydrography through microzooplankton to large zooplankton. Water masses defined the biomass distribution of the three dominant species: Calanus glacialis was restricted to cold waters on the shelves while Calanus hyperboreus and Calanus finmarchicus were widespread from Canada to Greenland. Zooplankton production was up to ten-fold higher inside anticyclonic eddies than in the surrounding waters. The recent warming tendency observed in the Labrador Sea will likely generate weaker convection and less energetic mesoscale eddies. This may lead to a decrease in zooplankton growth and production in the Labrador basin. (C) 2009 Elsevier Ltd. All rights reserved.
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