The spring mesozooplankton variability and its relationship with hydrobiological structure over year-to-year changes (2003–2013) in the southern Bay of Biscay (Northeast Atlantic)
|Author(s)||Dessier Aurelie1, Bustamante Paco1, Chouvelon Tiphaine2, Huret Martin3, Pagano Marc4, Marquis Elise5, Rousseaux Frederic1, Pignon-Mussaud Cecilia1, Mornet Francoise6, Breret Martine1, Dupuy Christine1|
|Affiliation(s)||1 : Univ La Rochelle, CNRS, UMR 7266, Littoral Environm & Soc LIENSs, 2 Rue Olympe Gouges, F-17042 La Rochelle 01, France.
2 : IFREMER, Unite Biogeochim & Ecotoxicol BE, LBCM, Rue Ile dYeu, F-44311 Nantes 03, France.
3 : IFREMER, Unite Sci & Technol Halieut STH, LBH, Ctr Bretagne, F-7029280 Plouzane, France.
4 : Aix Marseille Univ, CNRS IRD, UM 110, Inst Mediterraneen Oceanol MIO, Campus Luminy, F-13288 Marseille, France.
5 : URS Qatar LLC, Bin Jaham Al Kuwari Bldg,Al Saad St, Doha 22108, Qatar.
6 : IFREMER, Unite Halieut Gascogne Sud HGS, Stn La Rochelle, Pl Gaby Coll, F-17087 Lhoumeau, France.
|Source||Progress In Oceanography (0079-6611) (Pergamon-elsevier Science Ltd), 2018-09 , Vol. 166 , P. 76-87|
|WOS© Times Cited||10|
Mesozooplankton can be considered the most important secondary producers in marine food webs because they hold an intermediate position between the phytoplankton assemblage and the upper trophic levels. They also are a robust indicator of climatic and hydrological conditions. We conducted an analysis of the interannual variability of the spring mesozooplankton assemblage, as sampled by the PELGAS fisheries survey in the southern part of the Bay of Biscay (Northeast Atlantic Ocean) between 2003 and 2013. We examined hydrology and trophic drivers to explain the variability. Our results revealed that the subsurface temperature, the subsurface salinity, the biomasses of subsurface pico-, nano-, and microphytoplankton, and the copepod assemblage exhibited a recurrent spatial pattern that was driven mainly by freshwater and nutrient inputs from the main rivers. The mesozooplankton assemblage was dominated by copepods (82%), composed of coastal, neritic, and oceanic copepod genera that paralleled the various hydrological fronts converging in the southern Bay of Biscay. The copepod community displayed high temporal-variability; there were three periods of abundant adult copepods throughout the southern Bay of Biscay. The copepod community was structured primarily around the drive for resource control, especially by the microphytoplankton biomass (24.3% of the total variability), and to a lesser extent by hydrological features (13.7% of the total variability).