Community structure and grazing of the nano-microzooplankton on the continental shelf of the Bay of Biscay |
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| Authors: | Christine Dupuy Agathe Talarmin Hans J Hartmann Daniel Delmas C Courties Elise Marquis |
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| Institution: | 1. Laboratoire LIENSs, UMR 6250, Université de La Rochelle, Bâtiment ILE, 2 rue Olympe de Gouges, 17000 La Rochelle, France;2. Université Aix-Marseille II- CNRS/INSU UMR 6117, LMGEM, Centre d’Oceanologie de Marseille, Case 901, Campus de Luminy, F-13288 Marseille, France;3. UPMC Université Paris 06-CNRS, UMR 7621, LOMIC, Observatoire Océanologique, F-66651 Banyuls/mer, France;4. IFREMER/Centre de Brest, DYNECO, Laboratoire Pelagos, BP 70, 29280 Plouzané, France;5. Université Paris VI/ CNRS, Laboratoire Arago, BP 44, 66650 Banyuls-sur-mer, France;6. Institute of Oceanography, National Taiwan University, No. 1, Section 4, Roosevelt, 8 Road, Taipei 10617, Taiwan |
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| Abstract: | In order to investigate the parameters controlling the heterotrophic protists (nano-microzooplankton) on the continental shelf of the southern Bay of Biscay, plankton communities and their physico-chemical environment were studied 4 times in February, April, June and September–October 2004 at three stations in the euphotic zone in the Bay of Biscay. The abundance and carbon biomass of heterotrophic protists (ciliates, heterotrophic dinoflagellates and nanoflagellates) as well as all the others groups of plankton (picoplankton, nanophytoplankton, diatoms, autotrophic dinoflagellates, metazoan microzooplankton and mesozooplankton), the environmental parameters and the primary and bacteria production were evaluated at each sampling period. Microzooplankton grazing experiments were undertaken at the same time. Ciliates and heterotrophic dinoflagellates accounted for the main major component of nano- and microzooplankton communities in term of biomass. The total carbon biomass of heterotrophic protists was highest in spring and lowest at the end of summer. The development of heterotrophic protists started after a winter microphytoplankton bloom (principally large diatoms), the biomass was lower in June and was low in September (through inappropriate prey). The carbon requirement of microzooplankton ranged from 50 to more than 100% of daily primary, bacterial and nanoflagellate production. The heterotrophic protist community was predominantly constrained by bottom-up control in spring and at the end of summer via food availability and quality. |
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| Keywords: | heterotrophic protists size-fractionated phytoplankton bacteria mesozooplankton Bay of Biscay environmental factors grazing |
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