Microzooplankton herbivory during the diatom-Phaeocystis spring - Archive ouverte HAL
Article Dans Une Revue Journal of Experimental Marine Biology and Ecology Année : 2011

Microzooplankton herbivory during the diatom-Phaeocystis spring

Résumé

The dilution technique was used to investigate microzooplankton grazing and phytoplankton growth in the eastern English Channel during the diatom-Phaeocystisspring succession from January 2009 to June 2009. Four periods were defined based on phytoplankton composition: Periods 1, 2 and 4 composed of distinct diatom communities of small (5-20 μm length) to larger cells (20-120 μm) in colonies; Period 3 characterized by the Phaeocystis globosa bloom. Dilution experiments were conducted before, during and after the P. globosa bloom. Microzooplankton carbon consumption (from 18.1 to 360.9 μg C L− 1 d− 1) often equalled or exceeded phytoplankton production (from 1.7 to 129.0 μg C L− 1 d− 1) in particular at the end of the P. globosa bloom when microzooplankton grazed on previously formed phytoplankton biomass. Results of size-fractionated dilution experiments, conducted with distinct grazer communities, suggested different roles for ciliates and dinoflagellates. Ciliates appeared to be very efficient grazers of small diatoms (5-10 μm) and P. globosa free cells, whereas dinoflagellates grazed on both larger diatoms (> 10 μm; P1) and small P. globosa colonies. Ciliates and dinoflagellates did not seem to compete for food resources, as they were oriented towards different phytoplankton size classes. --------------------------------------------------------------------------------

Domaines

Océanographie

Dates et versions

hal-00758283 , version 1 (28-11-2012)

Identifiants

Citer

J.-D. Grattepanche, Dorothée Vincent, Elsa Breton, Urania Christaki. Microzooplankton herbivory during the diatom-Phaeocystis spring. Journal of Experimental Marine Biology and Ecology, 2011, 404, pp.87-97. ⟨10.1016/j.jembe.2011.04.004⟩. ⟨hal-00758283⟩
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