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Journal of Plankton Research Vol.24 no.4 pp.321-331, 2002
© Oxford University Press 2002

Turbulence and the microbial food web: effects on bacterial losses to predation and on community structure

Francesc Peters,*, Cèlia Marrasé, Harry Havskum1,3, Fereidoun Rassoulzadegan2, John Dolan2, Miquel Alcaraz and Josep M. Gasol

Institut De Ciències Del Mar (csic), PG. Marítim De La Barceloneta 37–49, E-08003 Barcelona (catalunya), Spain; 1 The International Agency For 14C Determination, Dhi, Agern Allé 11, Dk-2970 Hørsholm, Denmark; 2 Station Zoologique, 06230 Villefranche-Sur-Mer, France

3 Present Address: Marine Biological Laboratory, University Of Copenhagen, Strandpromenaden 5, Dk-3000 Helsingør, Denmark

* Corresponding Author: Francesc PeterS. E-Mail: cesc{at}icM.CsiC.Es

Changes in picoplankton population abundance and growth under turbulence have been suggested to be the consequence of turbulence affecting larger trophic levels and hence the grazing pressure. We designed a laboratory set-up to assess the effects of turbulence on plankton assemblages, and tested the degree of food-web complexity needed to produce cascading effects on picoplankton and the interactions with nutrient enrichment. Grazing pressure on bacteria was relaxed under turbulence and we show that one trophic link is enough to produce effects at the picoplankton level. Nutrient enrichment increased the effect of turbulence as there was more biomass to act upon. The organisms responsible for driving the grazing pressure shifts could not be identified since they seemed to change depending on initial conditions and experimental treatment. A trend of increased heterotrophic biomass under turbulence was found in all cases, which can have important implications in community metabolism dynamics.


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