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JPR Advance Access originally published online on March 3, 2005
Journal of Plankton Research 2005 27(4):383-391; doi:10.1093/plankt/fbi012
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Journal of Plankton Research Vol. 27 No. 4 © Oxford University Press 2005; all rights reserved

SHORT COMMUNICATION

Microzooplankton grazing in a coastal embayment off Concepción, Chile, (~36° S) during non-upwelling conditions

Daniela Böttjer1,2 and Carmen E. Morales2,*

1 Marine Zoologie, FB 02: Biologie/Chemie, Universität Bremen, Leobenerstr., NW2A, D-28359 Bremen, Germany and 2 Centro Fondap-Copas, Departamento de Oceanografia, Universidad de Concepcion, Estacion de Biología Marina, Casilla 44, Dichato, Chile

* Corresponding Author: camorale{at}udec.cl

Received February 19, 2004; accepted in principle April 8, 2004; accepted for publication February 23, 2005; published online March 3, 2005

The impact of grazing by natural assemblages of microzooplankton was estimated in an upwelling area (Concepción, Chile) during the non-upwelling season in 2003 and 2004. Seawater dilution experiments using chlorophyll a (Chl a) as a tracer were used to estimate daily rates of phytoplankton growth and microzooplankton grazing. Initial Chl a concentrations ranged from 0.4 to 1.4 mg Chl a m–3 and phytoplankton prey biomass and abundance were numerically dominated by components <20 µm. Phytoplankton growth and microzooplankton grazing rates were 0.19–0.25 day–1 and 0.26–0.52 day –1, respectively. These results suggest that microzooplankton exert a significant removal of primary production (>100%) during the non-upwelling period.


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