Title: Impact of Different Developmental Stages of Daphnia Magna (Straus) on the Plankton Community under Different Trophic Conditions
Authors: COMPTE JordiBRUCET SANDRAGASCÓN StephanieBOIX DaniSALA JordiLÓPEZ-FLORES RocioQUINTANA Xavier D.
Citation: HYDROBIOLOGIA vol. 635 p. 45-56
Publisher: SPRINGER
Publication Year: 2009
JRC N°: JRC53061
ISSN: 0018-8158
URI: http://www.springerlink.com
http://publications.jrc.ec.europa.eu/repository/handle/JRC53061
DOI: 10.1007/s10750-009-9860-3
Type: Articles in Journals
Abstract: In situ 24-h incubation experiments were performed to analyse the grazing effects of Daphnia magna on a planktonic microbial community. Three field grazing experiments under different nutrient concentrations were carried out on treated effluents of a wastewater treatment plant. The grazing effects of three different D. magna size classes (small (0.6¿1.6 mm), medium (1.7¿2.5 mm) and large individuals (2.6¿3.7 mm)) were compared. The different sizes classes had similar effects on the plankton community. However, our results showed big differences in effects among experiments. Our findings suggest that in spite of D. magna¿s is nonselective feeding behaviour and the fact that different developmental stages (i.e. its size) had similar effects on the microbial planktonic community, these effects can differ according to the initial structure and composition of the community and the resulting cascading trophic interactions. Moreover, D. magna effects can be direct through grazing (as is the case with ciliates), or indirect through trophic cascade interactions (as is the case with bacteria).
JRC Institute:Institute for Environment and Sustainability

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