In situ filtration responses of Daphnia galeata to changes in food quality |
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Authors: | Darchambeau, Francois Thys, Isabelle |
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Affiliation: | 1 Facultés Universitaires Notre-Dame de La Paix, Urbo Laboratory of Freshwater Ecology, Rue de Bruxelles 61, B-5000 Namur, Belgium and 2 Crp-Gabriel Lippmann, Crebs, Avenue de La Faïencerie 162A, L-1511 Luxembourg, Luxembourg Present Address: Université Du Québec À Trois-Rivières, Grea, CP 500, TRois-Rivières, Québec, Canada G9A 5H7 |
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Abstract: | In the stoichiometric study of phytozooplankton interactions,a controversy exists about how Daphnia species regulate theirfeeding rate when submitted to low-quality food (i.e. high dietarycarbon:phosphorus [C:P] ratio). In this study, we gathered dataover 3 years on in situ clearance rates of a Daphnia galeatapopulation, by conducting grazing experiments from April 1998to October 2000 in the Esch-sur-Sûre reservoir (Grand-Duchyof Luxembourg). Observed clearance rates (2.513.5 mLindividual1 day1, mean 7.0 mL individual1day1) were correlated with population and environmentalvariables. Mean body size of Daphnia individuals was the bestpredictor of clearance rate (r2 = 0.639), followed by watertemperature (r2 = 0.262) and P concentration in the seston (r2 |
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