Development and validation of an individual based Daphnia magna population model: The influence of crowding on population dynamics |
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| Authors: | Thomas Günter Preuss Monika Hammers-Wirtz Udo Hommen Mascha Nadine Rubach Hans Toni Ratte |
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| Institution: | 1. Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52072 Aachen, Germany;2. Research Institute for Ecosystem Analysis and Assessment (gaiac), Worringerweg 1, 52072 Aachen, Germany;3. Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Auf dem Aberg 1, 57392 Schmallenberg, Germany;4. Alterra and Department of Aquatic Ecology and Water Quality Management, Wageningen University and Research Centre, PO Box 47, 6700 AA Wageningen, The Netherlands |
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| Abstract: | An individual-based model was developed to predict the population dynamics of Daphnia magna at laboratory conditions from individual life-history traits observed in experiments with different feeding conditions. Within the model, each daphnid passes its individual life cycle including feeding on algae, aging, growing, developing and – when maturity is reached – reproducing. The modelled life cycle is driven by the amount of ingested algae and the density of the Daphnia population. At low algae densities the population dynamics is mainly driven by food supply, when the densities of algae are high, the limiting factor is “crowding” (a density-dependent mechanism due to chemical substances released by the organisms or physical contact, but independent of food competition). |
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| Keywords: | Daphnia magna Individual-based Population Density dependence Crowding Population Structure Size distribution |
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