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Modelling the effects of temperature and food on individual growth and reproduction of Daphnia and their consequences on the population level

Modelling the effects of temperature and food on individual growth and reproduction of Daphnia and their consequences on the population level

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RINKE, Karsten, Thomas PETZOLDT, 2003. Modelling the effects of temperature and food on individual growth and reproduction of Daphnia and their consequences on the population level. In: Limnologica - Ecology and Management of Inland Waters. 33(4), pp. 293-304. ISSN 0075-9511. Available under: doi: 10.1016/S0075-9511(03)80024-5

@article{Rinke2003Model-17767, title={Modelling the effects of temperature and food on individual growth and reproduction of Daphnia and their consequences on the population level}, year={2003}, doi={10.1016/S0075-9511(03)80024-5}, number={4}, volume={33}, issn={0075-9511}, journal={Limnologica - Ecology and Management of Inland Waters}, pages={293--304}, author={Rinke, Karsten and Petzoldt, Thomas} }

Petzoldt, Thomas Individual based simulations of population dynamics require the availability of growth models with adequate complexity. For this purpose a simple-to-use model (non-linear multiple regression approach) is presented describing somatic growth and reproduction of Daphnia as a function of time, temperature and food quantity. The model showed a good agreement with published observations of somatic growth (r<sup>2</sup> = 0.954, n = 88) and egg production (r<sup>2</sup> = 0.898, n = 35). Temperature is the main determinant of initial somatic growth and food concentration is the main determinant of maximal body length and clutch size. An individual based simulation was used to demonstrate the simultaneous effects of food and temperature on the population level. Evidently, both temperature and food supply affected the population growth rate but at food concentrations above approximately 0.4 mg Cl<sup>−1</sup> Scenedesmus acutus temperature appeared as the main determinant of population growth.<br /><br />Four simulation examples are given to show the wide applicability of the model: (1) analysis of the correlation between population birth rate and somatic growth rate, (2) contribution of egg development time and delayed somatic growth to temperature-effects on population growth, (3) comparison of population birth rate in simulations with constant vs. decreasing size at maturity with declining food concentrations and (4) costs of diel vertical migration. Due to its plausible behaviour over a broad range of temperature (2–20 °C) and food conditions (0.1–4 mg Cl<sup>−1</sup>) the model can be used as a module for more detailed simulations of Daphnia population dynamics under realistic environmental conditions. deposit-license eng Rinke, Karsten Publ. in: Limnologica : ecology and management of inland waters ; 33 (2003), 4. - S. 293-304 Rinke, Karsten 2012-02-02T16:13:27Z Petzoldt, Thomas 2012-02-02T16:13:27Z 2003 Modelling the effects of temperature and food on individual growth and reproduction of Daphnia and their consequences on the population level

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