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Modelling the population dynamics of Daphnia obtusa (Kurz) in Lake Orta (N. Italy) under pre- and post-liming conditions

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Abstract

A mathematical matrix model was formulated to investigate the response of Daphnia obtusa population dynamics to the changes in the water chemistry of Lake Orta before and after the liming operation. Model parameters were estimated from experimental laboratory data. Model analysis showed that water chemistry changes induced by liming affected mainly egg survival and predicted the highest population growth at pH␣6. Whereas increased egg mortality heavily inhibits population growth rate, the model still predicts a long term tendency of the population to increase in number. However, both before and after the liming operation due to high food availability in the laboratory, egg production was higher under all experimental conditions than in the field. When food limitation is accounted for and more realistic, field based estimates of egg production are used, the model predicts the extinction of D. obtusa population in the lake. This suggests that the effects of water chemistry changes on egg mortality had a critical role in the disappearance of D. obtusa from Lake Orta and may even adequately explain the extinction of this population.

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Authors and Affiliations

  1. CNR-Istituto per lo Studio degli Ecosistemi, 28922, Pallanza, VB, Italy

    Carla Bonacina

  2. Biology Department, Faculty of Science, United Arab Emirates University, P.O. Box 17551-Al-Ain, UAE

    Waleed Hamza

  3. Centro Interdipartimentale di Ricerca per le Scienze Ambientali, Università di Bologna, Via S. Alberto 163, 48100, Ravenna, RA, Italy

    Andrea Pasteris

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  1. Carla Bonacina
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  2. Waleed Hamza
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  3. Andrea Pasteris
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Correspondence to Carla Bonacina.

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Bonacina, C., Hamza, W. & Pasteris, A. Modelling the population dynamics of Daphnia obtusa (Kurz) in Lake Orta (N. Italy) under pre- and post-liming conditions. Aquat Ecol 39, 93–106 (2005). https://doi.org/10.1007/s10452-004-3855-y

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  • DOI: https://doi.org/10.1007/s10452-004-3855-y

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