Abstract
The population dynamics of three coexisting Daphnia species are described by means of a discrete event simulation model. The model is formulated in the algorithmic language SIMULA which allows very convenient object-oriented programming. Different compartments of a lake are simulated at different levels of integration, each represented by a PROCESS CLASS in SIMULA: The properties of the lake are deposited in a set of meteorological data which were measured in the field. Fish are simulated as a population with properties which are derived from field observations and Daphnia are represented as individuals. The model shows that hypotheses about the stabilizing mechanisms (seasonal change of environmental conditions, vertical migration of Daphnia, size selective and abundance dependent feeding of planktivorous fish) of the coexistence of the Daphnia species are sufficient to explain the stable coexistence observed.
Zusammenfassung
Die Koexistenz dreier Daphnienarten wird mit Hilfe eines objektorientierten Simulationsprogrammes beschrieben. Als Beschreibungssprache dient SIMULA, das eine sehr einfache Realisierung von parallelen Prozessen und diskreten Ereignissen ermöglicht. Die verschiedenen Kompartimente eines Sees werden auf verschiedenen Integrationsniveaus simuliert, die jeweils durch eine PROCESS CLASS in SIMULA repräsentiert werden: Der See mit seinen physikalischen und chemischen Eigenschaften wird als ein Datensatz tatsächlich im Freiland gemessener Größen realisiert. Fische werden durch eine Population dargestellt, deren Eigenschaften aus Freilandbeobachtungen bestimmt wurden. Daphnien werden als Individuen simuliert. Das Modell zeigt, daß Hypothesen über die Stabilisierungsmechanismen der Koexistenz der Daphnien (jahreszeitlicher Wechsel der Umweltbedingungen, Vertikalwanderung der Daphnien, großen- und abundanzabhängiges Fressen planktivorer Fische) ausreichen, um eine stabile Koexistenz zu ermöglichen.
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© 1991 Springer-Verlag Berlin Heidelberg
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Seitz, A. (1991). The Coexistence of Three Species of Daphnia in the Klostersee: iii. The Simulation Model Coda. In: Möller, D.P.F., Richter, O. (eds) Analyse dynamischer Systeme in Medizin, Biologie und Ökologie. Informatik-Fachberichte, vol 275. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77020-3_23
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DOI: https://doi.org/10.1007/978-3-642-77020-3_23
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