Zusammenfassung
In unseren bisherigen Modellen sind wir meistens davon ausgegangen, daß die Umweltbedingungen, die auf die Populationen wirken, zeitlich konstant sind. Dies steht im krassen Gegensatz zu den wirklichen Verhältnissen. Viele abiotische Umweltparameter, wie z. B. Temperatur, Licht, Niederschlag, zeigen eine Tagesund Jahresperiodik. Dazu kommen die wetterbedingten Fluktuationen. Zu den biotischen Umweltfaktoren zählen alle Organismen, die wir nicht explizit in unseren dynamischen Gleichungen berücksichtigen. Ihre zeitliche Veränderlichkeit bedingt zum Teil stark schwankende Einflüsse auf die betrachtete Populationsdynamik. Bedenken wir, daß unsere Modelle die Populationen in ihrer abiotischen und biotischen Umwelt beschreiben sollen, so müssen wir für sie zeitlich variierende Wachstumsbedingungen annehmen. Also werden die Wachstumsraten f(N), d. h. die Parameter dieser Funktionen zeitlich schwanken. In Abschn. 2.2.4 hatten wir bereits die Wirkung zufälliger Umwelteinflüsse abgeschätzt. In diesem Kapitel wollen wir auf die gesamte Problematik zeitlich variierender Bedingungen ausführlich eingehen.
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Wissel, C. (1989). Zeitliche Variabilität der Umwelt. In: Theoretische Ökologie. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74535-5_4
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