Effects of Nutrient Recycling and Food-Chain Length on Resilience
| Autor: | D. L. DeAngelis, S. M. Bartell, A. L. Brenkert |
|---|---|
| Rok vydání: | 1989 |
| Předmět: | |
| Zdroj: | The American Naturalist. 134:778-805 |
| ISSN: | 1537-5323 0003-0147 |
| DOI: | 10.1086/285011 |
| Popis: | Food-web resilience, or the rate at which a food web returns to steady state following a perturbation, was investigated using both a simple abstract food-chain model and a complex food-web model for an ecosystem in which nutrient limitation and recycling occur. The food-chain model demonstrated that both nutrient input, or loading, and food-chain length have important effects on resilience. For very small nutrient inputs, resilience (or the inverse of the return time to steady state TR) was in all cases an increasing function of nutrient-input rate. However, the resilience of food chains in which the autotroph was the highest level was lower and constant over a wider range of input levels than the case in which herbivores were also present. The presence of a carnivore level complicated the dependence of resilience on nutrient input, leading to cases in which increased input could actually decrease resilience. All of these behaviors are consistent with the generalization that the return time, TR, tends to ... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|