Unpalatable prey resolves the paradox of enrichment
Unpalatable prey resolves the paradox of enrichment
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DOI：
10.1098/rspb.1999.0765
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发表时间：
1999-06-22
影响因子：
4.7
通讯作者：
Yamamura, N
中科院分区：
文献类型：
--
作者：
Genkai-Kato, M;Yamamura, N
在自然生态系统中，富集化是一个日益严重的趋势。一个捕食者-食饵系统的理论模型，在捕食过程中有一个自然的饱和假设，该模型预测，丰富会导致种群波动到随机灭绝。然而，这种“丰富的悖论”并不总是出现在实验和自然群落中。在这里，我们提出了一个理论模型，它描述了一种新的机制来解决捕食者具有最优选择摄食的情况下的悖论。具体地说，利润较低但可食用(因此不可口)的猎物物种大大减少了种群波动的幅度，并牢牢地防止物种的最低丰度降至特定值以下。因此，这种令人不快的猎物的存在确保了系统对浓缩的健壮性。
Enrichment is an increasingly serious trend in natural ecosystems. A theoretical model of a predator-prey system with a natural assumption of satiation in predation predicts that enrichment causes the populations to fluctuate to stochastic extinction. However, this 'paradox of enrichment' does not always occur in experimental and natural communities. Here we present a theoretical model that describes a novel mechanism for resolving the paradox in the case of a predator with optimal selective feeding. Specifically, a less profitable but edible (thus 'unpalatable') prey species sharply reduces the amplitude of population oscillations and firmly prevents the minimum abundances of species from falling below certain values. The presence of such an unpalatable prey thus guarantees the robustness of the system against enrichment.