OVERCOMPENSATION AND POPULATION-CYCLES IN AN UNGULATE
OVERCOMPENSATION AND POPULATION-CYCLES IN AN UNGULATE
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DOI：
10.1038/355823a0
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发表时间：
1992-02-27
期刊：
影响因子：
64.8
通讯作者：
CLUTTONBROCK, TH
中科院分区：
文献类型：
--
作者：
GRENFELL, BT;PRICE, OF;CLUTTONBROCK, TH
尽管理论研究表明过度补偿的密度依赖机制可能会产生动物数量的规则或混乱波动，但大多数现实的无脊椎动物种群单物种模型的过度补偿不足以导致持续的种群周期1-3。很少有人考虑过度补偿可能在脊椎动物种群中产生循环或混乱的可能性。在这里，我们表明，高度过度补偿的密度依赖性死亡率会导致反复出现的种群崩溃，这与在自然有限的索伊羊种群中观察到的情况一致。观察到的两次事故之间的间隔为三年或更长，这表明死亡率急剧“集中”在狭窄的人口密度范围内。
ALTHOUGH theoretical studies show that overcompensatory density-dependent mechanisms can potentially generate regular or chaotic fluctuations in animal numbers, the majority of realistic single-species models of invertebrate populations are not overcompensatory enough to cause sustained population cycles 1-3. The possibility that overcompensation may generate cycles or chaos in vertebrate populations has seldom been considered. Here we show that highly overcompensating density-dependent mortality can generate recurrent population crashes consistent with those observed in a naturally limited population of Soay sheep. The observed interval of three or more years between crashes points to sharp 'focusing' of mortality over a narrow range of population density.