Biodiversity lessens the risk of cascading extinction in model food webs
Biodiversity lessens the risk of cascading extinction in model food webs
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DOI：
10.1046/j.1461-0248.2000.00130.x
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发表时间：
2000-03-01
期刊：
影响因子：
8.8
通讯作者：
Jonsson, T
中科院分区：
文献类型：
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作者：
Borrvall, C;Ebenman, B;Jonsson, T
由于食物网中物种之间的复杂相互作用，一个物种的灭绝可能会导致进一步的灭绝，从而导致物种组成和生态系统过程的急剧变化。我们发现，在模型食物网中一个物种的损失之后，其他物种灭绝的风险随着每个功能组的物种数量而降低。对于一个给定的物种数量的功能组，进一步的排斥的风险是最高的，当一个自养生物被删除和最低的顶部捕食者被删除。此外，当网中的相互作用强度的分布从相等改变为偏斜（强连接少，弱连接多）时，稳定性降低。我们还发现，杂食动物似乎稳定模型食物网。我们的研究结果表明，高生物多样性可以作为一种保险，对激进的生态系统变化。
Due to the complex interactions between species in food webs, the extinction of one species could lead to a cascade of further extinctions and hence cause dramatic changes in species composition and ecosystem processes. We found that the risk of additional species extinction, following the loss of one species in model food webs, decreases with the number of species per functional group. For a given number of species per functional group, the risk of further extinctions is highest when an autotroph is removed and lowest when a top predator is removed. In addition, stability decreases when the distribution of interaction strengths in the webs is changed from equal to skew (few strong and many weak links). We also found that omnivory appears to stabilize model food webs. Our results indicate that high biodiversity may serve as an insurance against radical ecosystem changes.