The effects of intraspecific and interspecific diversity on food web stability

The effects of intraspecific and interspecific diversity on food web stability
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种内和种间多样性对食物网稳定性的影响

DOI:
10.1007/s12080-020-00460-z
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发表时间:
2020
影响因子:
1.6
通讯作者:
Gouhier, Tarik C.
Gouhier, Tarik C.
中科院分区:
环境科学与生态学4区
文献类型:
--
作者:
Noto, Akana E.;Gouhier, Tarik C.

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虽然物种多样性对食物网稳定性的影响早已被认识,但对种内多样性的影响知之甚少。实证研究发现,种内多样性可以增加社区的弹性和阻力,但很少有理论研究试图使用建模方法来确定种内多样性将如何影响食物网的稳定性。为了开始解决这一知识缺口,我们在May的经典随机食物网模型中加入了种内多样性。我们发现,像物种多样性,种内多样性降低稳定性。这些稳定性的影响,不能简单地归因于相互作用强度的变化,表明种内多样性可以有自己的独立的稳定性的影响。它的影响取决于基因型间和基因型内相互作用之间的关系;当基因型内的竞争比它们之间的竞争更强时,食物网通常比匡威时更稳定。总的来说,我们的模型表明,确定种内多样性对自然系统稳定性的影响的方向和幅度将需要更多的经验信息,它的包容性如何改变相互作用强度和食物网拓扑结构的模式。
Although the effects of species diversity on food web stability have long been recognized, relatively little is known about the influence of intraspecific diversity. Empirical work has found that intraspecific diversity can increase community resilience and resistance, but few theoretical studies have attempted to use modeling approaches to determine how intraspecific diversity will affect food web stability. To begin to address this knowledge gap, we added intraspecific diversity to May’s classic random food web model. We found that, like species diversity, intraspecific diversity decreased stability. These effects on stability were not simply attributable to changes in interaction strengths, suggesting that intraspecific diversity can have its own independent effects on stability. Its effect depends on the relationship between inter- and intra-genotype interactions; when competition within genotypes was stronger than among them, food webs were generally more stable than when the converse was true. Overall, our model suggests that determining the direction and the magnitude of intraspecific diversity’s effects on stability in natural systems will require more empirical information about how its inclusion alters patterns of interaction strength and food web topology.
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