Positive interactions among competitors can produce species-rich communities
Positive interactions among competitors can produce species-rich communities
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DOI：
10.1111/j.1461-0248.2008.01204.x
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发表时间：
2008-09-01
期刊：
影响因子：
8.8
通讯作者：
Gross, Kevin
中科院分区：
文献类型：
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作者：
Gross, Kevin
尽管物种之间的积极相互作用有据可查，但大多数研究多物种共存的生态理论仍然植根于竞争和捕食等对抗性相互作用。该理论的标准资源竞争模型预测，共存物种的数量不应超过限制人口增长的因素的数量。在这里，我表明资源竞争者之间的积极互动可以产生由单一有限资源支持的物种丰富的模型群落。模拟表明，当资源竞争者降低彼此的人均死亡率（例如通过改善非生物胁迫）时，即使净种间相互作用仍然为负，多物种与单一资源的稳定共存可能很常见。这些结果表明，积极的相互作用可能为在自然界中生成物种丰富的群落提供重要机制。他们还表明，当物种同时进行对抗和积极相互作用时，关注物种之间的净相互作用可能会掩盖重要的共存机制。
Although positive interactions between species are well documented, most ecological theory for investigating multispecies coexistence remains rooted in antagonistic interactions such as competition and predation. Standard resource-competition models from this theory predict that the number of coexisting species should not exceed the number of factors that limit population growth. Here I show that positive interactions among resource competitors can produce species-rich model communities supported by a single limiting resource. Simulations show that when resource competitors reduce each others' per capita mortality rate (e.g. by ameliorating an abiotic stress), stable multispecies coexistence with a single resource may be common, even while the net interspecific interaction remains negative. These results demonstrate that positive interactions may provide an important mechanism for generating species-rich communities in nature. They also show that focusing on the net interaction between species may conceal important coexistence mechanisms when species simultaneously engage in both antagonistic and positive interactions.