Experimental support for a resource-based mechanistic model of invasibility
Experimental support for a resource-based mechanistic model of invasibility
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DOI：
10.1046/j.1461-0248.2001.00246.x
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发表时间：
2001-09-01
期刊：
影响因子：
8.8
通讯作者：
Pelsor, M
中科院分区：
文献类型：
--
作者：
Davis, MA;Pelsor, M
最近的理论提出了一种机制之间的关系资源的可用性，竞争和入侵。在一个田间实验中，我们操纵资源和竞争，我们证实，资源可用性的变化影响竞争强度，这反过来又影响入侵。我们发现，短短几周的资源可用性波动对植物入侵成功（生存率和覆盖率）产生了很大的影响，包括波动后长达1年的时间。如果资源可用性是控制入侵性的主要机制，那么它可以作为一个统一的概念，可以整合早期关于入侵性的想法。结果强调了历史在入侵过程中的重要作用，特别是随机的，短暂的事件，暂时减少或暂停竞争，增加入侵的发生。因此，要在事后重建特定入侵的生态可能非常困难，甚至不可能。
Recent theory has suggested a mechanistic relationship between resource availability, competition and invasibility. In a field experiment, in which we manipulated resources and competition, we confirmed that changes in resource availability affected competition intensity, which in turn affected invasibility. We found that fluctuations in resource availability of as short as a few weeks had a large impact on plant invasion success (survival and percentage cover), including up to 1 year following the fluctuations. If resource availability is a primary mechanism controlling invasibility, it may serve as a unifying concept that can integrate earlier ideas regarding invasibility. The results emphasize the important role of history in the invasion process, particularly the occurrence of stochastic, short-lived events that temporarily reduce or suspend competition and increase invasibility. Therefore, it may be very difficult, or even impossible, to reconstruct the ecology of particular invasions after the fact.