Strayer David L
Cary Institute of Ecosystem Studies Millbrook NY USA.
Graham Sustainability Institute University of Michigan Ann Arbor MI USA.
Ecol Evol. 2020 Jun 4;10(13):6833-6843. doi: 10.1002/ece3.6364. eCollection 2020 Jul.
The abundance-impact curve is helpful for understanding and managing the impacts of non-native species. Abundance-impact curves can have a wide range of shapes (e.g., linear, threshold, sigmoid), each with its own implications for scientific understanding and management. Sometimes, the abundance-impact curve has been viewed as a property of the species, with a single curve for a species. I argue that the abundance-impact curve is determined jointly by a non-native species and the ecosystem it invades, so that a species may have multiple abundance-impact curves. Models of the impacts of the invasive mussel show how a single species can have multiple, noninterchangeable abundance-impact curves. To the extent that ecosystem characteristics determine the abundance-impact curve, abundance-impact curves based on horizontal designs (space-for-time substitution) may be misleading and should be used with great caution, it at all. It is important for scientists and managers to correctly specify the abundance-impact curve when considering the impacts of non-native species. Diverting attention from the invading species to the invaded ecosystem, and especially to the interaction between species and ecosystem, could improve our understanding of how non-native species affect ecosystems and reduce uncertainty around the effects of management of populations of non-native species.
丰度-影响曲线有助于理解和管理外来物种的影响。丰度-影响曲线可以有多种形状（例如，线性、阈值、S形），每种形状对科学理解和管理都有其自身的影响。有时，丰度-影响曲线被视为物种的一种属性，一个物种有一条单一的曲线。我认为丰度-影响曲线是由外来物种及其入侵的生态系统共同决定的，因此一个物种可能有多个丰度-影响曲线。入侵贻贝影响的模型表明了一个单一物种如何能有多个不可互换的丰度-影响曲线。就生态系统特征决定丰度-影响曲线而言，基于水平设计（空间-时间替代）的丰度-影响曲线可能会产生误导，并且应该极其谨慎地使用，如果要使用的话。对于科学家和管理者来说，在考虑外来物种的影响时正确确定丰度-影响曲线很重要。将注意力从入侵物种转移到被入侵的生态系统，特别是物种与生态系统之间的相互作用，可能会增进我们对外来物种如何影响生态系统的理解，并减少围绕外来物种种群管理效果的不确定性。
