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Non-native species have multiple abundance-impact curves.
Ecology and Evolution ( IF 2.6 ) Pub Date : 2020-06-04 , DOI: 10.1002/ece3.6364
David L Strayer 1, 2
Affiliation  

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 Dreissena 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.

中文翻译:

非本地物种具有多个丰度-影响曲线。

丰度-影响曲线有助于理解和管理非本地物种的影响。丰度-影响曲线可以具有多种形状(例如,线性,阈值,S形),每种形状都有其对科学理解和管理的影响。有时,丰度-影响曲线被视为物种的一种特性,对于一个物种只有一条曲线。我认为丰度-影响曲线是由非本地物种及其入侵的生态系统共同决定的,因此一个物种可能具有多个丰度-影响曲线。入侵贻贝Dreissena的影响模型说明单个物种如何具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-影响曲线的程度而言,基于水平设计(时空替换)的丰度-影响曲线可能会产生误导,因此应格外谨慎。对于科学家和管理者来说,在考虑非本地物种的影响时正确指定丰度-影响曲线非常重要。将注意力从入侵物种转移到被入侵的生态系统,尤其是物种和生态系统之间的相互作用,可以增进我们对非本地物种如何影响生态系统的了解,并减少围绕非本地物种种群管理的不确定性。
更新日期:2020-07-25
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