Ellner et al. (2020) state that identifying the mechanisms producing positive invasion growth rates (IGR) is useful in characterising species persistence. We agree about the importance of the sign of IGR as a binary indicator of persistence, but question whether its magnitude provides much information once the sign is given.

中文翻译：

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入侵增长率及其与持久性的关系：对Ellner等人的技术评论的回应。

Ellner等。（2020）指出，确定产生正向入侵增长率（IGR）的机制可用于表征物种的持久性。我们同意将IGR的标志作为持久性的二进制指标的重要性，但是我们质疑一旦给出标志，IGR的大小是否会提供很多信息。