Abstract
MaxEnt, a commonly used approach of species distribution modelling, is widely used to predict plant invasion at the large spatial scale based on occurrence records and environmental variables. However, the number of occurrence records, number of environmental variables, and spatial scales have a large potential to affect the ability of MaxEnt to predict invasive plant distributions. In this study, we used the area under the curve (AUC) of the receiver operator characteristics as an indicator of MaxEnt performance, and evaluated the effects of the number of occurrence records, number of environmental variables, and spatial scales on MaxEnt distribution modelling of invasive plants based on 1015 cases of invasive plants. Next, we suggested improvements for model performance. We found significant relationships between the AUC and the above-mentioned modelling parameters. Furthermore, we determined the relevant threshold values for the available MaxEnt models (i.e. AUC >0.7). We suggested using an appropriate number of occurrence records and environmental variables (e.g. >5) and covered cell sizes of 5.0 arc-min to model the distributions of invasive plants on the global scale. Our study provides practical references using MaxEnt to prevent and control plant invasion under global changes and contributes to the exploration of species distribution modelling mechanisms.
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This research was supported by the National Key Research and Development Program of China (2016YFC1201101) and NSFC (31800449 and 31800464).
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Wan, JZ., Wang, CJ. & Yu, FH. Effects of occurrence record number, environmental variable number, and spatial scales on MaxEnt distribution modelling for invasive plants. Biologia 74, 757–766 (2019). https://doi.org/10.2478/s11756-019-00215-0
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DOI: https://doi.org/10.2478/s11756-019-00215-0