期刊
BIOLOGICAL INVASIONS
卷 21, 期 8, 页码 2543-2547出版社
SPRINGER
DOI: 10.1007/s10530-019-02002-z
关键词
Consumer-resource; Impact prediction; Handling time; Attack rate; Risk assessment; Invasive alien species; Functional Response Ratio
资金
- Department for the Economy, Northern Ireland
- Inland Fisheries Ireland
- Department of Agriculture, Environment and Rural Affairs, Northern Ireland
- Irish Environmental Protection Agency [2015-NCMS-4]
The Functional Response (FR) has been identified as a powerful predictive tool to forecast the ecological impacts of existing, emerging and future invasive alien species. In particular, the parameters of attack rate a and handling time h may be predictive of the ecological impacts of invaders when utilised in comparison with trophically analogous natives. However, researchers in many cases face somewhat contradictory impact predictions based on the use of one parameter or the other. Here, we thus propose a new metric, the Functional Response Ratio (FRR), which is simply a divided by h: that is, FRR=a/h. Given that high values of a and low values of h should associate with high impact, and vice versa, the FRR metric balances the information from both parameters. This also resolves contradictions when one parameter gives opposite predictions to the other. Using multiple examples obtained from the literature, we find that the FRR indeed resolves such contradictions and that values of FRR of invaders are consistently higher than those of natives, irrespective of experimental or environmental context. Accordingly, the use of FRR provides a novel and reliable metric for scientists, stakeholders and practitioners to predict the ecological impacts of existing, emerging and future invasive alien species across taxa and trophic groups.
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