Resistance is futile: lack of predator switching and a preference for native prey predict the success of an invasive prey species

Royal Society Open Science
Ross N CuthbertJaimie T A Dick

Abstract

Invasive species continue to severely impact biodiversity, yet predicting the success or failure of introduced species has remained elusive. In particular, the relationship between community invasibility and native species diversity remains obscure. Here, we apply two traditional ecological concepts that inform prey population stability and hence invasibility. We first show that the native predatory crustacean Gammarus duebeni celticus exhibited similar type II (destabilizing) functional responses (FRs) towards native mayfly prey and invasive amphipod prey, when these prey species were presented separately. However, when the two prey species were presented simultaneously, the predator did not exhibit prey switching, instead consuming disproportionately more native prey than expected from the relative abundance of native and invasive species. These consumptive propensities foster reductions of native prey, while simultaneously limiting biotic resistance against the invasive species by the native predator. Since our theoretical considerations and laboratory results match known field invasion patterns, we advocate the increased consideration of FR and prey switching studies to understand and predict the success of invasive species.

References

Jun 13, 2015·Royal Society Open Science·Mandy BunkeAlison M Dunn
Feb 16, 2017·Nature Communications·Hanno SeebensFranz Essl

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Citations

Aug 9, 2019·Global Change Biology·Bram CornelissenOliver Schweiger
Jun 17, 2020·Conservation Biology : the Journal of the Society for Conservation Biology·Katie Peterson, Michael Bode
Oct 28, 2019·Scientific Reports·Ross N CuthbertJaimie T A Dick
Aug 8, 2018·Journal of Medical Entomology·Ross N CuthbertJaimie T A Dick
Aug 28, 2021·Animals : an Open Access Journal From MDPI·Pavel FrantaBořek Drozd

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