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High habitat invasibility unveils the invasiveness potential of water frogs

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Abstract

Determining the invasibility of habitats by alien species is crucial for understanding their spread potential, the habitats the most at risk and to implement adequate management actions. This is urgent for introduced taxa that show high invasion potential across broad geographical scales. We here assess these processes in invasive Pelophylax water frogs which are widespread colonizers across Western Europe and for which the invasibility of habitats remains to be quantified. Specifically, we used hierarchical occupancy models in a Bayesian framework to identify local- and landscape-scale features that can enhance occupancy of the most common invasive water frog, the marsh frog (P. ridibundus), in southern France. Water frogs were highly detectable and showed high occupancy across the invaded landscape. The invaders expressed a very broad habitat tolerance for both local- and landscape-scale variables while their invasion was facilitated by the occurrence of deep, permanent ponds with abundant aquatic vegetation and high sun exposure. Cross-validation showed a good transferability of models across space. The high invasibility of a wide range of habitats by Pelophylax water frogs is alarming and unveils their invasiveness, contributing therefore to explain their success of invasion over broad geographic scales.

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All data analysed during this study are included in this published article [and its supplementary information files].

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Acknowledgements

We thank both reviewers for their constructive comments on our manuscript. We are grateful to the land owners and municipalities for allowing access to their ponds, to Institut Géographique National for providing maps (Inspire program), to C. Dufresnes, G. Mazepa and M. Pabijan for their genetic analyses and discussions, to L. Seger, S. Bettencourt, A. Lacombe and L. Pinto for field help, to P.A. Crochet for logistic support, and to V. Renard for digitalizing some data. Research permits in the area were obtained from DREAL Occitanie. This study, based only on visual surveys without animal manipulations, followed all ethical guidelines. This research was supported by Fonds de la Recherche Scientifique—FNRS under PDR grant number T.0070.19 (M. Denoël) and by the Erasmus exchange program. M. Denoël and F. Pille are respectively a Research Director and a PhD student at F.R.S.—FNRS and P. Padilla, a PhD student at Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture (FRIA).

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Correspondence to Mathieu Denoël.

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Denoël, M., Duret, C., Lorrain-Soligon, L. et al. High habitat invasibility unveils the invasiveness potential of water frogs. Biol Invasions 24, 3447–3459 (2022). https://doi.org/10.1007/s10530-022-02849-9

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  • DOI: https://doi.org/10.1007/s10530-022-02849-9

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