Abstract
Introduced species are confronted with new environments to which they need to adapt. However, the ecological success of an introduced species is generally difficult to predict, especially when hybridizations may be involved in the invasion success. In western Europe, the lake frog Pelophylax ridibundus appears to be particularly successful. A reason for this species’ success might be the presence of the invader’s genetic material prior to the introduction in the form of a hybrid between P. ridibundus and a second indigenous water frog species. These hybrids reproduce by hybridogenesis, only transmitting the ridibundus genome to gametes and backcrossing with the indigenous species (i.e. P. lessonae). This reproductive system allows the hybrid to be independent from P. ridibundus, and allows the ridibundus genome to be more widely spread than the species itself. Matings among hybrids produce newly formed P. ridibundus offspring (N), if the genomes are compatible. Therefore, we hypothesize that hybridogenesis increases the invasiveness of P. ridibundus (1) by enhancing propagule pressure through N individuals, and/or (2) by increasing adaptation of invaders to the native water frogs’ habitat through hybrid-derived ridibundus genomes that are locally adapted. We find support for the first hypothesis because a notable fraction of N tadpoles is viable. However, in our semi-natural experiments they did not outperform ridibundus tadpoles in the native water frogs’ habitat, nor did they differ physiologically. This does not support the second hypothesis and highlights ecological constraints on the invasion. However, we cannot rule out that these constraints may fall with ongoing selection, making a replacement of indigenous species highly probable in the future.
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Acknowledgments
We thank S. Kosellek and J. Cote for their help with field and laboratory works, as well as M. C. Fisher and D. C. Woodhams for linguistic corrections. Constructive comments on the manuscript were provided by an anonymous reviewer. This study was made possible by partnerships with Fondation Pierre Vérots (Saint-Jean-de-Thurigneux, Ain, France) and pumping site (Zone de captage “Crépieux-Charmy”, Villeurbanne, France) and was supported by grants from French Environment Ministry (program INVABIO).
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Luquet, E., Vorburger, C., Hervant, F. et al. Invasiveness of an introduced species: the role of hybridization and ecological constraints. Biol Invasions 13, 1901–1915 (2011). https://doi.org/10.1007/s10530-011-0010-2
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DOI: https://doi.org/10.1007/s10530-011-0010-2