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Stable isotopes reveal mild trophic modifications in a native–invasive competitive relationship

  • Eudald Pujol-Buxó
  • Gabriel M. Riaño
  • Gustavo A. Llorente
Original Paper

Abstract

Temporal or evolutionary changes in the effects of invasive competitors on native species have not been studied in great depth. In this study, we explored possible modifications in the trophic shifts of native and invasive tadpoles in a set of ephemeral ponds with different amounts of time elapsed since the invasion, i.e., with different degrees of naiveté of the native species to its invasive competitor. Using stable isotopes analysis, we found that the native (Epidalea calamita) and invasive (Discoglossus pictus) species always segregated in their trophic position within ponds. Furthermore, the isotopic signature of the tadpoles was affected by the composition and diversity of the surrounding vegetal and animal communities. The amount of time elapsed since the invasion did not influence the magnitude of the trophic differences between the species, but it did affect the nature of this segregation. Segregation at the trophic level occurred most frequently during the first stages of invasion, with the invasive species occupying higher trophic levels. However, segregation was progressively attained through the consumption of different items within the same trophic level when the amount of time since invasion increased. Thus, our results point that the native species no longer uses a lower trophic level after several generations of coexistence. In contrast, changes in the trophic niche width of either species during the invasion process were largely undetected.

Keywords

Amphibians Discoglossus pictus Epidalea calamita Rapid evolution Syntopy Tadpoles 

Notes

Acknowledgements

We would like to thank Felipe Campos, Berta Capellà and Àlex Garcia-Cisneros for help in the fieldwork, and two anonymous reviewers for useful comments on the manuscript. Permissions to capture were granted by the Departament d’Agricultura, Ramaderia, Pesca, Alimentació i Medi Natural de la Generalitat de Catalunya. EPB did part of the fieldwork necessary for the study during the financial support of a FPU grant (AP2010-5563, Ministerio de Educación, Cultura y Deporte, Spain). The study strictly adhered to the Guidelines for the Care and Use of Laboratory Animals of the University of Barcelona and was approved by the institution. Procedures followed the regulations that cover animal housing and experimentation in Catalonia (Spain) contained in the Generalitat de Catalunya’s Decret 214/1997 of 30th July and Llei 5/1995 of 21st June, which apply the European Directive 86/609/CEE to Spanish law in Catalonia.

Supplementary material

10530_2018_1893_MOESM1_ESM.docx (756 kb)
Supplementary material 1 (DOCX 756 kb)

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of BiologyUniversity of BarcelonaBarcelonaSpain
  2. 2.IrBio, Institut de Recerca de la BiodiversitatUniversity of BarcelonaBarcelonaSpain

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