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Competitive and predatory interactions between invasive mosquitofish and native larval newts

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Abstract

Invasive fish have a high disruptive potential in aquatic ecosystems, in which amphibians may be highly impacted due to intense competition and/or predation on their eggs and larvae. Most studies have focused on the effect of large invasive fishes such as salmonids, whereas the effect of smaller fish on amphibians has been seldom investigated. We experimentally studied effects of the invasive Eastern mosquitofish (Gambusia holbrooki) on pygmy newts (Triturus pygmaeus), a species endemic to the Iberian Peninsula. We set up outdoor mesocosms in Doñana National Park with native aquatic flora and invertebrate fauna, and containing larval newts at two experimental densities. Density of larval newts was also crossed with presence or absence of mosquitofish, either free-swimming or caged, in order to distinguish consumptive and non-consumptive effects. Increased density of coexisting larval newts did not reduce their survival, but reduced their growth and development. Newt survival and size at metamorphosis were dramatically reduced in the presence of free-swimming mosquitofish, whether at low or high fish densities. Caged mosquitofish, however, had no effect on larval newts. In laboratory trials, mosquitofish preyed more efficiently on insect larvae than did larval pygmy newts, highlighting the high competitive potential of mosquitofish. This was confirmed by the depletion of zooplankton that free fish caused in the experimental outdoor mesocosms. Our study suggests that invasive mosquitofish exert a high negative impact on coexisting newt populations. Such effects can be explained by a combination of direct predation, injuries caused by predation attempts, and intense competitive exploitation of common food resources.

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Acknowledgments

We thank Lola Asencio, Rosa Arribas, Pablo Burraco, Rafael Carmona, Sara Castro, Carmen Fernández, Pilar Fernández, Ana Herrero, María León, Raquel López and Daniel Moen for help in the field or in the laboratory. The staff of the Doñana Biological Reserve provided logistical support. Financial support was provided by the Spanish Ministry of Economy and Competitiveness through the Severo Ochoa Program for Centers of Excellence in R&D&I (SEV-2012-0262, Grant SO-07), and by CONACYT (Consejo Nacional de Ciencia y Tecnología de México; postdoctoral fellowship to ECG: 204202).

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Correspondence to Elisa Cabrera-Guzmán or Ivan Gomez-Mestre.

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Cabrera-Guzmán, E., Díaz-Paniagua, C. & Gomez-Mestre, I. Competitive and predatory interactions between invasive mosquitofish and native larval newts. Biol Invasions 19, 1449–1460 (2017). https://doi.org/10.1007/s10530-017-1369-5

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