Differential use of trophic resources between an exotic and a coexisting native snail
- Altieri, Paula Daniela
- Paz, Laura Estefania
- Ferreira, Ana Clara
- Delevati Colpo, Karine
- Rodrigues Capitulo, Alberto
- Jensen, Roberto Francisco
- Costa, Vladimir
- Ocon, Carolina Silvia
DOIAbstract
Knowing the interactions between exotic and native species is essential to establish possible threats to the local fauna. In this study, we assessed the use of food resources and diet overlap between a recently introduced snail, Sinotaia quadrata, and a native species, Pomacea canaliculata. We analyzed the gut content and stable isotope of snails and resources in a lowland stream where both species coexist. Both Schoener’s and isotope dietary overlap indexes supported dietary overlap. Conversely, gut content analysis showed differences in consumption: S. quadrata consumed more detritus and diatoms than P. canaliculata, whose diet was characterized by detritus and macrophyte remains. Macrophytes were the resource that most contributed to the...
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