Stable isotopes reveal niche segregation between native and non‐native Hoplias in a Neotropical floodplain

• DOI: 10.1111/eff.12536
• Publication Date: 2020-02-10T12:24:03Z
• Authors: Gustavo H. Zaia A...; Vivian M. Cionek; Gislaine I. Manetta; Laryssa H. R. Paz...; Evanilde Benedito
• Keywords: 0106 biological sciences; 14. Life underwater; 15. Life on land; 01 natural sciences

Abstract We investigated whether isotopic niche partitioning could mediate the coexistence between native ( Hoplias sp. B) and non‐native mbigua ) trahira in a Neotropical floodplain. hypothesised that during dry season both species inhabit isolated sites (i.e. lakes) thus rely on distinct food resources to sustain their coexistence. found evidence of trophic segregation among freshwater fish Upper Paraná River, Brazil. Even though same primary littoral carbon sources present similar diversity, was attained through larger amplitude smaller width for fish. Three decades after initial invasion, have foraging behaviour do not compete with trahira; this is likely due morpho‐anatomical differences. Limited morphological similarity these congeneric might be strongest factor contributing River floodplain season.