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1. The niche variation hypothesis predicts that among‐individual variation in niche use will increase in the presence of intraspecific competition and decrease in the presence of interspecific competition. We sought to determine whether the local isotopic niche breadth of fish inhabiting a wetland was best explained by competition for resources and the niche variation hypothesis, by dispersal of individuals...
Introduced species often thrive in modified systems, although it is not clear whether they have negative effects on native biota that might also be present or, alternatively, occupy niches that have been left empty due to the original habitat modification.We used 247 surveys of fish assemblages (48 species in all) in riverine reservoirs across the Iberian Peninsula to analyse the relationships between...
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