Patterns of trophic niche divergence between invasive and native fishes in wild communities are predictable from mesocosm studies

The Journal of Animal Ecology
Thi Nhat Quyen TranJ Robert Britton

Abstract

Ecological theory attempts to predict how impacts for native species arise from biological invasions. A fundamental question centres on the feeding interactions of invasive and native species: whether invasion will result in increased interspecific competition, which would result in negative consequences for the competing species, or trophic niche divergence, which would facilitate the invader's integration into the community and their coexistence with native species. Here, the feeding interactions of a highly invasive fish, topmouth gudgeon Pseudorasbora parva, with three native and functionally similar fishes were studied to determine whether patterns of either niche overlap or divergence detected in mesocosm experiments were apparent between the species at larger spatial scales. Using stable isotope analysis, their feeding relationships were assessed initially in the mesocosms (1000 L) and then in small ponds (<400 m(2) ) and large ponds (>600 m(2) ). In the mesocosms, a consistent pattern of trophic niche divergence was evident between the sympatric fishes, with niches shifting further apart in isotopic space than suggested in allopatry, revealing that sharing of food resources was limited. Sympatric P. parva also had a sma...Continue Reading

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Citations

Mar 13, 2016·Trends in Parasitology·J Robert Britton, Demetra Andreou
Aug 5, 2017·Ecology and Evolution·Maud Charlery de la MasselièrePierre-François Duyck
Jan 1, 2018·Biological Invasions·Thomas M Doherty-BoneLee E Brown

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