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Nile tilapia(Oreochromis niloticus)invasion impacts trophic position and resource use of commercially harvested piscivorous fishes in a large subtropical river

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Ecological Processes 2023年第1期12卷 313-329页

作者： Fangmin Shuai Jie Li Sovan Lek Pearl River Fisheries Research Institute CAFSGuangzhou 510380China Universitéde Toulouse-PaulSabatier 118 Route de Narbonne31062 Toulouse CedexFrance

Background Although freshwater ecosystems cover less than 1%of the earth’s surface,they support extremely high levels of biodiversity and provide vital ecosystem ***,due to the introduction of non-native fishes,aquatic ecosystem functioning has been altered,and in some cases,declined *** the impacts of invasive species has proven *** this study,we examined the relative trophic position of native piscivorous fishes to estimate the effects of invasive Nile tilapia on food webs in the downstream sections of an invaded large subtropical river,the Pearl River,***,we quantified how native piscivorous fish diets changed as the Nile tilapia invasion *** The trophic position of the widely distributed and locally important economically harvested piscivorous culter fish(Culter recurviceps),mandarinfish(Siniperca kneri),and catfish(Pelteobagrus fulvidraco)lowered significantly in the invaded Dongjiang River compared to an uninvaded reference Beijiang *** lower trophic position of these piscivorous fishes was reflected by a major reduction in the proportion of prey fish biomass in their diets following the Nile tilapia *** fishes in the diet of culter fish from the reference river(33%small fishes,17%zooplankton)shifted to lower trophic level zooplankton prey in the invaded river(36%zooplankton,25%small fish),possibly due to the presence of Nile ***,small fishes in the diet of mandarinfish in the reference river(46%small fishes,11%aquatic insects)declined in the invaded river(20%aquatic insects,30%small fishes).Similarly,the diet of catfish from the reference river shifted from fish eggs(25%fish eggs,25%aquatic insects)to aquatic insects in the invaded river(44%aquatic insects,5%fish eggs).Conclusions The results of this study contributed to a growing body of evidence,suggesting that Nile tilapia can modify trophic interactions in invaded *** is crucial to understand t

关键词： Nile tilapia Invasion stable isotope ratio Trophic position stable isotope mixing model

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