Biological Invasions

, Volume 20, Issue 4, pp 1033–1047 | Cite as

Fish invasion alters ecosystem function in a small heterotrophic stream

  • C. M. Pennuto
  • K. A. Cudney
  • C. E. Janik
Original Paper


The strength of trophic cascade effects in aquatic ecosystems depend, in part, on the identity of the top predator involved. We examined whether an invasive benthic fish (round goby, Neogobius melanostomus) altered the strength of cascade effects in a heterotrophic stream and in a controlled mesocosm experiment relative to the effects of a functionally similar, native fish. In the stream, the introduced fish had a direct effect on grazer and shredder abundance which led to a significant increase in periphyton chlorophyll a, a significant reduction in leaf breakdown rate, an increase in leaf biomass remaining, but no change in periphyton ash-free dry mass. In mesocosms, native and introduced fish similarly reduced shredder abundance, but this did not lead to an indirect effect on leaf breakdown rates or biomass remaining at the end of the experiment. Indirect effects of introduced fish on periphyton biomass and chlorophyll a in mesocosms were both significant and were stronger than in the field, but were the result of grazer behavioral modification and not reduced grazer abundance. Collectively, these results suggest non-native fish have the ability to initiate trophic cascades in heterotrophic streams, and that both fish identity and environmental context are important in determining the strength of cascades.


Neogobius melanostomus Trophic cascade Leaf litter decomposition Periphyton 



Parts of this research were supported by an NSF, URM award (DEB No. 0731582) to CMP and supporting CEJ. Special thanks to the BSC Field Station manager, Mark Clapsadl, for securing the mesocosm location and logistics.


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Copyright information

© Springer International Publishing AG, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Biology Department, Great Lakes CenterBuffalo State CollegeBuffaloUSA
  2. 2.University at BuffaloAmherstUSA
  3. 3.Niagara County Community CollegeNiagara FallsUSA

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