Ecology 85:2656–2663īenton TG, Solan M, TRavis JMJ, Sait SM (2007) Microcosm experiments can inform global ecological problems. Plenum, New York, pp 191–229īaxter CV, Fausch KD, Murakami M, Chapman PL (2004) Fish invasion restructures stream and forest food webs by interrupting reciprocal prey subsidies. In: Barnes JR, Minshall GW (eds) Stream ecology: application and testing of general ecological theory. Hence, interactions between different predators directly affected stream community structure, while predator identity had the strongest impact on ecosystem attributes.Īllan JD (1983) Predator-prey relationships in streams. Furthermore, the results indicate indirect negative effects between the two ecosystem attributes, with a negative correlation between the amount of detritus and algal biomass. Predator identity (the benthic fish), but not predator species richness had a positive effect on benthic algal biomass. Increasing predator species richness decreased detritus accumulation and presence of the benthic fish resulted in the lowest amounts of detritus. Moreover, the accumulation of detritus was affected by both predator species richness and predator identity. While there was no effect on macroinvertebrate biomass, diversity of predatory macroinvertebrates decreased with increasing predator species richness, which suggests complementarity between predators for this functional feeding group. We found effects of both predator species richness and identity, but the direction of effects differed depending on the response variable. drift feeding fish and omnivorous crayfish) but had overlapping food preferences. Predators differed in their foraging strategies (benthic vs. Predator richness was manipulated from zero to three predators, using two fish and one crayfish species, while density was kept equal ( n = 6) in all treatments with predators. We tested the effects of different stream predators on macroinvertebrates and ecosystem attributes, in terms of benthic algal biomass and accumulation of detritus, in artificial stream channels. It is important to understand the role that different predators can have to be able to predict how changes in the predator assemblage may affect the prey community and ecosystem attributes.
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