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FIGURE 10.12 (a) Frequency of stream sites where the shredder community showed high dominance - low evenness (shaded bars) versus high evenness (open bars) for 36 streams in France and Sweden. (b) Litter decomposition rate as a function of number of shredder species at high (squares) and low (circles) dominance sites in northern Swedish (closed symbols) and French (open symbols) streams. Gf, Gammarus fossarum, Cv, Chaetopteryx villosa, Sp, Sericostoma personatum, Nc, Nemoura cinerea, Pm, Protonemura meyeri. (Reproduced from Dangles and Malmqvist 2004.)

(a) Shredder evenness (b) Shredder richness

FIGURE 10.12 (a) Frequency of stream sites where the shredder community showed high dominance - low evenness (shaded bars) versus high evenness (open bars) for 36 streams in France and Sweden. (b) Litter decomposition rate as a function of number of shredder species at high (squares) and low (circles) dominance sites in northern Swedish (closed symbols) and French (open symbols) streams. Gf, Gammarus fossarum, Cv, Chaetopteryx villosa, Sp, Sericostoma personatum, Nc, Nemoura cinerea, Pm, Protonemura meyeri. (Reproduced from Dangles and Malmqvist 2004.)

and consumption, heterotrophic respiration increased due to greater biofilm growth, primary production doubled, and because respiration increased more than primary production, net ecosystem metabolism showed a greater deficit. This example is of more than academic interest: fishes of the Prochilodontidae are the most important commercial species of South America and are declining due to the combined influence of dams and overfishing. Changes to ecosystem function seem all too likely to occur over large areas of the Neotropics due to the loss of species in this family.

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