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The abundance and spatial distribution of the coexisting species Glaenocorisa propinqua, Sigara distincta and S. scotti were studied in the field under two different conditions of predation; (1) without any fish predation and (2) with predation by the roach (Rutilus rutilus). When predators were absent, larvae and adults of all three corixid species differed in habitat use; S. scotti used the shallowest most in-shore habitat and G. propinqua the deepest habitat farthest from the shore. S. distincta used an intermediate habitat in regard to both depth and distance from shore. Ten days after introduction of roach, G. propinqua, the most abundant species, went extinct. This species had the most exposed habitat and hunting behaviour. After a few months, S. distincta was the only corixid species remaining in the lake, and it was much reduced in abundance and found only in the in-shore habitat formerly occupied by S. scotti. The three species have partly overlapping but different habitats, which indicates a habitat partitioning between them.
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