You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Habitat Segregation in a Water Boatman (Corixidae) Assemblage: The Role of Predation
Hans G. Oscarson
Vol. 49, No. 2 (Jun., 1987), pp. 133-140
Stable URL: http://www.jstor.org/stable/3566018
Page Count: 8
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
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.
Oikos © 1987 Nordic Society Oikos