Strategies of Coexistence of Two Species: Erpobdella octoculata and E. vilnensis (Hirudinea: Erpobdellidae)

International Review of Hydrobiology - Tập 92 Số 4-5 - Trang 527-538 - 2007
Jana Schenková, Jiří Jarkovský1, Jan Helešic2
1Institute of Biostatistics and Analyses, Faculty of Medicine and Faculty of Science, Masaryk University, Kamenice 126/3, 625 00, Brno, Czech Republic
2Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlarska 2, 611 37 Brno, Czech Republic.

Tóm tắt

AbstractPopulations of Erpobdella octoculata and E. vilnensis were studied monthly over two years (May 1999–April 2001) at four sampling points on the river Rokytná (Czech Republic). The water depth and velocity were measured and the Froude number for each sample was calculated to follow flow conditions above the bottom. Temporal differences in biomass of the two species were studied by comparing their wet weights and evaluated by the time series analysis; differences in their diets were evaluated by gut content analyses. Significantly different hydrodynamic preferences for juvenile and adult stages of E. octoculata and E. vilnensis were recorded. In E. vilnensis only, an annual cycle was recorded with a one‐month shift of mean weights compared to E. octoculata. This shift, together with the correlation of the leeches wet weights with their prey sizes and their distinct habitat preferences are suggested as mechanisms that explain their coexistence. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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International Review of Hydrobiology

Tập 92 Số 4-5

527-538

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