COMPARATIVE LIFE-CYCLE, BIOMASS AND SECONDARY PRODUCTION OF THREE SYMPATRIC FRESHWATER GASTROPOD SPECIES
- 1 January 1993
- journal article
- Published by Oxford University Press (OUP) in Journal of Molluscan Studies
- Vol. 59 (1) , 43-50
- https://doi.org/10.1093/mollus/59.1.43
Abstract
The life cycles, biomass and secondary production of three sympatric freshwater basommatophoran snails, Lymnaea palustris (MÜller), Physa fontinalis Linnaeus and Anisus rotundatus (Poiret) were studied during two years in a freshwater ditch. L. palustris exhibited an iteroparous life-cycle whereas the two other species presented a semelparous life-cycle, adults died just after oviposition. L. palustris secondary production (dry weight) value was higher (P = 11 298.4 mg 0.1 m−1 yr−1) than those of P. fontinalis (P = 846.3 mg 0.1 m−2 yr−1) and A. rotundatus (P = 1192 mg 0.1 m−2 yr−1).Keywords
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