Original Articles

EFFECT OF CONSTANT TEMPERATURE ON POPULATION DYNAMICS OF BULINUS TROPICUS (KRAUSS) AND LYMNAEA NATALENSIS KRAUSS

DOI: 10.1080/03779688.1985.9633106
Author(s): K.N. de KockSnail Research Unit of the South African Medical Resesrch Council, South Africa, J.A. van EedenSnail Research Unit of the South African Medical Resesrch Council, South Africa

Abstract

Life-tables were compiled for cohorts of the two freshwater snail species Bulinus tropicus (Krauss) and Lymnaea natalensis Krauss at six different constant temperatures from 17 to 32 °C under identical conditions of crowding, feeding and chemical composition of the water. The recognized population parameters were calculated from the life-tables for each species at each constant temperature and used to assess the rôle of temperature in the population dynamics and geographic distribution of both species in South Africa. It was deduced that temperature plays a very important rôle in governing the geographic distribution of B. tropicus while it is less important in the case of L. natalensis.

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