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Field investigations were carried out over a 3-year period in five habitats of Galba truncatula located in the department of Haute-Vienne to determine periods of egglaying and to follow the growth of these snails in relation to their annual generation. In the three ditches with running water throughout the year, a single annual generation of G. truncatula was found and egg-masses were laid from the end of June up to the beginning of October. In the other two habitats subjected to summer drying (the sites were dried in August and September), two generations were noted and egg-deposits occurred from mid-April to the end of June and in November-December. Even if variations in the numbers of snails and their growth were found in these three permanent habitats, the parasitic risks caused by these populations showing a single annual generation were limited owing to the low number of these communities in northern Haute-Vienne (three only out of a total of 1,731 detected in these meadows of this zone).

Les générations annuelles de Galba truncatula (Mollusca, Lymnaeidae) dans le département de la Haute-Vienne