Natural enemies of terrestrial molluscs by Barker, G. M. (Eds.)

By Barker, G. M. (Eds.)

This publication, which includes 15 chapters, attracts jointly the on hand details at the variety of organisms that represent the common enemies of terrestrial gastropods. In a chain of evaluation chapters, it offers an authoritative synthesis of present wisdom and learn for predators, parasites and pathogens. This booklet is for either scholars and pros desirous about the conservation of gastropod groups in ordinary habitats and administration of pestiferous species. to be had In Print

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1984), and domestic sheep Ovis aries (Linnaeus) (Bovidae) on D. , 1989; Barker, 1991). Effects on Population Dynamics The intensity of bird and mammalian predation on terrestrial gastropods varies in both time and space. In Britain, predation by T. philomelos is usually maximal in spring and summer (Cain, 1983), but at some locations peaks occur in both winter and summer (Goodhart, 1958; Davies and Snow, 1965; Cameron, 1969; Richardson, 1975; Tucker, 1988). An influx of migrating T. philomelos and other birds can cause a sudden increase in predation, as shown by Richards (1976) and Shachak et al.

By contrast, S. zonata, with a thicker shell, tended to be avoided by small mammals and had the same density on both slopes. In a study of T. seetzeni in a wadi in the Negev, Abramsky et al. (1990) demonstrated that population density was highest in the central drainage basin and decreased with altitude. Predation by rodents was correspondingly higher up the hillsides, where natural shelters for the animals are more abundant than in the wadi bottom. Thus, the distribution of T. seetzeni agrees with the hypothesis that predation pressure influences its population dynamics but, of course, other explanations are possible.

Canadian Journal of Zoology 62, 622–626. O. and Maser, C. (1976) Food habits of five western Oregon shrews. Northwest Science 50, 102–107. O. E. (1972) Food and ectoparasites of Indiana shrews. Journal of Mamalogy 53, 329–334. V. K. (1937) Enemies of the land and freshwater mollusca of the British Isles. Journal of Conchology 20, 351–361. X. (1951) Life-history studies of East African Achatina snails. Bulletin of the Museum of Comparative Zoology, Harvard 105, 295–317. Wimmer, W. and Winkel, W.

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