By Barker, G. M. (Eds.)
This publication, which incorporates 15 chapters, attracts jointly the on hand details at the variety of organisms that represent the usual enemies of terrestrial gastropods. In a sequence of evaluation chapters, it offers an authoritative synthesis of present wisdom and learn for predators, parasites and pathogens. This publication is for either scholars and pros all in favour of the conservation of gastropod groups in traditional habitats and administration of pestiferous species. on hand In Print
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Additional info for Natural enemies of terrestrial molluscs
Natural Enemies of Terrestrial Molluscs (ed. M. C. e. scavenging). , 2002a). The significance of a predation event should ideally be judged in the light of these factors, but in practice such information is rarely available. At one end of the spectrum, a beetle may be offered a gastropod in a no-choice situation, which it will either kill and consume, and subsequently survive, or it will not kill and therefore die of starvation. If predation occurs, the predator is shown to be capable of capturing and consuming that particular size and species of gastropod under the conditions (usually highly artificial) provided.
Allen 24 has pointed out, the actions of over-zealous shell-collectors in Hawaii over the past 100 years has led to the extinction of certain species of slow-growing, low-fecundity achatinellinid tree snails. Of course, in addition to such direct ‘predation’, a wide variety of other human activities, in particular, habitat destruction, are having a devastating effect on terrestrial gastropod populations worldwide. Conclusion A recurring theme in this survey is the paucity of adequately designed quantitative studies on avian and mammalian predation.
Graveland, J. (1996) Avian eggshell formation in calcium-rich and calcium-poor habitats: importance of snail shells and anthropogenic calcium sources. Canadian Journal of Zoology 74, 1035–1044. Graveland, J. and van Gijzen, T. (1994) Arthropods and seeds are not sufficient as calcium sources for shell formation and skeletal growth in passerines. Ardea 82, 299–314. Graveland, J. and van der Wal, R. (1996) Decline in snail abundance due to soil acidification causes eggshell defects in forest passerines.