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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/20113

Title: Factors Influencing Predation of the Waterbugs Sphaerodema annulatum (Fab.) and S. rusticum (Fab.) on the Disease Transmitting Snail Lymnaea (Radix) luteola (Lamarck)
Authors: Roy, J. K.
Raut, S. K.
Keywords: waterbug - snail predation - India
Issue Date: 31-Dec-1994
Publisher: Fundação Oswaldo Cruz, Fiocruz
Citation: Memórias do Instituto Oswaldo Cruz (ISSN: 1678-8060) Vol 89 Num 1
Abstract: Variations in the rate of predation of the waterbugsSphaerodema annulatum   and S. rusticum on the snails Lymnaea (Radix) luteola have been noted in respect to the morphs of the waterbugs, size of the prey individuals, densities of prey and predators, temperature and surface area of the waterbody concerned and the seasons. Consumption rate was highest (7.2 and 2.2 individuals per day per individual of S. annulatum and S. rusticum, respectively) in pre-reproductive ages of the waterbugs. This was followed by a gradual decline with the increase in age of the predators. The consumption rate was gradually higher with the increase of temperature from 20 C to 35 C The bugs failed to survive beyond 35 days at 35 C Though the bugs prey upon the snails of all sizes preference for 6.5 x 4.5 mm to 8 x 5 mm individuals by S. annulatum and for 5 x 3 mm to 6.5 x 4.5 mm individuals by S. rusticum is established. The waterbugs, irrespective of species, consumed the snail individuals belonged to 3 x 2 - 4 x 3 mm size group maximum when supplied separately. The rate of predation gradually declined with the rise of predators density irrespective of waterbug species. Predation rate increased with increasing prey density. This was level off when the prey snails were 1100 and 700 in number for S. annulatum and S. rusticum respectively. An adult S. annulatum and S. rusticum consumed 5.04, 3.7, 1.43 and 3.36, 2.49, 1.04 snails per day respectively in summer, monsoon and winter.
URI: http://hdl.handle.net/1807/20113
Other Identifiers: http://www.bioline.org.br/abstract?id=oc94003
Rights: Copyright 1994 Memorias do Instituto Oswaldo Cruz.
Appears in Collections:Bioline International Legacy Collection

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