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réponse numérique

International Journal of Tropical Insect Science (1)

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Functional and Numerical Responses of Coccinella transversalis Fab. and Cheilomenes sexmaculatus Fab. Feeding on the Melon Aphid, Aphis gossypii Glov.
R. Veeravel, P. Baskaran
Journal:

Insect Science and Its Application / Volume 17 / Issue 3-4 / December 1997

Published online by Cambridge University Press:

19 September 2011, pp. 335-339

Print publication:

December 1997
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The functional response in terms of prey consumption and numerical response in terms of number of eggs laid by individual female adult predators of Coccinella transversalis Fab. and Cheilomenes (Menochilus) sexmaculatus Fab. (Coccnellidae: Coleoptera) at varied prey (Aphis gossypii Glover) (Aphididae: Homoptera) densities were investigated under laboratory conditions. The feeding rate by individual predators increased at increased prey densities, with both the coccinellids showing the Type II functional response. One hundred percent prey consumption was observed up to an initial prey density of 50 and 20 for Co. transversalis and Ch: sexmaculatus respectively. The fecundity of Co. transversalis increased at higher prey densities, but that of Ch. sexmaculatus remained unchanged.