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numerical responses

International Journal of Tropical Insect Science (1)

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Functional and Numerical Responses of Cheilomenes lunata (Fabricius) (Coleoptera: Coccinellidae) Feeding on the Cowpea Aphid, Aphis craccivora Koch (Homoptera: Aphididae)
T. I. Ofuya, A. E. Akingbohungbe
Journal:

Insect Science and Its Application / Volume 9 / Issue 4 / August 1988

Published online by Cambridge University Press:

19 September 2011, pp. 543-546

Print publication:

August 1988
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The density responsiveness of larvae and adults of Cheilomenes lunata (Fabricius) preying on Aphis craccivora Koch was investigated under laboratory conditions where temperature and relative humidity were uncontrolled and fluctuated between 24–30°C and 43–90% respectively. The feeding rates of C. lunata were positively correlated with the population density of prey. The number of prey consumed daily by each predator stage tested, increased more steeply at lower, than at higher prey densities, exhibiting thus the Type II functional response. Fecundity of C. lunata females also increased to a plateau with increasing prey density.