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THE EFFECT OF PREY DEFENSE ON THE FUNCTIONAL RESPONSE OF PODISUS MODESTUS (HEMIPTERA: PENTATOMIDAE) TO DENSITIES OF THE SAWFLIES NEODIPRION SWAINEI AND N. PRATTI BANKSIANAE (HYMENOPTERA: NEODIPRIONIDAE)

Published online by Cambridge University Press:  31 May 2012

Walter Tostowaryk
Walter Tostowaryk
Affiliation:
Forest Research Laboratory, Canadian Forestry Service, Quebec, Quebec and Department of Entomology and Limnology, Cornell University, Ithaca, New York
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Abstract

Experiments were carried out to determine the functional response of Podisus modestus (Dallas) to densities of two colonial species of jack pine sawfly, Neodiprion swainei (Middleton) and N. pratti banksianae (Rohwer). Two types of functional response curve were exhibited by the pentatomids, a domed response curve and a negatively accelerated curve.The domed response was caused by the more effective defense reactions of the sawfly larvae at higher densities.An equation is proposed for the domed response curve. The implications of the domed functional response are discussed in relation to the social behavior of these sawflies.

Type
Articles
Information
The Canadian Entomologist , Volume 104 , Issue 1 , January 1972 , pp. 61 - 69
Copyright
Copyright © Entomological Society of Canada 1972

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