Abstract
Abstract Xylocoris flavipes (Reuter), the warehouse pirate bug, is a predator of many stored-products pests. This study compared the functional response of X. flavipes with different densities of the prey species Tribolium castaneum (Herbst), Oryzaephilus surinamensis (L.), Plodia interpunctella (Hubner), and Rhyzopertha dominica (F.) in two different habitats: empty glass jars and glass jars filled with wheat kernels that were designed to simulate more natural conditions in stored grain. Differences in the functional response of X. flavipes to all combinations of prey densities and grain conditions were compared with the predicted functional response curves from Holling’s type I and type II models, and to Hassell’s type III model. The functional response of X. flavipes was best described by Holling’s type II model, but a type III response occurred with prey that were more difficult to subdue, such as T. castaneum larvae. Numbers of prey attacked by females were greater than those attacked by males (P < 0...
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