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Evasive Mimicry Involving a Butterfly Model and Grasshopper Mimic
T. G. Balgooyen
The American Midland Naturalist
Vol. 137, No. 1 (Jan., 1997), pp. 183-187
Published by: The University of Notre Dame
Stable URL: http://www.jstor.org/stable/2426768
Page Count: 5
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On the eastern slope of the Sierra Nevada Mountains, near Truckee, California, a pierid, alfalfa butterfly (Colias eurytheme Boisd.) provides an edible but evasive model for a mimic, the short-horned grasshopper (Arphia conspersa Scudd). Estimates of numerical densities of each species favor the grasshopper mimic by 2- to 4- fold which is inconsistent with predictions from Batesian and evasive mimicries. However, because behavioral differences visually expose the model butterfly, C. eurytheme, 95.8% more than its grasshopper mimic, A. conspersa, a basic tenet of mimicry is upheld-the predator encounters the model more frequently than the mimic.
The American Midland Naturalist © 1997 The University of Notre Dame