Patch colonization by Trirhabda canadensis (Coleoptera: Chrysomelidae): effects of plant species composition and wind |
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Authors: | P A Morrow D W Tonkyn R J Goldburg |
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Institution: | (1) Department of Ecology, Evolution and Behavior, University of Minnesota, 318 Church St. S.E., 55455 Minneapolis, MN, USA;(2) Present address: Department of Plant Biology, University of Minnesota, 55108 St. Paul, MN, USA;(3) Present address: Department of Biology, Clemson University, 29634 Clemson, SC, USA;(4) Present address: Environmental Defense Fund, 257 Park Avenue South, 10010 New York, NY, USA |
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Abstract: | Summary The goldenrod leaf beetle, Trirhabda canadensis, is known to respond to odors of host and non-host species in the laboratory. Here we report movements of T. canadensis in the field in response to volatile odors from monocultures and polycultures of host plants. Overall, beetles preferentially colonized plots with a higher density of host plants and lower diversity of allelochemicals, but under some wind conditions there were marked exceptions. At high windspeeds, they colonized whichever plot(s) was upwind. At low windspeeds, beetles colonized preferred plots even when they were not upwind. The data suggest that odor dispersion varies in a complex way with windspeed: at low windspeeds beetles received information from a wide are of vegetation and made choices while at high windspeeds information was available only from upwind plot(s). |
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Keywords: | Solidago altissima Trirhabda canadensis Host plant odors Insect host colonization Host finding Odor dispersion |
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