Abstract
In the dry heathlands of the Limoges region of France, Chorthippus binotatus differs from allied graminivorous species by its diet specialization, composed of dwarf gorse bush (Ulex minor). Nymphal stages exclusively feed on leaves. Adults become florivorous at the season's end. The preference for Ulex bushes versus grasses involves recognition of host plant architecture, and particularly the angle of the axes (branches, stems). Sugar sensitivity and odor discrimination experiments at the end of season showed that adults are more attracted by sucrose and fructose than by glucose or water. HPAEC-PAD analyses of different plant organs revealed that soluble sugar content of Ulex (especially U. minor) flowers is greater than Ulex shoots and stems and leaves of grasses. These results partly explain the consumption of U. minor rather than U. europaeus. The temporal shift toward flowers is explained by the sweet taste and the yellow color. The interest for sucrose and yellow is enhanced during the season and is the result of learning.
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Picaud, F., Gloaguen, V. & Petit, D. Mechanistic Aspects to Feeding Preferences in Chorthippus binotatus (Acrididae, Gomphocerinae). Journal of Insect Behavior 15, 513–526 (2002). https://doi.org/10.1023/A:1016381200725
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DOI: https://doi.org/10.1023/A:1016381200725