Olfactory <Emphasis Type="Italic">versus</Emphasis> Contact Cues in Host Plant Recognition of a Monophagous Chrysomelid Beetle |
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Authors: | Annette Heisswolf Dirk Gabler Elisabeth Obermaier Caroline Müller |
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Institution: | (1) University of Würzburg, Field Station Fabrikschleichach, Glashüttenstrasse 5, D-96181 Rauhenebrach, Germany;(2) University of Würzburg, Julius-von-Sachs-Institute for Biosciences, Julius-von-Sachs Platz 3, D-97082 Würzburg, Germany;(3) Present address: Department of Animal Ecology and Tropical Biology, Am Hubland, University of Würzburg, Biocenter, D-97074 Würzburg, Germany;(4) Present address: Department of Chemical Ecology-W1, University of Bielefeld, D-33501 Bielefeld, Germany |
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Abstract: | The importance of olfactory versus contact cues for host plant recognition was investigated in the tortoise beetle Cassida
canaliculata Laich. (Coleoptera: Chrysomelidae), which is strictly monophagous on meadow sage. The reaction of adult beetles
to olfactory and contact host cues was tested using three bioassays (locomotion compensator, six-chamber-olfactometer, ‘stem
arena’) to account for different behavioral contexts. Bioassay-guided fractionation of plant extracts was elaborated to characterize
the nature of contact stimuli. The beetles were only slightly attracted to odors from small amounts of leaf material. However,
when contact cues were provided additionally, the beetles showed strong preferences for samples of their host plant over controls.
Bioassay-guided fractionation led to isolation of at least two non-polar contact stimuli acting in concert that are sufficient
for host plant identification in C. canaliculata. |
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Keywords: | locomotion compensator olfactometer bioassay-guided fractionation stem arena host recognition |
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