Abstract
We examined whether there is a link between feeding behavior and detoxification enzyme activity, which increases over time in proportion to the ingested dose of toxic allelochemicals. We hypothesized that, for insects consuming a toxic but nondeterrent food, consumption would initially decline but then increase after continuous exposure in conjunction with the induction of detoxification enzyme activity. We tested this hypothesis by observing the feeding behavior of fall armyworms (Spodoptera frugiperda) when offered diets containing indole 3-carbinol (I3C), a well-known inducer of detoxification enzymes in this species. The I3C concentrations used were toxic but nondeterrent, thereby avoiding any confounding influence of preingestive responses. The feeding pattern of caterpillars previously unexposed to dietary I3C (i.e. with basal detoxification enzyme activity) was substantially altered when offered I3C-containing diets. Compared with control caterpillars fed I3C-free diets, they exhibited fewer feeding bouts and had a greater proportion of long (> 60 min) non-feeding pauses between bouts. In contrast, the feeding pattern of caterpillars pre-exposed to an I3C diet (i.e. with induced detoxification enzyme activity) did not differ from that of control caterpillars. We conclude that there is a relationship between feeding behavior and detoxification activity in these caterpillars, and propose two postingestive mechanisms that could link these processes.
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Glendinning, J.I., Slansky, F. Consumption of a toxic food by caterpillars increases with dietary exposure: support for a role of induced detoxification enzymes. J Comp Physiol A 176, 337–345 (1995). https://doi.org/10.1007/BF00219059
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DOI: https://doi.org/10.1007/BF00219059