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Lawrey, JD 1983: Lichen herbivore preference: a test of two hypotheses. - American Journal of Botany 70: 1188-1194. [RLL List # 119-87 / Rec.# 11198]
Keywords: HERBIVORES/ ELEMENTAL ANALYSIS/ FEEDING PREFERENCES/ SLUG/ PALLIFERA/ CHEMISTRY/ AVOIDANCE BEHAVIOR/ ANIMALS/ ADAPTATIONS
Abstract: 5 tables. 1 figure. [Nonrandom grazing by the slug Pallifera varia was studied to test the avoidance and preference hypotheses. "Results suggest that preferred lichens had significantly lower concentrations of N, P, and Ca, and that avoided lichens produced secondary products that effectively inhibited Pallifera grazing activity. These results suggest that the avoidance hypothesis was the better explanation for nonrandom Pallifera grazing patterns. Furthermore, they suggest that lichens with the highest concentrations of essential elements are most likely to produce defense compounds, an observation that supports predictions to explain patterns of chemical defense in vascular plants."]

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