The water-lilly leaf beetle Galerucella nymphaeae is a specialist herbivore of the floating-leaved Nuphar lutea. Floating leaves occur in patches with different densities. I studied experimentally the oviposition responses to spatially varying patch characteristics. In the manipulations I changed density of leaves, quality (as measured by the previous herbivory) of leaves and number of eggs laid on a leaf
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Jari Kouki (1991) studied this question.