Incorporation of the Biological Marker Rubidium in Gypsy Moth (Lepidoptera: Lymantriidae)and Its Transfer to the Predator Carabus nemoralis (Coleoptera: Carabidae)

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Abstract
Gypsy moth, Lymantria dispar (L.), adults and fourth instars reared from first instar on diet enriched with 3 g rubidium cloride (RbCl) per liter acquired the rubidium (Rb) tag without affecting their phenology or survival. The tag was retained in fourth instars at significant levels for 5 d after removal from the Rb-enriched diet. Loss of Rb after transfer from Rb-enriched diet to diet without Rb was described by a nonlinear regression model of the log of Rb concentration against days after transfer. Adult Carabus nemoralis Müller that consumed Rb-tagged fourth instars acquired the tag. Rb concentration in the beetles was positively correlated with the number of larvae eaten and negatively correlated with the number of days since feeding.

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