Differences in the Energetics and Behavior
of Two Closely Related Gnawing Phyllophagous Insect Species
at the Northern Boundary of Their Range

I. A. Bogacheva

Institute of Plant and Animal Ecology, Ural Division, Russian Academy of Sciences,
ul. Vos’mogo Marta 202, Yekaterinburg, 620144 Russia

Received August 4, 1998

Abstract—Two widespread geometrid species at the northern boundary of their ranges are ecologically similar
in many respects. However, daily rhythms of feeding and the related temperature dependences of larval growth
rate are different, which is explained by phenological differences in the feeding of caterpillars in the center of
their range. The adaptiveness of their behavior in the southern Subarctic is discussed.

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