Birds Girdling Activity on Exotic Tree Species as a Form of Adaptive Behavior ? 1

Abstract

⎯Four tree species in the Kostelec n. Č. l. arboretum (Czech Republic) have been repeatedly damaged by Dendrocopos medius. The unique aspect of this otherwise common behavior called girdling consists in regularly visiting the same trees every spring, although there are more than 1.200 tree species within the arboretum. We monitored transpiration, leaf… (More)

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