CORRELATES OF WING MORPHOLOGY WITH FORAGING BEHAVIOR AND MIGRATION DISTANCE IN THE GENUS PHYLLOSCOPUS

Wing size and shape variation in thirteen species of Old World leaf wa rblers, genus Phylloscopus, were examined using wing formulae and prin cipal components analysis. Data were taken from male individuals in br eeding populations in Northern India and Japan. Species with longer wi ngs migrate further and holler less than species with shorter wings. S pecies with more pointed wings migrate further and are more arboreal t han species with rounder wings. Findings agree with those from previou s studies on the genus Phylloscopus. Both foraging behaviour and migra tion distance have affected wing size and shape evolution in the genus .