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Passerine birds use a variety of indirect cues to make territory location decisions. These birds can also distinguish herbivore-damaged plants from undamaged ones during foraging, even when they cannot see the herbivorous larvae or damaged leaves. To test the possibility that also the territory choice of passerines is affected by herbivore- induced plant cues, we established territories with and without indirect cues of herbivore presence for migratory pied flycatchers (Ficedula hypoleuca) at the time of their arrival. Half of the territories had folivorous moth larvae hidden inside mesh bags to defoliate small trees (Betula spp.) and half had only empty mesh bags on trees. Hidden herbivory on the trees did not affect the mean date of territory choice by either male or female birds. Nonetheless, there was a trend that females, but not males, chose the territories in the same order in two consecutive years. Thus, it seems that pied flycatchers do not use indirect cues of larval presence as a basis for their choice of territory, but possibly some more general environmental cues.

Territory Choice of Pied Flycatchers is Not Based on Induced Cues of Herbivore Damaged Trees~!2010-04-09~!2010-06-01~!2010-07-20~!