Abstract
Was investigated the relation of interspecific and intraspecific aggressive contacts of Collared Flycatcher (Ficedula albicollis) and Spotted Flycatchers (Muscicapa striata) in natural and anthropogenically transformed areas of forest-steppe zone of Ukraine. Interspecific aggressive interactions dominate in percentage but the frequency of intraspecific aggression is greater than of interspecific one. The frequency of interspecific aggression of Collared Flycatcher in artificial planted forests is higher than in nature. Percentage and frequency of aggressive interactions for Spotted flycatcher on the studied area were not significantly different. We carded out the success rate of aggressive reaction in defense and attack. The success of all aggressive interactions of Collared Flycatcher increases from natural to anthropogenically transformed territory. Increase in successful defense is marked for Spotted flycatcher. We made a list of species at which flycatchers react aggressively. The obtained results can be used as possible options for how flycatcher will demonstrate aggression in one or another type of the environment.
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