Specific features of the territorial behavior of Sylvia warblers at the northern periphery of their ranges (southern Karelia)

The spatial and ethological structure of populations and territorial behavior of Sylvia warblers have been studied at the northern periphery of their nesting ranges (southern Karelia). It has been found that under these conditions the warblers form sparse populations, with individual pairs occupying large territories, and their behavior is characterized by minimization of territorial expenditures (relatively brief vocalization and the absence of aggressive interactions).