Factors influencing the formation of nesting bird communities in the villages in the Upper Dnister basin
Authors: Bokotey А.A.
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The investigations were carried out since 1997 till 2000 during the nesting periods in three experimental areas in the Upper Dnister basin, viz. in 50 villages (255-310 m alt.) in the Upper Dnister lowland, in 17 - in the Upper Dnister Beskydy (650-750 m alt.) and in 17 - in the Skolivski Beskydy (1100-1300 m alt.). 56 bird species were recorded in the villages of the Upper Dnister basin with general density of population amounting to 300,1 pair/km2 . The population structure includes 33 species where House Sparrow dominates and Swallow – subdominates. In comparison with natural biotopes, the avifauna of villages is greatly affected by the anthropogenic factor which favours the fact that synanthropic species nest only there. They are House Sparrow, Swallow, House Martin, Swift, Jackdaw, Black Redstart, Rock-Dove, White Stork. Phytocenotic conditions considerably influence the life of birds in villages, where vegetation sharply differs from that of the surrounding biotopes and that fact highly affects the structure and abundance of avifauna. Both the structure and the quantity of avifauna depend on the altitude of a settlement situation. With growing altitude the species diversity of birds decreases (55, 54, 45 species) and their abundance increases (292,3; 387,3; 401,6 pair/km2 ). The diversity decreases due to the plain inhabitants which have their vertical distribution limit within the study area, those are White Storc, Syrian Woodpecker, Garden Warbler, Marsh Warbler, Thrush Nightingale, Rook.