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In Ukraine the G reat C ormorant ( Phalacrocorax carbo Linnaeus, 1758) uses a rather wide range of habitats for nesting : islands, trees and shrubs, reedbeds and a variety of man-made structures. In general, th e strategy of nesting on man-made structures is uncommon both in Ukraine and Europe, and C ormorant s do this only in the absence of other sites suitable for nesting. Special research o n C ormorant colonies on technogenic constructions w as carried out during the field expeditions by the Research Institute of Biodiversity of T errestrial and A quatic E cosystems of Ukraine in 2002 – 2003 and 2012 – 2016. Besides this, we used retrospective and current data from the literature and I nternet resources. Most of the field work was carried out by making surveys by boat and on foot . As a result, we found 8 C ormorant colonies on technogenic constructions in Ukraine: gas platforms in the Sea of Azov (near the village Strilkove, Henichesk district of Kherson region); sunken ships – targets for bombing training near the Arabat Spit (th ese are also known as « ship i slands»); electricity pylons of the high-voltage Enerhodar Dnipro Power L ine where it c ross es the Kakhovka R eservoir; the doc k in Yahorlyk Bay k, used in the past as a target for bombing training bombing ; artificial island-platforms on L ake Chernine (Kinburn Peninsula); an artificial island on the Sasyk Lagoon (Odessa region); artificial islands, made as navigation mark er s on the Kremenchuk and Kiev reservoirs. The study found that in most cases the accompanying species was the Caspian G ull ( Larus cachinnans Pallas, 1811), which actively destroys the C ormorants ’ nests and eat s their eggs and chicks. The number of nests in the colonies varied greatly (5 – 30 nests on the navigation marker islands and ca. 2 000 – 2 300 on the « ship - islands » and gas platforms). This is due, primarily, to the area of the breeding territory. The research found that fierce territorial competition was observed in most of the colonies both with Caspian Gulls and between C ormorants. In addition, we observed anthropogenic interference in the colonies by fishermen and workers conducting routine maintenance work (as happened in the case of electricity pylons and gas platforms). The benefit of this study is that it is the first research in Ukraine conducted at national level on this type of nesting by C ormorants . M oreover, the study examines the history of emergence of these nesting territories and population dynamics of the G reat C ormorant from the time of initial settlement of the breeding sites till the present.

Nesting of Great Cormorants (Phalacrocorax carbo) on man-made structures in Ukraine