black sea red data book - Department of Biology

Population trends.
Numbers are fluctuating. A general decline has been recorded. Only two out of four
existing colonies have stable numbers and favourable breeding conditions. The
numbers of Caspian terns are critical and colonies are likely to disappear.
Threats.
Disturbance and unfavourable weather conditions leading to overcrowding.
Conservation measures taken. One of the two main colonies is in a reserve
protected.
Conservation measures proposed. Obligatory protection of all breeding colonies.
References
Kistiakivs'ki, O .B., 1957. Fauna of Ukraine. Birds. Kiev, AN USSR 4: 432 pp.tin
Russian).
Kostin, Y. V., 1983. Birds of the Crimea. 241 pp. (in Russian).
Siokhin V. D., 1.1. Chernichko & T. B. Ardamatskaia et al., 1988. Colonial
Hydrophilic Birds of the South of Ukraine: Charadriformes. Kiev, Naukova Dumka:
176 pp. (in Russian).
Red Data Book of Ukraine, 1994. 356 pp.
Compiled by V. Siokhin.
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