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Résumé :
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During the breeding seasons of 2001 and 2002 two comprehensive surveys of colonially breeding waterbirds (Pelicaniformes and Ciconiiformes) were carried out in both the Romanian and Ukrainian parts of the Danube Delta. Apart from being the first time in history that this internationally important area for these groups of birds was comprehensively surveyed, the aim of this study was to obtain insight in the crucial factors affecting site selection and population size of colonial waterbirds. In 2002, the year with the most complete survey, a total of 209 colonies was found, holding almost 40,000 breeding pairs of
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