Abstract
In this study, we present the results of our monitoring activity on the bird fauna of three reservoirs (Galbeni, Răcăciuni and Berești), located in the middle basin of Siret River and part of ROSPA0063 Buhuși – Bacău – Berești Nature 2000 site. Our study began in June 2022 and ended in May 2023, following the dynamic of bird fauna during the breeding season, migration, and wintering time. We identified 152 bird species in the investigated area, and we present quantitative data for each studied reservoir. The breeding populations are small, but these three reservoirs shelter significant waterfowl population during the migration and wintering time. We notice the relevance of this territory as flyway for white stork (Ciconia ciconia) and raptor birds (Accipitriformes, Falconiformes) in the eastern Romania. We mention the presence of 39 protected bird species through Annex 1 of Birds’ Directive. We recorded 30 bird species mentioned in the Romanian Red Book of Vertebrates, including four which are considered critically endangered bird species: Pelecanus crispus, Haliaeetus albicilla, Clanga clanga, and Milvus migrans. We also give data about trends of the bird species in comparison with similar studies done more than two decades ago in this perimeter. We identified the main threatening risks for the bird fauna, and we assess the level of anthropogenic impact on the presence of bird species in the area.