ECOLOGICAL RESEARCH-STUDIES REGARDING THE AVIFAUNA DURING THE HIEMAL PERIOD FROM THE BASINS AREA OF THE ARGE RIVER BETWEEN 2000 AND 2010

The basins from the middle and upper part of the Arge River are included in “The Basins of the Arge River”, site ofthe Nature 2000 Network and Important Bird Area. The paper show some results of the International Waterbird Count,organized on international level by the Wetland International and on national level by the Romanian OrnithologicalSociety. The analyze was performed only for 2000 – 2010 period, the researches in area being done after 1990. 116994individuals and 73 birds’ species, which belong to 14 orders, were recorded. Regarding the number of families the bestrepresented was the Passeriformes order. 9 species are protected by the Annex I of the Birds Directive. In the area ofthe Pite ti Basin was observed the majority of the number of species and in the area of the Gole ti Basin was registeredthe biggest number of the observed individuals. The Anseriformes order had the most of observed individuals, on thefirs place being Anas platyrhynchos. The best similarity was between Pite ti and Budeasa basins (by Bray-Curtis index)and between Valcele and Budeasa basins (by Jaccard index). For the whole period, Anas platyrhynchos was the onlydominant species (by index of relations). Considerations are also effectuated in relation with other few ecologicalindexes.