Some of the Effective Factors on the Nesting-site Selection of Breeding Birds in Zarrinkola Permanent Ab-bandan,

This study was carried out during May – September, 2003 during which some of the effective factors in breeding bird nesting-site selection were surveyed. There are significance differences among nest site selection, on the basis of ANOVA test, For among the seven studied species. Whiskered Tern (Chlidonias hybridus) (67%) preferred > 170 cm water depth for nesting, while Little Bittern (Ixobrychus minitus) (53%) selected a shallower depth of water. Maximum and minimum nesting depths from surface water level were related to Great Reed Warbler (Acrocephalus arundinaceus), and Whiskered Tern (C.hybridus) along with Little Grebe (Tachybaptus ruficollis), respectively. Whiskered Tern (C.hybridus) (40%) being highly dependent on vegetations, selected its nests around 0.25-0.5 m near to vegetation, while Little Grebe (T.ruficollis) avoided these regions. Nests of Common Moorhen (Gallinula chloropus), Little Grebe (T.ruficollis) and Little Bittern (I.minitus) were made in the further distances, whereas, Whiskered Tern (C.hybridus) and Great Reed Warbler (A.arundinaceus) preferred colonial nests and avoided (with varying distances) boat passage regions. Maximum overlap in habitat as by SHOENER,1970 Index (0.93) was observed between Little Bittern (I.minitus) with Common Moorhen (G.chloropus) as well as between Little Bittern (I.minitus) and Little Grebe (T.ruficollis), whereas, a minimum overlap between Great Reed Warbler (A.arundinaceus) and Little Grebe (T.ruficollis) habitats