L. Forró szerk.: Miscellanea Zoologica Hungarica 12. 1998 (Budapest, 1998)

Bankovics, A.: Distribution data of wildfowl (Aves: Anatidae) in the Khangai Mountain in Mongolia

Tufted Duck (Aythya fuligula Linnaeus 1758) It was the most abundant species among the diving ducks at Bajan Obo exceeding the number of the Pochard. At the time of the observation - 15-17 June - they appeared in flocks on the lake at Bajan Obo. In one of the groups there were 18 males and 7 females on 15 June. There were 2 flocks of 16 and 28 individuals on the following day. They were probably still migrants, but beside them there were a pair that seemed to search for a nesting place along the floating island. Common Goldeneye (Bucephala clangula Linnaeus, 1758) A few individuals occurred at Bajan Obo probably still passage migrants. Their data are as follows: 2 drakes on 15 June and a small flock of 7 (6 drakes and 1 duck) on 16 June. Goosander (Mergus merganser Linnaeus, 1758) This species prefers the higher altitudes. It was more numerous in Mandai region along the rivers and on the ice marshes. There was a maximum number of 14 birds in this area. They appeared mostly in single females, in smaller female groups or in pairs between 6-15 June at Mandai. Only one record at Bajan Obo: 1 male on 16 June. Acknowledgement Thanks are due to the other members of the expedition, namely Győző Buzetzky, Béla Kalocsa and Imre Karáth for their help in the fieldwork and especially the Hungarian Academy of Sciences for sponsoring the expedition. References del Hoyo, J., Elliott, A. Sargatal, J. (eds) (1992): Handbook of the Birds of the World. - Vol.1, pp. 1-696. Lynx Edicions, Barcelona. Mauersberger, G. (1979): Ökofaunistische und biologische Beiträge zur Avifauna Mongolica. I. Allgemeiner Teil und Podicipediformes bis Galliformes. - Ann.Orn. 3: 99-126. Novak, E. (1970): The Waterfowl of Mongolia. - Wildfowl 21: 61-68. Piechocki, R. (1968): Beiträge zur Avifauna der Mongolei. Teil I. Non-Passeriformes. - Mitt. zool. Mus. Berlin 44: 149-292. Piechocki, R. & Bolod, A. (1972): Beiträge zur Avifauna der Mongolei. Teil II. Passeriformes. - Mitt. zool. Mus. Berlin 48: 41-175. Vaurie, C. (1964): A Survey of the Birds of Mongolia. - Bull. Amer. Mus. Nat. Hist. 127: 103-144. Author's address: Dr. Attila Bankovics Department of Zoology Hungarian Natural History Museum H-1088 Budapest Baross u. 13. Hungary E-mail : bankovic @ zoo.zoo.nhmus.hu