Richard Maack's Vilyui expedition in the study of avifauna and gallinaceous birds (Gallinaceae) of Eastern Siberia

The article is dedicated to the 170th anniversary of the Vilyuisk (Yakutia) expedition organised by the Siberian (Irkutsk) branch of the Imperial Russian Geographical Society (1853-1885). It was led by Richard Karlovich Maack (Germ. Richard Otto Maack), a Russian naturalist of German origin and explorer of Siberia and the Far East. It also contains some information on the Pribaikalia and Transbaikalia, taken along the way during the subsequent Amur (1855-1856) and Ussuri (1859-1960) expeditions. The route, dates, and composition of the expedition are described and the contribution of the scientist to various fields of natural science and, above all, to the study of vertebrates of the region is evaluated. Scientists have identified the habitat of amphibians and reptiles (4 species), birds (121), mammals (34), which is relatively large against the background of regional studies conducted in Eastern Siberia at that time. According to the lists of bird species published in the fundamental work of the scientist "Vilyuisky district of the Yakut region" [1883-1887], the distribution of 5 species of Gallinaceous birds (Gallinaceae) in the middle of the XIX century was revealed – Hazel Grouse, Western and Black-billied Capercaillies, Black Grouse, Willow Ptarmigan. For Transbaikalia and Pribaikalia, the habitat of two more species is noted - Gray and Bearded Partridges. The Common Pheasant was accounted for by R. K. Maack only in the Amur region and the Amur region (Far East). In general, over the century and a half of the history of studying Gallinaceous birds, their species composition has practically not changed in the researcher's work area. In Yakutia, it was replenished with species from the eastern and southern regions, living there Rock Partridge and Siberian Grouse. On the scale of Eastern Siberia, only the Pheasant is currently supplementing the Gallinaceous birds list as a new species in the region, documented in the south of Eastern Siberia – in the Eastern Sayan bordering the Baikal region and in some places of Transbaikalia (not yet precisely confirmed).

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