ABOUT EFFECT OF NATURE PROCESSES ON FORMING OF FAUNA OF FISHES, BIRDS, AND THEIR PARASITES AT THE LAKE BAIKAL
A connection between paleogeographic occurrences in Neogene and Quaternaty at Lake Baikal and a forming of faunal complexes of fishes, birds, and their parasites was analyzed. Contents of fish parasites confirms that endemic Baikalian Cottoidei have the most long-term isolation in Baikal while fishes of a boreal plain complex inhabit the lake relatively little time and might have invaded here several times. Recent contents of waterbirds and shorebirds presents evidences on stressed conditions for their life in the Baikal region and significant variability of their fauna through climatic cycles in Pleistocene because of periodical invasions by birds to Baikal.