Changes in species composition of waders in western Ukraine during the historical period of zoological research

Introduction. Information on historical changes in the fauna of geographical regions and biota habitats is important for understanding the processes that take place in ecosystems. The results of such an analysis in combination with modern research can indicate not only the global trends in changes of animal associations and the status of particular populations of species, but also reveal the reasons that caused the situation. Materials and discussion. The first lists of bird species in the 18th – early 19th centuries showed the nesting of 12 species of waders. However, during the 19th century 37 species of waders were found, 12 of which were nesting. 13 wader species were permanent migratory and 8 – rare migratory species. In the first half of the 20th century, there were 27 species of waders on the territory of Prykarpattia, and 25 in Volyn, among which there is a larger list of migratory and vagrant species in the foothills of the Carpathians. In the second half of the 20th century, 39 species of waders were described within the western regions of Ukraine, of which 17 were nesting, and four of them were recorded during the last decade. Conclusions. There are 42 species of waders (39 of them are recent) registered in the western part of Ukraine. Among them 17 species are nesting, 15 – migratory and seven – vagrant species. During the 20th–21st centuries, 23 species of waders, including only 7 nesting species, have not changed their status of stay. However, it has changed for 17 species: two species have disappeared; four – have become vagrant; the Ruff Calidris pugnax and the Marsh Sandpiper Tringa stagnatilis have changed their status from nesting to migratory. The Northern Lapwing Vanellus vanellus, the Green Sandpiper Tringa ochropus and the Wood Sandpiper T. glareola that were common, somewhere numerous bird, – have become few in numbers; and the Great Snipe Gallinago media and the Black-tailed Gotwit Limosa limosa – have become rare. The Jack Snipe Lymnocryptes minimus has become migratory. The nesting of sandpipers, with a southern area of distribution, in the western regions of Ukraine proves the fact of the global warming. However, the drop of the water level, drying out of wet meadows and swamps and, as a consequence, plant succession, have terminated the nesting of such species as the Ruff and the Marsh Sandpiper; the Black-tailed, the Great Snipe and the Wood Sandpiper become rare; the Northern Lapwing and the Green Sandpiper have become much less numerous.