ИСТИНА

Shorebirds typically are spread over vast areas on their breeding grounds which makes their population monitoring there impossible or complicated with few exceptions. Only one long-term study exists since mid-1990s that involves monitoring of breeding densities of shorebirds on SE Taimyr, and a special monitoring project for the Spoon-billed Sandpiper started from early 2000s in Chukotka. These cannot supply data about the population trends of the great majority of species across their extensive breeding ranges. A bulk of faunistic literature with data on species distribution and abundance collected mostly during the 20th century represents another source of information about the population trends. This source has been used for generalizing information for the ‘Atlas of breeding waders in the Russian Arctic’ (Lappo et al., 2012). The obtained results are skewed in favour of positive trends in the breeding ranges and populations because these can be easier recorded by observers. However, information is still lacking for most species. When revealed, positive trends were found in 9 species breeding in northern East Siberia with only 4 of them following the EAAF (Tringa glareola, Xenus cinereus, Calidris subminuta, C. acuminata); 6 species had negative trends with most of them (n=5) following the EAAF (Haematopus ostralegus osculans, Eurynorhinchus pygmeus and some populations of Plivialis squatarola, Charadrius mongolus and Calidris alpina). In addition it is known from Russian literature that father south breeding populations of Tringa guttifer and locally Numenius madagascariensis also declined, while population of only Gallinago hardwickii increased.