Worldwide Species Action Plans

Sanderling action planThe Sanderling (Calidris alba) is a small shorebird that breeds in the high arctic and migrates to temperate, tropical, and south-temperate beaches. In North America, the Sanderling is classified as a Species of High Concern because of its significant population declines, widespread habitat loss, and the threats it faces during the nonbreeding seasons (migration and winter). The Sanderling has a circumpolar breeding distribution, however there is little morphological differentiation among breeding populations. In contrast, some differentiation of individuals occurs on the nonbreeding range. Only one race of Sanderling is recognized. This species uses three major migration flyways in the Americas: Pacific, Central, and Atlantic. The largest North American concentrations of Sanderlings occur during spring migration, where tens of thousands of birds gather on the mid-Atlantic coast (coastal beaches of Delaware Bay) and at shallow alkaline lakes in the Canadian Prairies (Saskatchewan). Other large spring concentrations also occur on the central coast of North Carolina (Dinsmore et al. 1998, Walters 1984) on outer coastal sandy beaches of central Oregon, and southern Washington (Myers et al. 1984b, 1984b) and in Alaska (Isleib 1979). Fall migration in North America is more protracted, extending from mid-July to late October (or November), with birds being generally less aggregated in space. However, some Sanderlings aggregate in Massachusetts (up to 17,000 individuals), New Jersey (8,000), Virginia (several sites with 17,000), Texas (8,400), and Washington (10,000) (International Shorebird Survey database). Otherwise, Sanderlings spread out during fall, moving through important sites along the Great Lakes shorelines and all along Pacific and Atlantic coastlines. During winter, Sanderlings are dispersed, and a pronounced site fidelity in most locations and territoriality by many individuals likely influence population structure.

  1. Calidris alba rubida
  2. ne Siberia, Alaska, n Canada
  3. Calidris alba alba
  4. Ellesmere I., n and e Greenland, Svalbard, Franz Josef Land and Taymyr
  5. Calidris alba
  6. NA, EU n

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