Calidris alba

Written by on April 13, 2012 in Indonesia Bird with 0 Comments

Calidris alba, Sanderling,  Kedidi Putih

Calidris-alba

The Sanderling (Calidris alba, syn. Crocethia alba[1] or Erolia alba) is a small wader. It is a circumpolar Arctic breeder, and is a long-distance migrant, wintering south to South America, South Europe, Africa, and Australia. It is highly gregarious in winter, sometimes forming large flocks on coastal mudflats or sandy beaches.

It is somewhat unlike other sandpipers in appearance, which has led to the suggestion that it should be placed into a monotypic genus Crocethia. A more recent review (Thomas et al., 2004) indicates, however, that the sanderling is a fairly typical “stint” or small sandpiper and should be separated from the large knots with its closest relatives in a distinct genus.

This bird is similar in size to a Dunlin, but stouter, with a thick bill. It shows a strong white wingbar in flight, and runs along the sandy beaches it prefers with a characteristic “bicycling” action, stopping frequently to pick small food items. It eats small crabs and other small invertebrates. In spring, birds migrating north from South America consume large numbers of horseshoe crab eggs in the Delaware Bay area.

In spring, the birds arrive on the High Arctic breeding grounds (see map), where they lay 3–4 eggs in a ground scrape. On the nesting grounds, these birds mainly eat insects and some plant material.

The Sanderling is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.
The Sanderling is a small plump sandpiper, 18–20 cm in length. Its weight ranges from 40-100 g. The winter bird is very pale, almost white apart from a dark shoulder patch. This is the source of the specific name, alba, which is the Latin for “white”. Later in the summer, the face and throat become brick-red. The juvenile bird is spangled black and white, and shows much more contrast than the adult. Sanderling behavior is distinctive, but visually, if the size is misjudged, a breeding plumage sanderling can be mistaken for some varieties of stint, or a winter plumage sanderling can be mistaken for a Dunlin or Red Knot. It can be told from other small wading birds, given good views, by its lack of a hind toe.

Distribution, habitat and migration

The Sanderling breeds in the High Artic areas of North America, Europe and Asia. In North America it breeds in the Canadian Arctic Archipelago and Nunavut (and to a lesser extent Alaska), in Eurasia it breeds in Greenland, Spitsbergen, and areas of northern Russia from the the Taymyr Peninsula to the New Siberian Islands. In the northern winter it has a nearly cosmopolitan distribution across the world’s marine coasts. It is a complete migrant, travelling between 3,000 to 10,000 km from its breeding grounds to its wintering sites. Birds that travel further also arrive later and leave sooner. The majority of adults leave the breeding grounds in July and early August, whereas juvenile birds leave in late August and early September. The northward migration begins in March at the southern end of their winter distribution.[2]

The breeding habitat of the Sanderling is coastal tundra north of 5°C July isotherm. The species typically chooses nesting sites on dry stony areas near wet areas, from 60 m above sea level to 800 m. During the winter and its migration it is most commonly found on coastal sandy beaches, but also occurs on tidal sand flats mud flats and the shores of lakes and rivers. More infrequently it make occur on rocky shores.[2]

Breeding behaviour

Sanderlings are territorial, with the male aggressively defending its territory. They may either form monogamous pairs or polyandrous (one female and two male) pairings.

 

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