Breeding biology and territorial behavior of common sandpiper Actitis hypoleucos L. inhabiting the coast of Ladoga lake

Collected in 1990-2007 monitoring data on the local population of Common Sandpiper Actitis hypoleucos inhabiting the eastern coast of Ladoga Lake are summarized. 140 adult species (45 % of them returned to the coast every 1-7 years) and 432 nestlings (141 broods) were marked individually The number of nesting birds varied every year from 2,6 to 6,3 pairs/km of the coastline. A period of egg-laying started (n = 269) on the 7.05-23.06, a hatching period (n = 250) - 2.06-12.07. Both partners covered the eggs. Male species left their nests inclusive the ones with eggs up to the 10th of July. Female species guarded the nests until the broods’ complete dissociation. The latest observation was registered on the 30th of July in 2001. The younglings left their parents 17-24 days after they hatched. They united in small groups with a non-regular structure. The amplitude of their movement gradually increased. The younglings that hatched later left their nests on the controlled coast of the lake in late July or early August (the latest observation - 4.08.2001).