| Summary: | Data on long-term observation and morphological study of the eggs of the great black-headed gull Larus ichthyaetus in the nesting colonies of gulls on islands of Lake Chany.Russia. Data on long-term observation and morphological study of the eggs (Data S1) and chick (Data S2) of the great black-headed gull Larus ichthyaetus in the nesting colonies of gulls on islands of Lake Chany, Russia Abstract This data set describes the long-term observation and morphological study of the eggs of the great black-headed gullLarus ichthyaetusin the gull nesting colonies on the islands of Lake Chany. Lake Chany is located in the Baraba forest-steppe of the West Siberian Plain, Russia, between the Ob and Irtish rivers. Lake Chany is protected by the Ramsar Convention on the Wetlands of International Importance, indicating that the lake is an important site for migratory birds, includingL. ichthyaetus. This dataset contains the size and fate of all eggs, as well as the size of hatched chicks in 1164 observedL. ichthyaetusnests from 1993 to 2003.
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