Abstract
Parameters of potential, optimal and sub-optimal habitats of Coot and Great-crested Grebe were established based on measurements of nest-site characteristics. Nest-site selection is determined by an intricate interaction of vegetation density, water depth, distance to the open water, diameter of a shore-belt of halophytes, as well as ecomorphological peculiarities of a species. A conclusion is made that major criteria are nest resistance to the impact of waves, possibility to reach a nest by water unobstructed, and a breeding bird's safety. The impact of structural peculiarities of a zone of halophytes to the above parameters of a nest-site on lakes of different succession stages was estimated.
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