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Research was carried out between the years 1979 and 1990 in two types of habitat: retention reservoirs and low bogs of the carbonate type. Checks of nests made every 5-10 days. Treated as separate categories in this work were the success of an individual nest (72%) and the final success of a pair in a given season (78%). At retention reservoirs, the main cause of losses was predation by birds, while...
Studies were carried out in two types of habitat at retention reservoirs (1979-1986, 2 areas covering 616 ha in total) and on low bogs of the carbonate type (1986-1988, 1990 and 1992, 3 areas covering 1049 ha in total). Studies involved annual counts of the breeding population, and frequent checks on nests. In 6-7 years, breeding population increased in all areas by 17-179%. Maximum densities were...
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