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A comparison of studies on the distribution and breeding efficiency of the White Stork in the Łęczyca District in 1968-1970, 1975 and 1984 is presented. In the analysed period, there occurred a significant increase in the abundance of nests not occupied by pairs (HO + HB) and in nests built on the poles of electric traction. The spatial distribution of stork nests is described. Besides, the author proves the limiting influence of interspecific com petition on the breeding success of the stork in the distinguished groupings of nests.
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