Acta Zoologica Cracoviensia, 27() 1984
The Mute Swan Cygnus olor (Gmelin 1789) on Lake Łuknajno (North-eastern Poland)
Abstract:
The population of Mute Swans on Lake Łuknajno consists of breeding birds (on the average c. 20 pairs), flocks of non-breeding, moulting birds, which numbered as many as 1756 specimens in 1968, and spring and autumnal migrants (c. 1000 birds in the autumn). The number of breeding birds was found to be on the increase, which manifested itself by their colonial nesting on the island. A fall in the size of non-breeding flocks observed in the last few years is connected with a change in the habits of the Swans, which have begun showing a preference for the littoral shallows of the Baltic.
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