Acta Zoologica Cracoviensia, 21() 1976
The Spring Migration of Birds at the East Part of Polish Baltic Coast Operation Baltic paper No. 27
Abstract:
Material collected by the method of visual observation and catching birds in nets during their spring migration on the Hel Peninsula in 1963-1967 and on the Mierzeja Wiślana (Vistula Spit) in 1966-1967 is presented. The three main parts of the paper provide the author´s methodological conceptions concerning the working-out material collected by the above-mentioned methods, a description of migration dynamics, and a biometric analysis of the birds trapped. The degrees of generalization based on such material are presented and a suitable system of symbols is proposed in the course of methodological considerations. The biometric part contains an analysis of the population composition of migrating birds. Population differentiations have been found between successive waves of migrants and between birds flying over the two observation points. The variability of biometric parameters of populations in the consecutive years is also discussed.
