Population Trends Indicated by Birds Ringed in Sweden

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Abstract
In the years 1960-1979 more than 2.5 million birds were ringed in Sweden. For 34 selected passerine species the annual ringing totals were analyzed. The ringing numbers indicated long-term trends of increase or decrease in about 1/4 of the species treated. Species with a clearly increasing trend are Acrocephalus scirpaceus, Hippolais icterina and Carpodacus erythrinus. A decreasing trend was obvious in Delichon urbica, Phoenicurus phoenicurus, Muscicapa striata, Carduelis cannabina and Anthus pratensis.

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