25-Year Study of the Population Development of Central European Songbirds: A General Decline, Most Evident in Long-Distance Migrants |
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Authors: | P Berthold W Fiedler R Schlenker U Querner |
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Institution: | (1) Forschungsstelle für Ornithologie, Max-Planck-Gesellschaft, Vogelwarte Radolfzell, Schloss Moeggingen, D-78315 Radolfzell, Germany, DE |
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