January 1983
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250 Reads
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74 Citations
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Citations (1)
... Once again it must be stressed that the variability of daily counts was very high (e.g. on 16 th August not one bird was seen for 3 hours). The migration of waterfowl depends greatly on weather conditions (Alerstam 1979, Camphuysen and Dijk 1983, Meissner 2003), but this was not the reason for the variability of the results, as the weather conditions were quite stable during the entire period of observations. The numbers of flying birds observed were surprisingly low in comparison with the literature data. ...
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January 1983