| Titre : | Migration and resting of the Common Crane Grus grus and changes in four decades |
| Auteurs : | Hartwig Prange, Auteur |
| Type de document : | Article |
| Dans : | Vogelwelt (Die) (131(2) 2010) |
| Article en page(s) : | 155-168 |
| Résumé : | Methods of monitoring, recording and evaluation of Common Crane migration and stopover on the West-European flyway are described. The present paper gives a survey on latest data and changes during the past four decades. Since the beginning of the 1980s the number of migrating Cranes has increased from about 50,000 to 240,000 at present. This is partly due to a yearly increase by 5 to 8% of the populations in northern and Central Europe and possibly also in the central East-European regions. Another reason is the increasing occurrence of East-European cranes due to a shift of the flyway margin to the east. The increase of the populations in Central Europe is associated with a larger density of breeding pairs as well as the expansion of the breeding range to the north, the south and particularly to the west.For about two decades, improved protection, more favourable food conditions, and mild winters have caused a longer resting of the Cranes in autumn. Additionally, more Cranes have wintered more to the north, in particular in France (up to 90,000 cranes) and even in Germany (up to 15,000 cranes). Breeding pairs have advanced their arrival in spring by four weeks. Finally, the intensified maize cultivation and the enlarged roost capacity through rewetting of floodplain meadows and north-western German bogs are of particular significance. Considering climate change as well, the growing crane population is a complex phenomenon, which with strong public perception highlights an example of coexistence of successful protection and intensive agriculture in a highly civilised society. |
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