| Titre : | Nocturnal mass landing of migrating Cranes in Hesse and Northrine-Westphalia, Germany, in November 1998 |
| Auteurs : | Martin Kraft, Auteur |
| Type de document : | Article |
| Dans : | Vogelwelt (Die) (120(5-6) 1999) |
| Article en page(s) : | 349-351 |
| Résumé : | Crane migration has been surveyed systematically in the Marburg area, Hesse, since 1987, providing a comprehensive overview about timing, numerical trends and year-to year-changes in migration phenology (see Kraft 1999, this issue). An unusual mass landing of nocturnally migrating Cranes was observed in the night of 7-8 November 1998. On 7 Nov. Cranes initiated mass migration in NE Germany due to favourable weather (easterly winds), but in the evening they encountered headwinds and dense fog in parts of southern Lower Saxony, Hesse, Northrine-Westphalia and Reinland-Pfalz. Thousands of Cranes attempted to land near artificial lights, many of them in the middle of towns and villages. At least 22 birds died and 16 were injured from collisions. Overall, however, losses were probably negligible, because in the autumn of 1998 a record number of 107,000 Cranes was estimated to have migrated across Central Germny. Media coverage conveyed the mass landing as a mysterious phenomenon, perhaps due to interference with technical devices or disturbance of the earth's magnetic field. However, the sudden change of favourable to unfavourable migration weather is entirely sufficient to explain the observations. In situations of disorientation, such as in dense fog at night, it is quite normal for migratory birds to be attracted to artificial light sources. Such events are not unusual, although they rarely involve so many cranes. |
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