| Titre : | Disturbance effects of high-speed ferries on wintering sea ducks |
| Auteurs : | J. K. Larsen, Auteur ; B. Laubek, Auteur |
| Type de document : | Article |
| Dans : | Wildfowl (55 2005) |
| Article en page(s) : | 99-116 |
| Langues: | Anglais |
| Résumé : | Human offshore activities are increasingly threatening waterbird conservation interests. The impacts of disturbance by high-speed ferries on Common Eiders Somateria mollissima and Common Scoters Melanitta nigra were studied at a wintering site in the Kattegat Sea, Denmark. Spatial patterns of winter site use, close-range distribution patterns relative to ferry passages and escape distances were examined using aerial surveys and ferry-based observations. For Common Eiders, there was a suggestion of major disturbance impacts, i.e. birds displacing in response to the passage of ferries, within 500-1,000 m of the ferry route: a considerable proportion of flocks (> 10%) located within 400 m took flight in response to a passing ferry, and distributional impacts, including birds responding by swimming, were occasionally suggested within a distance of 500-1,000 m. Although distributional impacts could not be demonstrated with statistical significance within the Hjelm area (partly because of an apparently Limited food supply in the area around the ferry route), it is concluded that highspeed ferry disturbance, had the potential to reduce significantly habitat use within 500 m of the ferry route. Common Scoters tended to take flight further from the ferry route than Common Eiders, however, data were Limited and no conclusions could be made on displacement distances or possible impacts on habitat use. The results show that high-speed ferries may be an important source of disturbance that should be given due attention when the cumulative effects of offshore activities on site use by sea ducks are considered. |
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