| Titre : | [Riverine forests as refuges for birds during bad weather conditions.] |
| Auteurs : | Hans Utschick, Auteur |
| Type de document : | Article |
| Dans : | Ornithologischer Anzeiger (40(2-3) Oktober, 2001) |
| Article en page(s) : | 137-163 |
| Résumé : | Line transect counts of birds from 1975 to 1997 in the Perach riverine forest (Lower River Inn, Bavaria), an area with many parts managed "close to nature", revealed increasing bird abundance after periods of bad weather or days following rapidly falling temperatures or heavy precipitations. This was verified in all seasons of the year and indicates that riverine forests may be important bird refuges of a region. Similiar effects are known from supported feeding sites of towns and villages in winter. Most intensive refuge effects showed small tits (Longtailed, Marsh, Willow Tit) and Nuthatch. In winter and spring more species used the riverine forest as a bad-weather refuge than in summer or autumn, in spring mainly after days and periods of high precipitation. To define the weather-induced refuge effects typical for species and seasons, "reaction types" are created describing a) basic reactions following low temperatures or high precipitations and b) reactions to weather dynamics (intensity of change). Tests comparing the average values of temperature or precipitation over all days with occurrence of a bird species with the averages of all sampling days partly confirmed significant differences. Direct confirmation of the refuge effects may only be possible by an all-season sampling of bird communities along a regional gradient from riverine habitats to forests, agrotopes, settlements etc. outside the river valley. Using the Nuthatch as an example it is demonstrated that for revealing real refuge effects, eventually related parameters like seasonal population dynamics or population trends must be checked first. The results confirm the central position of riverine landscape protection in national nature conservancy laws and support demands for the further extension and regeneration of these habitats. |
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