| Titre : | The Ortolan Bunting Emberiza hortulana in the Wendland region (Lower Saxony) - population increase due to drainage and transformation of grassland into arable land |
| Auteurs : | Markus Deutsch, Auteur |
| Type de document : | Article |
| Dans : | Vogelwelt (Die) (128(3) 2007) |
| Article en page(s) : | 105-115 |
| Résumé : | With up to 1,000 singing males the Wendland region (district of Luchow-Dannenberg, Lower Saxony, northern Germany) represents the western-most stronghold of the Ortolan Bunting Emberiza hortulana in Germany. It is probably the only major population in Germany where an increase has been detected within the last 15 years. This increase was mainly attributed to a higher survey efficiency. However, the increase in one particular area investigated in detail is connected with a major change of land use within approximately 15 years: the portion of grassland decreased from 56% to 19% while the share of arable land increased from 43% to 80%. This change took place in large parts of the district. The spatial distribution of Ortolan Bunting territories was related to the ground water level associated with change of land use. This suggests that a decreasing water level had beneficial effects on Ortolan Bunting density. Possible risks for the recent population in this particular area are discussed. Besides the general intensification on agricultural/arable areas, the highest immediate risk will probably be caused by a loss of crop diversity due to focussing on profitable crops (e.g. less winter rye, more triticale etc.). The cropping area of renewable recourses like maize, oil seed rape or greenrye is increasing in the Wendland region and is not fitting the habitat demands of Ortolan Buntings. Therefore a future decrease of the population can be expected. |
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