Phosphorus input by nordic geese to the eutrophic Lake Arendsee, Germany

摘要: Phosphorus import by nordic geese (Anser fabalis and Anser albifrons) was investigated in Lake Arendsee, located the Saxony-Anhalt region, Altmark, Germany during period 1996 to 1997. contained excrement on ice measured winters In February (after 9 days of frozen lake surface) two fields amounted 80 ha 30 area January 1997, 10 after closure, field 106 large. The weight estimated be 148 266 g m -2 fresh (mean 201 ) 83 408 243 average phosphorus content 8.5 mg -1 dry 1997 9.2 1996. Based these values input attributed calculated. Our results demonstrated a surface 251 kg freezing 173 kg. During 100 wintering, Arendsee produced load 2.8 t 1.7 Compared with annual from different sources, contribution 88 % 92 Its yearly winter months appears as significant eutrophication factor for trophic level Arendsee. However, external is approximately poolsize water, even less when considering amount lodged bottom sediments.