| Titre : | Water bird communities in the Perach river reservoir 20 years after colonization |
| Auteurs : | Hans Utschick, Auteur |
| Type de document : | Article |
| Dans : | Ornithologischer Anzeiger (37(3) Oct., 1998) |
| Article en page(s) : | 221-226 |
| Résumé : | Within the waterfowl community of the Perach river reservoir, population decline and shifts from herbivores and invertebrate feeders to omnivores beginning in 1980 continued due to reservoir maturing effects (see UTSCHICK 1996). Since 1987, only Mallard, Gadwall and Goldeneye increased, now concentrating to the midwinter period. Reflooded old-river-loops lost their importance for the community caused by accelerated tree growth following higher groundwater levels. |



