| Titre : | [How efficient are voluntary bird census projects? Experiences with the Yellowhammer Emberiza citrinellus census 1999 in Hesse.] |
| Auteurs : | Josef Kreuziger, Auteur |
| Type de document : | Article |
| Dans : | Vogelwelt (Die) (123(2) 2002) |
| Article en page(s) : | 105-108 |
| Résumé : | Efficiency and problems of voluntary bird census projects are shown using the example of the Yellowhammer census in Hesse 1999. The results should give some hints to plan future census programs more efficiently. |



