| Titre : | Successfully releasing jackdaws, Corvus monedula: spatial dispersion and the fusion of social groups. (2011) |
| Auteurs : | Johanna Wagner, Auteur ; Georgine Szipl, Auteur ; Christine Schwab, Auteur |
| Type de document : | Article |
| Dans : | Vogelwarte (49(3) AUG 2011) |
| Article en page(s) : | 163-174 |
| Langues: | Allemand |
| Résumé : | The focus of the present study was a release project on jackdaws (Corvus monedula) which was carried out in two steps in 2007 and 2009. In 2007 we focused on the spatial dispersion of individuals which started gradually but then turned into a stepwise increase. A change in the functional use of space was associated with the birds' spatial dispersion into areas other than those immediately surrounding the aviary in which especially the centre of the birds' activities was relocated. 2009 focused on the analysis of the process how a newly released group of jackdaws and the already existing wild colony of birds would unite into a single social group. In this process both colonies used different strategies: in contrast to the individuals of the wild colony that mainly approached the newly released individuals in an aggressive manner, the latter initiated more sociopositive interactions towards the former. Although after two weeks the two colonies could be considered as one when referring to their spatial cohesiveness, our results show that their social cohesiveness was achieved only after about two months. Furthermore, our study indicates which factors of the context and the biology of jackdaws, respectively, may be especially important for a successful release in these birds: visual acquaintance with the new environment, social dynamics of jackdaw colonies that represent free entry groups in which emigration and immigration are frequent phenomena and can be used for releasing purposes, and the importance of an established dominance hierarchy due to which dominant individuals can take the lead while subdominant conspecifics may follow them. |
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