| Titre : | Spacing and social behaviour of the ptarmigan Lagopus mutus during the Greenland summer |
| Auteurs : | Manfred Lieser, Auteur ; Marek Zakrzewski, Auteur |
| Type de document : | Article |
| Dans : | Vogelwarte (43(2) MAY 2005) |
| Article en page(s) : | 111-121 |
| Langues: | Allemand |
| Résumé : | From 1996-1999, 15 ptarmigan (7 male, 8 female) were radio-tracked between early June and mid-August on Traill Island (northeastern Greenland), providing many data about spacing and social behaviour during the breeding and chick-rearing period. We obtained new information concerning the spatial separations of paired individuals and the relocations of female relative to the nest site, during their daily movements. The birds had different home ranges depending on their reproductive status. Breeding female stayed close to the nest, and later, with their chicks, remained within areas of 30-60 ha. Some female that had lost their clutch to predators left the breeding ground and moved as far away as 3.5 km. In most cases the home ranges of male were considerably larger (68-745 ha); the maximum distance between two relocations of one individual reached 7 km. Cocks having an incubating female occasionally travelled more than 1 km away and were sometimes seen with another female. After hatching, some cocks kept close to the broods and assisted in predator avoidance. The mating system appears to be facultative polygyny, allowing ptarmigan to adapt to annually varying ecological conditions in the high Arctic. From mid-July onwards, the male are no longer territorial, and ptarmigan form small groups of male or bigger groups comprising both sexes and young. These groups may search for new food resources at distances of over 5 km. |
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