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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Territory size and territory use by Common Cranes Grus grus with young in Mecklenburg-Vorpommern: Preliminary results of a radio-tracking study
Auteurs :	Guenter Nowald, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (120(5-6) 1999)
Article en page(s) :	261-274
Résumé :	The requirements of Crane families with young regarding food availability and habitat use are poorly known, although such aspects are of great importance for conservation. This is because Cranes behave particularly inconspicuously when rearing young. Preliminary results of a research project of the working group" Crane Protection Germany (NABU, WWF and Lufthansa Umweltfoerderung)" from one Crane family in two seasons are presented, highlighting radio-tracking methods, territory size and selection of foraging sites in relation to food availability and disturbance. When trying to locate the radio-tagged cranes exactly, the method of "zero-peak-location" proved to be very successful with a location error of only 1degree. In 1995 the territory of the Techentin Crane family comprised 103 ha according to the core convex polygon method (77 ha in 1996). In both years the birds mainly used agricultural fields which had previously been extensively farmed or which had lain fallow. The intensively farmed weed-free mono-cultures "wheat" and "barley", as well as short-grass hay meadows, were used very little by the Crane families in 1995. The activity distribution differed significantly between field types (chi2 = 316,2; p

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