La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Differences in flight initiation distances in two Carrion/Hooded crow populations. (2007)
Auteurs :	Christoph Randler, Auteur
Type de document :	Article
Dans :	Vogelwarte (45(2) MAY 2007)
Article en page(s) :	103-107
Langues:	Allemand
Résumé :	Animals usually flee from an approaching human because humans are perceived as potential predators and animals respond accordingly. The distance at which this reaction occurs is termed 'flight initiation distance? (FID). Variation in FID represents variation in an individual's predation hazard assessment and is an excellent metric to quantify an individual's fearfulness. In this study, I assessed the differences between two populations of Crows (Corvus corone) Carrion/Hooded Crows and controlled statistically for the influence of different environmental and social variables on FID. FID decreased when more persons were around and increased with increasing distance to cover, and with an increasing distance to the nearest urbanisation. Crows in eastern Germany around the city of Leipzig took flight at 86.8 +/- 4.2 m and around Stuttgart at 67.2 +/- 3.8 m (estimated marginal means from a GLM). These differences on the population level are discussed.

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