La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Golden and white-tailed eagles in Scotland and Norway: Coexistence, competition and environmental degradation
Auteurs :	D. J. Halley, Auteur
Type de document :	Article
Dans :	British Birds (91(5) May, 1998)
Article en page(s) :	171-179
Résumé :	In the eighteenth and nineteenth centuries, both the White-tailed Eagle Haliaeetus albicilla and the Golden Eagle Aquila chrysaetos lived in Scotland, but their ranges there were segregated, the latter's distribution seemingly restricted by competition from the White-tailed; Golden Eagles colonised the Scottish range of White-tailed Eagle following that species' extermination in the early twentieth century. In Norway, the breeding ranges of the two species have apparently always overlapped in coastal areas. The diets of Golden Eagles and re-established White-tailed Eagles in Scotland appear to be very similar, largely through the reliance of both species on sheep and deer carrion, whereas, in Norway, these two eagles rely far less on carrion and differ greatly in their diets. Although Golden Eagles are wholly dominant in direct competition, White-tailed Eagles are nevertheless able to outcompete them through having a wider spectrum of available prey. Increased competition and resulting competitive exclusion in western Scotland appear to be a consequence of long-term environmental degradation of the region through deforestation and overgrazing.

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