La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	The status of Black Oystercatchers Haematopus bachmani on Middleton Island, Alaska, in 2016
Auteurs :	T. van Nus, Auteur
Type de document :	Article
Dans :	Wader Study (124(2) 2017)
Article en page(s) :	120 - 124
Langues:	Anglais
Résumé :	Since the first pair of Black Oystercatchers Haematopus bachmani was recorded breeding on Middleton Island, Alaska, in 1976, the island has become one of the species’ key nesting areas. I conducted a survey of the whole island in July 2016and found a total of 860 individuals, comprising 536 territorial birds (268 pairs) and 324 birds in non-breeding flocks. This is the first count to have exceeded 800 and shows that the island now supports about 8% of the most recent estimate of the global population of the species. The most recent increase can mostly be attributed to more non-breeders, not more breeding pairs. Future work should focus on monitoring the productivity of the breeding population. Conservation concerns include disturbance by people using all-terrain vehicles and depredation of eggs and young by Common Ravens Corvus corax and Glaucous-winged Gulls Larus glaucescens.

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