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Conservation problems and research needs for Bristle-thighed Curlews Numenius tahitiensis on their wintering grounds

Published online by Cambridge University Press:  11 May 2010

Jeffrey S. Marks
Affiliation:
Division of Biological Sciences, University of Montana, Missoula, MT 59812, U.S.A. Present address: U.S. Fish and Wildlife Service, P.O. Box 50167, Honolulu, HI 96850, U.S.A.
Roland L. Redmond
Affiliation:
Cooperative Wildlife Research Unit, University of Montana, Missoula, MT 59812, U.S.A.
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Summary

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The Bristle-thighed Curlew Numenius tahitiensis is a rare shorebird that breeds in western Alaska and winters on oceanic islands in the tropical and subtropical Pacific Ocean. Before human colonization, the islands on which curlews winter were devoid of terrestrial predators, allowing curlews to evolve a rapid moult during which about 50% of adults become flightless. Especially when flightless, these birds are vulnerable to harvest by humans and to predation by introduced mammals such as dogs and cats. On atolls where they are harvested by humans, curlews tend to occur only on uninhabited islets. Consequently, human encroachment in Oceania has probably reduced Bristle-thighed Curlew numbers and altered winter distribution of the species. Future studies should (1) identify concentrations of wintering curlews, focusing in the Tuamotu Archipelago; (2) determine whether migratory stopover sites exist in the central Pacific between Hawaii and the southern end of the wintering grounds; and (3) establish a monitoring programme to assess population trends in several parts of the winter range. A comprehensive plan is needed to provide for the existence of predator-free islands throughout key portions of the winter range.

Type
Research Article
Copyright
Copyright © Birdlife International 1994

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