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    Distribution and abundance of the Chatham Island Oystercatcher (Haematopus chathamensis)

    Schmechel, Frances A.; O'Connor, Shaun
    Abstract
    From 13 to 18 December 1998, we counted Chatham Island Oystercatchers (Haematopus chathamensis) on approximately 310 km (96 - 97%) of the coastlines of Chatham, Pitt, Rangatira, and Mangere Islands, and 100 km (100%) of the shore of Te Whanga Lagoon, Chatham Island. A total of 142 adult Chatham Island Oystercatchers, including 34 confirmed breeding pairs and seven additional possible breeding pairs, was found. This is an increase of 20 to 40 adults over any previous count or estimate. Some of this increase may be due to efforts by the Department of Conservation to increase productivity of breeding pairs since the early 1990s along the northern coast of Chatham Island. Approximately 70% percent of the breeding pairs were on Chatham Island, 15% on Pitt Island, 10% on Rangatira and 5% on Mangere Island. Most of the oystercatchers (79% of individuals and 74% of the breeding pairs) were in areas we broadly defined as containing rocky wave-cut platform or other rocky coastline or outcrops. Thirty individuals and nine breeding pairs were on sandy beaches. One immature bird was on the shore of Te Whanga Lagoon.... [Show full abstract]
    Keywords
    Chatham Island oystercatcher; Haematopus chathamensis; Chatham Islands; population size; endangered species
    Date
    1999-03
    Type
    Journal Article
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    • Department of Pest Management and Conservation [638]
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    Notornis_46_1_155.pdf
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    Copyright © 1999 Ornithological Society of New Zealand
    Citation
    Schmechel, F. A., & O'Connor, S. (1999). Distribution and abundance of the Chatham Island Oystercatcher (Haematopus chathamensis). Notornis, 46(1), 155-165.
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