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Changes in gull numbers over 25 years and notes on other birds of the Otaki-Ohau Coast

  • Publication Type

    Journal Article

  • Publication Year

    1987

  • Author(s)

    R.G. Powlesland, H.A. Robertson

  • Journal Name

    Notornis

  • Volume, Issue

    34, 4

  • Pagination

    327-338

  • Article Type

    Paper

Keywords

Black-backed gull; Larus dominicanus; red-billed gull; Larus novaehollandiae; Otaki; Ohau


Changes in gull numbers over 25 years and notes on other birds of the Otaki-Ohau Coast

Notornis, 34 (4), 327-338

R.G. Powlesland, H.A. Robertson (1987)

Article Type: Paper

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The number of Black-backed Gulls (Larus dominicanus) between the Otaki and Ohau Rivers, on the southwest coast of the North Island, has more than doubled in the last 25 years. There was a significantly larger proportion of subadults in 1961 than now, indicating that the population may have been in a growth phase in the early 1960s. The number of Red-billed Gulls (L. novaehollandiae) was about one-third of the 1961 level; this coincides with a sharp fall in the number of Red-billed Gulls nesting on nearby Kapiti Island. Numbers of other coastal birds were recorded and are discussed.