A Conveniept Method for Estimating the Breeding Density of a Threatened Passerine Bird Apalopteron familiare, Endemic to the Ogasawara (Bonin) Islands, Japan.

DOI 1 Citations
  • Suzuki Tadashi
    Department of Biological Sciences, Graduate School of Science, Tokyo Metropolitan University
  • Kawakami Kazuto
    Laboratory of Wildlife Biology, School of Agriculture and Life Sciences, The University of Tokyo Tama Forest Garden, Forestry and Forest Products Research Institute
  • Higuchi Hiroyoshi
    Laboratory of Wildlife Biology, School of Agriculture and Life Sciences, The University of Tokyo

Bibliographic Information

Other Title
  • 小笠原固有絶滅危惧種メグロ <i>Apalopteron familiare</i> の繁殖密度推定のための簡便法

Abstract

We investigated a convenient method for estimating the absolute density of breeding populations of a threatened subtropical passerine, Apalopteron familiare, which is endemic to the Ogasawara (Bonin) Islands. In order to estimate the number of breeding males or pairs, the method takes advantage of the brief dawn chorus period of the species. The number of vocalising males detected, using the method, was very stable during each census period. The detectability of resident males was nearly 90% of the total number of resident males known to be occupying the study area, based on territory mapping of marked birds. Only about 10% of resident, paired males did not sing, thus the method registered almost all males singing in the study site. As few unpaired, singing males were present, the number of males estimated by the method was approximately the same as that of paired males.

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Details 詳細情報について

  • CRID
    1390001205038124672
  • NII Article ID
    130003572877
  • DOI
    10.3312/jyio1952.31.80
  • ISSN
    18833659
    00440183
  • Text Lang
    en
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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