Nest Structure and Breeding Population Estimation of Streaked Shearwaters <i>Calonectris leucomelas</i> on Nakanokamishima
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- Yamamoto Takashi
- Department of Polar Science, School of Multidisciplinary Sciences, The Graduate University for Advanced Studies
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- Kohno Hiroyoshi
- Okinawa Regional Research Center, Tokai University
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- Mizutani Akira
- Okinawa Regional Research Center, Tokai University
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- Yoda Ken
- Graduate School of Environmental Studies, Nagoya University
Bibliographic Information
- Other Title
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- 仲ノ神島におけるオオミズナギドリの巣穴構造と繁殖個体数推定
- ナカ ノシントウ ニ オケル オオミズナギドリ ノ スアナ コウゾウ ト ハンショク コタイスウ スイテイ
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Abstract
<p>We estimated the breeding population of Streaked Shearwaters Calonectris leucomelas, and investigated their nest burrow structures on Nakanokamishima. Streaked Shearwater nest burrows were found throughout the survey area, and at highest densities in flat or gentle sloping areas. The nest burrow density was 0.64±0.22 nest/m2 for the high nest-density area, 0.19±0.15 nest/m2 for the thicket area, and 0.10±0.10 nest/m2 for the low nest-density area. Brooding nest density was 0.13±0.10 nest/m2 for the high nest-density area, 0.01±0.03 nest/m2 for the thicket area, and 0.01±0.03 nest/m2 for the low nest-density area. We multiplied the 3D area by the nest burrow or brooding nest density in each area type, and the total numbers of nest burrow and brooding nest on Nakanokamishima were estimated to be 18,853 and 2,783 nests, respectively, and breeders as 5,566 birds. Entrances of nest burrows of Streaked Shearwater positioned in slope areas tended to be directed to downward of the slope, and entrances of those in flat places tended to be directed to the nearest coast. We found two types of nest structure: straight or curved (or hooked) types. The length of burrows was 75±22 cm for the straight type and 99±20 cm for the curved type.</p>
Journal
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- Journal of the Yamashina Institute for Ornithology
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Journal of the Yamashina Institute for Ornithology 46 (2), 67-81, 2015
Yamashina Institute for Ornitology
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Details 詳細情報について
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- CRID
- 1390001205222146432
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- NII Article ID
- 130005464622
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- NII Book ID
- AA11864856
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- ISSN
- 18820999
- 13485032
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- NDL BIB ID
- 026287446
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed