Abundance estimate of finless porpoises off the Pacific coast of eastern Japan based on aerial surveys
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- Amano Masao
- Otsuchi Marine Research Center, Ocean Research Institute, The University of Tokyo
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- Nakahara Fumio
- College of Community Development, Tokiwa University
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- Hayano Azusa
- Department of Zoology, Graduate School of Science, Kyoto University
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- Shirakihara Kunio
- Ocean Research Institute, The University of Tokyo
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We carried out an aerial survey to estimate the abundance of finless porpoises Neophocaena phocaenoides off the Pacific coast of eastern Japan between Sendai Bay (38°23'N) and the mouth of Tokyo Bay (35°13'N) in May and July 2000. In this region, almost nothing is known about the status of this species. Thirty-seven east-west transects (707.0 km in total) were flown at intervals of 11.1 km. A total of 59 animals (37 primary sightings) was observed along the transects. Although the finless porpoises in this area have been assumed to constitute a single population, two distributional gaps at around 35°N and 37°N suggest the possibility of population subdivision. Finless porpoise sightings were not restricted by distance from the coast, but by water depth (<40 m). The density and abundance of finless porpoises in the area from Sendai Bay to the east coast of Boso Peninsula were tentatively estimated at 0.502 animals/km2 and 3,387 animals (CV = 32.7%), respectively. This density was lower than in other areas around Japan.<br>
収録刊行物
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- Mammal Study
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Mammal Study 28 (2), 103-110, 2003
日本哺乳類学会
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詳細情報 詳細情報について
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- CRID
- 1390282679647370752
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- NII論文ID
- 10011944010
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- NII書誌ID
- AA11185060
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- ISSN
- 13486160
- 13434152
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- NDL書誌ID
- 6808527
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- 使用不可