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伊豆諸島海域における外洋性矢虫類の一種，Pterosagitta draco (Krohn) の分布特性
https://fra.repo.nii.ac.jp/records/2005357
https://fra.repo.nii.ac.jp/records/2005357c456597e-9bf1-4632-bbd1-0702a8a60091
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||||
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| 公開日 | 2024-05-22 | |||||||||||
| タイトル | ||||||||||||
| タイトル | 伊豆諸島海域における外洋性矢虫類の一種，Pterosagitta draco (Krohn) の分布特性 | |||||||||||
| 言語 | ja | |||||||||||
| タイトル | ||||||||||||
| タイトル | Distributional Properties of an Oceanic Chaetognath Pterosagitta draco (KROHN) in the Waters around the Izu Islands, South of Japan | |||||||||||
| 言語 | en | |||||||||||
| 言語 | ||||||||||||
| 言語 | jpn | |||||||||||
| 資源タイプ | ||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||
| 資源タイプ | departmental bulletin paper | |||||||||||
| アクセス権 | ||||||||||||
| アクセス権 | metadata only access | |||||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||||||||
| 著者 |
森, 真朗
× 森, 真朗
× 黒田, 一紀 |
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| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | Pterosagitta draco (KROHN), one of the pelagic Chaetognatha, is known to be an indicator species of the Kuroshio offshore water. This paper presents the distributional properties of this species in the waters around the Izu Islands south of Japan and the reproduction of this species from the studies of the body length and the maturity stages in order to clarify the indicative character to water masses. Plankton samples were collected on board R/V Miyako of the Tokyo Metropolitan Fisheries Experiment Station, by hauling up the 45 cm Marutoku net from 150 cable meters at eighteen stations monthly from April 1981 through March 1982. At the same time, the oceanographical observations were conducted. The results are summarized as follows: 1) A total of 225 individuals of P. draco were collected among all chaetognaths. The mean density of this species for monthly observation was large in June, July, November and December, and small from February to April. The ratio of occurrence of this species to all chaetognaths ranged from 0.3 to 5.9%, being large between November and January. 2) This species was distributed mainly in the offshore area south of 15°C isotherm at 200 m depth. Therefore, the distributional pattern of this species was closely related to the fluctuation of the Kuroshio current axis. 3) The body length of this species without tail fin was in the range between 2.7 to 9.6 mm, being abundant at 6 mm class. The body length on each maturity stage (Thomson, 1947) was as follows; O-stage (juveniles) : 2.7-6.3 mm, I-stage: 4.9-7.7 mm, II-stage: 6.0-8.3 mm, III-stage: 5.9-9.6 mm, IV- stage (spawning group) : 6.2-8.1 mm. 4) A total of 18 individuals of IV-stage (spawning group) were 6.9 mm in the mean body length and 2.9 mm in the mean ovary length. The eggs in the ovary were 31 in the mean numbers, ranging from 21 to 46, and from 0.13 to 0.30 mm in the size diameter. As the egg size of this species just before hatching out is supposed to be 0.3 mm, this species has a few and large-sized egg compared with other chaetognaths. 5) The spawning of this species supposedly occurs from April to December, chiefly from June to August. This species may begin spawning at 5 mm elass, and the fry may hatch out before reaching 3 mm long in the body length. 6) The spawning grounds of this species may be in warm, oceanic waters above 20°C at 50 m depth. 7) The optimum hydrographical conditions of this species were from 20.0 to 27.5°C in water temperature, from 34.30 to 34.85‰ in salinity and from 22.0 to 24.5 gr.cm⁻³ in density in situ at 50 m depth. 8) The optimum hydrographical conditions of this species fluctuated by seasons similar to the notes reported as follows by Kubo and Imai (1981). Season Water temperature Salinity Spring (Apr .- May) 20-22°C 34.75-34.90‰ Summer (July) 22-26°C 34.50-34.85‰ Autumn (Sep .- Oct.) 24-28°C 34.30- 34.75‰ 9) In the waters around the Izu Islands south of Japan, the distributional area of this species may be restricted by low temperature from January to June, and by low salinity from July to October. 10) A species lives in one's own environments adapted through the process of evolution; therefore, a species has a peculiar indicative character, 'indicativility' to environments. Accordingly, the term of biological 'indicativility' means to clarify the relationship between the species and environments in every developmental stage of the life history. The usefulness of a biological indicator species may be allowed by the estimation of indicative characters of the species taking in consideration of regional and seasonal properties. |
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| 言語 | en | |||||||||||
| 書誌情報 |
ja : 東海区水産研究所研究報告 en : Bulletin of Tokai Regional Fisheries Research Laboratory 巻 112, p. 1-11, ページ数 11, 発行日 1983-12-25 |
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| 出版者 | ||||||||||||
| 出版者 | 東海区水産研究所 | |||||||||||
| 言語 | ja | |||||||||||
| 出版者 | ||||||||||||
| 出版者 | Tokai Regional Fisheries Research Laboratory | |||||||||||
| 言語 | en | |||||||||||
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| 収録物識別子タイプ | PISSN | |||||||||||
| 収録物識別子 | 0040-8859 | |||||||||||
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| 収録物識別子タイプ | NCID | |||||||||||
| 収録物識別子 | AN00156834 | |||||||||||
| 情報源 | ||||||||||||
| 識別子タイプ | Local | |||||||||||
| 関連識別子 | tokai_k_112_1 | |||||||||||
| 関連サイト | ||||||||||||
| 識別子タイプ | URI | |||||||||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010291727 | |||||||||||
| 言語 | ja | |||||||||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||||||||
