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Hokkaido University Collection of Scholarly and Academic Papers >
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Vertical distribution, life cycle and body allometry of two oceanic calanoid copepods (Pleuromamma scutullata and Heterorhabdus tanneri) in the Oyashio region, western North Pacific Ocean
| Title: | Vertical distribution, life cycle and body allometry of two oceanic calanoid copepods (Pleuromamma scutullata and Heterorhabdus tanneri) in the Oyashio region, western North Pacific Ocean |
| Authors: | Yamaguchi, Atsushi Browse this author →KAKEN DB | | Ikeda, Tsutomu Browse this author →KAKEN DB |
| Keywords: | life cycle | | body allometry | | mesopelagic | | copepods |
| Issue Date: | 1-Jan-2000 |
| Publisher: | Oxford University Press |
| Journal Title: | Journal of Plankton Research |
| Volume: | 22 |
| Issue: | 1 |
| Start Page: | 29 |
| End Page: | 46 |
| Publisher DOI: | 10.1093/plankt/22.1.29 |
| Abstract: | Diel and seasonal vertical distribution, life cycle and body allometry of Pleuromamma scutullata and Heterorhabdus tanneri were investigated in the Oyashio region during September 1996 through October 1997. Monthly samples were collected with 0.1 mm-mesh closing nets towed through five discrete depths between the surface and ≤2000 m. Copepodite stages 1 through 6 of P. scutullata and 3 through 6 of H. tanneri were collected effectively with the nets. Day-night samplings during December 1996, April and October 1997 revealed both species ascend at night. Seasonal differences in the vertical distribution patterns of both copepods were insignificant, and P. scutullata was distributed much shallower (250-500 m) than H. tanneri (600-850 m). By tracing the sequential changes in abundance peaks of each copepodite stage, both species are considered to produce one generation per year. The main reproduction season was estimated to occur in spring for P. scutullata and in winter for H. tanneri. The relationships between prosome length and wet weight, dry weight, and ash-free dry weight indicated that the increase in weight per molt was much greater in H. tanneri than in P. scutullata. These dissimilar features are discussed in relation to the dissimilar food habits of these two species and production cycle of food organisms in the Oyashio region. |
| Rights: | This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Journal of Plankton Research following peer review. The definitive publisher-authenticated version Journal of Plankton Research (2000) 22 (1): 29-46 is available online at: http://plankt.oxfordjournals.org/content/22/1/29.full. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/45409 |
| Appears in Collections: | 水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 山口 篤
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