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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences >
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Diel vertical migration, population structure and life cycle of the copepod Scolecithricella minor (Calanoida: Scolecitrichidae) in Toyama Bay, southern Japan Sea
| Title: | Diel vertical migration, population structure and life cycle of the copepod Scolecithricella minor (Calanoida: Scolecitrichidae) in Toyama Bay, southern Japan Sea |
| Authors: | Yamaguchi, Atsushi Browse this author →KAKEN DB | | Ikeda, Tsutomu Browse this author →KAKEN DB | | Hirakawa, Kazumasa Browse this author |
| Keywords: | mesopelagic | | omnivore | | Scolecithricella minor | | life cycle | | Japan Sea |
| Issue Date: | Feb-1999 |
| Publisher: | The Plankton Society of Japan |
| Journal Title: | Plankton biology and ecology |
| Volume: | 46 |
| Issue: | 1 |
| Start Page: | 54 |
| End Page: | 61 |
| Abstract: | The seasonal population structure (copepodite-2 stage through adults) and diel vertical migration pattern of Scolecithricella minor in Toyama Bay, southern Japan Sea, were investigated. Eggs and nauplii were reared in the laboratory at three different temperatures (0.5, 5 and 10°C) as a basis to estimate generation length. Most copepodite stages occurred throughout the year; young copepodites (C2 to C5) were most abundant in May-October, while adults were most abundant in March-August. Reproduction continued throughout the year, with a peak in April-August. All copepodite stages were consistently distributed at 100-400 m depth. Limited nocturnal ascent was seen in adults, but not always for younger copepodites. Based on habitat temperature, development times of eggs and nauplii expressed as a function of temperature, and assumed proportion of these developmental times in one life cycle of calanoid copepods, the generation length of S. minor was estimated to be 44-76d. Using this estimated generation length range as a guide, the sequential development of five cohorts was identified. An additional two extra cohorts, which were not clearly traceable, are considered to have occurred for a total of 7 cohorts per year for S. minor in Toyama Bay. The present data on the vertical distribution of S. minor are compared with those reported from other regions for the same species. Since S. minor is considered to be a typical detritus feeder, trophic-type-related sequences in major reproduction seasons are discussed by comparing the data of other calanoid copepods reported from Toyama Bay. |
| Rights: | © 1999 The Plankton Society of Japan |
| Relation: | http://www.plankton.jp/PBE/index.html |
| Type: | article |
| URI: | http://hdl.handle.net/2115/45763 |
| 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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