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Title
  • ja 日本東方海域における浮遊性ヤムシ類の動物相と分布生態に関するレビュー (ヤムシ研究会ワークショップ論文集)
  • en Review on the fauna and the distributional ecology of pelagic chaetognaths in the eastern seas of Japan (Oyashio, Kuroshio regions and Transition domain)
Creator
    • ja 小鳥, 守之 en KOTORI, MORIYUKI
Accessrights open access
Rights
  • ja © [2012] 日本プランクトン学会
Subject
  • Other en parasagitta elegans
  • Other en Eukrohnia hamata
  • Other en Eukrohnia fowleri
  • Other en life cycle
  • Other en vertical distribution
  • NDC 660
Description
  • Abstract en The fauna and the distributional ecology of pelagic chaetognaths in the eastern seas of Japan (Oyashio，Ku roshio regions and Transitional domain) were reviewed. Chaetognaths composed ca. 10 % of the mesozooplankton biomass，a nd 29 species with 1 form belonging to 14 genera were reported from this region. Species number was lesser in the Oyashio region and neritic Otsuchi Bay (5-9 spec i，)es while it was higher in the Kuroshio region and warm core rings (18-22 species).Seasonal changes of dominant species were reported in the Oyashio region，w hich might be caused by the seasonal fluctuation in intensity of the Oyashio Current. While the chaetognath fauna showed clear geographical changes in the upper 1000 m，fauna below 1000 m was dominated by Eukrohnia fowleri throughout the three regions.The epipelagic species Parasagitta elegans underwent diel vertical migration (DVM) characterized by an octurnal ascent，while meso-and bathypelagic species had no DVM. For Eukrohnia species，vertical segregation within the genus was evident.The life cycle of P. elegans in the Oyashio region was characterized by distinct seasonality in reproduction and growth，w hich might be caused by the large seasonal changes of environmental conditions (i.e. temperature and food organism availability) in the Oyashio region. For future studies，three topics should be addressed: firstly; the functional role of chaetognaths in marine ecosystems，secondary; the life cycle of mesopelagic E. hamata/ bathypelagica，thirdly; application of the Visual Plankton Recorder (VPR) for evaluation of feeding of by chaetognaths.
Publisher ja 日本プランクトン学会
Date
    Issued2012-08
Language
  • jpn
Resource Type journal article
Version Type VoR
Identifier HDL http://hdl.handle.net/2115/57090
Journal
    • PISSN 0387-8961
    • NCID AN00197015
      • ja 日本プランクトン学会報
      • Volume Number59 Issue Number2 Page Start98 Page End101
File
Oaidate 2023-07-26