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Title
  • en Diel and ontogenetic variations in vertical distributions of large grazing copepods during the spring phytoplankton bloom in the Oyashio region
Creator
    • en Onishi, Yuka
    • en Kawai, Momoka
    • en Omata, Aya
    • en Kaneda, Mariko
Accessrights open access
Subject
  • Other en Copepods
  • Other en Diel vertical migration
  • Other en Flux
  • Other en Ontogenetic vertical distribution
  • NDC 452
Description
  • Abstract en Short-term changes in vertical distributions of copepods during the spring phytoplankton bloom were analyzed based on day and night vertically stratified sampling (9 strata between 0-1000 m) with a fine-mesh (60 μm) VMPS in the Oyashio region on five occasions: 8 March, 5, 11, 23 and 29 April 2007. Responses to the bloom were varied and species-specific. Eucatanus bungii C3-C6 were resting around 400 m on 8 March. They had aroused from rest by 5 April, more completely for C6F than for C3-C4. On 29 April, newly recruited C1-C4 stayed in near surface layers (0-50 m). Both Metridia pacifica and Metridia okhotensis showed strong diel vertical migrations (DVM). When the amount of sinking flux was sufficient (23 and 29 April), juveniles ceased DVM and stayed close to 300 m throughout the day and night, while the C6F continued DVM. Continuous DVM behavior of Metridia spp. C6F is likely related to spawning in the surface layer at night. The growth phase of juvenile Neocalanus spp. occurred shallower than 250 m. Within this depth range, vertical partitioning was observed among the species: Neocalanus flemingeri and Neocalanus plumchrus occurred above 50 m, while Neocalanus cristatus was distributed from 75-250 m. The boundary between two patterns was around 50-75 m. These findings are comparable to those in the eastern subarctic Pacific.
Publisher en Elsevier
Date
    Issued2010-09
Language
  • eng
Resource Type journal article
Version Type AM
Identifier HDL http://hdl.handle.net/2115/43807
Relation
  • isVersionOf DOI https://doi.org/10.1016/j.dsr2.2010.03.013
Journal
    • PISSN 0967-0645
      • en Deep Sea Research Part II: Topical Studies in Oceanography
      • Volume Number57 Issue Number17-18 Page Start1691 Page End1702
File
Oaidate 2023-07-26