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Title
  • en Short-term changes in population structure and vertical distribution of mesopelagic copepods during the spring phytoplankton bloom in the Oyashio region
Creator
Accessrights open access
Subject
  • Other en Mesopelagic
  • Other en Copepods
  • Other en Population structure
  • Other en Vertical distribution
  • Other en Gut contents
  • NDC 660
Description
  • Abstract en To evaluate the responses to the spring phytoplankton bloom, short-term changes in population structure and vertical distribution of mesopelagic copepods (Gaetanus simplex, Gaidius variabilis, Pleuromamma scutullata, Paraeuchaeta elongata, P. birostrata, Heterorhabdus tanneri and Heterostylites major) were studied in the Oyashio region. Samples were collected with a 60 mu m mesh VMPS from 9 strata between 0 and 1000 m both day and night on five occasions during March-April 2007. All the species except Heterorhabdidae species performed reproduction during the spring phytoplankton bloom, while no recruitment to copepodid stages was detected because the newly born individuals were eggs or nauplii. The shallower-living species, G. simplex, P. scutullata and P. elongata had nocturnal ascent did l vertical migration (DVM). While suspension feeding copepods cease DVM after 11 April (P. scutullata) or 23 April (G. simplex), carnivorous P. elongata continued DVM over the study period. Since the gut contents of G. simplex showed a nocturnal increment even in the period of no DVM (23 and 29 April), they might be feeding at depth without DVM. Thus, the cessation of DVM in mesopelagic suspension feeding copepods would be induced by the increase of sinking particles (e.g. food for suspension feeders) during the spring phytoplankton bloom. (C) 2012 Elsevier Ltd. All rights reserved.
Publisher en ELSEVIER
Date
    Issued2012-07
Language
  • eng
Resource Type journal article
Version Type AM
Identifier HDL http://hdl.handle.net/2115/57994
Relation
  • isVersionOf DOI https://doi.org/10.1016/j.dsr.2012.02.009
Journal
    • PISSN 0967-0637
      • en Deep Sea Research Part I: Oceanographic Research Papers
      • Volume Number65 Page Start100 Page End112
File
Oaidate 2023-07-26