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Title
  • en Vertical segregation within four grazing copepods in the Oyashio region during early spring
Creator
Accessrights open access
Rights
  • en 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 J. Plankton Res. (2011) 33 (8): 1230-1238 is available online at: http://plankt.oxfordjournals.org/content/33/8/1230
Subject
  • Other en diel vertical migration
  • Other en gut content
  • Other en habitat separation
  • Other en ontogenetic vertical migration
  • Other en Neocalanus
  • NDC 663
Description
  • Abstract en Fine-scale vertical distribution patterns of Neocalanus flemingeri, Neocalanus cristatus, Eucalanus bungii and Metridia pacifica were studied by stratified sampling (9 strata between 0 and 1000 m) with a vertical multiple plankton sampler (VMPS) every 3 h for 24 h during 21-22 March 2005 in the Oyashio region. Most C1-C5 stages of N. flemingeri and N. cristatus occurred in the 30-90 m and 70-200 m strata, respectively, both day and night. Irrespective of day and night, C3-C6 E. bungii were distributed broadly in the 200-430 m stratum (C5 inhabiting the shallowest layer). Thus, these three copepods exhibited vertical partitioning of their habitats in the upper layers. The C1-C6 of M. pacifica were distributed broadly from 140 to 400 m during daytime and migrated up to the 100-180 m layer at night (except for non-migrant C1 and C6 males). The within-species zonation of copepodid stages was less marked, but older stages tended to occupy deeper zones (N. flemingeri, N. cristatus and M. pacifica) or shallower zones (E. bungii). Gut content analyses of N. flemingeri and N. cristatus revealed the predominance of diatoms in both species, but the proportion of broken cells was greater in the deep-dwelling N. cristatus than in the shallow-dwelling N. flemingeri, suggesting the importance of sinking phytoplankton aggregates as food source for the former species.
Publisher en Oxford University Press
Date
    Issued2011-08
Language
  • eng
Resource Type journal article
Version Type AM
Identifier HDL http://hdl.handle.net/2115/48558
Relation
  • isVersionOf DOI https://doi.org/10.1093/plankt/fbr018
Journal
    • PISSN 0142-7873
      • en Journal of Plankton Research
      • Volume Number33 Issue Number8 Page Start1230 Page End1238
File
Oaidate 2023-07-26