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Vertical segregation within four grazing copepods in the Oyashio region during early spring

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Title: Vertical segregation within four grazing copepods in the Oyashio region during early spring
Authors: Sato, Ken-Ichi Browse this author
Yamaguchi, Atsushi Browse this author →KAKEN DB
Ueno, Hiromichi Browse this author →KAKEN DB
Ikeda, Tsutomu Browse this author →KAKEN DB
Keywords: diel vertical migration
gut content
habitat separation
ontogenetic vertical migration
Issue Date: Aug-2011
Publisher: Oxford University Press
Journal Title: Journal of Plankton Research
Volume: 33
Issue: 8
Start Page: 1230
End Page: 1238
Publisher DOI: 10.1093/plankt/fbr018
Abstract: 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.
Rights: 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:
Type: article (author version)
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)

Submitter: 山口 篤

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