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Diel and ontogenetic variations in vertical distributions of large grazing copepods during the spring phytoplankton bloom in the Oyashio region

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Title: Diel and ontogenetic variations in vertical distributions of large grazing copepods during the spring phytoplankton bloom in the Oyashio region
Authors: Yamaguchi, Atsushi Browse this author →KAKEN DB
Onishi, Yuka Browse this author
Kawai, Momoka Browse this author
Omata, Aya Browse this author
Kaneda, Mariko Browse this author
Ikeda, Tsutomu Browse this author →KAKEN DB
Keywords: Copepods
Diel vertical migration
Flux
Ontogenetic vertical distribution
Issue Date: Sep-2010
Publisher: Elsevier
Journal Title: Deep Sea Research Part II: Topical Studies in Oceanography
Volume: 57
Issue: 17-18
Start Page: 1691
End Page: 1702
Publisher DOI: 10.1016/j.dsr2.2010.03.013
Abstract: 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.
Type: article (author version)
URI: http://hdl.handle.net/2115/43807
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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