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Interannual and latitudinal changes in zooplankton abundance, biomass and size composition along a central North Pacific transect during summer : analyses with an Optical Plankton Counter

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/52334

Title: Interannual and latitudinal changes in zooplankton abundance, biomass and size composition along a central North Pacific transect during summer : analyses with an Optical Plankton Counter
Authors: Fukuda, Jumpei Browse this author
Yamaguchi, Atsushi Browse this author →KAKEN DB
Matsuno, Kohei Browse this author →KAKEN DB
Imai, Ichiro Browse this author →KAKEN DB
Keywords: NBSS
Neocalanus
OPC
Size
Transitional Domain
Issue Date: May-2012
Publisher: Plankton Society of Japan : Japanese Association of Benthology
Journal Title: Plankton & benthos research
Volume: 7
Issue: 2
Start Page: 64
End Page: 74
Abstract: To evaluate zooplankton interannual and latitudinal changes, Optical Plankton Counter analyses were made on preserved net zooplankton samples collected by NORPAC net from 0–150 m at 35°N–51°N stations along 180° in the central North Pacific during early–mid June 1981–2000. The mean numerical abundance of total zooplankton for the 20 years varied latitudinally from 19,200 to 84,300 ind. m^-2 but the differences between the three oceanic domains were not significant. However, highly significant latitudinal changes were observed in the mean zooplankton biomass, which ranged from 1.44 to 13.2 mg dry mass m^-2 with higher values in the Transitional Domain (TR) than in the Subarctic and Subtropical Domains. The high biomass in the TR was caused by the dominance of large-sized zooplankton with equivalent spherical diameters (ESD) of 2–4 mm, regarded to consist mainly of Neocalanus spp. C5. Both the slope and intercept of the Normalized Biomass Size Spectrum also showed significant latitudinal changes with a moderate slope and low intercept in the TR due to the dominance of large zooplankton with 2–4 mm ESD in biomass. In contrast to these large latitudinal changes, only limited interannual variations were observed for zooplankton abundance and biomass in the central North Pacific during the study period.
Rights: © 2012 Plankton Society of Japan
Type: article
URI: http://hdl.handle.net/2115/52334
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: 松野 孝平

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