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JPR Advance Access originally published online on November 25, 2008
Journal of Plankton Research 2009 31(2):179-191; doi:10.1093/plankt/fbn108
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Phytoplankton composition in the subarctic North Pacific during autumn 2005

Tetsuichi Fujiki*, Kazuhiko Matsumoto, Makio C. Honda, Hajime Kawakami and Shuichi Watanabe

Mutsu Institute for Oceanography, Japan Agency for Marine-Earth Science and Technology, 690 Kitasekine, Sekine, Mutsu, Aomori 035-0022, Japan

* CORRESPONDING AUTHOR: tfujiki{at}jamstec.go.jp

Received on June 30, 2008; accepted on October 24, 2008


  Abstract

During a subarctic North Pacific cruise in autumn 2005, we investigated the similarities and differences between phytoplankton composition in the Alaskan Gyre (AG) and the Western Subarctic Gyre (WSG) using the chemotaxonomy program CHEMTAX, microscopy and flow cytometry. Chlorophyll a (Chl a) standing stock was almost constant (21.5–31.4 mg m–2) throughout the two gyres. Prymnesiophytes were consistently the dominant group (21–50% of Chl a standing stock) in both gyres. Diatoms were a minor component of Chl a standing stock (<10%); however, abundances of large diatoms (Thalassiosira spp., Fragilariopsis spp. and Neodenticula seminae) were higher in the AG than in the WSG. In the AG, green algae (chlorophytes and prasinophytes) were secondary components of Chl a standing stock (16–35%). Pterosperma spp. (Prasinophyceae) partially contributed to the predominance of green algae in the AG. In the WSG, Synechococcus spp. accounted for 14–27% of Chl a standing stock; however, the abundance of Synechococcus spp. reached 11 x 1010 cells m–3 and was numerically much higher than that of eukaryotic plankton (<2 x 1010 cells m–3). The similarities and differences between phytoplankton composition in the AG and WSG will influence the biogeochemical processes and food web dynamics in the subarctic North Pacific.

Corresponding editor: William Li


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