Skip Navigation



JPR Advance Access published online on December 4, 2007
Journal of Plankton Research, doi:10.1093/plankt/fbm101
This Article
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
30/3/241    most recent
fbm101v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Hirose, M.
Right arrow Articles by Nakano, S.-I.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Hirose, M.
Right arrow Articles by Nakano, S.-I.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Growth and grazing mortality rates of Prochlorococcus, Synechococcus and eukaryotic picophytoplankton in a bay of the Uwa Sea, Japan

Miho Hirose1,2, Toshiya Katano3,4 and Shin-Ichi Nakano1,*

1 Lafwedy, Ehime University, Tarumi 3-5-7, Matsuyama 90-8566, Ehime, Japan 2 Present Address: Nippon Becton Dickinson Company, Ltd, Akasaka Ds Building, 5-26, Akasaka 8-Chome, Minatoku, Tokyo, 107, Japan 3 Center For Marine Environmental Studies, Ehime University, Bunkyo-Cho 3, Matsuyama 790-8577, Japan 4 Department Of Life Science, Hanyang University, Seoul, 133-791, South Korea

* Corresponding Author: shin{at}agr.ehime-u.ac.jp

Received on June 4, 2007; revised on November 5, 2007; accepted on November 29, 2007


  Abstract

Growth and grazing mortality rates of Synechococcus, Prochlorococcus and eukaryotic picophytoplankton were determined in dilution experiments in a bay of the Uwa Sea, Japan. Seasonal changes in the vertical distribution of each picophytoplankter were interpreted based on previous physico-chemical measurements and potential ecophysiological differences. Significant relationships between dilution and picophytoplankton growth rates were found only during the stratified period, suggesting that food linkage between the picophytoplankton and grazers was active during the stratified period. We found an almost 1:1 balance between growth and grazing mortality rates of Prochlorococcus and Synechococcus in the presence of both nanoflagellates and ciliates, suggesting that the abundances of the cyanobacteria are in a quasisteady-state system with grazing losses compensated by growth. The relationship between growth and grazing mortality rates of eukaryotic picophytoplankton were unclear. We discuss the dynamics of each picophytoplankter abundance with special reference to the characteristics of the microbial food web in the bay, together with two physical events responsible for matter cycling within the bay.

Communicating Editor: K. J. Flynn


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.