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Examining the relationship between bacteria and heterotrophic nanoflagellates in Funka Bay (Japan) using the size-fractionation method
Lee, C.W.; Kudo, I.; Morishita, H.; Yanada, M.; Maita, Y. (2001). Examining the relationship between bacteria and heterotrophic nanoflagellates in Funka Bay (Japan) using the size-fractionation method. Aquat. Ecol. 35(1): 1-8
In: Aquatic Ecology. Springer: Dordrecht; London; Boston. ISSN 1386-2588, more
Peer reviewed article  

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Keywords
    Growth rate; Bacteria [WoRMS]; INW, Japan, Hokkaido, Funka Bay; Marine

Authors  Top 
  • Lee, C.W.
  • Kudo, I.
  • Morishita, H.
  • Yanada, M.
  • Maita, Y.

Abstract
    The chemical and biological conditions, and the bacteria-heterotrophic nanoflagellate (HNF) relationship were investigated in the vicinity of Funka Bay, southwest of Hokkaido, Japan during early spring 1999. At the time of sampling, chlorophyll a concentration, bacteria, phycoerythrin rich-cyanobacteria, and HNF abundance were in the following ranges: 0.3-3.6 mg l^−1, 2.5-5.6 × 10^5 cells ml^−1, 0.6-1.2 × 10^3 cells ml^−1, and 2.2-4.2 × 10^3 cells ml^−1, respectively. Dissolved inorganic nitrogen, phosphate and silicate concentrations were in the ranges: 8.7-12.2 mM, 0.9-2.0 mM, and 21.6-25.5 mM, respectively. Primary production ranged from 6.4 to 76.3 mg C m^−3 d^−1. Using water samples from regions of different productivity levels (in and outside bay), the bacteria - HNF relationship was uncoupled experimentally by the size-fractionation technique. Higher primary production (19.9 mg C m^−3 d^−1) in the bay supported higher bacterial growth rate (0.029 h^−1). However, outside the bay both primary production (6.4 mg C m^−3 d^−1) and bacterial growth rate (0.007 h^−1) were lower. The HNF growth rates and grazing rates were similar for both but by comparing both HNF grazing capacity and bacterial production, there was net decrease in bacterial abundance outside the bay and net increase inside the bay. The microbial parameters (rates and abundance) and the amount of carbon flow estimated through the phytoplankton - dissolved organic matter (DOM) - bacteria loop were different between the coastal station and the open ocean station. However HNF grazing and growth rates was similar for both stations.

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