Preliminary study on bacterivory of heterotrophic nanoflagellate upon heterotrophic bacteria and cyanobacteria in the Huanghai Sea Cold Water Mass area

ZHU Zhi-sheng; LIN Shi-quan; HUANG Ling-feng; GUO Feng

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ZHU Zhi-sheng, LIN Shi-quan, HUANG Ling-feng, GUO Feng. Preliminary study on bacterivory of heterotrophic nanoflagellate upon heterotrophic bacteria and cyanobacteria in the Huanghai Sea Cold Water Mass area[J]. Haiyang Xuebao, 2009, 31(5): 123-131.

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Preliminary study on bacterivory of heterotrophic nanoflagellate upon heterotrophic bacteria and cyanobacteria in the Huanghai Sea Cold Water Mass area

1.
Department of Oceanography Xiamen Universty, Xiamen 361005, China
2.
Department of Oceanography Xiamen Universty, Xiamen 361005, China;State Key Laboratory of Marine Environmental Science(Xiamen University), Xiamen 361005, China

Received Date: 2008-12-05
Rev Recd Date: 2009-08-12

Abstract

Abstract

Predation on bacteria and cyanobacteria (Synechococcus spp.) by heterotrophic nanoflagellate (HNF) were measured at three stations in the Huanghai Sea Cold Water Mass (HSCWM) area in October,2006.It was shown that the densities of HNF,bacteria and cyano bacteria were 0.36×10³~1.13×10³,0.39×10⁶~1.13×10⁶ and 0.04×10⁴~3.74×10⁴ cells/cm³ respectively Ingestion rate of heterotrophic bacteria,estimated on the basis of uptake of fluorescently labeled bacteria,varied from 5.33~14.89 (cell/ HF·h).The grazing rate on cyanobacteria was calculated from 0.26×10^-2 to 23.10×10^-2 cells/(HF·h).HNF removed only 9.27%~33.08% of bacterial biomass and 2.66%~13.1% of bacterial production,while the consumption upon cyanobacteria was 8.12%~16.09% of the biomass and 8.12%~16.09% of the production,indicating that the consumption by HNF was unlikely responsible for the main fate of these two planktonic bacteria and their production in the HSCWM in autumn.
- flagellates,
- bacteria,
- grazing,
- the Huanghai Sea Cold Water Mass

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References(44)

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