LIN Shiquan, HUANG Lingfeng, LU Jiachang. Weak coupling between heterotrophic nanoflagellates and bacteria in the Yellow Sea Cold Water Mass area[J]. Acta Oceanologica Sinica, 2014, 33(9): 125-132. doi: 10.1007/s13131-014-0523-5
Citation: LIN Shiquan, HUANG Lingfeng, LU Jiachang. Weak coupling between heterotrophic nanoflagellates and bacteria in the Yellow Sea Cold Water Mass area[J]. Acta Oceanologica Sinica, 2014, 33(9): 125-132. doi: 10.1007/s13131-014-0523-5

Weak coupling between heterotrophic nanoflagellates and bacteria in the Yellow Sea Cold Water Mass area

doi: 10.1007/s13131-014-0523-5
  • Received Date: 2013-02-07
  • Rev Recd Date: 2013-09-13
  • A study was carried out to investigate the grazing pressure of heterotrophic nanoflagellates (HNF) on bacteria assemblages in the Yellow Sea Cold Water Mass (YSCWM) area in October, 2006. The results show that the HNF abundance ranges from 303 to 1 388 mL-1, with a mean of 884 mL-1. The HNF biomass is equivalent to 10.6%-115.6% of that of the bacteria. The maximum abundance of the HNF generally occurred in the upper 30 m water layer, with a vertical distribution pattern of surface layer abundance greater than middle layer abundance, then bottom layer abundance. The hydrological data show that the YSCWM is located in the northeastern part of the study area, typically 40 m beneath the surface. A weak correlation is found between the abundances of HNF and bacteria in both the YSCWM and its above water layer. One-way ANOVA analysis reveals that the abundance of HNF and bacteria differs between inside the YSCWM and in the above water mass. The ingestion rates of the HNF on bacteria was 8.02±3.43 h-1 in average. The grazing rate only represented 22.75%±6.91% of bacterial biomass or 6.55%+4.24% of bacterial production, implying that the HNF grazing was not the major factor contributing to the bacterial loss in the YSCWM areas.
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