| LIN Shiquan,HUANG Lingfeng,LU Jiachang. 2014. Weak coupling between heterotrophic nanoflagellates and bacteria in the Yellow Sea Cold Water Mass area. Acta Oceanologica Sinica, 33(9):125－132 |
| Weak coupling between heterotrophic nanoflagellates and bacteria in the Yellow Sea Cold Water Mass area |
| 黄海冷水团海域微型异养鞭毛虫与细菌的弱耦合关系 |
| Received:February 07, 2013 Revised:September 13, 2013 |
| DOI：10.1007/s13131-014-0523-5 |
| Key words:Yellow Sea Cold Water Mass heterotrophic nanoflagellates bacteria trophic coupling temperature |
| 中文关键词: 黄海冷水团 异养鞭毛虫 细菌 营养耦合关系 温度 |
| 基金项目:The National Basic Research Program (973 Program) of China under contract Nos 2006CB400604 and 2011CB409804; the National Natural Science Foundation of China under contract No. 40876078. |
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| Abstract: |
| 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. |
| 中文摘要: |
| 2006年10月在黄海冷水团海域开展了微型异养鞭毛虫对细菌的摄食压力的调查研究。结果显示，调查海区微型异养鞭毛虫丰度为303~1388 mL-1，平均884 mL-1，其生物量相当于细菌生物量的10.6%~115.6%。微型异养鞭毛虫丰度的极大值出现在30 m以浅水层，其垂直分布规律为表层大于中层大于底层。水文资料表明，黄海冷水团分布在研究区域的东北部，通常在海表以下40m水深至海底。在黄海冷水团内部和冷水团以上的水层中，微型异养鞭毛虫和细菌的丰度的相关关系都不强。单因素方差分析结果也显示，微型异养鞭毛虫和细菌的丰度在黄海冷水团内部与其上水体也有显著不同。微型异养鞭毛虫对细菌的摄食率平均为8.02±3.43 h-1。微型异养鞭毛虫对细菌的摄食压力相当于细菌现存量的22.75±6.91%，或者相当于细菌生产力的6.55±4.24%。以上结果表明，在黄海冷水团海域微型异养鞭毛虫的摄食可能不是导致细菌损失的主要因素。 |
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