Seasonal variations of Aulacoseira granulata population abundance in the Pearl River Estuary
文献类型: 外文期刊
作者: Wang, Chao 1 ; Li, Xinhui 1 ; Lai, Zini 1 ; Tan, Xichang 1 ; Pang, Shixun 1 ; Yang, Wanling 1 ;
作者机构: 1.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Fishery Resources & Environm Protect Dept, Guangzhou 510380, Guangdong, Peoples R China
关键词: seasonal variation;population abundance;aulacoseira granulata;phytoplankton;pearl river estuary
期刊名称:ESTUARINE COASTAL AND SHELF SCIENCE ( 影响因子:2.929; 五年影响因子:3.329 )
ISSN:
年卷期:
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收录情况: SCI
摘要: Seasonal variations of the abundance of Aulacoseira granulata populations were studied in the Pearl River Estuary from August 2007 to May 2009. The average abundance of A granulata reached 134.14 × 10~3 ceils dm~(-3) (10.66 × 10~3 filaments dm~(-3)), contributing 9.1% to the total phytoplankton. Compared with freshwater areas, A granulata abundance in the Pearl River Estuary was one or more orders lower. Among the four variant forms of A granulata, the dominance sequence was A granulata var. granulata > var. angustissima > var. curvata > var. angustissima f. spiralis. The dominance of A granulata var. granulata and A.g. var. angustissima benefited from their linear shape. A granulata abundance was higher in the warm seasons and lower in the cold seasons. The fluctuations of Si concentrations could also influence contrasting results as in May 2008 and May 2009. The spatial distribution of A. granulata was mainly influenced by the water runoff of the Pearl River at different outflow channel. We found that the relative abundance of var. angustissima to A granulata var. granulata was much higher in winter than in other seasons, which maybe because high cell surface/volume area (A/V) benefited var. angustissima by ensuring more effective uptake of nutrients and CO_2 and a slower sinking velocity than var. granulata.
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