Spatial and seasonal variations of Cyanobacteria and their nitrogen fixation rates in Sanya Bay, South China Sea

	Spatial and seasonal variations of Cyanobacteria and their nitrogen fixation rates in Sanya Bay, South China Sea
	Dong, JD ; Zhang, YY ; Wang, YS ; Zhang, S ; Wang, HK
刊名	SCIENTIA MARINA
	2008
卷号	72 期号:2 页码:239-251
关键词	Trichodesmium phytoplankton nitrogen fixation cyanobacteria Sanya Bay
ISSN号	0214-8358
通讯作者	amy0517@gmail.com
中文摘要	The nitrogen fixation rates of planktonic and intertidal benthic cyanobacteria were investigated in Sanya Bay from 2003 to 2005. Trichodesmium thiebautii was the dominant species of planktonic cyanobacteria during our study. Significant seasonal and spatial variations in Trichodesmium spp. abundance were observed (P < 0.01). The highest Trichodesmium concentrations occurred during intermonsoon periods and in the outer region of Sanya Bay (Outer Bay stations). At fixed station S03 the abundance of T. thiebautii ranged from 1.14 x 10(3) to 2060 x 10(3) trichomes m(-2), with an annual mean of 273 x 10(3) trichomes m(-2). The average nitrogen fixation rate per colony of T thiebautii was 0.27 nmol N h(-1) colony(-1) and it did not show any obvious seasonal variations. Nitrogen fixation by planktonic cyanobacteria was highest in the Outer Bay stations, where the estimated amount of new nitrogen introduced by Trichodesmium contributed 0.03 to 1.63% of the total primary production and up to 11.64% of the new production. Statistical results showed that significant seasonal and spatial variations of nitrogen fixation rates were found among the intertidal communities. The main benthic nitrogen-fixing cyanobacteria were identified as members of the genera Anabaena, Calothrix, Lyngbya, Nostoc and Oscillatoria. The highest nitrogen fixation rate was found in microbial mats and the lowest in reefs and rocky sediments. All the benthic communities studied presented their highest nitrogen fixation activity in summer, with an average nitrogen fixation rate of 33.31 mu mol N h(-1) m(-2), whereas the lowest nitrogen activity was detected in winter, with an average nitrogen fixation rate of 5.66 mu mol N h(-1) m(-2). A Pearson correlation analysis indicated that the nitrogen fixation rate of three types of intertidal communities was significantly positively correlated to seawater temperature (P < 0.05), whereas only the nitrogen fixation rate of the reefs and rock communities was significantly negatively correlated to seawater salinity (P < 0.05).
学科主题	Marine & Freshwater Biology
收录类别	SCI
原文出处	JUN
WOS记录号	WOS:000257732200004
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/5360]
专题	南海海洋研究所_海洋生物
推荐引用方式 GB/T 7714	Dong, JD,Zhang, YY,Wang, YS,et al. Spatial and seasonal variations of Cyanobacteria and their nitrogen fixation rates in Sanya Bay, South China Sea[J]. SCIENTIA MARINA,2008,72(2):239-251.
APA	Dong, JD,Zhang, YY,Wang, YS,Zhang, S,&Wang, HK.(2008).Spatial and seasonal variations of Cyanobacteria and their nitrogen fixation rates in Sanya Bay, South China Sea.SCIENTIA MARINA,72(2),239-251.
MLA	Dong, JD,et al."Spatial and seasonal variations of Cyanobacteria and their nitrogen fixation rates in Sanya Bay, South China Sea".SCIENTIA MARINA 72.2(2008):239-251.