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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; amy0517@gmail.com
2008
发表期刊SCIENTIA MARINA
ISSN0214-8358
卷号72期号:2页码:239-251
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).
部门归属[Dong, Junde; Zhang, Yanying; Wang, Youshao; Zhang, Si; Wang, Hankui] Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Dong, Junde; Zhang, Yanying; Zhang, Si; Wang, Hankui] Natl Expt Stn Trop Marine Biol, Sanya, Hainan Island, Peoples R China; [Zhang, Yanying] Chinese Acad Sci, Grad Sch, Beijing, Peoples R China
关键词Trichodesmium Phytoplankton Nitrogen Fixation Cyanobacteria Sanya Bay
学科领域Marine & Freshwater Biology
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收录类别sci
资助项目三亚站
WOS记录号WOS:000257732200004
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/5360
专题海洋生物
通讯作者amy0517@gmail.com
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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,&amy0517@gmail.com.(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.
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