Spatial and seasonal variations of Cyanobacteria and their nitrogen fixation rates in Sanya Bay, South China Sea
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...
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| Format: | Article |
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Consejo Superior de Investigaciones Científicas
2008-06-01
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| Series: | Scientia Marina |
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| Online Access: | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/821 |
| _version_ | 1818827717680824320 |
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| author | Junde Dong Yanying Zhang Youshao Wang Si Zhang Hankui Wang |
| author_facet | Junde Dong Yanying Zhang Youshao Wang Si Zhang Hankui Wang |
| author_sort | Junde Dong |
| collection | DOAJ |
| description | 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 1.14×103 to 2060×103 trichomes m–2, with an annual mean of 273×103 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 µmol N h-1 m-2, whereas the lowest nitrogen activity was detected in winter, with an average nitrogen fixation rate of 5.66 µmol 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). |
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| id | doaj.art-6322e1cebaad46659964732069b71a1e |
| institution | Directory Open Access Journal |
| issn | 0214-8358 1886-8134 |
| language | English |
| last_indexed | 2024-12-19T00:48:00Z |
| publishDate | 2008-06-01 |
| publisher | Consejo Superior de Investigaciones Científicas |
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| series | Scientia Marina |
| spelling | doaj.art-6322e1cebaad46659964732069b71a1e2022-12-21T20:44:12ZengConsejo Superior de Investigaciones CientíficasScientia Marina0214-83581886-81342008-06-0172223925110.3989/scimar.2008.72n2239813Spatial and seasonal variations of Cyanobacteria and their nitrogen fixation rates in Sanya Bay, South China SeaJunde Dong0Yanying Zhang1Youshao Wang2Si Zhang3Hankui Wang4South China Sea Institute of Oceanology, Chinese Academy of SciencesSouth China Sea Institute of Oceanology, Chinese Academy of SciencesSouth China Sea Institute of Oceanology, Chinese Academy of SciencesSouth China Sea Institute of Oceanology, Chinese Academy of SciencesSouth China Sea Institute of Oceanology, Chinese Academy of SciencesThe 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 1.14×103 to 2060×103 trichomes m–2, with an annual mean of 273×103 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 µmol N h-1 m-2, whereas the lowest nitrogen activity was detected in winter, with an average nitrogen fixation rate of 5.66 µmol 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).http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/821trichodesmiumphytoplanktonnitrogen fixationcyanobacteriasanya bay |
| spellingShingle | Junde Dong Yanying Zhang Youshao Wang Si Zhang Hankui Wang Spatial and seasonal variations of Cyanobacteria and their nitrogen fixation rates in Sanya Bay, South China Sea Scientia Marina trichodesmium phytoplankton nitrogen fixation cyanobacteria sanya bay |
| title | Spatial and seasonal variations of Cyanobacteria and their nitrogen fixation rates in Sanya Bay, South China Sea |
| title_full | Spatial and seasonal variations of Cyanobacteria and their nitrogen fixation rates in Sanya Bay, South China Sea |
| title_fullStr | Spatial and seasonal variations of Cyanobacteria and their nitrogen fixation rates in Sanya Bay, South China Sea |
| title_full_unstemmed | Spatial and seasonal variations of Cyanobacteria and their nitrogen fixation rates in Sanya Bay, South China Sea |
| title_short | Spatial and seasonal variations of Cyanobacteria and their nitrogen fixation rates in Sanya Bay, South China Sea |
| title_sort | spatial and seasonal variations of cyanobacteria and their nitrogen fixation rates in sanya bay south china sea |
| topic | trichodesmium phytoplankton nitrogen fixation cyanobacteria sanya bay |
| url | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/821 |
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