Influence of N/P ratio on the growth and competition of two red tide algae

KANG Yan-yu; LIANG Jun-rong; GAO Ya-hui; LIN Rong-cheng; GAO Hua; XING Xiao-li; MA Jie; LUO Qiao-qi

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Article Navigation > Haiyang Xuebao > 2006 > 28(5): 117-122

KANG Yan-yu, LIANG Jun-rong, GAO Ya-hui, LIN Rong-cheng, GAO Hua, XING Xiao-li, MA Jie, LUO Qiao-qi. Influence of N/P ratio on the growth and competition of two red tide algae[J]. Haiyang Xuebao, 2006, 28(5): 117-122.

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Influence of N/P ratio on the growth and competition of two red tide algae

1.
School of Life Sciences, Xiamen University, Xiamen 361005, China;Xiamen Inspection and Testing Center of Agricultural Product Quantity and Security, Xiamen Agricuture Administration, Xiamen 361009, China
2.
School of Life Sciences, Xiamen University, Xiamen 361005, China
3.
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

Received Date: 2005-06-09
Rev Recd Date: 2006-03-04

Abstract

Abstract

The growth and species competition of two red tide species Thalassiosira pseudonana and Gymnodinium sp.were studied under different N/P ratio, and the algal batch culture experiments was conducted.The physiological and biochemical indexes were measured periodically,including µ_max,K,G(d) and Chl-a.The results showed that when the N/P ratio was 16:1, the µ_max,K and Chl-a of Thalassiosira pseudonana were all the highest,and G (d) was the shortest.This implied that the optimal N/P ratio of Thalassiosira pseudonana is 16:1.When the N/P ratio was 6:1, the max,K and Chl-a of Gymnodinium sp.were the highest, and G(d) were the shortest,so the optimal N/P ratio of Gymnodinium sp.is 6:1.From the growth curves as indicated both in cell density and Chl-a, it is suggested that the effect of N/P ratio on Chl-a and cell density are almost the same.Different N/P ratios had weak influence on succession of community of algae and the competition between the two algae.Gymnodinium sp.may use the phosphorus in vivo for growth, so it is important to payattention to the concealment of pho-sphorus, in order to avoid the out break of redtide.Based on the import ance of nitrogen and phosphorus and its ratio, the possible outbreak mechanism of red tide was also discussed in this paper.
- N/ P ratio,
- Thalassiosira pseudonana,
- Gymnodinium sp.,
- red tide

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References(19)

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