Effects of N/P Atomic Ratio on the Growth of Alexandrium Tamarense at Various Initial Phosphate Concentrations

Abstract:

To reveal the relationship between nutrient input and red tide outbreaks, the effects of N/P atomic ratio on the specific growth rate of Alexandrium tamarense is analyzed under various initial phosphate concentrations in laboratory cultures. The results show that both the cell density and the specific growth rate of A.tamarense first increased when the N/P atomic ratio ≤ (N/P)_opt and then decreased when the N/P atomic ratio ≥ (N/P)_opt in low-P-grown cultures, followed by those in medium-P-grown and high-P-grown cultures. And the highest cell density in low-P-grown, medium-P-grown, and high-P-grown cultures is 1776×10⁴, 4094×10⁴ and 6891×10⁴ cells/L, respectively. The maximum specific growth rate is 4.022, 5.307 and 9.672 d^-1, respectively. It seems that the higher the initial phosphate concentrations, the greater the probability of red tide outbreaks.

• Periodical: Advanced Materials Research (Volumes 455-456)
• Pages: 1289-1296
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.455-456.1289
• Online since: January 2012
• Authors: Shi Yong Wen, Dong Zhi Zhao, Li Li Song, Hua Long
• Keywords: Alexandrium Tamarense, Cell Density, Growth Characteristic, Maximum Specific Growth Rate, N/P Atomic Ratios

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