College of Environmental Science and Engineering, Dalian Maritime University, No. 1 Linghai Road, Dalian, 116026, PR China.
College of Environmental Science and Engineering, Dalian Maritime University, No. 1 Linghai Road, Dalian, 116026, PR China.
Plant Physiol Biochem. 2024 Sep;214:108948. doi: 10.1016/j.plaphy.2024.108948. Epub 2024 Jul 18.
The eutrophication of water, such as excessive nitrogen and phosphorus, are closely associated with the outbreak of red tide. However, the response of dissolved inorganic phosphorus (DIP) to red tide remained unclear in water. In this study, three species of diatoms capable of causing red tides were cultured in simulated seawater with different concentrations of DIP. The changes of biomass, chlorophyll a concentration and the carbon stable isotope composition of microalgae, the DIP concentration and pH of the culture medium were compared among the experimental groups. In addition, correlation verification was used to test the correlation between the change of DIP concentration and other indicators. The results showed that in the experimental period, the DIP concentration of each experimental group decreased significantly first, and the concentration dropped to less than 40% of the initial level. After that, the pH of the medium, the biomass, chlorophyll a concentration and carbon stable isotope composition of the microalgae showed varying degrees of increase, and then stabilized or decreased. These also marked the outbreak of red tide. Moreover, the correlation test showed that there was a correlation between them and the change of DIP concentration. Therefore, by exploring the relationship between the change of DIP concentration in water and the occurrence of red tide, this study provides a possible direction for the current prediction of red tide, and provides a basis for further investigation of the occurrence mechanism of red tide.
水体富营养化，如氮、磷过量等，与赤潮的爆发密切相关。然而，水中赤潮爆发对溶解无机磷（DIP）的响应仍不清楚。本研究在不同 DIP 浓度的模拟海水中培养了三种能引发赤潮的硅藻，比较了实验组中生物量、叶绿素 a 浓度和微藻的碳稳定同位素组成、培养液中 DIP 浓度和 pH 的变化。此外，还采用相关验证来检验 DIP 浓度变化与其他指标之间的相关性。结果表明，在实验期间，各实验组的 DIP 浓度先明显下降，浓度降至初始水平的 40%以下。之后，培养基的 pH 值、微藻的生物量、叶绿素 a 浓度和碳稳定同位素组成都有不同程度的增加，然后稳定或下降。这也标志着赤潮的爆发。而且，相关测试表明，它们与 DIP 浓度的变化之间存在相关性。因此，通过探究水中 DIP 浓度变化与赤潮发生的关系，本研究为当前赤潮的预测提供了一个可能的方向，并为进一步研究赤潮的发生机制提供了依据。
