1School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, PR China.
2School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, PR China.
Microbiology (Reading). 2018 Dec;164(12):1514-1521. doi: 10.1099/mic.0.000735. Epub 2018 Oct 26.
Eutrophication is caused by the rapid growth of microalgae. Iron and manganese are important micronutrients for microalgae growth. However, the effect of the limitation of iron and manganese on microalgae growth in fresh water has not been well understood. In this study, natural mixed algae, Anabaena flosaquae and Scenedesmus quadricanda, were cultivated under different quotas of iron and manganese to reveal the effect of the limitation of iron and manganese on the growth of microalgae in fresh water. The results showed that the growth rate of algae is influenced more by iron than by manganese. However, the effect of manganese cannot be overlooked: when the initial manganese quota was replete, i.e. 0.6-0.8 mg l, manganese was able to relieve the effect of iron limitation on microalgae growth in fresh water. We further found that the microalgae showed an uptake preference for iron over manganese. Iron had a competitive effect on manganese uptake, while manganese had less impact on iron uptake by microalgae. The information obtained in the current study is useful for the provision of water quality warnings and for the control of microalgae bloom in fresh water.
富营养化是由微藻的快速生长引起的。铁和锰是微藻生长的重要微量元素。然而，铁和锰限制对淡水微藻生长的影响还没有得到很好的理解。在这项研究中，天然混合藻类鱼腥藻和四尾栅藻在不同的铁锰配额下进行培养，以揭示铁锰限制对淡水微藻生长的影响。结果表明，藻类的生长速度受铁的影响大于锰。然而，锰的影响不容忽视：当初始锰配额充足时，即 0.6-0.8mg/L，锰能够缓解铁限制对淡水微藻生长的影响。我们进一步发现，微藻对铁的吸收有偏好，超过了对锰的吸收。铁对锰的吸收有竞争作用，而锰对微藻铁的吸收影响较小。本研究获得的信息有助于提供水质预警，并控制淡水微藻水华。
