Effects of lanthanum(III) and EDTA on the growth and competition of Microcystis aeruginosa and Scenedesmus quadricauda |
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| Authors: | Xiangcan Jin Zhaosheng Chu Qingru Zeng |
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| Institution: | a State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center for Lake Ecology and Environments, Chinese Research Academy of Environmental Sciences (CRAES), Beijing 100012, China
b Department of Environmental Technology, Hunan Agricultural University, Hunan 410128, China |
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| Abstract: | Rare earth elements (REEs) are widely used to increase crop production in China. However, little attention has been paid to their impacts on aquatic ecology. Batch cultivation was used here to study the effects of lanthanum (La) and EDTA on the growth and competition of the cyanobacterium Microcystis aeruginosa and the green alga Scenedesmus quadricauda. When EDTA was present at a very low concentration (0.269 μmol L−1), low lanthanum concentrations (?7.2 μmol L−1) had little stimulative effect on the growth of M. aeruginosa and S. quadricauda, whereas a high lanthanum concentration (72 μmol L−1) had significant inhibitory effect on both of them. The results of cultivation experiments suggested that the inhibitory effect on M. aeruginosa was higher than that on S. quadricauda and S. quadricauda could become dominant in mixed cultures. When lanthanum was not added to the culture medium, high EDTA concentrations (>13.4 μmol L−1) had a great inhibitory effect on the growth of M. aeruginosa but little effect on the growth of S. quadricauda, which could become dominant in the mixed cultures.Lanthanum and EDTA had complex effects on the growth and competition of M. aeruginosa and S. quadricauda. EDTA did not change the stimulation of low lanthanum concentrations on both, but at intermediated concentrations (2.69-13.4 μmol L−1) it could greatly alleviate lanthanum inhibition on M. aeruginosa; thus, M. aeruginosa would dominate S. quadricauda in these mixed cultures. Lanthanum at low concentration (7.2 μmol L−1) could also alleviate the inhibition of high EDTA on M. aeruginosa, but did not alter the outcome of the competition. |
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| Keywords: | Lanthanum Rare earth elements Microcystis Scenedesmus Competition |
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