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- Title
High temperature and pH favor <italic>Microcystis aeruginosa</italic> to outcompete <italic>Scenedesmus obliquus</italic>.
- Authors
Yang, Jingwen; Tang, Hengxing; Zhang, Xingxing; Zhu, Xuexia; Huang, Yuan; Yang, Zhou
- Abstract
Competition between cyanobacteria and green algae affects phytoplankton succession and the well-known cyanobacteria blooms. Climate warming and water acidification are two concerned environmental issues changing the freshwater ecosystems. To investigate the competitive responses of phytoplankton to warming and acidification, we co-cultured <italic>Microcystis aeruginosa</italic> and <italic>Scenedesmus obliquus</italic> at a temperature range of 15–35 °C and a pH range of 5–9. Results showed that <italic>S</italic>. <italic>obliquus</italic> was superior competitor at 15 °C. At 20–30 °C, the populations of both <italic>Scenedesmus</italic> and <italic>Microcystis</italic> were inhibited by the presence of each other. <italic>S</italic>. <italic>obliquus</italic> was in competitive domination at the initial phase of cultivation, but was finally replaced by <italic>M</italic>. <italic>aeruginosa</italic>. <italic>Microcystis</italic> kept competition advantage at 35 °C, whereas <italic>Scenedesmus</italic> outcompeted <italic>Microcystis</italic> at acidic conditions (pH ≤ 6). Neutral and weakly alkaline conditions (pH 7–9) supported the replacement of competition domination from <italic>Scenedesmus</italic> to <italic>Microcystis</italic>. The present study revealed that climate warming may accelerate the phytoplankton succession from green algae to cyanobacteria, with the predicted promoted cyanobacteria blooms. Nonetheless, water acidification causes <italic>Microcystis</italic> to be a weak competitor with green algae, suggesting that the advantageous effect of <italic>Microcystis</italic> toward green algae at high temperatures was controlled by other variables like the water pH.
- Subjects
MICROCYSTIS aeruginosa; HIGH temperatures; PHOTOSYNTHESIS; CHROOCOCCACEAE; TEMPERATURE
- Publication
Environmental Science & Pollution Research, 2018, Vol 25, Issue 5, p4794
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-017-0887-0