KMS Chongqing Institute of Green and Intelligent Technology, CAS
| Temperature-Dependent Growth Characteristics and Competition of Pseudanabaena and Microcystis | |
Hu, Lili1,2; Wang, Haiyan1,2; Cui, Jingzhen1,2; Zou, Wansheng1,2; Li, Jie3 ; Shan, Kun4
| |
| 2023-07-01 | |
| 摘要 | Global warming has been considered to accelerate the expansion of cyanobacterial blooms, which are frequently composed of the bloom-forming genera, Microcystis and Pseudanabaena, in freshwater ecosystems worldwide. Nonetheless, the impact of changes due to toxin production or lack thereof on the growth of co-existing strains, both arising from increasing temperature, has remained unknown to date. We conducted competition experiments involving toxic Microcystis PCC7806, a non-toxic mcyB(-) mutant, and two strains of Pseudanabaena (TH-1 and DC-1) identified as P. mucicola. In mono-culture, the specific growth ratio of Pseudanabaena increased; nevertheless, the maximum cell density declined with increasing temperature. The maximum growth ratios of Pseudanabaena TH-1 and Pseudanabaena DC-1 were 0.512 day(-1) in the 30 & DEG;C group and 0.440 day(-1) in the 35 & DEG;C group, respectively. The optimum temperature for the growth of Pseudanabaena was 25 & DEG;C. Remarkably, there was no significant disparity in the maximum cell density of Microcystis PCC7806 and the mcyB(-) mutant across varied temperature groups, even though their maximum growth rates differed marginally, reaching 0.280 day(-1) and 0.306 day(-1) in the 30 & DEG;C group, respectively. In co-cultures, the growth of Pseudanabaena TH-1 was uniformly inhibited, whereas that of DC-1 was somewhat influenced by co-culturing with toxic and non-toxic Microcystis, except for the 35 & DEG;C group, where inhibition was absent amongst DC-1 and Microcystis. Moreover, the growth of Microcystis was promoted with a co-culture of TH-1 in the 20 & DEG;C groups. Conversely, the co-culture of Microcystis with Pseudanabaena DC-1 led to the inhibition of the former in the 30 & DEG;C and 35 & DEG;C groups. With a Lotka-Volterra competition model, the results showed that Microcystis dominated or co-existed with Pseudanabaena, conforming to expectations from the wild. |
| 关键词 | Pseudanabaena Microcystis temperature growth competition |
| DOI | 10.3390/w15132404 |
| 发表期刊 | WATER
 |
| 卷号 | 15期号:13页码:15 |
| 通讯作者 | Li, Jie(jlee@csu.edu.cn) ; Shan, Kun(shankun@cigit.ac.cn) |
| 收录类别 | SCI |
| WOS记录号 | WOS:001028131400001 |
| 语种 | 英语 |
