Research
| Title： | Increase in CO2 concentration reduces the competitiveness of 2-methylisoborneol-producing cyanobacteria: evidence from Pseudanabaena |
|---|---|
| First author： | Qiu, Pengfei; Mi, Wujuan; Song, Gaofei; Cheng, Fengfeng; Bi, Yonghong |
| Journal： | JOURNAL OF OCEANOLOGY AND LIMNOLOGY |
| Years： | 2025 |
| DOI： | 10.1007/s00343-025-4244-8 |
| Abstract： | The global rise in CO2 concentration is having a profound impact on the structure and function of aquatic ecosystems. However, little information is available on the responses of odor-producing cyanobacteria to the increase in CO2 concentration. In this study, the effects of different CO2 concentrations on 2-methylisoborneol (MIB)-producing Pseudanabaena and non-2-MIB-producing Pseudanabaena under monoculture and co-culture conditions were investigated. Results show that the specific growth rate of Pseudanabaena gradually increased with the rise in CO2 concentration, and for the 2-MIB-producing strain, this increase was significantly higher than the non-2-MIB-producing strain. Under co-culture conditions, the proportion of non-2-MIB-producing Pseudanabaena was significantly higher than that of 2-MIB-producing Pseudanabaena, suggesting a superior competitive ability of non-2-MIB-producing Pseudanabaena over 2-MIB-producing Pseudanabaena. Under monoculture conditions, the total 2-MIB production at the 300-mu g/g CO2 concentration was significantly higher than that at 600- and 1 200-mu g/g CO2 concentrations. The 2-MIB concentration produced by Pseudanabaena decreased with the increasing in CO2 concentration. Therefore, we believe that with the future increase in CO2 concentration, 2-MIB concentration would be decreased and so would the risk of 2-MIB outbreaks. |
