Temperature-Dependent Growth Characteristics and Competition of Pseudanabaena and Microcystis

Global warming has been considered to accelerate the expansion of cyanobacterial blooms, which are frequently composed bloom-forming genera, Microcystis and Pseudanabaena, in freshwater ecosystems worldwide. Nonetheless, impact changes due toxin production or lack thereof on growth co-existing strains, both arising from increasing temperature, remained unknown date. We conducted competition experiments involving toxic PCC7806, a non-toxic mcyB− mutant, two strains Pseudanabaena (TH-1 DC-1) identified as P. mucicola. In mono-culture, specific ratio increased; nevertheless, maximum cell density declined with temperature. The ratios TH-1 DC-1 were 0.512 day−1 30 °C group 0.440 35 group, respectively. optimum temperature for was 25 °C. Remarkably, there no significant disparity PCC7806 mutant across varied groups, even though their rates differed marginally, reaching 0.280 0.306 co-cultures, uniformly inhibited, whereas that somewhat influenced by co-culturing Microcystis, except where inhibition absent amongst Microcystis. Moreover, promoted co-culture 20 groups. Conversely, led former With Lotka–Volterra model, results showed dominated co-existed conforming expectations wild.