Comparative studies on phosphate utilization of two bloom-forming Microcystis spp. (cyanobacteria) isolated from Lake Taihu (China)

Abstract

Microcystis is a common freshwater bloomdominating cyanobacterial genus. However, the crucial factors that affect the seasonal succession and extent of dominance of different species remain largely unknown. This study investigated inorganic phosphorus (P) uptake, growth, and P utilization of two dominant Microcystis species from Lake Taihu (China) at different P concentrations and temperatures. Compared with Microcystis wesenbergii, Microcystis flosaquae had higher maximum uptake rate and luxury storage coefficient. However, M. flos-aquae also had a higher P demand for growth. Under P-rich conditions (64.5 to 174.5 μM), M. flos-aquae had a higher growth rate (0.16 to 0.21 d ) at 22 to 30°C. M. wesenbergii, with higher phosphate affinity, had a lower P demand to sustain its growth, and yielded a higher growth rate of 0.10 d −1 at low P concentration (6.5 μM) at 34°C, whereas M. flos-aquae had a lower growth rate of 0.03 d −1. Therefore, M. flos-aquae was dominant in late spring under P-rich conditions, whereas M. wesenbergii prevailed in hot summer after M. flos-aquae decreased under P-limited conditions. These results agree well with their succession patterns in the field. Overall, succession and dominance of M. flos-aquae and M. wesenbergii in Lake Taihu are regulated by P concentration and water temperature.

Differences in vertical distribution of Microcystis morphospecies composition in a shallow hypertrophic lake (Lake Taihu, China)

“…However, our results showed that both M. wesenbergii and M. aeruginosa negatively related to temperature but M. ichthyoblabe positively related to temperature. Yue et al (2014) reported that M. wesenbergii dominated under P-limited condition but we found that M. wesenbergii negatively related to TDP concentration. Some other factors such as iron (Xing et al 2007) and wind shearing (Otten and Paerl 2011) are also important factor for determining the dominant Microcystis morphospecies.…”

Chemodiversity of Cyanobacterial Toxins Driven by Future Scenarios of Climate Warming and Eutrophication

“…Although cyanobacteria already dominated the community under the premise of 31 °C at the end of the experiment, the increase of temperature (+3 °C) further compressed the living space of other algae and led to the absolute dominance of Microcystis . Therefore, our experimental results confirm that the response of experimental subjects to increasing temperature is still significant under the premise of higher ambient temperature and caused the increase of cyanobacterial toxin concentration in water, which were proven by Yue et al and Li et al earlier. Moreover, we found, in agreement with Retnamma et al, that nutrient enrichments also can promote the individual cell volume of Microcystis (Figures – and Table S3).…”

An insight into potential phosphate bioremediation and renewable energy from agricultural waste via integrated wastewater treatment systems in Indonesia

“…As noted above, P is essential for various cellular functions, including cell structure, energy production, and genetic information storage and transfer (Blank et al 2012, Wagner 2023. Certain microalgae espesially cyanobacteria are known to employ a competitive adaptation strategy, storing P during periods of high availability to support growth during periods of lower P concentration (Carey et al 2012, Yue et al 2013, Jentzsch et al 2023. In the realm of cyanobacterial research, Synechocystis sp.…”