A Kinetics Model for Predicting Microcystis Growth Based on the Synergistic Effect of Nitrogen and Phosphorus on the Growth of Microcystis densa (Cyanobacteria)

Abstract

Introduction Cyanobacteria Microcystis blooms are common in many lakes and reservoirs where they usually cause negative consequences for environment and human health [1, 2]. Usually, these Microcystis blooms are cuased by Microcystis aeruginosa, which produces toxins that poison aquatic life [3]. However, A new Microcystis bloom caused by Microcystis densa has emerged in some subtropical reservoirs in southern China [4]. M. densa are common in rivers, lakes and reservoirs [5], but there is no or rarely reports of its bloom before 2012. However, a M. densa bloom has occurred every summer in Lianhe Reservoir since 2012, causing serious damage to the ecology.

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“…TP concentrations in the facility's discharge remained relatively constant between 2004 through 2014 and then dropped considerably. The overall TN:TP ratio in the facility's discharge during the bloom years of 2009-2012 was 110.6/40.1 (mg L -1 ) = 2.76 (w/w) or 6.11 (mol mol -1 ), corresponding to the low N:P ratios commonly observed in municipal WWTP secondary treatment effluents and to the lower N:P ratios thought to favor M. aeruginosa (Smith, 1990;Paerl, 1988;Fujimoto et al, 1997;Kotak and Zurawell, 2007;Giblin and Gerrish, 2020;Cai and Tang, 2021). Changes in the facility's TN and TP concentrations in its discharges after the bloom period years, however, drove reductions in both parameters as well as changes in the overall TN:TP ratio in the effluent.…”

“…Unlike many other cyanobacteria, M. aeruginosa does not fix dinitrogen (N 2 ), and so requires external nitrogen sources. M. aeruginosa requires high availabilities of inorganic nitrogen (N) and phosphorus (P) to support blooms, but also favors low N:P ratios (Smith, 1990;Paerl, 1988;Fujimoto et al, 1997;Kotak and Zurawell, 2007;Giblin and Gerrish, 2020;Cai and Tang, 2021). Planktonic blooms can be initiated after a benthic resting phase of cells that respond to triggering conditions, allowing repeated outbreaks in host waters (Brunberg and Blomquist, 2002).…”

The Effects of Physical Filtration on the Control of <i>Microcystis aeruginosa</i> at Various Growth Stages

“…With the rapid development of the economy and the expansion of human activity, a large amount of nitrogen, phosphorus, and other elements are discharged into the water, resulting in the eutrophication of lakes and other bodies of water, leading to the proliferation of cyanobacteria [1][2]. The proliferation and abnormal growth of cyanobacteria form blooms and cause algal populations to accumulate, rot, and release algal toxins onto lakeshores and into estuaries [3][4].…”