1. Roles of nitrogen and phosphorus in growth responses and toxin production (using LC-MS/MS) of tropical Microcystis ichthyoblabe and M. flos-aquae
- Author
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Richard P. Lim, Cristina Porojan, Maxine A. D. Mowe, Ambrose Furey, Darren C. J. Yeo, Feras Abbas, and Simon M. Mitrovic
- Subjects
0106 biological sciences ,Cyanobacteria ,biology ,Strain (chemistry) ,Toxin ,010604 marine biology & hydrobiology ,Phosphorus ,Plant physiology ,chemistry.chemical_element ,Plant Science ,010501 environmental sciences ,Aquatic Science ,biology.organism_classification ,medicine.disease_cause ,01 natural sciences ,Nitrogen ,Microbiology ,Nutrient ,chemistry ,Microcystis ,medicine ,Food science ,0105 earth and related environmental sciences - Abstract
In experiments investigating nutrient effects on tropical Microcystis, increasing nitrogen and phosphorus concentrations were found to have a significant positive effect on maximum cell yields of two strains of Microcystis ichthyoblabe (from Lower Peirce and Tengeh Reservoirs) and one strain of Microcystis flos-aquae isolated (Lower Peirce Reservoir) from Singapore. However, only increasing nitrogen concentration had a positive effect on growth rates of M. ichthyoblabe and M. flos-aquae from Lower Peirce Reservoir. MC-RR and MC-LR were produced by all three strains with MC-RR being the dominant variant. Phosphorus played an important role in MC production with increases in phosphorus from medium to high concentrations leading to decreases in MC-RR cell quotas for all three strains at the two highest nitrogen levels tested. The different growth and toxin production responses between M. ichthyoblabe strains could be due to location-specific differences.
- Published
- 2015