Roles of nitrogen and phosphorus in growth responses and toxin production (using LC-MS/MS) of tropical <Emphasis Type="Italic">Microcystis ichthyoblabe</Emphasis> and <Emphasis Type="Italic">M. flos-aquae</Emphasis> |
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| Authors: | Maxine A D Mowe Feras Abbas Cristina Porojan Simon M Mitrovic Richard P Lim Ambrose Furey Darren C J Yeo |
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| Institution: | 1.Department of Biological Sciences,National University of Singapore,Singapore,Singapore;2.Mass Spectrometry Research Centre (MSRC), Department of Physical Sciences,Cork Institute of Technology (CIT),Bishopstown,Ireland;3.School of the Environment,University of Technology, Sydney,Broadway,Australia |
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| 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. |
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