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Restoration of Pandan Reservoir in Singapore using Macrophytes ­- A Mesocosm Study

Project Member(s): Mitrovic, S.

Funding or Partner Organisation: National University of Singapore

Start year: 2016

Summary: This is a collaboration with the National University of Singapore (NUS) where Dr Simon Mitrovic is a developer and co-PI and all field work will be done in Singapore. Simon will also co-supervise a postdoc and PhD student based at NUS. The overall objectives of this study are the determination of trigger macrophyte-densities that lead to a switch from cyanobacteria/phytoplankton-dominated to macrophyte-dominated states in Pandan Reservoir, Singapore taking into account how light, nutrients, and allelopathy may influence this. This will be achieved through first a series of single-species small mesocosm experiments that will identify which macrophytes (submergents and emergents, specifically emergents with herbaceous stems that will be grown on the bank/floating platforms) are most active against cyanobacteria/phytoplankton, and what macrophyte density is required to reduce cyanobacterial/phytoplankton biomass. Based on these results, a series of medium scale mesocosm experiments will then test different densities of various combinations of selected submerged and emergent macrophytes on cyanobacteria and phytoplankton over a 1–2 month period to determine the most effective densities and combinations. From the results of the first two series of experiments, large mescosm experiments (approximately 100 m2 each) will be undertaken in one reservoir (Pandan Reservoir) over a period of 12 months in order to capture seasonal (monsoonal) variation. A final report with management recommendations will be delivered, as well as an implementation plan for the use, planting, and maintenance of macrophytes to change lake states in Pandan Reservoir.

Keywords: macrophytes, cyanobacteria, lakes,

FOR Codes: Environmental Management, Land and Water Management of environments not elsewhere classified, Other environmental management not elsewhere classified