Wed 02 May 2018: 4.00pm [QE] – Darren Sim on “Phytoplankton-Regulation by Macrophytes in Tropical Lakes”

Department of Biological Sciences, NUS
Qualifying Examination

Phytoplankton-Regulation by Macrophytes in Tropical Lakes

Speaker:             Sim Zong Han Darren (Graduate Student, Dept. of Biological Sciences, NUS)
Date:                   2 May 2018, Wednesday
Time:                   4pm
Venue:                DBS Conference Room (S3 Level 5)
Supervisor:        Asst Prof Darren Yeo Chong Jinn
 

Abstract: – Ecological restoration can be a sustainable strategy to manage nuisance phytoplankton in Singapore reservoirs. Macrophytes are vital for restoring degraded lakes due to their involvement in ecological processes, especially their role in maintaining the clear water stable state in lakes. This is attributed to their ability to regulate phytoplankton communities through a combination of physical and biological mechanisms such as attenuation of wave energy, resource competition, and allelopathy. Allelopathy is suspected to be a major mechanism by which macrophytes inhibit phytoplankton, but current evidence supporting this is inconclusive. Present understanding of lake restoration is largely based on temperate studies, which may have limited transferability to the tropics due to trophic and climatic differences.

This study uses various approaches to investigate the ability of macrophytes to improve the ecological state of turbid tropical lakes. Field mesocosm experiments will be used to evaluate (i) the effects of macrophytes on phytoplankton communities and (ii) the potential restorative capability of macrophytes in a turbid reservoir. Lab experiments will be conducted to evaluate the importance of allelopathy as a mechanism to control phytoplankton and the role of light in influencing its effectiveness. Findings will not only improve our understanding of macrophyte-phytoplankton interactions, but also inform lake management decisions using macrophyte restoration as a sustainable tool to control phytoplankton blooms.

All are welcome

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