Nur Hanisah binte Sukarji

National University of Singapore

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Zhi Yang Sim

National University of Singapore

Karina Yew‐Hoong Gin

National University of Singapore

Yiliang He

Shanghai Jiao Tong University

Kwan Chien Goh

National University of Singapore

Feijian Mao

Nanjing Hydraulic Research Institute

Shu Harn Te

National University of Singapore

Jerome Wai Kit Kok

National University of Singapore

Luhua You

National University of Singapore

Dong Zhang

Chinese Academy of Sciences

Rong Luo

National University of Singapore

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National University of Singapore

Singapore-HUJ Alliance for Research and Enterprise

Nanjing Hydraulic Research Institute

Chinese Academy of Sciences

Environmental Research Institute

Shanghai Jiao Tong University

Nanyang Technological University

Institute of Tibetan Plateau Research

Chinese Research Academy of Environmental Sciences

Stanford University

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Influence of phytoplankton, bacteria and viruses on nutrient supply in tropical waters

Journal of Environmental Sciences (2024)

Zhi Yang Sim Kwan Chien Goh Nur Hanisah binte Sukarji Feijian Mao Yiliang He

Diel investigations of water environments are one means to holistically understand the dynamics and functional roles of phytoplankton, bacteria and viruses in these ecosystems. They have the potential to substantially impact C, N and P biogeochemistry through their respective roles. This study characterizes the phytoplankton, bacteria and virus communities and the elemental composition of various C, N and P nutrients flow over three diel cycles in tropical urban lake. Our results show that ratios of C:N:P fluctuated strongly from the lack of Dissolved organic phosphorus (DOP) and PO4. Specifically, green algae peaked during day time and exudate Dissolved organic matter (DOM) that strongly modulate Dissolved organic carbon (DOC):DOP ratio to diel DOP limitation. Multiple linear regression and Stella modelling emphasize the roles of viruses together with Synechococcus as important nutrient recyclers of NH4 and PO4 in nutrients-limited waters. Respective normalised surface PO4 and combined surface and bottom NH4 concentration selected both viruses and Synechococcus as important drivers. Process model of N and P biogeochemical cycles can achieve 69% and 57% similar to observed concentration of NH4 and PO4, respectively. A short latent period of 9 hr was calculated, in addition to the calibrated high infectivity of viruses to Synechococcus. Taken together, the rapid turn-over between Synechococcus and viruses has biogeochemical significance, where the rapid recycling of essential nutrients allows for shortcuts in the N and P cycle, supporting a wide range of microbes.

Biogeochemical Cycle

Diel vertical migration

Biogeochemistry

Nutrient cycle

10.1016/j.jes.2024.02.032

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Coexistence of Synechococcus and Microcystis Blooms in a Tropical Urban Reservoir and Their Links with Microbiomes

Environmental Science & Technology (2023)

Shu Harn Te Jerome Wai Kit Kok Rong Luo Luhua You Nur Hanisah binte Sukarji

Bacteria play a crucial role in driving ecological processes in aquatic ecosystems. Studies have shown that bacteria–cyanobacteria interactions contributed significantly to phytoplankton dynamics. However, information on the contribution of bacterial communities to blooms remains scarce. Here, we tracked changes in the bacterial community during the development of a cyanobacterial bloom in an equatorial estuarine reservoir. Two forms of blooms were observed simultaneously corresponding to the lotic and lentic characteristics of the sampling sites where significant spatial variabilities in physicochemical water quality, cyanobacterial biomass, secondary metabolites, and cyanobacterial/bacterial compositions were detected. Microcystis dominated the upstream sites during peak periods and were succeeded by Synechococcus when the bloom subsided. For the main body of the reservoir, a mixed bloom featuring coccoid and filamentous cyanobacteria (Microcystis, Synechococcus, Planktothricoides, Nodosilinea, Raphidiopsis, and Prochlorothrix) was observed. Concentrations of the picocyanobacteria Synechococcus remained high throughout the study, and their positive correlations with cylindrospermopsin and anatoxin-a suggested that they could produce cyanotoxins, which pose more damaging impacts than previously supposed. Succession of different cyanobacteria (Synechococcus and Microcystis) following changes in nutrient composition and ionic strength was demonstrated. The microbiomes associated with blooms were unique to the dominant cyanobacteria. Generic and specialized bloom biomarkers for the Microcystis and downstream mixed blooms were also identified. Microscillaceae, Chthoniobacteraceae, and Roseomonas were the major heterotrophic bacteria associated with Microcystis bloom, whereas Phycisphaeraceae and Methylacidiphilaceae were the most prominent groups for the Synechococcus bloom. Collectively, bacterial community can be greatly deviated by the geological condition, monsoon season, cyanobacterial density, and dominant cyanobacteria.

Microcystis

10.1021/acs.est.2c04943

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Citations (18)