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Harmful Algae

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lightbulbAbout this topic
Harmful algae refer to specific species of algae that produce toxins or cause detrimental effects on aquatic ecosystems, human health, and marine life. These algal blooms can lead to oxygen depletion, fish kills, and the contamination of water supplies, posing significant ecological and economic challenges.
lightbulbAbout this topic
Harmful algae refer to specific species of algae that produce toxins or cause detrimental effects on aquatic ecosystems, human health, and marine life. These algal blooms can lead to oxygen depletion, fish kills, and the contamination of water supplies, posing significant ecological and economic challenges.

Key research themes

1. What are the ecological drivers and management strategies for cyanobacterial harmful algal blooms in freshwater systems?

This research theme focuses on understanding the ecological conditions, nutrient dynamics, physiological traits, and environmental controls that promote cyanobacterial harmful algal blooms (cyanoHABs) in freshwater bodies. It also evaluates management strategies, especially nutrient reduction (nitrogen and phosphorus), hydrologic modifications, and how anthropogenic impacts and climatic factors interact to influence bloom dynamics. As cyanoHABs pose significant risks to water quality, ecosystem function, and public health, effective management and prediction are critical.

Key finding: Demonstrated that cyanobacteria's physiological adaptations—such as nitrogen fixation, vertical migration, tolerance to extreme light and temperature conditions—and their responses to nutrient inputs (primarily nitrogen and... Read more
Key finding: Provided comprehensive evidence that cyanobacterial genera such as Microcystis, Dolichospermum, Aphanizomenon, and Planktothrix dominate toxin-producing blooms in U.S. inland waters. Found that human and animal health impacts... Read more
Key finding: Identified urban stormwater ponds as hotspots for cyanoHAB formation due to eutrophication driven by anthropogenic nutrient inputs, impaired flushing, and stable thermal stratification. Reported multiple cyanotoxins including... Read more

2. How do harmful algal blooms impact and challenge the sustainability of aquaculture and fisheries industries globally?

This theme addresses the specific consequences of harmful algal blooms (HABs) on aquaculture and fisheries, including human health risks from toxin bioaccumulation in shellfish and finfish, economic losses due to harvesting closures and fish kills, and the challenges HABs pose to shellfish safety monitoring and early warning systems. Research investigates the occurrence of toxic species, their geographic distribution, toxin production, and emerging technologies to forecast blooms to minimize impacts on the seafood industry and public health.

Key finding: Reviewed the development of Early Warning Systems (EWS) in the North-East Atlantic that integrate harmful algal bloom monitoring, satellite remote sensing, oceanographic modeling, and toxin analysis to support timely... Read more
Key finding: Provided an extensive regional overview of ~72 harmful algal bloom incidents affecting seafarming since 1934 in the Asia-Pacific, with fish kills constituting 57% of events and paralytic shellfish poisoning (PSP) comprising... Read more
Key finding: Case study of major HAB impacts in Chile's southern coastal waters demonstrated devastating losses in salmon aquaculture from a Pseudochattonella bloom killing 39 million salmon (~US$800 million) and subsequent paralytic... Read more
Key finding: Detected pervasive presence of multiple algal toxins including microcystins (MCs), okadaic acid (OA), and domoic acid (DA) in marine waters near salmon aquaculture sites in coastal British Columbia, with evidence linking... Read more

3. What are the current advances in detection, evaluation, and mitigation of toxic algal blooms and their harmful effects on ecosystems and human health?

Research under this theme examines innovative biological, genomic, and technological methods to assess harmful algal blooms, including assessing genotoxic potential, genomic characterization of toxin-producing cyanobacteria, bioindicator approaches, and advances in food safety of algae-derived products. It also addresses the challenges in microplastic pollution co-occurring with algal toxins, and stresses the importance of coordinated interdisciplinary approaches to manage and mitigate the ecological and health impacts of harmful algae.

Key finding: Pioneered the application of Tradescantia (spiderwort) bioassays (Trad-SHM and Trad-MN) for assessing genotoxicity induced by HAB events, demonstrating a correlation between algal abundance and genotoxic effects such as... Read more
Key finding: Investigated the prevalence of microplastic contaminants across freshwater, groundwater, and coastal systems in Chennai, India, identifying industrial discharge and urban runoff as primary sources. Compared conventional... Read more
Key finding: Synthesized physical, chemical, and microbiological risks to food safety from algae consumption, highlighting that microbial contamination is a leading cause of algal foodborne diseases. Reviewed the state-of-art rapid... Read more

All papers in Harmful Algae

Rising concentrations of atmospheric CO2 results in higher equilibrium concentrations of dissolved CO2 in natural waters, with corresponding increases in hydrogen ion and bicarbonate concentrations and decreases in hydroxyl ion and... more
As freshwater bodies become enriched in nutrients, there is a shift in the phytoplankton commun i t y t o w a r d d o m i n a n c e b y c y a n o b a c t e r i a . Cyanobacterial blooms are a significant problem in water supply reservoirs... more