Review
Medicine, General & Internal
Chris C. Lim, Jeonggyo Yoon, Kelly Reynolds, Lynn B. Gerald, Andrew P. Ault, Seulkee Kleo, Michelle L. Bell
Summary: Harmful algal blooms (HABs) are increasing globally, and the relationship between HAB aerosols and human health remains unclear. This review synthesizes current knowledge and identifies gaps in understanding this relationship. Some HAB aerosols have been linked to respiratory outcomes, but direct measurements of aerosol or toxin concentrations are lacking, and epidemiological studies are limited. Further research is needed to explore the health effects of other HAB species, dose-response relationships, effects of concurrent exposures, the impact of long-term exposures, and disparities in vulnerable populations.
Article
Food Science & Technology
Caiyun Zhang
Summary: This study analyzed the temporal and spatial variability of harmful algal blooms (HABs) in coastal waters of Fujian. It found that the number and impact area of HABs varied significantly over different decades, with the highest occurrence in the 2000s. The proportion of HABs caused by dinoflagellates decreased, while the proportion caused by diatoms increased. In the 2010s, toxic HAB events caused by Karenia mikimotoi increased in frequency and spatial coverage along the central Fujian coast.
Article
Environmental Sciences
Wenyu Wei, Yue Han, Yuntao Zhou
Summary: This study investigates the effects of climate change on harmful algal blooms (HABs) in coastal China. The researchers analyze HAB observed data since 1981 and identify the key environmental drivers of HABs, such as nutrients, sea surface temperature (SST), and precipitation. The results show that HABs have expanded their geographic range and increased their impacting period in China's near seas. Rising total nitrogen (TN) or SST is found to be the dominant factor driving the increase in HABs. The study highlights the importance of controlling watershed nutrient input to mitigate marine eutrophication.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Marine & Freshwater Biology
Aude Boivin-Rioux, Michel Starr, Joel Chasse, Michael Scarratt, William Perrie, Zhenxia Long, Diane Lavoie
Summary: Harmful algal blooms pose a threat to human health, local economies, and coastal ecosystems. The use of GAMMs and climate simulations predicts an increase in blooms of Dinophysis acuminata and Dinophysis norvegica, while blooms of Pseudo-nitzschia seriata are predicted to stabilize or decrease in the future on the Canadian East Coast.
Article
Environmental Sciences
Jun Sha, Haiyan Xiong, Chengjun Li, Zhiying Lu, Jichao Zhang, Huan Zhong, Wei Zhang, Bing Yan
Summary: The study analyzed 5720 published literatures on HABs studies in the past 30 years, presenting emerging trends, environmental and human health risks, prevention and control strategies, and future developments. The review provides a global perspective on HABs and emphasizes the need for immediate responses.
Article
Environmental Sciences
Mohammad Javad Zare Sakhvidi, Jun Yang, Danial Mohammadi, Hussein FallahZadeh, Amirhooshang Mehrparvar, Mark Stevenson, Xavier Basagana, Antonio Gasparrini, Payam Dadvand
Summary: Extreme temperatures can affect the risk of traffic crashes, particularly motorcycle crashes. Exposure to extremely cold and hot temperatures increases the risk of seeking medical attention for motorcycle crashes, especially within 0 to 3 days after exposure. The study estimates that approximately 11.01% of motorcycle crash medical attendances are attributable to non-optimal temperatures.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Peng Zhang, Conghui Peng, Jibiao Zhang, Junxiao Zhang, Jiyu Chen, Hui Zhao
Summary: Climate change and anthropogenic pressures have significantly impacted coastal environments, including Zhanjiang Bay, which has experienced increased eutrophication and harmful algal blooms (HABs). Nutrient patterns have changed over the past 30 years, resulting in a shift from a phosphorus-limited oligotrophic state to a nitrogen-limited eutrophic state. Integrated land-ocean environment management is needed to mitigate pollution sources and control HABs.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Yuntao Zhou, Weijin Yan, Wenyu Wei
Summary: Coastal harmful algal blooms (HABs) in China's seas, particularly in the East China Sea, have attracted researchers' attention for decades. The impact of climate change and anthropogenic dominant factors on HABs is not well quantified, but future projections indicate a significant increase in HAB events in the East China Sea due to climate change.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Weiwen Ye, Feng Zhang, Zhenhong Du
Summary: This article introduces a two-step scheme that combines LSTM with EVA for detecting harmful algal blooms in optically complex coastal waters. By building a time series model and extreme value analysis, it improves the accuracy of HAB detection and dynamic extraction capabilities.
Article
Environmental Sciences
Jinge Ma, Steven Loiselle, Zhigang Cao, Tianci Qi, Ming Shen, Juhua Luo, Kaishan Song, Hongtao Duan
Summary: Under the influence of climate warming and human activities, large lakes worldwide have experienced an increase in eutrophication and algal blooms. This study utilizes daily satellite observations to develop an algorithm that accurately identifies the spatiotemporal distribution of algal bloom dynamics in large lakes. The findings show positive trends in bloom area, frequency, and an earlier bloom time, with climate factors and human activities identified as key drivers.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Kelly Luis, Philipp Koehler, Christian Frankenberg, Michelle Gierach
Summary: This study explores the use of TROPOMI's red SIF for detecting Karenia brevis, comparing it with the standard remote sensing HAB indicator MODIS-Aqua. The results show that red SIF provides more spatiotemporal fluorescence information than nFLH and can be used for detection under cloudy conditions, which improves early warning systems for harmful algal blooms.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Nina Novikova, Hannah Matthews, Isabelle Williams, Mary A. Sewell, Michel K. Nieuwoudt, M. Cather Simpson, Neil G. R. Broderick
Summary: In this study, 1064 nm confocal Raman spectroscopy combined with multivariate statistical analysis techniques was used to measure the differences in cell viability of different phytoplankton species. The combination of near-infrared Raman spectroscopy and multivariate data analysis allowed for reliable monitoring of small spectral changes and identification of specific features that classify cells as viable or nonviable. Carotenoid bands at 1527 and 1158 cm(-1) showed the most significant differences upon cell death.
Article
Environmental Sciences
Donald Scavia, Yu-Chen Wang, Daniel R. Obenour
Summary: Ecological models are important for predicting ecosystem responses to stresses, and their reliability depends on long records, skill assessments, and quantifying uncertainty. This study focuses on Lake Erie harmful algal blooms and enhances a Bayesian model using new information and a larger dataset. The model explains a significant portion of the variability in bloom size and performs better than previous forecasts.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Abhinav Gupta, Mohamed M. Hantush, Rao S. Govindaraju
Summary: Harmful algal blooms of cyanobacteria (CyanoHAB) have become a serious environmental concern in various water bodies. The growth dynamics of CyanoHAB are predictable at coarser timescales but chaotic at very short timescales. This study aimed to forecast CyanoHAB cell count at sub-monthly timescales using satellite-derived cyanobacterial index (CI) as a surrogate measure. Four statistical models were developed and the best predictions were obtained using random forest (RF) and ensemble average (EA) algorithms. The results showed that coarser timescale variables and nutrients from rivers other than the Maumee River were important in explaining the variations in CI.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Katherine M. Roche, Alexa R. Sterling, Tatiana A. Rynearson, Matthew J. Bertin, Bethany D. Jenkins
Summary: Shellfish harvesting in Narragansett Bay, Rhode Island, USA, was closed for the first time in 2016-17 due to neurotoxin domoic acid produced by Pseudo-nitzschia diatoms. Different Pseudo-nitzschia species exhibit variations in toxin production, making species identification critical for understanding harmful algal blooms. Long-term DNA preservation in plankton biomass allows for metabarcoding of archived samples to track species composition changes over time, providing valuable insights into ecological factors impacting algal blooms. Annual differences in Pseudo-nitzschia composition were found to be correlated with physical and chemical conditions, with water temperature playing a predominant role.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Marine & Freshwater Biology
Gustaaf M. Hallegraeff, Laura Schweibold, Enora Jaffrezic, Lesley Rhodes, Lincoln MacKenzie, Brenda Hay, Hazel Farrell
Summary: Australia and New Zealand both have similarities and differences in terms of harmful algal species occurrences and their impacts on human society, such as toxic shellfish toxin production. While both countries have experienced harmful algal events, the predominant seafood toxin syndromes differ between Australia and New Zealand.
Article
Biology
Marius N. Mueller, Frederico P. Brandini, Thomas W. Trull, Gustaaf M. Hallegraeff
Summary: The study found that environmental factors such as temperature, irradiance, carbonate chemistry, and macronutrient limitation significantly affect the coccosphere, coccolith, and cell volume of the Southern Ocean Emiliania huxleyi ecotype A. There is a strong correlation between cell and coccolith volume, indicating that coccolith volume is primarily controlled by physiological changes in cell volume. Macronutrient limitation, particularly of phosphorus and nitrogen, has the greatest influence on coccolith volume compared to other environmental drivers.
Article
Marine & Freshwater Biology
Alison Turnbull, Navreet Malhi, Andreas Seger, Jessica Jolley, Gustaaf Hallegraeff, Quinn Fitzgibbon
Summary: The study found that Southern Rock Lobsters exposed to and accumulating shellfish toxins in a controlled aquaculture setting did not show significant impacts on behavior, health, and nutrition; however, certain hematolymph biochemistry parameters showed changes indicating stress response.
AQUATIC TOXICOLOGY
(2021)
Editorial Material
Marine & Freshwater Biology
Gustaaf Hallegraeff, Henrik Enevoldsen, Adriana Zingone
Summary: The special issue presents a diverse picture of harmful algal bloom types and their socio-economic impacts at regional and subregional scale. The intensity and frequency of HAB events vary among regions, with some areas managing to control adverse effects on human health through increased monitoring activities, while risks to human activities and economic activities continue to exist.
Article
Multidisciplinary Sciences
L. Armbrecht, G. Hallegraeff, C. J. S. Bolch, C. Woodward, A. Cooper
Summary: By using hybridisation capture techniques and bioinformatic tools, we successfully increased the relative abundance of marine eukaryote sedaDNA and established a new proxy for evaluating its authenticity. This approach opens up new avenues for studying the long-term changes and evolution of marine eukaryotes over geological timescales.
SCIENTIFIC REPORTS
(2021)
Article
Food Science & Technology
Alison Turnbull, Andreas Seger, Jessica Jolley, Gustaaf Hallegraeff, Graeme Knowles, Quinn Fitzgibbon
Summary: The research shows that Southern Rock Lobsters exposed to toxic algal cells did not accumulate PST toxins and did not have any negative impacts on their health. This suggests that there is no risk of PST accumulation or negative effects on survival or quality from exposure to toxic algal cells.
Article
Marine & Freshwater Biology
Kyoko Yarimizu, Sirje Sildever, Yoko Hamamoto, Satoshi Tazawa, Hiroshi Oikawa, Haruo Yamaguchi, Leila Basti, Jorge I. Mardones, Javier Paredes-Mella, Satoshi Nagai
Summary: The study successfully quantified the copy numbers of rRNA genes per single cell in 16 phytoplankton species using dPCR technology, utilizing a newly developed universal primer set. Chelex buffer was found suitable for DNA extraction to avoid underestimation of the gene copy numbers.
Article
Environmental Sciences
Jorge Mardones, Javier Paredes, Marcos Godoy, Rudy Suarez, Luis Norambuena, Valentina Vargas, Gonzalo Fuenzalida, Elias Pinilla, Osvaldo Artal, Ximena Rojas, Juan Jose Dorantes-Aranda, Kim J. Lee Chang, Donald M. Anderson, Gustaaf M. Hallegraeff
Summary: The Pseudochattonella verruculosa led to the largest farmed fish mortality ever recorded in the world, causing losses of US$ 800 M for the Chilean salmon industry in 2016. Strong climatic anomalies resulted in vertical water column stratification, promoting development of a dynamic P. verruculosa thin layer. The algal cell densities were high and contained potentially harmful fatty acids, which may have contributed to the fish mortality.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Medicinal
Alison Turnbull, Juan Jose Dorantes-Aranda, Tom Madigan, Jessica Jolley, Hilary Revill, Tim Harwood, Gustaaf Hallegraeff
Summary: Paralytic shellfish toxins were found in Southern Rock Lobster from Tasmania's east coast, associated with toxic dinoflagellate blooms. Through 8 years of data collection, a cost-effective strategy was established for managing toxin risk in the Tasmanian lobster fishery, using sentinel species and sampling of five individual lobsters at specific sites.
Article
Biochemistry & Molecular Biology
Kyoko Yarimizu, Jorge Mardones, Javier Paredes-Mella, Luis Norambuena-Subiabre, Carl J. Carrano, Fumito Maruyama
Summary: This study investigated how iron conditions affect the growth and toxin production of A. catenella isolated from southern Chile, finding that optimal iron concentration is crucial for growth, while excess or insufficient iron can impact growth and toxin production.
Article
Food Science & Technology
Ana Flores-Lenero, Valentina Vargas-Torres, Javier Paredes-Mella, Luis Norambuena, Gonzalo Fuenzalida, Kim Lee-Chang, Jorge Mardones
Summary: This study confirms the occurrence of Heterosigma akashiwo in Chilean waters and provides insights into its growth conditions and cell characteristics. The findings suggest that the high production of long-chain PUFA and high ROS production may contribute to salmon mortality during H. akashiwo bloom events.
Review
Plant Sciences
Gustaaf M. Hallegraeff, Ruth S. Eriksen, Claire H. Davies, Julian Uribe-Palomino
Summary: This study reviewed 64 species of marine planktonic dinoflagellates from the Australian waters, confirming several causative organisms of diarrhetic shellfish poisoning. The ornate tropical genera Ornithocercus and Histioneis serve as warm-water indicators, while D. truncata is a cold-water Subantarctic species.
AUSTRALIAN SYSTEMATIC BOTANY
(2022)
Article
Plant Sciences
Luis Castro-Cera, Dario Vega-Diaz, Ruth S. Eriksen, Karine Leblanc, Gustaaf M. Hallegraeff
Summary: We reported the findings of the circumtropical dinoflagellate Tripos lanceolatus (Kofoid) F. Gomez from the Colombian Caribbean, with new records from the tropical western Pacific off Tonga and the Australian sector of the Indian Ocean. Scanning electron micrographs showed its morphological similarities to T. furca (Ehrenberg) F. Gomez within the subgenus Biceratium. Additionally, we reported the widely distributed tropical species T. schroeteri (B. Schroder) F. Gomez from the Colombian Caribbean and compared it to T. digitatus (F. Schutt) F. Gomez within the subgenus Archaeceratium.
Article
Paleontology
Bradley Paine, Linda Armbrecht, Christopher Bolch, Gustaaf M. Hallegraeff
Summary: Predicting phytoplankton responses to climate change in Tasmania's east coast requires a better understanding of longer-term variations from geological records. This study investigated coccolithophores in southeast Australian waters using microscopy and sedimentary ancient DNA techniques, revealing shifts in species dominance and periods of community instability. The findings provide valuable insights into the future of southeast Australian waters and underline the importance of coccolithophores in the marine ecosystem.
MARINE MICROPALEONTOLOGY
(2023)
Article
Biodiversity Conservation
Gustaaf M. M. Hallegraeff, Karine Leblanc
Summary: Antarctic diatom populations, such as Asteromphalus hookeri, A. hyalinus and A. parvulus, exhibit a wide range of hyaline rays. Different combinations of hyaline rays are observed in these diatoms, with 4 + 1 and 5 + 1 rays being the most common. Observations suggest that the separating lines in Asteromphalus play a crucial role in silica cell wall development. The taxonomy of two closely related diatom taxa, A. darwinii and A. hookeri, is discussed and their synonyms are listed.