Article
Engineering, Environmental
Racliffe Weng Seng Lai, Hye-Min Kang, Guang-Jie Zhou, Mana Man Na Yung, Yan Ling He, Alan Man Ching Ng, Xiao-yan Li, Aleksandra B. Djurisic, Jae-Seong Lee, Kenneth Mei Yee Leung
Summary: This study investigated the acute and chronic toxicities of coated zinc oxide nanoparticles on a marine copepod, revealing that surface coatings can affect the ion dissolution and zinc bioaccumulation of particles, different hydrophobicity coatings can influence the toxicity of particles, and the toxicity of coated metal-associated nanoparticles can be predicted by the properties of their surface coatings.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Hye-Min Kang, Jihoon Lee, Yeon-Ju Lee, Yeun Park, Euihyeon Lee, A-Young Shin, Jeonghoon Han, Hyi-Seung Lee, Jong Seok Lee, Kyun-Woo Lee
Summary: This study investigates the toxicity effects of Saxitoxin (STX) on the copepod Tigriopus japonicus and analyzes the transcriptome changes in response to STX exposure. The results demonstrate that the half-maximal lethal concentration of STX for Tigriopus japonicus is 12.35μM, causing rapid mortality at concentrations between 12 and 13μM. Transcriptome analysis reveals significant enrichment of genes involved in the nervous system and gene expression. Network analysis and toxicity pathway analysis identify congenital neurological disorders and oxidative stress pathways as the most significant effects of STX.
Article
Biochemistry & Molecular Biology
Hongju Chen, Jing Wang, Yunyun Zhuang, Wenzhuo Yu, Guangxing Liu
Summary: This study assessed the acute and chronic effects of the toxic dinoflagellate Karenia mikimotoi on the marine benthic copepod Tigriopus japonicus. The results showed that K. mikimotoi reproduction had negative effects on the survival and fitness of the copepods, and these effects were associated with oxidative stress.
Article
Engineering, Marine
Young-Joo Yun, Sung-Ah Kim, Jaehee Kim, Jae-Sung Rhee
Summary: This study analyzed the acute and chronic effects of diuron on the harpacticoid copepod Tigriopus japonicus. The acute exposure experiment showed that 1/10 LC50 diuron significantly reduced the copepod's feeding rate and acetylcholinesterase activity. Chronic exposure revealed adverse multigenerational effects, with the second generation being the most sensitive to diuron.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Jeonghoon Han, Yeun Park, Hyeryeong Jeong, Jun Chul Park
Summary: PM2.5 has significant effects on the life history traits, oxidative stress levels, and detoxification-related genes of Tigriopus japonicus.
MARINE POLLUTION BULLETIN
(2022)
Article
Environmental Sciences
Kanghee Kim, Hakwon Yoon, Jin Soo Choi, Youn-Joo Jung, June-Woo Park
Summary: This study examines the impact of chronic exposure to polystyrene microplastics on the marine copepod Tigriopus japonicus. The size and concentration of the microplastics influenced survival rates, reproductive effects, and oxidative stress response in the copepods. Nano-sized microplastics were not always more toxic than micro-sized microplastics, and oxidative stress played a key role in the toxic effects observed.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2022)
Article
Environmental Sciences
Yeun Park, Jae Gon Park, Hye-Min Kang, Jee-Hyun Jung, Moonkoo Kim, Kyun-Woo Lee
Summary: Proper management of wastewater from underwater hull cleaning equipment is crucial to reduce toxic effects on marine organisms.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Jeonghoon Han, Joon Sang Park, Yeun Park, Jihoon Lee, Hyun Ho Shin, Kyun-Woo Lee
Summary: The study investigated the response of the marine copepod Tigriopus japonicus to the toxic marine dinoflagellate Gymnodinium catenatum, revealing potential impacts on swimming behavior and detoxification mechanisms. Swimming speed and distance were significantly decreased at high concentrations of G. catenatum, while certain detoxification-related genes were upregulated or downregulated in response to G. catenatum exposure, suggesting a potential role as molecular biomarkers.
MARINE POLLUTION BULLETIN
(2021)
Article
Engineering, Environmental
Jiaji Sun, Shiyi Yang, Guang-Jie Zhou, Kai Zhang, Yichun Lu, Qianqian Jin, Paul K. S. Lam, Kenneth M. Y. Leung, Yuhe He
Summary: Surgical masks are widely used during the COVID-19 pandemic, but improper disposal may lead to serious microplastic pollution in coastal marine environments. Research shows that discarded masks could release over 1370 trillion microplastics globally in 2020, with a daily release rate of 396 billion, impacting marine ecosystems through ingestion by marine organisms.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2021)
Article
Immunology
Javad Sahandi, Patrick Sorgeloos, Kam W. Tang, Fanghong Mu, Tatyana Mayor, Wenbing Zhang
Summary: The use of beneficial microbes, or probiotics, is an important management strategy in mariculture. This study investigated the potential of four microbes to suppress pathogens and promote growth in Tigriopus japonicus. Results showed that Debaryomyces hansenii and Bacillus subtilis are promising probiotics for mass copepod culture.
MICROBIAL PATHOGENESIS
(2023)
Article
Environmental Sciences
Kaiming Yang, Siyuan Jing, Yang Liu, Hao Zhou, Yan Liu, Ming Yan, Xianliang Yi, Renyan Liu
Summary: Tire wear particles (TWPs) have been identified as microplastics and may have adverse effects on marine organisms. This study analyzed the chemical composition of TWPs and their leachate, identifying various organic compounds and metals. Toxicity identification evaluation revealed that zinc was the main toxicant in the TWP leachate. Additionally, the release of zinc from TWPs into the aquatic environment was found to be slow.
Article
Marine & Freshwater Biology
Haizheng Hong, Jiaxin Wang, Dalin Shi
Summary: The study revealed that environmentally relevant concentrations of 4-MBC have toxic effects on Tigriopus japonicus, with increasing salinity levels further enhancing its lethal, developmental, and reproductive toxicities. This may be attributed to the higher salinity levels increasing the uptake rate constant and bioconcentration factor of 4-MBC, exacerbating the oxidative stress induced by 4-MBC exposure in T. japonicus.
AQUATIC TOXICOLOGY
(2021)
Article
Environmental Sciences
Shin Yeong Park, Junghyun Lee, Seongjin Hong, Taewoo Kim, Seo Joon Yoon, Changkeun Lee, Bong-Oh Kwon, Wenyou Hu, Tieyu Wang, Jong Seong Khim
Summary: A copepod bioassay was used to evaluate the ecotoxicity of sediments in the Yellow and Bohai seas, and the contribution of individual PAHs to copepod toxicity was assessed. The study found that the Yellow Sea of China had the highest toxicity, followed by the Bohai Sea and Yellow Sea of Korea. Elevated concentrations of PAHs, alkylphenols, and styrene oligomers in the sediments supported the observed toxicities. It was also discovered that a large proportion of unknown toxicants were distributed along the Yellow Sea Large Marine Ecosystem coastline.
MARINE POLLUTION BULLETIN
(2022)
Article
Biology
Matthew J. Powers, James A. Baty, Alexis M. Dinga, James H. Mao, Geoffrey E. Hill
Summary: The shared-pathway hypothesis suggests that ketocarotenoid pigmentation and mitochondrial function are biochemically interconnected. This study exposed Tigriopus californicus copepods to DNP and found that it increased respiration and ketocarotenoid accumulation. The results support the hypothesis and suggest a fundamental connection between ketocarotenoid pigmentation and mitochondrial function.
JOURNAL OF EXPERIMENTAL BIOLOGY
(2022)
Review
Environmental Sciences
Mohammed Junaid Hussain Dowlath, Sathish Kumar Karuppannan, Pamela Sinha, Nihala Sultana Dowlath, Kantha Deivi Arunachalam, B. Ravindran, S. Woong Chang, Phuong Nguyen-Tri, D. Duc Nguyen
Summary: Radiation can be lethal at high doses, but beneficial in controlled doses for medical applications. Plants evolving in radiation conditions have demonstrated the ability to protect organisms against radiation. Studies on plant-based radioprotection have shown promising results and further research is needed to develop effective and safe radioprotectants for clinical use.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Fisheries
Chengyan Han, Hee-Jin Kim, Jae-Seong Lee, Yoshitaka Sakakura, Atsushi Hagiwara
Summary: This study investigates the tolerance, reproduction, behavior, and mitochondria-mediated stress and energy defenses of two species of rotifers, Brachionus plicatilis and Brachionus rotundiformis, following zinc chloride exposure. The results show that higher concentrations of zinc chloride inhibited reproductive processes in B. plicatilis but stimulated sexual reproduction in B. rotundiformis. The two species also exhibited different metabolic patterns and behavioral responses to zinc exposure.
Article
Marine & Freshwater Biology
Haksoo Jeong, Cheolho Yoon, Jae-Seong Lee, Eunjin Byeon
Summary: To examine the role of GST-O2 genes in biotransformation and detoxification in Daphnia magna, the study investigated various responses such as in vivo endpoints, arsenic speciation, enzymatic activities, and gene expression pathways. The results showed that MT fleas had higher sensitivity to arsenic and a lower rate of arsenate reduction, leading to higher accumulation of arsenic concentrations and decreased protection against toxicity. The mRNA expression of other GST genes increased but the enzymatic activity of GST decreased in the MT group compared to the WT group. The study highlights the important role of GST-O2 in arsenic biotransformation and detoxification in D. magna.
AQUATIC TOXICOLOGY
(2023)
Article
Environmental Sciences
Chengge Hu, Fange Yue, Haicong Zhan, Kenneth M. Y. Leung, Hongwei Liu, Weihua Gu, Runqi Zhang, Afeng Chen, Xinming Wang, Zhouqing Xie
Summary: In order to understand the formation process of biogenic and anthropogenic secondary organic aerosols (BSOA and ASOA) in the marine atmosphere under global warming, aerosol samples were collected from the Bering Sea to the western North Pacific over three summers. The results showed that concentrations of isoprene-derived SOA (SOAI) tracers were lowest in 2014, while concentrations of monoterpenes-derived SOA (SOAM) tracers were highest and the aerosols were more aged in that year. Spatially, SOA tracer concentrations were higher over the western North Pacific, mainly coming from terrestrial inputs. The study reveals significant contributions of terrestrial sources to different types of SOA over the western North Pacific.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Fanhao Song, Tingting Li, Fengchang Wu, Kenneth Mei Yee Leung, Jin Hur, Lingfeng Zhou, Yingchen Bai, Xiaoli Zhao, Wei He, Mingqi Ruan
Summary: Biochar-derived dissolved black carbon (DBC) molecules are influenced by the formation temperature and can affect the fate of emerging contaminants like polyvinyl chloride microplastic (MPPVC) in water. The temperature-dependent evolution and MPPVC-interaction of DBC molecules are explored using two-dimensional correlation spectroscopy. The study reveals diverse DBC molecules and fluorophores with increased temperature, accompanied by molecular transformation from saturation/reduction to unsaturation/oxidation. The lignin-like molecules contribute the most to the interaction with MPPVC.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Qi Wang, Yuefei Ruan, Linjie Jin, Lily S. R. Tao, Han Lai, Guifeng Li, Leo W. Y. Yeung, Kenneth M. Y. Leung, Paul K. S. Lam
Summary: The ban/elimination of legacy PFASs has resulted in an increase in the production and use of emerging PFASs. However, the trophodynamics of these emerging PFASs in aquatic food webs are still not well understood. This study investigated the biomagnification potential of legacy and emerging PFASs in seawaters and marine organisms from the South China Sea. Significant trophic magnification was observed for 22 PFASs, including the first reported trophic magnification factors for certain PFASs. The presence of PFASs in seafood from the South China Sea suggests a potential human health risk.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Qi Wang, Yuefei Ruan, Linjie Jin, Brian C. W. Kot, Kenneth Mei Yee Leung, Paul K. S. Lam
Summary: This study conducted target analysis and suspect screening of halogenated flameretardants (HFRs) and their metabolites in the blubber of stranded finless porpoises and Indo-Pacific humpback dolphins in Hong Kong between 2013 and 2020. The concentrations of tetra-/penta-/hexa-bromodiphenyl ethers (tetra-/penta-/hexa-BDEs) in porpoises and dolphins decreased over time, possibly due to the phasing out of these chemicals in China. Positive correlation was found between the concentrations of tetra-BDE and Me-MeO-tetra-BDE, suggesting the potential metabolism of tetra-BDE as a source of Me-MeO-tetra-BDE in marine mammals.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Young Hwan Lee, Min -Sub Kim, Yoseop Lee, Duck-Hyun Kim, Jae-Seong Lee
Summary: Ocean acidification (OA) and nanoplastics (NPs) have a synergistic negative effect on copepod reproduction across generations, potentially posing a significant threat to the sustainability of copepod populations. The intergenerational reproductive impairments observed are associated with differential methylation patterns of specific genes, indicating the role of epigenetic modifications. These findings contribute valuable insight into the intergenerational toxicity and underlying molecular mechanisms of responses to NPs under OA conditions.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Review
Engineering, Environmental
Zhenfei Yan, Chenglian Feng, Kenneth M. Y. Leung, Ying Luo, Jindong Wang, Xiaowei Jin, Fengchang Wu
Summary: This article systematically analyzes the distribution, bioaccumulation, and ecological risks of organophosphate esters (OPEs) in aquatic ecosystems, and determines their interim water quality criteria. The study found that OPEs have geographically specific distribution and are closely related to human activities. The bioaccumulation of OPEs is positively correlated with their hydrophobicity. Through risk quotient and joint probability curve analysis, it was found that some OPEs pose moderate ecological risks. Future studies should focus on the mechanism of biomagnification, derivation of water quality criteria, and more precise assessment of ecological risks for OPEs.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Review
Environmental Sciences
Haksoo Jeong, Eunjin Byeon, Duck-Hyun Kim, Piotr Maszczyk, Jae-Seong Lee
Summary: Heavy metals are discharged into aquatic environments by human activities, resulting in increased pollution. These metals can accumulate in organisms and affect humans through the food chain. They can also interact with other pollutants, causing synergistic or antagonistic effects on aquatic organisms. Therefore, evaluating the effects of complex metal mixtures, pollutants, and environmental factors on aquatic organisms is crucial.
MARINE POLLUTION BULLETIN
(2023)
Article
Engineering, Environmental
Young Hwan Lee, Min-Sub Kim, Yoseop Lee, Chuxin Wang, Seong Chan Yun, Jae-Seong Lee
Summary: This study investigated the effects of interactions between microfibers and freshwater acidification (MFA) on individual Daphnia magna-microbiota interactions. The results showed that MFA interactions can have negative consequences on reproduction, growth, and sex ratio of D. magna, and can induce changes in immunity-and reproduction-related biological processes. The study also revealed that these adverse effects are closely related to changes in microbial communities, suggesting a causal link between D. magna fitness and the microbial community.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Marine & Freshwater Biology
Mohamed Hamed, Christopher J. Martyniuk, Jae-Seong Lee, Huahong Shi, Alaa El-Din H. Sayed
Summary: Marine environments in Egypt are facing a significant issue of microplastic pollution, which potentially harms aquatic organisms. This study evaluated the occurrence, abundance, and distribution of microplastics in marine fishes from the Mediterranean and Red seas in Egypt. The results showed that microplastics were present in the gastrointestinal system of fish at markets but not in muscle or liver. The size of the fish, its diet, and habitat were found to be key factors related to the bioaccumulation of microplastics in fish species. The study concludes that it is crucial to remove plastics from the sea, considering the risks they pose to fisheries and marine ecosystems.
JOURNAL OF SEA RESEARCH
(2023)
Article
Environmental Sciences
Chuxin Wang, Haksoo Jeong, Jin-Sol Lee, Piotr Maszczyk, Alaa El-Din H. Sayed, Un-Ki Hwang, Hyung Sik Kim, Jae-Seong Lee, Eunjin Byeon
Summary: This study demonstrates the combined effect of high concentrations of nanoplastics (NPs) and copper (Cu) on the marine rotifer Brachionus plicatilis, leading to decreased growth rate, reproduction, and lifespan. The interaction of NPs and Cu activates the ERK cell signaling pathway. The impaired MXR function caused by high concentrations of NPs increases the sensitivity of B. plicatilis to Cu, resulting in increased physiological toxicity.
MARINE POLLUTION BULLETIN
(2023)
Article
Ecology
Cherry C. Y. Cheung, Ryan K. L. Leung, Calton S. W. Law, Martin C. F. Cheng, Kevin K. Y. Ho, Priscilla T. Y. Leung, Juan C. Astudillo, Kenneth M. Y. Leung
Summary: Coastal soft-bottom and shallow water habitats in Tolo Harbour and Channel are important nursery grounds for marine fishes, but are facing threats from coastal development and pollution. This study provides ecological information and identifies sites with high conservation priority, aiming to protect the species diversity and fishery resources in the area.
REGIONAL STUDIES IN MARINE SCIENCE
(2023)
Article
Engineering, Environmental
Min-Sub Kim, Young Hwan Lee, Yoseop Lee, Eunjin Byeon, Duck-Hyun Kim, Minghua Wang, Atsushi Hagiwara, Manuel Aranda, Rudolf Shiu Sun Wu, Heum Gi Park, Jae-Seong Lee
Summary: The susceptibility of filter-feeding rotifers to high CO2 conditions and nanoplastic exposure depends on their adaptation history. Rotifers with different adaptation histories showed differences in ingestion and accumulation of nanoplastics, which may be related to microRNA-mediated epigenetic regulation.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Fisheries
Mi-Song Hong, Deok-Seo Yoon, Ji-Su Kim, Heum Gi Park, Jae-Seong Lee, Min-Chul Lee
Summary: We conducted a comprehensive analysis of the effects of increased salinity on Brachionus plicatilis, finding delays in maturation and potential disruptions in the reproductive process. High salinity also impedes growth and alters swimming behavior. Additionally, we discovered distinctive sequences of FABPs in three Brachionus species, contributing to our understanding of their evolutionary positioning.