Marine environmental research最新文献

{"title":"Different impact of a severe storm on two gorgonian species","authors":"Olivia Cassetti ,&nbsp;Annalisa Azzola ,&nbsp;Carlo Nike Bianchi ,&nbsp;Carla Morri ,&nbsp;Alice Oprandi ,&nbsp;Monica Montefalcone","doi":"10.1016/j.marenvres.2024.106917","DOIUrl":"10.1016/j.marenvres.2024.106917","url":null,"abstract":"<div><div>Extreme events influence ecosystem dynamics, but their effects on coastal marine habitats are often poorly perceived compared to their terrestrial counterparts. The detailed study of changes in benthic communities related to these phenomena is becoming urgent, due to the increasing intensity and frequency of hurricanes recorded in recent decades. Slow-growing benthic sessile organisms are particularly vulnerable to mechanical impacts, especially the large long-lived species with branched morphology that structure Mediterranean coralligenous assemblages. The present study evaluates the effects of the severe storm occurred in October 2018, and classified as one of most violent that ever struck north-western Mediterranean coasts, on two gorgonian species, the scleralcyonacean <em>Corallium rubrum</em> (with a solid carbonate axial skeleton) and the malacalcyonacean <em>Paramuricea clavata</em> (with a flexible proteinaceous axis). Comparing the cover and density of the two species before and after the severe storm, <em>C. rubrum</em> showed a decrease of more than 50% in one surveyed site. In contrast, <em>P. clavata</em> population did not show a decrease, and exhibited the highest density and cover in the same site, thanks to the high hydrodynamic condition which are favourable for this species. In this study, cover evaluation proved to be more time-efficient than counting colonies, and reduced the risk of errors. The present example highlighted the importance of continuous monitoring, including the assessment of the biological and ecological traits of the species, to provide a complete picture of their populations for conservation planning.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"204 ","pages":"Article 106917"},"PeriodicalIF":3.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142877525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distribution characteristics of Hg and As in the water-SPM system in the Xiaoqing river estuary and coastal","authors":"Feifei Zhang ,&nbsp;Dong Zhang ,&nbsp;Xiaoyue Li ,&nbsp;Huawei Lou ,&nbsp;Hongrui Fu ,&nbsp;Xiaojun Sun ,&nbsp;Peiyan Sun ,&nbsp;Xinping Wang ,&nbsp;Mutai Bao","doi":"10.1016/j.marenvres.2024.106932","DOIUrl":"10.1016/j.marenvres.2024.106932","url":null,"abstract":"<div><div>Water and suspended particulate matter (SPM) were collected from Xiaoqing Estuary and its adjacent waters in August 2022 to study the spatial distribution and risk assessment of Hg and As. The content of Hg in SPM samples ranged from 4.7152 to 446.8678 mg kg⁻¹, and the content of As ranged from 90.1739 to 1147.5500 mg kg⁻¹. The content of Hg in water ranges from 0.0219 to 0.0986 μg L⁻¹, and the content of As ranges from 1.4326 to 11.6750 μg L⁻¹. Xiaoqing River runoff input is the main source of Hg and As. Particulate Hg and As was extremely polluted, water was much less of a risk. It indicated that SPM accumulates more dangerous pollutants (Hg and As). In both water and SPM, it turned out that Hg has a higher risk than As (i.e., CF(Hg) &gt; CF(As), <em>I</em>_geo(Hg) &gt; <em>I</em>_geo(As)). The analysis showed that the environmental factors of water further affected the distribution of Hg or As in water and SPM by influencing biological activity.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"204 ","pages":"Article 106932"},"PeriodicalIF":3.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142915478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatiotemporal variability of air–sea CO2 fluxes in response to El Niño-related marine heatwaves in the tropical Pacific Ocean","authors":"Min Zhang ,&nbsp;Yangyan Cheng ,&nbsp;Haoyu Zhang ,&nbsp;Chuanjiang Huang ,&nbsp;Gang Wang ,&nbsp;Chang Zhao ,&nbsp;Yuanling Zhang ,&nbsp;Qinghua Yang ,&nbsp;Zhengya Song ,&nbsp;Fangli Qiao","doi":"10.1016/j.marenvres.2025.106949","DOIUrl":"10.1016/j.marenvres.2025.106949","url":null,"abstract":"<div><div>The tropical Pacific is the largest oceanic source of carbon dioxide (CO₂) emissions, where persistent marine heatwaves (MHWs) frequently occur. During persistent MHW events which are associated with strong El Niño events, CO₂ outgassing is notably reduced, however, its detailed spatiotemporal response to MHWs has not been fully characterized. In this study, we showed a high degree of consistency between CO₂ source regions in the central and eastern tropical Pacific Ocean and the occurrence regions with average annual MHW days exceeding 45 days (co-occurring area covers 80% of the area where MHWs occur). The spatiotemporal variability of the air-sea CO₂ flux on interannual and longer timescales can be reconstructed from annual MHW days and occurrence frequency, respectively, in the central and eastern Pacific Ocean of the co-occurring region. In this region, El Niño-related MHWs reduce the air-sea CO₂ flux density up to 0.4–0.8 molC/m²/yr per 100 MHW days, corresponding to a reduction of CO₂ emissions by approximately 0.1 PgC per 100 MHW days. This is a 10%–40% reduction in CO₂ emissions during MHW periods, with the strongest impact (30%–40% CO₂ emission reduction) in the equatorial Pacific (5°S-5°N) of the central and eastern Pacific Ocean. In contrast, air–sea CO₂ flux variations in coastal eastern upwelling region of the co-occurring region are mainly subjected to seasonal mixed layer variations, and thus not notably affected by El Niño-related MHWs on interannual timescales. By establishing the reproducibility between MHWs and air–sea CO₂ flux variations, our results pave a way for detailed future spatiotemporal evolutions of MHW-induced changes in air–sea CO₂ flux in the tropical Pacific Ocean.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"204 ","pages":"Article 106949"},"PeriodicalIF":3.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142971566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular response to CO2-driven ocean acidification in the larvae of the sea urchin Hemicentrotus pulcherrimus: Evidence from comparative transcriptome analyses","authors":"Wenlu Yin ,&nbsp;Wenhong Mai ,&nbsp;Wanbin Hu,&nbsp;Yingying Li,&nbsp;Dongyao Cui,&nbsp;Jingxian Sun,&nbsp;Jiaxiang Li,&nbsp;Yaoyao Zhan,&nbsp;Yaqing Chang","doi":"10.1016/j.marenvres.2025.106951","DOIUrl":"10.1016/j.marenvres.2025.106951","url":null,"abstract":"<div><div>In order to explore the impact of CO₂-driven ocean acidification (OA) on gene expression of sea urchins, gametes of <em>Hemicentrotus pulcherrimus</em> were fertilized and developed to the four-armed larvae in either seawater at current pH levels (pH_NBS = 7.98) or in three laboratory-controlled OA conditions (ΔpH_NBS = −0.3, −0.4, −0.5 units) based on the projections of the Intergovernmental Panel on Climate Change (IPCC) for 2100. Four-armed larval specimens were collected, and comparative transcriptome analysis was then performed. The results showed that 58 differentially expressed genes (DEGs) were identified in OA-treated groups as compared to the control. Moreover, more transition and transversion SNPs were observed in OA-treated groups than those in the control indicating a potential occurrence of adaption to OA in <em>H. pulcherrimus</em> larvae. Six candidate DEGs shared among OA-treated groups were identified as potential biomarkers correlated with low pH tolerance, mainly enriched in nine pathways associated with Notch signaling, dorso-ventral axis formation, oxidative phosphorylation, lysine degradation, valine, leucine and isoleucine degradation, lysosome, cell adhesion molecules, glutathione metabolism and PPAR signaling pathway. These results will not only enrich our knowledge of the impacts of OA on sea urchin larvae from the aspect of gene expression, provide a better understanding on larval forms coping with OA, but also offer more clues and biomarkers for developing protection or management strategies for sea urchins under near-future OA conditions.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"204 ","pages":"Article 106951"},"PeriodicalIF":3.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143007974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The importance of upwelling conditions as drivers of feeding behavior and thermal tolerance in a prominent intertidal fish","authors":"Melissa Fernández ,&nbsp;Cristian Duarte ,&nbsp;Marcela Aldana ,&nbsp;Joaquín Delgado-Rioseco ,&nbsp;Francisca Blanco-Herrera ,&nbsp;Oscar Varas ,&nbsp;Pedro A. Quijón ,&nbsp;Diego Quintanilla-Ahumada ,&nbsp;M Roberto García-Huidobro ,&nbsp;José Pulgar","doi":"10.1016/j.marenvres.2024.106896","DOIUrl":"10.1016/j.marenvres.2024.106896","url":null,"abstract":"<div><div>Upwelling, as a large oceanographic phenomenon, increases coastal productivity and influences all levels of biological complexity. Despite decades of research on it, much remains to be understood about the impact of upwelling on the feeding behavior and thermal tolerance of important groups such as fish. Hence, our aim was to investigate how upwelling conditions modify the feeding behavior and thermal tolerance of a prominent intertidal fish, <em>Girella laevifrons</em>. We collected purple mussels (<em>Perumytilus purpuratus</em>) from upwelling (U) and downwelling sites (DU) in central Chile, and used them as prey in feeding trials and measuring the concentration of organic matter and proteins in their tissues. We assessed fish consumption rates and growth in fish collected from the same U and DU sites, feeding on either U or DU mussels. Lastly, we assessed the thermal tolerance of U and DU fish fed with the aforementioned U vs DU mussels. We found that U mussels held higher concentrations of organic matter and proteins compared to their DU counterparts. U mussels were also selected and consumed in larger amounts than DU mussels, although the origin of the fish also influenced consumption rates. Thermal tolerance assays revealed that U fish exhibited higher maximum performance (<strong>Max.pf</strong>) and critical thermal maxima (<strong>Ct</strong>_{<strong>max</strong>}) and lower sensitivity to temperature changes (as measured by <strong>Q</strong>_{<strong>10</strong>}), compared to DU fish. Altogether, these results point to a strong influence of upwelling on the quality of organisms’ tissues, indirectly altering key aspects of fish feeding behavior and thermal tolerance. These findings also contribute to understanding the physiological adjustments organisms make in productive upwelling systems, and how they may change in the future with ongoing climate events.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"204 ","pages":"Article 106896"},"PeriodicalIF":3.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142794428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-term warming and acidification interaction drives plastic acclimation in the diatom Pseudo-nitzschia multiseries","authors":"Yanmin Sun ,&nbsp;Fan Yang ,&nbsp;Ran Duan ,&nbsp;Dong Xu ,&nbsp;Yanan Zhang ,&nbsp;Chengwei Liang ,&nbsp;Zhuonan Wang ,&nbsp;Xintong Huang ,&nbsp;Bingkun Wang ,&nbsp;Yapeng Wang ,&nbsp;Haoming Sun ,&nbsp;Naihao Ye ,&nbsp;Fei-Xue Fu ,&nbsp;Fang Li","doi":"10.1016/j.marenvres.2024.106901","DOIUrl":"10.1016/j.marenvres.2024.106901","url":null,"abstract":"<div><div>Ocean warming (OW) and acidification (OA) are expected to interactively impact key phytoplankton groups such as diatoms, but the underlying mechanisms, particularly under long-term acclimation, remain poorly understood. In this study, we investigated the responses of the toxic diatom <em>Pseudo-nitzschia multiseries</em> to combined changes in temperature (20 °C and 30 °C) and CO₂ concentration (<em>p</em>CO₂ 400 μatm and 1000 μatm) using a multi-omics approach over an acclimation period of at least 251 generations. Physiological data suggest that elevated temperature, either alone or in combination with CO₂, reduced the net photosynthesis and nitrate uptake rate, thus inhibiting <em>P. multiseries</em> growth. Conversely, elevated CO₂ alone stimulated <em>P. multiseries</em> growth. Comparative genome analysis revealed the phenotypic plasticity in response to temperature and <em>p</em>CO₂ variations, even after more than 251 generations acclimation period. Temperature was identified as the dominant environmental factor, showing stronger effects than CO₂. Transcriptomic profiles indicated that genes involved in stress- and intracellular homeostasis such as <em>Hsps</em>, ubiquitination process and antioxidant defense were mostly down-regulated under long-term warming acclimation. This study demonstrates that <em>P</em>.<em>multiseries</em> responds similarly to both short-term and long-term experimental selection, suggesting that short-term experiments can be used to predict long-term responses.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"204 ","pages":"Article 106901"},"PeriodicalIF":3.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142822232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatiotemporal distribution of chlorophyll-a concentration in the south China sea and its possible environmental regulation mechanisms","authors":"Xijun Wei ,&nbsp;Hui Zhao","doi":"10.1016/j.marenvres.2024.106902","DOIUrl":"10.1016/j.marenvres.2024.106902","url":null,"abstract":"<div><div>In this paper, the spatial and temporal distribution of chlorophyll-<em>a</em> (Chl-<em>a</em>) concentration in the South China Sea (SCS) and its major environmental regulator mechanisms were studied by using satellite remote sensing data sea surface temperature (SST), sea surface wind (SSW), and aerosol optical depth (AOD) spanning from January 2000 to December 2022. The results show that Chl-<em>a</em> in the SCS exhibit notable spatio-temporal variations: they peak in winter (∼0.234 mg m⁻³) and autumn (∼0.156 mg m⁻³), and decline in spring (∼0.144 mg m⁻³) and summer (∼0.136 mg m⁻³). Spatially, Chl-<em>a</em> near the coast and in upwelling areas are generally higher than those in offshore areas. A monthly average time series correlation analysis across the entire SCS shows that Chl-<em>a</em> significantly correlate with SST (R = −0.78, P &lt; 0.01) and SSW (R = 0.78, P &lt; 0.01), and moderately correlate with AOD (R = 0.29, P &lt; 0.01). The regulator of environmental factors also shows seasonal differences: during the winter monsoon period, Chl-<em>a</em> has the highest partial correlation with SSW (R = 0.73, P &lt; 0.01), followed by SST (R = −0.55, P &lt; 0.01), and no significant partial correlation with AOD (R = 0.14, P &gt; 0.05); during the summer monsoon period, Chl-<em>a</em> has the highest partial correlation with SST (R = −0.63, P &lt; 0.01), followed by AOD (R = 0.40, P &lt; 0.01), and no significant partial correlation with SSW (R = 0.12, P &gt; 0.05). A comprehensive analysis indicates that the mixing and upwelling processes regulated by the winter monsoon and SST exert a greater influence on nutrient variations. The enhanced mixing caused by the winter monsoon and the cold environment promote the growth of phytoplankton, leading to higher Chl-<em>a</em> concentrations in winter compared to other seasons. In contrast, the increased temperature in the summer monsoon period significantly weakens the mixing effect of wind speed and nutrients influx from deep layers to surface layers. Consequently, the external nutrient sourced from aerosol becomes crucial in determining Chl-<em>a</em> distribution, especially in oligotrophic regions near the southern SCS and the basin. However, in regions where other nutrient sources significantly contribute, such as the coastal areas influenced by seasonal upwelling, the contribution of aerosols is negligible.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"204 ","pages":"Article 106902"},"PeriodicalIF":3.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142822238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Proteinaceous corals reveal heterogeneity in shifting Southern California oceanographic regimes.","authors":"Branwen Williams, Sarah Barnes, Mary Knaak, Ellen R M Druffel, Matt McCarthy, Genevieve Pugsley, Natasha Vokhshoori, Jerome Fiechter, Peter Etnoyer, Chris Caldow","doi":"10.1016/j.marenvres.2025.106954","DOIUrl":"10.1016/j.marenvres.2025.106954","url":null,"abstract":"<p><p>The Southern California Bight is an ecologically important region for many local and migratory fauna. We combine bulk and compound-specific amino acid stable isotope measurements in the skeletons of proteinaceous octocorals with new regional ocean modeling system model output to explore biogeochemical changes at two locations within the Bight - Santa Cruz Basin and Santa Barbara Channel. Separated by the Channel Islands, these sites display distinct oceanographic regimes. Corals from the southeastern Santa Cruz Basin display lower bulk δ¹³C and higher bulk δ¹⁵N values than those in the northern Santa Barbara Channel. Amino acid isotope analyses indicate that the higher δ¹⁵N values in Santa Cruz Basin reflect both higher δ¹⁵N of baseline primary production and nitrate and higher trophic positions of the sinking particles that comprise the coral's diet. These findings suggest low nitrate concentrations, more complete nitrate utilization, lower productivity, and a longer planktonic food web. A 50-year time series of coral skeleton δ¹⁵N bulk values increases with time, consistent with sediment cores that capture an increase in the δ¹⁵N_NO3 advected into the central Bight. In contrast, the Santa Barbara Channel corals display decadal-scale fluctuations, likely driven by interdecadal fluctuations in upwelling and nitrate supply. These findings agree with physical-biogeochemical model simulations showing greater sensitivity of upwelled surface nitrate concentrations to ocean climate variability in the Santa Barbara Channel. The importance of nutrient availability on ecosystem structure is emphasized using compound specific amino acid analysis, in a way that may be overlooked in bulk isotope palaeoceanographic records.</p>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"204 ","pages":"106954"},"PeriodicalIF":3.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143059250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to \"Physiological energetics of selectively bred oysters (Crassostrea hongkongensis) under marine heatwaves\" [Mar. Environ. Res. 204 (2025) 106871].","authors":"Xiaoyan Jiang, Xingzhi Zhang, Junliang Guan, Pingping He, Pingyuan Wei, Li Zhang, Jinxia Peng, Liqiang Zhao","doi":"10.1016/j.marenvres.2024.106903","DOIUrl":"10.1016/j.marenvres.2024.106903","url":null,"abstract":"","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":" ","pages":"106903"},"PeriodicalIF":3.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142837211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of microorganisms, temperature and irradiation on the stability of dissolved okadaic acid and dinophysistoxin-1 in seawater.","authors":"Jiangbing Qiu, Chao Yin, Aifeng Li, Yongmeng Yang, Guixiang Wang, Dongyue Li","doi":"10.1016/j.marenvres.2025.106969","DOIUrl":"10.1016/j.marenvres.2025.106969","url":null,"abstract":"<p><p>Diarrhetic shellfish toxins (DSTs) are widespread in marine environments, posing potential threats to marine ecosystems, shellfish aquaculture, and human health. Despite their prevalence, knowledge of the stability of dissolved DSTs in seawater is still limited. This study aimed to investigate the effects of bacteria, temperature, and irradiation on the stability of dissolved okadaic acid (OA) and dinophysistoxin-1 (DTX1) in seawater. Results indicated that bacteria did not contribute to the biodegradation of OA and DTX1, while their growth was inhibited by the toxins over the 7-day experiment. During a 28-day period without irradiation at 4 °C, 20 °C, and 37 °C, no degradation of OA was observed, whereas significant degradation of DTX1 occurred, with concentrations dropping to 58%-78% of the initial concentration at the end of the experiment. Under xenon lamp irradiation at 1000 W, the concentrations of DTX1 decreased by 15%-19% in seawater after 160 min, while the concentrations of OA showed minimal change. Conversely, both OA and DTX1 underwent significant degradation under mercury lamp irradiation with an irradiation intensity-dependent pattern. Additionally, the degradation rates of OA and DTX1 increased with higher concentrations of dissolved organic matter in the range of 1.2-15 mg C L⁻¹. This study enhances the understanding of DST stability in seawater under varying temperature and light conditions, highlighting the complexities involved in their degradation processes. The results of this study found that ultraviolet is an important driving environmental factor for OA and DTX1 degradation in the natural marine environment. In case of harmful algal blooms with associated phycotoxins, ultraviolet irradiation can be used as a removal method for OA and DTX1.</p>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"204 ","pages":"106969"},"PeriodicalIF":3.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143059249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}