Regional Studies in Marine Science最新文献

{"title":"A multi-scale gated attention and wavelet transform-based lightweight network for efficient plankton classification","authors":"Liufan Chen ,&nbsp;Zhiyu Zhou ,&nbsp;Yaming Wang","doi":"10.1016/j.rsma.2025.104263","DOIUrl":"10.1016/j.rsma.2025.104263","url":null,"abstract":"<div><div>Plankton monitoring is vital for ocean resource exploration. However, plankton images are numerous and often lack detail, making traditional classification methods prone to low accuracy and inefficiency, while ensemble learning struggles in resource-constrained environments. This study proposes a lightweight plankton image classification method based on GhostNet, named MGLR-WT-CBF-GhostNet (MWC-GhostNet), to enhance classification efficiency and reduce computational overhead. The method introduces the Multi-Scale Gated Long-Range (MGLR) module, which aggregates long-range dependencies using multi-scale asymmetric convolution kernels and learns feature weights via gating mechanisms. This fusion of multi-scale information enhances the model's ability to capture key image features. Additionally, wavelet transform is applied to depthwise convolution in the expansion layer to extract multi-frequency information, improving the model's ability to capture plankton shapes and contours. Class-Balanced Focal Loss is employed to address class imbalance and enhance recognition of hard samples. Experimental results show that MWC-GhostNet achieved an accuracy of 78.43 % and an F1 score of 0.6702 on the Kaggle121 dataset, 98.81 % accuracy and 0.9618 F1 score on the PMID2019 dataset, and 89.13 % accuracy and 0.9128 F1 score on the ZOOSCAN20 dataset. Compared to the baseline models, the proposed method improves accuracy by 1.81 %, 3.03 %, and 3.49 %, and enhances the F1 score by 5.83 %, 4.93 %, and 5.60 %, respectively. The model demonstrates high efficiency and is well-suited for deployment in resource-constrained environments.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"88 ","pages":"Article 104263"},"PeriodicalIF":2.1,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Unequal opportunities and green transition: A study on the mechanism of green total factor productivity differences in China’s regional marine economy","authors":"Caizhi Sun ,&nbsp;Xinyi Li ,&nbsp;Wei Zou ,&nbsp;Yudi Yang","doi":"10.1016/j.rsma.2025.104249","DOIUrl":"10.1016/j.rsma.2025.104249","url":null,"abstract":"<div><div>The inconsistent greening of regional marine economy presents a major challenge to achieving high-quality growth in the marine economy. Drawing from the theory of inequality of opportunity, this paper utilizes the mean logarithmic deviation (MLD) index to analyze disparities in green total factor productivity (GTFP) within the marine economy in China’s coastal ares. To assess the impact of inequality of opportunity factors on regional differences in GTFP, the Shapley value decomposition technique is utilized. And explore the indirect channels. The results show that (1) The GTFP in most regions has shown a certain upward trend. However, significant differences remain among the regions. (2) The overall inequality of opportunity index exhibits a significant rising trend. The index is highest in the southern marine economic circle, next highest in the northern circle, and lowest in the eastern circle. (3) Economic location is the major factor affecting the internal difference in the northern circle. Financial development is an important source of internal differences between the eastern and southern circles. (4) Inequality of opportunity can affect local factor inputs through local policy differences, contributing to differences in GTFP. The key factors influencing the differences within the northern and southern circles are environmental protection and technological innovation, respectively. The factors within the eastern circle exert their influence in a more balanced manner. The study results can provide valuable references for policy makers to formulate policies to coordinate the green development of regional marine economy and realize sustainable development.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"87 ","pages":"Article 104249"},"PeriodicalIF":2.1,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Ecological risk assessment of organochlorine pesticides in coastal sediments: A multi-level approach in the greater bay area","authors":"Jie Wang ,&nbsp;Guiming Bi ,&nbsp;Yingdong Tang ,&nbsp;Yun Shao ,&nbsp;Chao Wei ,&nbsp;Lei Zheng ,&nbsp;Yizhe Wang ,&nbsp;Zhenguang Yan","doi":"10.1016/j.rsma.2025.104256","DOIUrl":"10.1016/j.rsma.2025.104256","url":null,"abstract":"<div><div>The ecological risks posed by persistent organic pollutants are currently a hot research topic in the Guangdong-Hong Kong-Macao Greater Bay Area (GBA). As one of the four largest bay areas globally, and the most economic dynamic region in China, the GBA faces significant environmental challenges, particularly concerning pesticide contamination in coastal sediments. However, studies on the ecological risks of organochlorine pesticides(OCPs) in GBA's coastal sediments remain limited, leading to an insufficient scientific basis for risk management. This study investigate the distribution characteristics of OCPs in coastal sediments in GBA and evaluates their ecological risks employing a multi-level risk assessment approach. The results show that eight OCPs are widely present in GBA's coastal sediments, with concentrations ranging from 0.013 ng/g to 139.56 ng/g. Based on the Risk Quotient (RQ) method, the descending order of ecological risk for these OCPs is as follows: endosulfan, dichlorodiphenyltrichloroethane (DDTs), chlordane, β-hexachlorocyclohexane (HCH), α-HCH, γ-HCH, Hexachlorobenzene (HCB), and mirex. Among them, endosulfan has a high environmental risk, while γ-HCH and DDT present medium environmental risk. Chlordane, β-HCH, and α-HCH exhibit low environmental risk. The semi-probability method evaluation showed that the frequency of endosulfan exceeding predicted no-effect concentration (PNEC) was 91.6 %; while γ-HCH and DDTs had exceedance probability of of 69.4 % and 66.6 %, respectively. The optimized semi-probability method ranked the priority indices of endosulfan, γ-HCH, DDTs, chlordane and β-HCH at 8882.3, 87.2, 77.6, 15.3 and 1.9, respectively. Based on these findings, particular attention should be given to the ecological risks of endosulfan and DDTs in GBA's coastal sediments. This study provides a comprehensive scientific basis for understanding the current status and sources of OCP pollution in the GBA. Moreover, it offers critical insights into the potential ecological risks associated with these contaminants, serving as a scientific foundation for formulating targeted pollution control strategies and environmental management policies.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"88 ","pages":"Article 104256"},"PeriodicalIF":2.1,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Seawater-conditioned cement as a viable substrate for coral larval settlement","authors":"Elizaldy Acebu Maboloc ,&nbsp;Jason Hon-Yin Szeto ,&nbsp;Ken Chue-Ho Yuen ,&nbsp;Shirley Chun-Ching Wong ,&nbsp;Juan Carlos Astudillo ,&nbsp;Lin Cai ,&nbsp;Lucen Hao ,&nbsp;Shipeng Zhang ,&nbsp;Apple Pui-Yi Chui ,&nbsp;James Kar-Hei Fang","doi":"10.1016/j.rsma.2025.104254","DOIUrl":"10.1016/j.rsma.2025.104254","url":null,"abstract":"<div><div>Cement-based materials are commonly used in artificial reefs, but this application encounters a challenge due to their elevated surface pH, which is not ideal for larval recruitment. To address this concern, the present study employed a simple seawater pre-conditioning process to lower the cement surface pH and examined the time required to reach the normal seawater pH range. Four groups of experimental tiles were prepared by mixing ordinary Portland cement with oyster shell powder at mass ratios of 1:0, 1:10, 1:20 and 1:30. Seawater in immediate contact with these tiles displayed initial pH levels of 10.6, 10.0, 9.6 and 9.0, respectively. Within a week of seawater conditioning in darkness, all tested ratios, including pure cement (1:0), displayed a decrease in their impact on seawater pH, which returned to the natural level of 8.1. The conditioned tiles were subsequentially used to induce settlement of coral larvae of <em>Acropora tumida</em> over a three-day period under a day-night cycle. Across all tested ratios, the tiles exhibited statistically similar rates of coral settlement, with an average of 0.53–0.86 larvae observed on each tile (15 mm × 15 mm). These findings suggest that when given sufficient time of pre-conditioning to adjust the surface pH, cement can be a suitable substrate for coral larval recruitment and for implementation in artificial reefs.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"88 ","pages":"Article 104254"},"PeriodicalIF":2.1,"publicationDate":"2025-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Combined effects of nanoplastics and tris (2-chloropropyl) phosphate on photosynthesis and antioxidant activity in Chlorella marina","authors":"Jinping Zhang ,&nbsp;Kecheng Qiu ,&nbsp;Youji Wang ,&nbsp;Xi Chen ,&nbsp;James Kar-Hei Fang ,&nbsp;Hailing Yang ,&nbsp;Yu Zhou ,&nbsp;Xuanjie Zhou ,&nbsp;Menghong Hu ,&nbsp;Wei Huang","doi":"10.1016/j.rsma.2025.104244","DOIUrl":"10.1016/j.rsma.2025.104244","url":null,"abstract":"<div><div>Nanoplastics (NPs) and organophosphorus esters like tris (2-chloropropyl) phosphate (TCPP) are emerging pollutants of global concern in marine ecosystems. However, their combined ecotoxicological effects on primary producers remain poorly understood. We investigated the impacts of 100 nm NPs (10 ³ items·L⁻¹) and TCPP (0.5–50 μg·L⁻¹) on the marine microalga Chlorella (<em>Chlorella marina</em>) during 72-hour exposures. Physiological responses (e.g., chlorophyll <em>a</em>, Fv/Fm) and antioxidant activities (including superoxide dismutase (SOD), catalase (CAT), glutathione (GSH), malondialdehyde (MDA)) were quantified, complemented by scanning electron microscopy (SEM) to observe cellular interactions. We found the combined exposure significantly reduced chlorophyll <em>a</em> content (by 38–52 %) and photosynthetic efficiency (Fv/Fm by 30–45 %) compared to single exposures (<em>p</em> &lt; 0.01). NPs adsorbed onto algal surfaces, exacerbating TCPP-induced oxidative stress: SOD and CAT activities increased 2.3–3.5-fold, while MDA levels rose by 60–80 %, indicating severe membrane damage. The synergistic effects were concentration-dependent, with high-dose TCPP (50 μg·L⁻¹) + NPs causing the most pronounced inhibition. NPs act as carriers to enhance TCPP toxicity in <em>C. marina</em>, disrupting photosynthesis and antioxidant systems. These findings highlight the need to evaluate combined pollutant risks in marine environments, particularly in urbanized coasts where NPs and OPEs co-occur.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"88 ","pages":"Article 104244"},"PeriodicalIF":2.1,"publicationDate":"2025-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 ecotoxicological implications and contamination profile of organochlorine pesticides (OCPs), organophosphorus pesticides (OPPs), and heavy metals, in Tuticorin, Southeast coast of India","authors":"M. Narmatha Sathish,&nbsp;Jamila Patterson","doi":"10.1016/j.rsma.2025.104237","DOIUrl":"10.1016/j.rsma.2025.104237","url":null,"abstract":"<div><div>This research work examined the sources, risks and seasonal variations in the concentrations of organochlorine pesticides (OCPs), organophosphorus pesticides (OPPs), pyrethroids, and heavy metals in the Tuticorin coast, Southeast Coast of India. The concentrations of pesticides and heavy metal residues were measured using GC/MS and AAS. Pesticide residue concentrations in water ranged from 0.001 to 0.067 ng/ml and in sediment from 0.001 to 31.43 ng/g, all falling under the regulatory limits set by WHO and USEPA. The analysis suggested the possibility of local lindane use as the origin for Hexachlorocyclohexane (HCH) residues and the recent introduction of dichloro-diphenyl-trichloroethane (DDT) residue. Metal concentrations were in the order Zn&gt; Fe&gt; Cu &gt; Ni &gt; Mn &gt; Cr &gt; Pb &gt; Cd &gt; Se &gt; Hg for water, and Fe &gt; Mn &gt; Zn&gt; Cr &gt; Cu &gt; Pb &gt; Ni &gt; Cd &gt; Hg &gt; Se for sediment. Metals had higher concentrations in sediments during the post-monsoon season and their concentration decreased with increasing offshore distance. The estuary exhibited severe enrichment of Zn and Hg, while Cd was highly concentrated in the port, reflecting pollution levels ranging from 'unpolluted' to 'moderately polluted'. In the estuary, sediment properties significantly impact the spatial distribution of pollutants, but the correlation is less pronounced in the port and harbor because of varying anthropogenic sources. The results of this study will aid local authorities in safeguarding significant water resources.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"87 ","pages":"Article 104237"},"PeriodicalIF":2.1,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144106923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Biological efficacy of iron for marine macroalgae","authors":"Shuhei Hayashi ,&nbsp;Rimana Islam Papry ,&nbsp;Okviyoandra Akhyar ,&nbsp;Yusuke Kato ,&nbsp;Yuki Nakamura ,&nbsp;Chika Kosugi ,&nbsp;Wong Kuo Hong ,&nbsp;Asami Suzuki Mashio ,&nbsp;Hiroshi Hasegawa","doi":"10.1016/j.rsma.2025.104252","DOIUrl":"10.1016/j.rsma.2025.104252","url":null,"abstract":"<div><div>Herein, a chemical washing method for iron (Fe) plaques on the macroalgal cell surface and the biological effectiveness of Fe for macroalgal growth is reported. A 3-component complex of Ti, citric acid, and EDTA was used as the chemical washing agent. Iron (&lt;0.03–10 µmol), nutrients, organic ligands, and light intensity (1.0–100 µmol m^–2s^–1) were controlled during macroalgal culture tests. The biological effectiveness of Fe plaques and organic Fe complexes for macroalgal growth was analyzed using photosynthetic activity. The results suggest that the higher the stability constant of organic ligands in the medium (28.5 for Fe-DTPA), the more the Fe uptake by macroalgae is inhibited, leading to lower intracellular Fe (2.20 mmol g^–1 for DTPA at Fe:L = 1:500) and decreased photosynthetic activity (0.44 for DTPA at Fe:L = 1:500); a moderate ability to form complexes with Fe (16.5 for Fe-MGDA) promotes Fe uptake. In addition, trace element contents of the macroalgae were monitored throughout the year, and seasonal fluctuations in the sea area was conducted by supplying Fe from autumn in Mashike Bay, Hokkaido, Japan. In the monthly survey of <em>Grateloupia divaricata</em>, whole-cell Fe content fluctuated (37.9–280.1 mg kg^–1), with a tendency to decrease from May to September and increase again in October. The same tendency was confirmed for other trace elements like aluminium (27.2–470.9 mg kg^–1) and manganese (3.1–12.9 mg kg^–1). Furthermore, the demand for nutrients decreased as growth slowed after the peak season in spring, and Fe content increased in October as most of the plants died and the relative biomass declined. In contrast, arsenic (10.0–18.0 mg kg^–1) and cadmium (0.22–0.50 mg kg^–1), which are highly toxic to living organisms, tended to increase gradually from May to October. This study might be a new insight to formulate appropriate measures for environmental conservation in coastal areas.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"88 ","pages":"Article 104252"},"PeriodicalIF":2.1,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 impact of port investment along the 21st Century Maritime Silk Road on regional port network connectivity and its imbalance","authors":"Weishan Lin ,&nbsp;Ling Sun ,&nbsp;Tianshi Wang ,&nbsp;Hui Shang ,&nbsp;Wei Xu","doi":"10.1016/j.rsma.2025.104239","DOIUrl":"10.1016/j.rsma.2025.104239","url":null,"abstract":"<div><div>This study investigates the impact of port investment along the 21st Century Maritime Silk Road on regional port network connectivity and its imbalance, using panel data from 21 key port cities over the period 2014–2023. The analysis reveals a significant positive relationship between port investment and network connectivity, with cargo throughput acting as a partial mediator. While port investment enhances operational efficiency and strengthens trade route resilience, the Gini coefficient analysis indicates substantial imbalances in connectivity, particularly in low-connectivity regions such as Guangzhou, Qinzhou, Lekki Deepwater Port, Abu Dhabi, and Dubai. These imbalances are attributed to economic disparities, insufficient funding, and inadequate infrastructure. The findings suggest that targeted investments in these regions are essential to improve connectivity and promote balanced regional development. This research provides valuable insights for policymakers and stakeholders aiming to optimize port investments, enhance regional trade networks, and ensure sustainable growth along the Maritime Silk Road.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"87 ","pages":"Article 104239"},"PeriodicalIF":2.1,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"In what ways do the toxic effects of chrysene and zinc affect one another? Answers from laboratory bioassays using meiofauna from Jeddah shores, Saudi Arabia","authors":"Nora Ababtain ,&nbsp;Sara Ababtain ,&nbsp;Sahar Ishak ,&nbsp;Samir Ghannem ,&nbsp;Fehmi Boufahja ,&nbsp;Nawal Al-Hoshani ,&nbsp;Octavian Pacioglu ,&nbsp;Amor Hedfi ,&nbsp;Mohamed A.M. Ali ,&nbsp;Walid Elfalleh ,&nbsp;Riadh Badraoui ,&nbsp;Hassan A. Rudayni","doi":"10.1016/j.rsma.2025.104250","DOIUrl":"10.1016/j.rsma.2025.104250","url":null,"abstract":"<div><div>The study examined the effects of chrysene (i.e. 1 and 2 μg.g⁻¹ Dry Weight (DW)) and zinc (i.e. 40 and 80 μg.g⁻¹ DW), in single concentrations and mixtures, on meiobenthic amphipods in Saudi Arabia's Jeddah coastline. The results showed a decrease in the diversity of all benthic taxa after exposure to these substances. The study also found a significant decline in species diversity and abundance, particularly in the amphipods. Multivariate analyses revealed specific shifts in community structure, particularly in assemblages exposed to the highest concentrations of chrysene and zinc. This led to the establishment of a list of sensitive species for chrysene and zinc for future governmental policy purposes. The findings underscored the toxicity of chrysene and zinc in benthic amphipod communities, supported by computational modeling. Chrysene and zinc were detected in amphipod bodies with a clear proportionality with the magnitude of contamination.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"87 ","pages":"Article 104250"},"PeriodicalIF":2.1,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144125061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Are chrysene and manganese ecotoxic to meiobenthic copepods? Assessment through integrated quantitative/taxonomic tools and in silico modeling","authors":"Jumanh S. Alfawzan ,&nbsp;Azzah E. Alotaibi ,&nbsp;Albandari A. Albaqmi ,&nbsp;Sahar Ishak ,&nbsp;Fehmi Boufahja ,&nbsp;Nawal Al-Hoshani ,&nbsp;Octavian Pacioglu ,&nbsp;Mohamed A.M. Ali ,&nbsp;Walid Elfalleh ,&nbsp;Riadh Badraoui ,&nbsp;Hassan A. Rudayni ,&nbsp;Amor Hedfi","doi":"10.1016/j.rsma.2025.104251","DOIUrl":"10.1016/j.rsma.2025.104251","url":null,"abstract":"<div><div>The current study examined the effects of two pollutants, chrysene, and manganese, on the structure and diversity of free-living marine copepods along the Jeddah coast of Saudi Arabia. The experimental design included manganese (hereafter Mn) at two concentrations (Mn1 = 100 μg/g and Mn2 = 200 μg/g) and chrysene (hereafter CHR) at two concentrations (CHR1 = 1 μg/g and CHR2 = 2 μg/g), both individually and in combinations. The findings indicated a reduction in the abundance of all meiobenthic taxa following exposure to these pollutants. Notably, there was a significant decrease in numbers and species diversity among the copepods, with the greatest effects observed after exposure to treatments Mn2, Chr2/Mn2, and Chr1/Mn2. This pattern was confirmed through univariate indices and multivariate analyses. The research resulted in establishing a list of vulnerable species affected by chrysene and/or manganese, which could inform future governmental policy considerations. This kind of information is crucial for mitigating risks to human health. Additionally, the results underscored the harmful effects of chrysene and manganese on meiobenthic copepods, as supported by computational <em>in silico</em> modeling.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"87 ","pages":"Article 104251"},"PeriodicalIF":2.1,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144106924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}