Regional Studies in Marine Science最新文献

{"title":"Bioeconomic analysis of Egyptian mediterranean and red sea fisheries: Implications for sustainable management","authors":"Marwa Mamdouh-Lotfy ,&nbsp;Mohamed Samy-Kamal ,&nbsp;Jongoh Nam ,&nbsp;Seonghyun Sim","doi":"10.1016/j.rsma.2025.104277","DOIUrl":"10.1016/j.rsma.2025.104277","url":null,"abstract":"<div><div>Egyptian marine fisheries face the same challenges as most of the world’s fisheries including overfishing. This research provides an assessment of the stock and economic situations of marine fisheries in both the Mediterranean and Red Seas of Egypt. Key objectives are to assess the biological status of these fisheries, evaluate suitable surplus production models, and estimate Maximum Sustainable Yield (MSY) with its corresponding effort (E_MSY). Additionally, the study determines economic benchmarks like Maximum Economic Yield (MEY) and Open Access Equilibrium (OAE), and proposes management recommendations based on these bioeconomic analyses. The analysis employs catch and effort data to determine biological parameters using surplus production models. The Clarke-Yoshimoto-Pooley (CY&amp;P) model was selected to estimate MSY and fishing effort in MSY (E_MSY), as it was considered the most suitable for this purpose; a bioeconomic model based on CY&amp;P was also developed. The CY&amp;P model estimations for 2016 show that actual fishing effort in the Mediterranean Sea (498,423 horsepower (HP)) was more than double the target E_MSY (243,768 HP). Similarly, in the Red Sea, effort (296,391 HP) exceeded its E_MSY (175,947 HP), indicating severe overexploitation and stock depletion in both regions. The study underscores the critical need for substantial fishing effort reductions—around 51.1 % in the Mediterranean and 40.6 % in the Red Sea—to reach E_MSY targets. Primary management recommendations derived from this study focus on implementing stringent effort controls, gear-specific measures, and improved fishery monitoring to facilitate stock recovery and optimize economic benefits.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104277"},"PeriodicalIF":2.1,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144221546","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":"Spatial changes of macrobenthic polychaete assemblages from the southern Mexican Pacific shelf: diversity patterns and feeding guilds composition","authors":"Pablo Hernández-Alcántara ,&nbsp;Francisco F. Velasco-López ,&nbsp;Benjamín Quiroz-Martínez ,&nbsp;Vivianne Solís-Weiss ,&nbsp;León Felipe Álvarez-Sánchez","doi":"10.1016/j.rsma.2025.104275","DOIUrl":"10.1016/j.rsma.2025.104275","url":null,"abstract":"<div><div>Polychaetes account for most of the macrobenthic species found in soft bottoms, but in the Tropical Eastern Pacific, and particularly in the southern Mexican Pacific shelf, their composition and diversity patterns are very poorly known. So, the aim of this study was to analyze how the polychaetes are distributed in relation to the environmental variables across the continental shelf in that area, and to classify their assemblages as defined by the species present and their variations. For this purpose, we examined 3741 individuals of 82 species, collected there at 38 stations between 42–109 m depth. Using univariate and multivariate statistical approaches, we found that depth was the main structuring variable, to separate the faunal assemblages, with the sediment texture as secondary, but also statistically important. The distribution of the assemblages and the largest changes in diversity and variety of feeding modes were highly linked to shelf levels. The assemblage <em>Paraprionospio pinnata</em>-<em>Magelona marianae</em> (PpMm) was defined for the inner shelf, with the highest diversity and dominated by surface deposit feeder species. In the middle and outer shelves, the diversity values decreased, and the motile carnivore species gradually replaced the detritivores, determining the presence of the assemblages <em>Linopherus kristiani</em>-<em>P. pinnata</em> (PpLk) and <em>L. kristiani</em> (Lk), respectively. The sandy bottoms, well oxygenated and with low concentrations of nutrients from the inner shelf, correlated well with the rich assemblage PpMm, while in the deeper zones with muddy bottoms, higher in nutrients and poorly oxygenated, the less diverse assemblages PpLk and Lk occurred. Knowing how the polychaete assemblages change with depth and sediment composition in this poorly explored marine region, can be useful to develop future research, by examining their occurrence on distinct habitats and to monitor long-term faunal and environmental changes.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104275"},"PeriodicalIF":2.1,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240138","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":"A baseline assessment of the occurrence, characterization, source, and risk impact of petroleum-related hydrocarbons in sediments along the southeast shoreline of Vancouver Island and Southern Gulf Islands in British Columbia, Canada","authors":"Zeyu Yang,&nbsp;Keval Shah,&nbsp;Claire Courtemanche,&nbsp;Sonia Laforest,&nbsp;Bruce P. Hollebone,&nbsp;Antoine Rolland,&nbsp;Pascal Hebert,&nbsp;Patrick Lambert,&nbsp;Michael Goldthorp,&nbsp;Yuan Yao,&nbsp;Michael J.J. Murphy,&nbsp;Chun Yang,&nbsp;Diane Dey,&nbsp;Vanessa Beaulac","doi":"10.1016/j.rsma.2025.104270","DOIUrl":"10.1016/j.rsma.2025.104270","url":null,"abstract":"<div><div>Total petroleum hydrocarbons (TPH), <em>n</em>-alkanes, petroleum biomarkers, and polycyclic aromatic hydrocarbons (PAHs) were analyzed in 63 intertidal zone sediments from the southeast shoreline of Vancouver Island and the nearby Southern Gulf Islands, British Columbia (BC), Canada, using gas chromatography coupled with a flame ionization detector and mass spectrometry. All sites had TPH levels much lower than the Canadian Council of Ministers of the Environment thresholds for fine- and coarse-grained soils in agricultural and natural areas. Terrestrial plants were the main source of <em>n</em>-alkanes, though petrogenic <em>n</em>-alkanes were found in 13 % of 63 samples, as indicated by the carbon preference index (CPI) and related characteristics. PAHs primarily originated from pyrogenic input, with some locations showing mixed petrogenic and pyrogenic inputs based on analyzing diagnostic ratios, like pyrogenic index and certain isomer ratios. Petroleum contamination was evident at sites with intensive human activities or oil spill history, such as Cowichan Bay, Octopus Point, Medicine Beach, Fulford Harbor, East Portland, Separation Point, Maple Bay, and Aldridge Point, marked by significant levels of petroleum biomarkers, petrogenic <em>n</em>-alkanes, and PAHs. While all PAHs pose minimal risk to benthic organisms, compounds like naphthalene, 2-methyl naphthalene, and certain 3–6 ring PAHs could potentially affect them at certain sites from Cowichan Bay, East Portland, Separation Point, Medicine Beach, and Maple Bay.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104270"},"PeriodicalIF":2.1,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144205079","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":"Species compositions and annual dynamics of Scorpaenid fish eggs in tropical seagrass beds: Integrating DNA barcoding and morphological analysis","authors":"Hong Wang ,&nbsp;Wentong Xia ,&nbsp;Zhongbo Miao ,&nbsp;Songguang Xie","doi":"10.1016/j.rsma.2025.104258","DOIUrl":"10.1016/j.rsma.2025.104258","url":null,"abstract":"<div><h3>Highlights</h3><div>Fish eggs generally lack species-specific morphological characteristics, complicating taxonomic identification. Tropical coastal seagrass beds, recognized as critical nursery grounds for fish, have been overlooked as spawning habitats.</div></div><div><h3>Methodology</h3><div>From June 2021 to May 2022, monthly nocturnal high-tide sampling during spring tides was conducted in seagrass beds in Gaolong Bay, Wenchang, Hainan Island, China, using large plankton nets. DNA barcoding targeting the cytochrome c oxidase subunit I (COI) gene combined with morphological grouping and stratified sampling was employed to determine species composition and quantify spatiotemporal dynamics of the fish eggs.</div></div><div><h3>Results</h3><div>Of 2276 fish eggs sequenced, 549 were identified as Scorpaenidae, encompassing 9 species across 5 genera. <em>Parascorpaena</em> (3 species) dominated the family numerically (51.0 %). Scorpaenid eggs exhibited elliptical/spherical shapes (diameter: 0.67–1.10 mm), smooth chorion, absent oil globules, and narrow perivitelline space. Eggs occurred year-round (except January and October), with peak richness during March and August and the highest density in May. Most species exhibited temporal overlap.</div></div><div><h3>Conclusion</h3><div>Although species-level morphological identification of fish eggs is limited, family-level morphological grouping combined with stratified DNA barcoding enables efficient community analysis. Integrating molecular and morphological methods facilitates large-scale egg identification, providing critical insights for evaluating tropical seagrass beds as fish spawning grounds.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"88 ","pages":"Article 104258"},"PeriodicalIF":2.1,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168880","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":"Trophic guild structure, feeding overlap and diet-associated anthropogenic particles in the fishes of Manori Creek, Mumbai, India","authors":"Rajarshi Bandyopadhyay ,&nbsp;Shashi Bhushan ,&nbsp;K.K. Ramteke ,&nbsp;Shobha Rawat ,&nbsp;Abhilash Wodeyar K. ,&nbsp;Abhijit Mallik ,&nbsp;V. Vidhya","doi":"10.1016/j.rsma.2025.104272","DOIUrl":"10.1016/j.rsma.2025.104272","url":null,"abstract":"<div><div>The study examined the food and feeding habits and the presence of anthropogenic particles of 38 fish species from 25 families in Manori Creek, Mumbai, India, over an eight-month period. Gut contents of 632 individuals, primarily juveniles, were analysed. The diet breadth (Bi) varied from 0.25 to 0.92, indicating generalist tendencies. Six ecological guilds were identified, with Marine Estuarine Opportunists (MMO) being the most significant. Eleven trophic guilds were formed using SIMPROF test and cluster dendrogram, with <em>Acetes</em> feeders (14 species) being the largest guild. <em>Acetes</em> spp. was the most important prey, present in 68.4 % of species. Significant diet overlap occurred within guilds (α ≥ 0.6) but not between different guilds. Anthropogenic particles in fish gut highlighted significant pollution levels. 52.6 % of the studied species belonging to eight trophic guilds were found to have the particles in their gut, ranging from 65.6 % of <em>Coilia dussumieri</em> to 6.52 % of <em>Johnius belangerii.</em> The research will contribute to a comprehensive understanding of the food web, trophic dynamics, and their relationship with the ingestion of anthropogenic particles, thereby supporting the management and conservation of this important coastal ecosystem.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104272"},"PeriodicalIF":2.1,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189404","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":"Elucidating the role of environmental conditions and nutrients in shaping phytoplankton structures in the Cox’s Bazar coast, Bay of Bengal","authors":"Mohammed Ashraful Azam Khan,&nbsp;Amena Akter Alpona,&nbsp;Sarif Ullah","doi":"10.1016/j.rsma.2025.104265","DOIUrl":"10.1016/j.rsma.2025.104265","url":null,"abstract":"<div><div>Phytoplankton communities play a crucial role in marine ecosystems, serving as primary producers and indicators of environmental changes. This study investigates the spatial and temporal variations in phytoplankton structure along the Cox’s Bazar coast of the Bay of Bengal, Bangladesh, in relation to environmental parameters (Temperature, Salinity, pH, DO, Water Current) and nutrient dynamics (NO₂-N, NO₃-N, NH₄-N, PO₄-P, SiO₄-Si). Water samples from 12 stations across Bakhkhali, Moheshkhali, Nunier Chara, and Sonadia Island were analyzed to assess phytoplankton diversity and abundance. A total of 34 phytoplankton genera from four major classes—Bacillariophyceae, Dinophyceae, Cyanophyceae, and Chlorophyceae—were identified, with Bacillariophyceae being the most dominant. Canonical Correspondence Analysis (CCA) revealed that temperature and salinity were the primary drivers of phytoplankton distribution, while ammonium, phosphate, and dissolved oxygen played secondary roles. Seasonal trends indicated that Chlorophyceae preferred higher temperatures and dynamic water conditions, whereas Bacillariophyceae thrived in low salinity environments. The dominance of Thalassiosira, Skeletonema, and Chaetoceros at Moheshkhali suggested high primary productivity, while Pseudo-nitzschia abundance at Nunier Chara raised concerns about potential harmful algal blooms. The findings underscore the ecological significance of phytoplankton in coastal waters and provide valuable insights for sustainable fisheries management and marine ecosystem conservation.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"88 ","pages":"Article 104265"},"PeriodicalIF":2.1,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144169304","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":"Environmental impact of heavy metal contamination in coastal sediments and saltmarshes of Palk Bay and Gulf of Mannar, Southeast India","authors":"D. Smriti,&nbsp;K.R. Priyanka,&nbsp;R. Rajaram","doi":"10.1016/j.rsma.2025.104253","DOIUrl":"10.1016/j.rsma.2025.104253","url":null,"abstract":"<div><div>This current study investigates the bioaccumulation of heavy metals in salt marsh plants from Palk Bay and the Gulf of Mannar, Southeast India, emphasizing seasonal variations (Monsoon and Summer) in metal uptake. Eleven plant species, including <em>A. halimus</em>, <em>S. littoreus</em>, and <em>S. maritima</em>, were analysed across two seasons for cadmium (Cd), chromium (Cr), copper (Cu), lead (Pb), and zinc (Zn) concentrations in plant tissues and sediments. Results indicate higher metal accumulation during monsoon, with substantial uptake of Cu, Zn, and Cr by <em>A. halimus</em> and <em>S. littoreus</em>. Igeo standards for sediments suggests negligible Cd contamination, low Cr and Cu contamination, and moderate Zn contamination during summer. The investigation concluded that the heavy metal contamination in sediments was noted as, Cd &gt; Pb &gt; Cr &gt; Cu &gt; Zn for monsoon; Cr &gt; Cu &gt; Zn &gt; Pb &gt; Cd for summer seasons. The Contamination Degree (CD) and Potential Ecological Risk (PER) indices identified stations S5, S8, and S9 as areas of concern, especially in summer. This study highlights salt marsh plants as effective bioindicators of heavy metal pollution in coastal ecosystems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104253"},"PeriodicalIF":2.1,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195567","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 and energy sector impacts of bisphenol compounds: A case study on their distribution in Bohai Bay seawater","authors":"Siao Zhang ,&nbsp;Siyu Yi ,&nbsp;Zeng Liu ,&nbsp;Sen Wang ,&nbsp;Xi He ,&nbsp;Lifeng Shi ,&nbsp;Yukuo Liu ,&nbsp;Hao Wang","doi":"10.1016/j.rsma.2025.104268","DOIUrl":"10.1016/j.rsma.2025.104268","url":null,"abstract":"<div><div>This study investigates the dispersion of bisphenol analogues (BPs) in the waters of Bohai Bay and evaluates their ecological danger. A comprehensive analysis shows that there are seven different types of BPs, including bisphenol A (BPA), bisphenol F (BPF), bisphenol AF (BPAF) and bisphenol S (BPS), in water samples collected from Bohai Bay between 2020 and 2024. Although there are regulations in place for the manufacturing and use of BPA in China, it remains prevalent. The investigation demonstrated that the concentrations of BPA in Bohai Bay varied between 51.48 and 220.61 ng/L. The mean value was 136.84 ng/L. The levels of BPF and BPS were the second highest, although still much lower than those of BPA. The ecological danger in the waters of Bohai Bay was assessed using the Risk Quotient (RQ) approach. The findings revealed that the RQ value of BPs was less than 0.1, suggesting a low ecological risk. However, the yearly average levels of BPs showed a rising pattern, indicating the collective impact of industrial activity, agricultural output, and municipal wastewater discharges. Hence, it is advisable to devise and execute efficient strategies to regulate pollution, aiming to diminish the release and ecological buildup of BPs in Bohai Bay. The aim is to protect the environment and human health.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104268"},"PeriodicalIF":2.1,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177525","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 shift from resource utilization to optimal allocation of resources, capital, and labor: Analyzing China’s coastal fisheries economies","authors":"Ruijing Xu ,&nbsp;Sufyan Ullah Khan ,&nbsp;Yixiao Wang ,&nbsp;Yao Zhang","doi":"10.1016/j.rsma.2025.104269","DOIUrl":"10.1016/j.rsma.2025.104269","url":null,"abstract":"<div><div>Exploring the impact of fishery resources on the fishery economy in China’s coastal areas through the “drag effect” of fishery resources is essential for promoting sustainable utilization, improving fishery quality, and addressing regional disparities in fishery development. Using panel data from 11 coastal provinces from 2007 to 2022, this study employs the time-varying CRITIC-entropy method to measure the fishery resource utilization index, empirically investigates the “drag effect” of fishery resources, and analyzes spatial effects using a spatial econometric model. The findings reveal that fishery resource input (R) significantly promotes the fishery economy and injects impetus for the sustained growth of the fishery economy; labor input (L) significantly constrains the fishery economy, probably due to excess inputs, which in turn constrains the production efficiency; and capital input (K) does not significantly affect the fishery economy, so it is necessary to focus on the balanced inputs of each factor. The “drag effect” of fishery resources varies significantly among provinces, categorized into low-promoting provinces (Zhejiang, Shanghai, Jiangsu, Tianjin, Guangdong), low-constraining provinces (Liaoning, Fujian, Hainan, Hebei, Guangxi), and high-constraining provinces (Shandong). Spatially, the “drag effect” is classified into three patterns: Low-Low (Shanghai), High-Low (Fujian), and no significant spatial effects. The “drag effect” of fishery resources in most provinces does not show significant spatial spillover effects. To ensure the sustainable and healthy development of the fishery economy, it is imperative to balance the input of fishery resources, capital, and labor, implement region-specific fishery development strategies, and strengthen cooperation among coastal regions to enhance resource utilization and reduce regional disparities.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"89 ","pages":"Article 104269"},"PeriodicalIF":2.1,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166940","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":"Satellite-based chlorophyll-a concentration variability and its relation to environmental changes in the Marmara Sea","authors":"Erdal Tokat","doi":"10.1016/j.rsma.2025.104267","DOIUrl":"10.1016/j.rsma.2025.104267","url":null,"abstract":"<div><div>This study aims to provide a detailed understanding of the spatiotemporal characteristics of chlorophyll-a (Chl-a) concentrations and their relationships with environmental factors in the Marmara Sea. For this purpose, four-kilometer resolution Aqua MODIS Chl-a concentration data from 2005 to 2021 were examined. Additionally, sea surface temperature (SST), meteorological data and fisheries catch data were analyzed over the same period. The variability and trends in the time series of Chl-a, environmental variables, and fisheries catches, as well as the cross-correlation relationships between these series, were investigated throughout the study period. The Marmara Sea experiences Chl-a blooms from November to April, driven by nutrient fluctuations from Black Sea inflow, river discharges, vertical mixing, upwelling and related processes. Net precipitation and temperature are also important drivers of Chl-a blooms, showing significant correlations with Chl-a, both with and without time lags. Monthly Chl-a climatology fields show uniform changes, with areas of high anthropogenic activity having higher levels throughout the year. Relatively low Chl-a values near the Bosphorus exit were observed in the climatology fields from February to April. Basin-averaged monthly mean Chl-a time series shows significant negative correlations with air temperature, sea temperature, and SST (r = -0.473 to −0.588, p &lt; 0.01) and a positive correlation with net precipitation (r = 0.403, p &lt; 0.01). High precipitation likely leads to elevated Chl-a, with a delayed effect. Air temperature, sea temperature, SST (0.049–0.066 °C/yr, <em>p</em> &lt; 0.01), and evaporation (0.409 mm/yr, <em>p</em> &lt; 0.05) show significant positive trends in the Marmara Sea. Large mucilage events were preceded by low Chl-a likely due to low precipitation. After these events, record-high Chl-a concentrations were observed, exhibiting different distribution patterns.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"88 ","pages":"Article 104267"},"PeriodicalIF":2.1,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154659","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}