Regional Studies in Marine Science最新文献

{"title":"Study on the coupling and interaction between modern marine industry and Marine multiple flows in China's coastal areas","authors":"Yuxin Tang,&nbsp;Mei Gai","doi":"10.1016/j.rsma.2025.104081","DOIUrl":"10.1016/j.rsma.2025.104081","url":null,"abstract":"<div><div>Modernization is the inevitable trend in the development of the marine industry. To thoroughly implement the national Marine economic development strategy, optimize the allocation of Marine resources, and comprehensively improve the comprehensive competitiveness of China's Marine economy, it is necessary to deeply explore the dynamic interaction between Marine industry and factor flow. This paper first defines the connotation of the modern Marine industry system, and based on exploring the logical relationship between the development of modern Marine industry and Marine multiple flows, takes China's coastal provinces as the research object, constructs the index system of modern Marine industry development and Marine multiple flows, and evaluates the development level, coupling and interactive response relationship between modern Marine industry and Marine multiple flows. It is found that although the level of the modern Marine industry and the coupling and coordination level of the two subsystems have been improved, there is still an obvious spatial differentiation law, and some coastal areas have not yet formed a positive interaction. The corresponding policy suggestions are also given. This study is of great significance for realizing China's strategic goal of becoming a maritime power and contributing to the high-quality development of the Marine economy.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104081"},"PeriodicalIF":2.1,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479320","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":"Freshwater plume’s impact on the thermohaline structure of the water column in the Central Zone of the Strait of Magellan","authors":"Vicente Aravena-Yáñez ,&nbsp;José Garcés-Vargas ,&nbsp;Iván F. Benavides-Martínez","doi":"10.1016/j.rsma.2025.104087","DOIUrl":"10.1016/j.rsma.2025.104087","url":null,"abstract":"<div><div>The Strait of Magellan, a sub-Antarctic channel connecting the Pacific and Atlantic oceans, is divided into three zones based on oceanographic and meteorological characteristics: Eastern, Central, and Western. The Central Zone is influenced by strong northwesterly winds and freshwater inputs from rivers and precipitation, making it crucial to understand its thermal and haline dynamics in response to these forcings. This study examines the seasonal variability of temperature and salinity in the water column at a fixed station in the Central Zone from 2018 to 2022, analyzing key environmental drivers. A detailed assessment of absolute salinity fluctuations in the upper layers was conducted using ocean reflectance from Sentinel-2 satellite data, river discharge, and wind dynamics, modeled with a generalized additive model incorporating delayed effects. Results reveal a seasonal surface temperature pattern, increasing in summer and decreasing in winter due to solar radiation. In winter, the surface layer remained relatively uniform, while summer conditions led to thermal stratification driven by intense solar heating. A winter thermal inversion was observed, attributed to reduced solar radiation and the vertical intrusion of warmer Modified Subantarctic Water from the Pacific. Surface salinity exhibited a seasonal cycle, with lower values and stronger stratification in winter due to freshwater discharge and wind-driven advection of the river plume toward the study site. In contrast, deeper layers remained relatively homogeneous in temperature and salinity, influenced by Pacific-origin Modified Subantarctic Water. Climate change-driven shifts in these forcings could alter the water column structure, impacting ecosystem functioning and Indigenous communities reliant on marine resources. This study provides essential insights into the thermal and haline dynamics of the Central Zone, supporting marine biodiversity management and conservation efforts in the region.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104087"},"PeriodicalIF":2.1,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464707","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":"Interactive effects of Lugol concentrations and soaking durations on physiology of fragment of soft coral, Sarcophyton serenei (Tixier-Durivault, 1958)","authors":"Ho Son Lam ,&nbsp;Nguyen-Thi Nguyet Hue ,&nbsp;Dang-Tran Tu Tram ,&nbsp;Do-Hai Dang ,&nbsp;Hoang-Xuan Ben ,&nbsp;Dao-Viet Ha ,&nbsp;Do-Huu Hoang","doi":"10.1016/j.rsma.2025.104078","DOIUrl":"10.1016/j.rsma.2025.104078","url":null,"abstract":"<div><div>The study investigated the impact of four Lugol concentrations and four soaking times on the self-attachment time of fragmental soft coral <em>S. serenei</em>. After fragmentation and soaking, the coral was cultured for 30 days with six replicates for each treatment. After 30 days of culture, the results indicated that the fastest self-attachment time was observed in treatment with 0.5 mL.L⁻¹ Lugol and soaked for 15 minutes, while the time until complete healing was in treatment without Lugol and soaked for 10 minutes. The Lugol concentration, soaking time, or their interaction did not significantly influence the growth rate, with the exception of the Lugol concentration, which significantly impacted the coral's growth in length. The study found that survival rates were highest in treatments with 0.5 mL.L⁻¹ Lugol and soaked for 15 minutes and 1.0 mL.L⁻¹ Lugol and soaked for 10 min, with a survival rate of 85.00 %. The lowest survival rate (71.67 %) was observed in treatments without Lugol and soaked for 20 minutes and 1.5 mL. L⁻¹ Lugol for 20 min. Mortalities were observed until day 9, and no further deaths were recorded until the end of the study period. The experiment showed high chlorophyll a and zooxanthellae concentrations in the coral at the start, with no significant differences among the treatments. On days 3 and 6, the chlorophyll a content and zooxanthellae decreased, but showed a slight recovered on day 9 and showed a slight higher than Chl-a and zooxanthallae in coral at initial. The Lugol concentration, soaking time, and their interaction did not significantly affect the chlorophyll a content or zooxanthellae of the coral fragments. Moreover, the highest organic weight was observed in the treatment with 1 mL.L⁻¹ Lugol and soaking for 15 min, whereas the lowest was recorded in the treatment with no Lugol and soaking for 20 min.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104078"},"PeriodicalIF":2.1,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471500","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":"Resilient mantle, vulnerable shell: Ocean acidification's impact on juvenile pen shell Atrina maura","authors":"Rosa Virginia Domínguez-Beltrán,&nbsp;Norma Yolanda Hernández-Saavedra,&nbsp;Martha Patricia Hernández-Cortés,&nbsp;Crisalejandra Rivera-Pérez","doi":"10.1016/j.rsma.2025.104082","DOIUrl":"10.1016/j.rsma.2025.104082","url":null,"abstract":"<div><div>Ocean acidification results from the accumulation of CO₂ in seawater. Predictions indicate a pH decrease of 0.3–0.5 units by the year 2100 and 0.7 units by the year 2300. The effects of OA vary among species, exposure time, physiological limits, and short-term adaptability. This phenomenon can be exacerbated in many coastal marine habitats due to nutrient inputs, upwelling events, and terrestrial sources of acidity. This study analyzed the effects of pH reduction on the shell and mantle tissue structure of the juvenile pen shell (<em>Atrina maura</em>) living in coastal bay where the natural pH is 7.8. These organisms were exposed to a reduction of pH (7.5) for 40 days. Scanning electron microscopy (SEM) analysis of the shells revealed signs of malformation and dissolution of the calcite prismatic layer and the nacre layer at acidic pH (7.5 ± 0.2) compared to controls (7.8 ± 0.1) throughout the experiment. However, shell growth increased 13.95 % after CO₂ injection after 40 days of exposure, while the shell index and the mantle tissue remained unaffected any of the times evaluated. The results suggest that <em>A. maura</em>, a species naturally exposed to acidic environments, may experience effects from pH reductions primarily in their shell microstructure, while mantle morphology remains unaffected. The results obtained here prove that resilience of marine species, such as <em>A. maura</em>, can be compromised by ocean acidification (OA), highlighting the importance of continued exploration in this field to better understand the broader implications of OA on marine ecosystems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104082"},"PeriodicalIF":2.1,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464706","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":"Review of metal concentration in Sardina pilchardus: Insights from the seas and oceans","authors":"Enrique Lozano-Bilbao ,&nbsp;Arturo Hardisson ,&nbsp;Soraya Paz ,&nbsp;Eduardo Franco-Fuentes ,&nbsp;Ángel J. Gutiérrez","doi":"10.1016/j.rsma.2025.104080","DOIUrl":"10.1016/j.rsma.2025.104080","url":null,"abstract":"<div><div>16 articles, meeting stringent criteria, were selected from 71 initially identified articles. Data on metal concentrations in <em>Sardina pilchardus</em> muscle were extracted, focusing on Al, As, B, Cd, Cu, Fe, Hg, Ni, Pb, and Zn, as well as vital macro and micronutrients. Exclusions encompassed non-indexed or non-peer-reviewed journals and studies lacking species names or specimen origin clarity. The Adriatic and Marmara Seas presented significant variations in metal concentrations, attributed to environmental, geographical, and anthropogenic influences. The Aegean Sea showed lower metal concentrations but remained a concern due to multiple anthropogenic sources. In the Mediterranean, disparities between Algeria and Morocco highlighted geological and anthropogenic influences. Variances in the Atlantic Ocean between the Canary Islands and the Azores reflected differing levels of human activity and natural processes.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104080"},"PeriodicalIF":2.1,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464708","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":"Data-limited stock assessment of yellow striped goatfish (Parupeneus chrysopleuron) from the southern Taiwan Strait","authors":"Peilong Ju ,&nbsp;Xintai Zou ,&nbsp;Mingru Chen ,&nbsp;Zhenbin Lu","doi":"10.1016/j.rsma.2025.104086","DOIUrl":"10.1016/j.rsma.2025.104086","url":null,"abstract":"<div><div>The yellow striped goatfish (<em>Parupeneus chrysopleuron</em>) represents a data-limited stock in the southern Taiwan Strait, posing significant challenges for stock assessment and fisheries management development. Length-based assessment methodologies offer a preliminary approach to estimate stock status through specific reference points. This study utilizes two length-based methods -LBSPR (length-based spawning potential ratio) and LBB (length-based Bayesian biomass method) in conjunction with growth parameters (<em>L</em>_<em>inf</em>, <em>L</em>_<em>50</em> and <em>L</em>_<em>95</em>) and various mortality rates (<em>M/K</em>) to evaluate this stock. Stock status is preliminarily assessed via reference points derived from LBSPR and LBB, along with <em>F/M</em> values from conventional mortality estimation methods. Results indicate that all the <em>F/M</em> and spawning potential ratio (<em>SPR</em>) values estimated from three LBSPR scenarios suggest overfishing, whereas LBB scenarios reveal the stock was either overfished or approaching overfishing conditions in 2018. Current management strategies for the yellow striped goatfish stock in the southern Taiwan Strait are deemed inadequate. The methodological approach outlined in this research provides a useful case study for assessing data-limited stock status and offers valuable insights for fisheries management in small-scale Chinese fisheries.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104086"},"PeriodicalIF":2.1,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444734","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":"First assessment of anthropogenic marine debris (AMD) in the mangroves of Andaman and Nicobar archipelago, Bay of Bengal","authors":"R. Kiruba-Sankar ,&nbsp;Kesavan Selvam ,&nbsp;Sirisha Adamala ,&nbsp;K. Saravanan ,&nbsp;Yuvaraj Eswaran ,&nbsp;J.Praveen Raj ,&nbsp;Akshatha Soratur ,&nbsp;Megha Ram","doi":"10.1016/j.rsma.2025.104091","DOIUrl":"10.1016/j.rsma.2025.104091","url":null,"abstract":"<div><div>We assessed the status of anthropogenic marine debris (AMD) in the mangrove forests of South Andaman Island, Bay of Bengal, which harbors 50 % of the world's true mangrove species. Surveys were conducted across 20 mangrove sites using 1 × 1 m quadrats, covering an area of 1000 m². A total of 6732 debris items, including plastics and non-plastics, were recorded during the surveys. Plastics constituted 68.82 % of the debris, dominated by PET bottles (18.16 %), while non-plastic debris, primarily Tetra packs (18.06 %), glass bottles and beverage cans, contributed 31.18 %. Based on the International Coastal Cleanup classification, land-based sources accounted for 81.52 % of the debris, followed by sea-based (10.09 %) and mixed sources (8.39 %). Carbyn Cove exhibited the highest debris abundance (2162 items) among the twenty sites. The mean debris density was 23.4 items/m², ranging from 135.1 items/m² at Carbyn Cove to 5.9 items/m² at Panighat. Principal Component Analysis revealed patterns linked to local tourism &amp; urbanization, and K-means clustering highlighted associations between debris types and locations. The highest abundance of AMD in Carbyn Cove mangroves and its proximity to coastal settlements and tourist beaches revealed the urgent need to strengthen awareness of solid waste disposal in the marine environment. This baseline study highlights the pressing need for ongoing debris removal initiatives and community awareness regarding waste disposal to avert the long-term accumulation of AMD in mangroves. The findings offer essential insights for policymakers and resource managers to formulate effective solid waste management strategies in the Andaman and Nicobar Islands mangrove ecosystems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104091"},"PeriodicalIF":2.1,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512337","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":"Occurrence of multidrug-resistant Enterobacteriaceae and antibiotic-resistant genes in the anthropogenic impacted bay of Nha Trang, Viet Nam","authors":"Hoang Son Tran ,&nbsp;Dinh Quang Vu ,&nbsp;Dang Quang Nguyen ,&nbsp;Duc Thinh Bui ,&nbsp;Thu Uyen Do ,&nbsp;Thi Thu Hang Le ,&nbsp;Thi Thanh Tam Tran ,&nbsp;Hoang Nam Pham ,&nbsp;Kim Hanh Nguyen ,&nbsp;Trung Du Hoang ,&nbsp;Anne-Laure Bañuls ,&nbsp;Gwenn Pulliat ,&nbsp;Sylvain Théry ,&nbsp;Yvan Bettarel ,&nbsp;Jean-Christophe Auguet ,&nbsp;Quang Huy Nguyen","doi":"10.1016/j.rsma.2025.104084","DOIUrl":"10.1016/j.rsma.2025.104084","url":null,"abstract":"<div><div>Antimicrobial resistance (AMR) has increased significantly due to the widespread transmission of multidrug-resistant (MDR) bacteria and antibiotic-resistance genes (ARGs) within and between animals, environments, and humans. Unfortunately, the AMR situation in the coastal areas is little known. In this study, we investigated the occurrence and distribution of MDR Enterobacteriaceae from water and sediment samples collected in Nha Trang Bay, Viet Nam. Overall, 48/107 (45.8 %) identified and isolated bacteria belong to risk group 2 pathogens. More than 57 % of Enterobacteriaceae isolates exhibited MDR phenotypes, in which <em>Escherichia coli</em>, <em>Klebsiella pneumoniae,</em> and <em>Citrobacter freundii</em> were the most prevalent species. In addition, eight ARGs including <em>sul</em>1, <em>sul</em>2, <em>sul</em>3, <em>tet</em>Q, <em>tet</em>B, <em>mec</em>A, <em>bla</em>_VIM and <em>bla</em>_KPC were detected with high abundance in most of water and sediment samples. Notably, class 1 integron-integrase gene <em>intI1</em> was widely distributed (95.8 %) in all samples with a total absolute abundance of 2.9 × 10⁵ copies/ml water and 9.7 × 10⁷ copies/g sediment. We also identified significant relationships between <em>sul</em>3, <em>tet</em>B, <em>bla</em>_VIM, <em>bla</em>_KPC and <em>intI1</em> with bacterial density, chlorophyll A, phosphorus and temperature. These observations suggest that <em>intI1</em> gene and nutrients could promote the emergence and propagation of antibiotic-resistance bacteria (ARB) and ARGs in the Nha Trang Bay.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104084"},"PeriodicalIF":2.1,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474466","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":"Analysis of regional variation of water transparency in the Yellow Sea and East China Sea based on MODIS data","authors":"Young Baek Son ,&nbsp;Eung Kim ,&nbsp;Jin Hyung Cho ,&nbsp;Sun Kyeong Choi ,&nbsp;Donhyug Kang","doi":"10.1016/j.rsma.2025.104093","DOIUrl":"10.1016/j.rsma.2025.104093","url":null,"abstract":"<div><div>Water transparency is an important optical parameter used to interpret various properties related to water quality. We investigated regional variation in water transparency in the Yellow Sea (YS) and East China Sea (ECS) by conducting linear regression and k-means clustering analyses based on satellite-derived water transparency data and satellite products including MODIS sea surface temperatures (SSTs) and chlorophyll a concentration (Chl), colored dissolved organic matter (CDOM), and total suspended matter (TSM) levels for the period 2003–2023. Water transparency showed seasonal variation, increasing in summer and decreasing in winter, with larger seasonal extremes observed in the central YS and around Jeju Island than in coastal waters of Korea and China. Decadal variation in water transparency was significantly higher in summer and autumn than in spring and winter throughout the study area, exhibiting an increasing trend that was strongly correlated with decreasing Chl, CDOM, and TSM levels. K-means analysis resulted in the selection of five regions in the YS and ECS, among which spatial and temporal variation in water transparency were related to different regional impact factors. Coastal waters of Korea and China and the southern YS displayed a weaker increase in water transparency, which was associated mainly with Chl, followed by TSM and CDOM. In contrast, water transparency tended to increase dramatically in the central YS, where decadal variation was associated mainly with changes in TSM, followed by Chl and CDOM levels. Thus, regional variation in water transparency in the study area was dependent on local water conditions. These findings will be useful for understanding regional water quality in the study area.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"84 ","pages":"Article 104093"},"PeriodicalIF":2.1,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143576966","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":"Temporal variations in water quality in a tropical urbanized estuary","authors":"Marianne P. Mello ,&nbsp;Anderson de S. Cabral ,&nbsp;Fernando N. Pinto ,&nbsp;Fernando Pulgati ,&nbsp;Jean L. Valentin ,&nbsp;Rodolfo Paranhos","doi":"10.1016/j.rsma.2025.104070","DOIUrl":"10.1016/j.rsma.2025.104070","url":null,"abstract":"<div><div>Seasonal variability in water quality plays a crucial role in understanding the resilience and impacts on culturally eutrophic estuarine environments, such as Guanabara Bay (Brazil). We evaluated potential seasonal influences on a culturally eutrophic estuarine environment during 2011 and 2012 by assessing water quality variables at six sites visited monthly. Despite persistent sewage discharges and elevated nutrient levels, we hypothesize a hydrobiological response to climatic variations. All data were compiled into a database and analyzed using descriptive statistics. Principal Component Analysis (PCA) was employed to integrate chemical and biological data, providing insights into general ecological patterns within Guanabara Bay. Time series analyses were performed using adjusted models to examine the nature and structure of the data, prioritizing pattern evaluation over forecasting scenarios. Significant seasonal variations were observed for nitrogenous compounds (ammonia and nitrite), temperature, and dissolved oxygen. During the dry season (May to September), ammonia and nitrite concentrations were high, while temperature and dissolved oxygen were low. The opposite pattern was observed during the rainy season (October to April). Rainfall and river drainage, which carry domestic and industrial sewage from the bay’s watershed, strongly influenced surface waters. In contrast, bottom waters appeared unaffected by seasonal influences, instead responding to tidal currents. Despite severe negative environmental impacts, significant trends were obtained even with just two years of data. These findings indicate that annual climatic cycles mainly drive seasonal patterns in Guanabara Bay’s water quality.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"83 ","pages":"Article 104070"},"PeriodicalIF":2.1,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420246","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}