Regional Studies in Marine Science最新文献

{"title":"Inter-annual variability in the phytoplankton abundance and community structure of a tropical monsoonal estuary in response to variable monsoonal patterns","authors":"Liya V. Benjamin ,&nbsp;Ratheesh Kumar R ,&nbsp;Shelton Padua ,&nbsp;Vineetha G ,&nbsp;Sajna V.H ,&nbsp;Parvathy R.","doi":"10.1016/j.rsma.2024.103869","DOIUrl":"10.1016/j.rsma.2024.103869","url":null,"abstract":"<div><div>The study elucidates the inter-annual and seasonal variability in the phytoplankton abundance and community structure concurrent to variable rainfall patterns in Chettuva, a tropical monsoonal estuary along the southwest coast of India. The phytoplankton community exhibited statistically significant inter-annual variation with a 1.2-fold increase in abundance (av. 19.44 ×10⁴cellsL⁻¹) in 2021 in comparison with 2019 (av. 15.30 ×10⁴cellsL⁻¹). A total of 87 phytoplankton species were observed during the study, among which Bacillariophyceae dominated with 52 species, followed by Dinophyceae (20 species), and to a lesser extent by Chlorophyceae (11 species) and Cyanophyceae (2 species). Phytoplankton community structure also showed variation, with 71 species contributing to the diversity in 2021 and 62 species in 2019. Though Bacillariophycea dominated during both years, the community was more diverse in 2021comparatively a more saline year <em>Biddulphia</em> sp. <em>Coscinodiscus</em> sp.<em>, Cyclotella striata, Melosira sulcata, Pleurosigma</em> sp.<em>,</em> and <em>Skeletonema costatum</em> were the diatoms common to both the years, though with varied abundance. Dinophyceae did not show a conspicuous change in community structure in both years, with mostly the same species contributing to the total phytoplankton population but showed slight variation in abundance. Cyanophycea was observed exclusively during the year 2021. The abundance and community structure of the species varied from year to year, but they also changed seasonally, with lower numbers observed during the monsoon compared to the post-monsoon period in both years. CCA analysis identified two groups of phytoplankton assemblages in relation to the prevailing environmental conditions. The Group I species preferred lower temperature and salinity and elevated nutrient concentrations and they dominated during the monsoon season. Group II species preferred high saline well oxygenated, nutrient-poor waters and they dominated during the post-monsoon. Furthermore, the trophic state index analysis indicated mesotrophic conditions during the monsoon, while eutrophic conditions were observed in the post-monsoon period.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103869"},"PeriodicalIF":2.1,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528032","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":"Distinct bacterial and eukaryotic communities reflect the specificity of different coral reefs in the South China Sea","authors":"Fulin Sun ,&nbsp;Hongqiang Yang ,&nbsp;Xingyu Song ,&nbsp;Zhiyuan Ouyang","doi":"10.1016/j.rsma.2024.103867","DOIUrl":"10.1016/j.rsma.2024.103867","url":null,"abstract":"<div><div>The microbial composition of surrounding waters is crucial for the health of coral reefs and holds significant value for understanding the complexity and environmental adaptability of coral reef ecosystems. This study reveals the spatial heterogeneity and diversity characteristics of bacterial and eukaryotic communities in different coral reef regions of the South China Sea. Chao and Shannon indices showed significant differences (<em>p</em> &lt; 0.05) in diversity of bacterial and eukaryotic communities across different coral reefs. PCoA (principal coordinate analysis) indicates significant differences in community composition among regions, highlighting the crucial role of coral reef environmental heterogeneity on microbial community. NST (normalized stochasticity ratio) analysis indicates that community assembly in coral reef areas is more influenced by ecological stochastic processes. Major bacterial groups include Proteobacteria, Cyanobacteria, and Bacteroidota, while dominant eukaryotic groups include Dinophyceae, Apicomplexa, Bacillariophyta, Florideophyceae, Mamiellophyceae, Syndiniales, Prasino-Clade-VII, and Ascomycota, each showing significant abundance differences across coral reef regions (<em>p</em> &lt; 0.05). High abundance of Rhodobacterales and Flavobacteriales are detected in all coral reef waters. Correlation analysis indicates that temperature, pH, and salinity are important factors affecting the bacterial and eukaryotic communities. This study reveals the spatial heterogeneity of microbial communities in coral reef regions of South China Sea and underscores the significant impact of marine environmental heterogeneity on community structure.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103867"},"PeriodicalIF":2.1,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540062","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":"Coastal vulnerability index for the indented coastline of Primorje-Gorski Kotar County, Croatia","authors":"Andrea Tadić ,&nbsp;Nino Krvavica ,&nbsp;Čedomir Benac ,&nbsp;Igor Ružić","doi":"10.1016/j.rsma.2024.103862","DOIUrl":"10.1016/j.rsma.2024.103862","url":null,"abstract":"<div><div>The study explores the general vulnerability of the coastline, with a focus on assessing vulnerability using the coastal vulnerability index (CVI) along the highly indented coastline of Primorje-Gorski Kotar County (PGC), Croatia. Vulnerability was assessed every 25 m of the 1235 km long coastline by calculating the CVI based on five representative variables: geological setting, coastal slope in relation to terrain instabilities (rockfalls and landslides), significant wave height, coastal flooding, and beaches, which were also integrated into a single overall CVI. The length of the coastline, characterised by different relief forms, and the scale of available data required an adaptation of the commonly used methodology. The results show a low overall vulnerability, mainly due to the prevalence of relatively resistant carbonate sedimentary rocks along the coasts. However, almost a quarter of the investigated coastline is highly or very highly vulnerable to coastal flooding. Of particular concern is the fact that many of the most vulnerable areas are inhabited. Analyses at this scale are suitable for regional spatial planning. The results of the conducted research are available publicly online, which enables their practical application for planning and management of coastal areas. Adaptation to the impacts of climate change is highly dependent on the location itself, but overall, this assessment provides indications of the most vulnerable locations in the PGC, where it is necessary to limit interventions in the coastal area.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103862"},"PeriodicalIF":2.1,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528468","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 impact of artificial barrage on calanoid copepods in the Vembanad Lake, Southwest Coast of India","authors":"Retina I. Cleetus ,&nbsp;C.V. Asha ,&nbsp;S. Bijoy Nandan ,&nbsp;P.S. Suson ,&nbsp;P.R. Jayachandran","doi":"10.1016/j.rsma.2024.103865","DOIUrl":"10.1016/j.rsma.2024.103865","url":null,"abstract":"<div><div>The Vembanad Lake (VL) is a brackish water lagoon, an integral part of Ramsar site, Vembanad Kol Wetland ecosystem on the southwestern coast of India. VL faces escalating anthropogenic impact, notably worsened by the establishment of the Thanneermukkom barrage (TMB) in 1976. This study hypothesizes that the TMB has led to significant ecological changes in VL, specifically altering the distribution and abundance of calanoid copepods, which are vital as a food source for higher trophic levels, particularly fish. To test this hypothesis, zooplankton samples were collected from various sites along the lake, and environmental parameters such as salinity and chlorophyll-a concentration were measured. This investigation reveals a distinct limnetic zone in the southern region, in contrast to the oligo-mesohaline zone in the north, attributed to the TMB. The study identifies the prevalence of calanoid copepod species such as <em>Heliodiaptomus cinctus</em>, <em>Allodiaptomus mirabilipes</em>, and <em>Acartiella gravelyi</em> in the TMB-South region, reflecting a freshwater-dominated ecosystem. The low salinity and high chlorophyll-a content in this area create an optimal environment for these species. In contrast, the dominance of <em>Acartia</em> (<em>Odontacartia</em>) <em>spinicauda</em>, <em>Pseudodiaptomus serricadatus</em>, and <em>Paracalanus</em> sp. in the TMB-North indicates higher salinity levels, with species in this region adapting to a different ecological niche. Thus, the installation of the TMB has significantly altered the ecological balance of VL by dividing the water body into two distinct salinity zones. This separation has led to changes in the distribution and abundance of calanoid copepods, which are essential for energy transfer to higher trophic levels in the VL food web, consequently affecting fish populations and overall biodiversity.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103865"},"PeriodicalIF":2.1,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528405","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":"Differences in the impact of intense ENSO+ in Bahia Magdalena (SW of Baja California, Mexico) in the context of climate change","authors":"María del Carmen Jiménez-Quiroz ,&nbsp;Francisco Javier Barrón-Barraza ,&nbsp;Rafael Cervantes-Duarte ,&nbsp;René Funes-Rodríguez ,&nbsp;Rogelio González-Armas","doi":"10.1016/j.rsma.2024.103864","DOIUrl":"10.1016/j.rsma.2024.103864","url":null,"abstract":"<div><div>The Bahia Magdalena-Bahia Almejas (BM-BA) complex is the largest coastal lagoon system in the Mexican Pacific; it is in a transitional zone between temperate and tropical regions. BM-BA has a high biodiversity and is an important source of fishing resources; however, its productivity diminishes during ENSO+ events. This work aimed to compare the impact of the three most intense ENSOs (1982–1983, 1997–1998, and 2015–2016) on their environmental and biological characteristics in the context of global warming. Since 1970, this region has been warming, and the chlorophyll-<em>a</em> is diminishing; however, short-term environmental variations associated with basin-scale processes have modified these trends. The comparison showed that the equatorial influence on the 1997–1998 ENSO was more evident, while the North Pacific conditions and other large-scale environmental processes influenced the other ENSOs: in 1982–1983, the warm signal continued after the ENSO+ ended, and in 2015–2016, it was present before the ENSO+ onset due to the MWH The Blob and probably global warming. High temperatures at the basin scale altered large-scale wind patterns, weakening local upwelling and diminishing the nutrient input. The Equatorial and North Pacific influence on BM varies over time (as expected in a transition zone like BM); however, in recent years, North Pacific warming associated with climate change has probably gained relevance and modulated the effect of ENSO+.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103864"},"PeriodicalIF":2.1,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528577","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":"Biodiversity associated with a coralligenous build-up off Sicily (Ionian Sea)","authors":"Gemma Donato ,&nbsp;Rossana Sanfilippo ,&nbsp;Daniela Basso ,&nbsp;Pietro Bazzicalupo ,&nbsp;Marco Bertolino ,&nbsp;Valentina Alice Bracchi ,&nbsp;Mara Cipriani ,&nbsp;Francesco D’Alpa ,&nbsp;Adriano Guido ,&nbsp;Mauro Pietro Negri ,&nbsp;Francesco Sciuto ,&nbsp;Donatella Serio ,&nbsp;Antonietta Rosso","doi":"10.1016/j.rsma.2024.103868","DOIUrl":"10.1016/j.rsma.2024.103868","url":null,"abstract":"<div><div>Coralligenous is one of the most important habitats of the Mediterranean Sea hosting a very high biodiversity that, however, has not been fully investigated yet. The paper addressed the study of the biodiversity of a coralligenous bioconstruction collected at a depth of 36.7 m off Marzamemi (SE Sicily, Ionian Sea). The species diversity, composition and structure of the main associated taxonomic groups were investigated in order to identify possible differences between the communities of the hard framework (mainly built by calcified corallinales) and the canopy cover. The examined build-up showed significant species diversity for almost all groups. Bryozoans were the most diversified group and, together with foraminifers, also the most abundant both on the canopy and the frame. Further groups showed high species diversity (except for serpulids) and total abundance (except for molluscs) on the canopy rather than on the frame. Due to their different nature and microenvironmental parameters, the canopy and the frame hosted different communities. Besides juvenile specimens, the canopy mostly hosted unmineralized and weakly mineralized, small-sized, short-lived species well adapted to living on ephemeral and flexible substrates. On the contrary, the rigid and persistent frame mostly hosted highly mineralized, large, long-lived species, which usually contributed to the building and strengthening of the bioconstruction. Unlike mapping and monitoring, a thorough description of coralligenous biodiversity requires accurate naked eye and microscopical analysis assisted by SEM investigation due to the small size and cryptic behaviour of several species.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103868"},"PeriodicalIF":2.1,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528031","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":"How environmental data enables intelligent navigation: Factors assessment of affecting the navigation in the Northeast Arctic Route","authors":"Jihong Chen ,&nbsp;Xitao Zhang ,&nbsp;Lang Xu ,&nbsp;Shanshan Fu","doi":"10.1016/j.rsma.2024.103861","DOIUrl":"10.1016/j.rsma.2024.103861","url":null,"abstract":"<div><div>Due to the more favorable navigational environment and higher safety along Northeast Arctic Route, this route is being used more and more frequently for international shipping. In this research, the factor analysis method is applied to assess the navigational environment of each sea area in the Northeast Arctic Route, revealing the effects of Arctic navigation influence factor on the navigational environment, and analyzing the change trend of the navigational environment of different sea areas in different seasons. Further, the effects of multiple factors on the number of voyages are discussed through multiple stepwise regression model, including the navigational environment score, geopolitical risk, export &amp; import trade and the probability of pollution accidents, then the Interrupted time series analysis (ITSA) method combined with seasonal decomposition is explored the effect of emergencies on the number of voyages on the Northeast Arctic Route. The number of voyages on the Northeast Arctic Route has been altered to varying degrees by the occurrence of various emergencies. Further, the Yamal LNG project and the Russian-Ukrainian conflict have a significant effect on the number of voyages, while the Covid-19 epidemic has a lesser effect on the number of voyages.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103861"},"PeriodicalIF":2.1,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432502","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":"Unveiling hidden threats: Assessing the risks of potentially toxic elements (PTEs) in contaminated fish of the Anzali Wetland","authors":"Fatemeh Salehi ,&nbsp;Saeed Sharafi ,&nbsp;Ali Kazemi ,&nbsp;Milad Esmaeilbeigi","doi":"10.1016/j.rsma.2024.103853","DOIUrl":"10.1016/j.rsma.2024.103853","url":null,"abstract":"<div><div>The environmental degradation caused by potentially toxic elements (PTEs) and its consequential health risks to humans and the environment have raised profound concerns. To explore the potential hazards associated with PTEs, we analyzed the total concentration of As, Cd, Cr, Hg, and Pb in the muscle, gills, viscera, and eggs of four fish species <em>Esox lucius</em> Linnaeus, 1758 (Pike), <em>Cyprinus carpio</em> Linnaeus, 1758 (Carp), <em>Vimba vimba</em> Linnaeus, 1758 (Vimba), and <em>Tinca tinca</em> Linnaeus, 1758 (Tinca) collected from the Anzali Wetland. We measured the concentrations of trace metals in the fish samples and calculated the associated human health risks and compared the results with the international standards. Our findings showed the PTEs concentrations in fish samples with Cr &gt; Hg &gt; Pb &gt; Cd &gt;As. We observed Cr, Hg, and Pb concentrations (3.4 ± 1.61, 2.57 ± 1.24, and 1.7 ± 0.48 μg g⁻¹ wet weight (w.w.), respectively) in muscle samples, Cd concentration (1.05 ± 0.53 μg g⁻¹ w.w.) in eggs, and As concentration (0.40 ± 0.13 μg g⁻¹ w.w.) in viscera of Pike. Consequently, Pike exhibited the highest concentrations of these metals across all its sampled tissues. Comparing the results to the standard set by the World Health Organization (WHO) declared that the average heavy metal concentrations exceeded the permissible limits for certain elements. Results also indicated that the concentrations of As and Pb in all fish species posed potential health risks, particularly to children, with a target hazard quotient THQ&gt; 1. Moreover, the presence of As and Pb metals in all human age groups, as well as Cr and Hg metals, indicated a potential risk of cancer for children (Cr &gt; 1E-4). Therefore, the metal pollution status of the Anzali Wetland not only influences the biodiversity of fish but potentially poses health-related issues to the target consumers.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103853"},"PeriodicalIF":2.1,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441255","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":"Assessing ecological risks and microplastic pollution in a tropical coastal ecosystem: Effects of rainfall variability in Southeast India","authors":"Partheeban Emmanuel Charles,&nbsp;Rajendran Rajaram","doi":"10.1016/j.rsma.2024.103858","DOIUrl":"10.1016/j.rsma.2024.103858","url":null,"abstract":"<div><div>Microplastic pollution poses a significant threat to coastal ecosystems, prompting an in-depth investigation into its seasonal fluctuations and ecological impacts. This study examines microplastics in Cuddalore’s coastal waters and sediments across four seasons. Results show varying microplastic concentrations, peaking during the monsoon and pre-monsoon seasons, likely influenced by rainfall variability. Fibers dominate in both water (69–100 %) and sediment samples (66–92 %), with polyethylene and polyethylene terephthalate as the predominant polymer types in water. Sediments exhibit a more diverse polymer distribution, with polypropylene and polyethylene terephthalate being prevalent. Elevated polymer hazard index and potential ecological risk index raise concerns, reaching values of 108930 and 1125, respectively. This underscores the urgency of implementing effective management strategies to safeguard tropical coastal ecosystems from microplastic pollution. This study highlights the complex interplay between seasonal dynamics, rainfall variability, polymer types, and pollution levels, emphasizing the need for proactive environmental management measures.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103858"},"PeriodicalIF":2.1,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432501","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":"Heavy metals toxicity in edible bivalves and risk exposure to humans through its consumption from Adyar Estuary, Tamilnadu, India – A baseline study","authors":"Tamil Selvan Chandrasekaran ,&nbsp;John Milton ,&nbsp;Bharathi Santhanabharathi ,&nbsp;Kumara Perumal Pradhoshini ,&nbsp;Louis Cojandaraj ,&nbsp;Marckasagayam Priyadharshini ,&nbsp;Munawar Suhail Ahmed ,&nbsp;Mohamed Saiyad Musthafa ,&nbsp;Paulraj Balaji ,&nbsp;Caterina Faggio","doi":"10.1016/j.rsma.2024.103854","DOIUrl":"10.1016/j.rsma.2024.103854","url":null,"abstract":"<div><div>The Adyar estuary, situated at the heart of Chennai city, India, has been subjected to significant anthropogenic pollution over the past decade due to rapid urbanization and industrialization.</div><div>This study endeavored to explore the bioaccumulation patterns of heavy metals within bivalve species including <em>Perna viridis, Mercenaria mercenaria</em>, and <em>Lamellidens marginalis</em>. Additionally, it aimed to assess the concentrations of heavy metals present in water samples obtained from ten discrete stations within the Adyar estuary across different seasonal periods. To better understand the dynamics of contamination, metal pollutants including Cd, B, Cu, Fe, Mn, Pb, and Zn were analyzed in the soft tissues (Gill, Kidney, and Muscle) of the bivalves using Atomic Absorption Spectrophotometer (AAS) (ELICO's SL- 176). The study also investigated the seasonal changes in biochemical constituents affecting the nutritional quality of these edible bivalves following conventional methods, and estimated the risk (both carcinogenic and non-carcinogenic) to consumers. Results showed that the biochemical constituents of <em>Perna viridis</em> and <em>Mercenaria mercenaria</em> were comparatively lower than those of the freshwater bivalve <em>Lamellidens Marginalis</em> (p &gt; 0.05). Heavy metal accumulation in the mussels followed the order Mn &gt; Zn &gt; Cu &gt; Pb &gt; Fe &gt; Cd &gt; B. The highest uptake of metals by the bivalves occurred during the post-monsoon season, while the least uptake was observed during the monsoon season. The overall metal burden for the studied species followed the descending order <em>M. mercenaria</em> &gt; <em>P. viridis</em> &gt; <em>L. marginalis</em>. The study indicated that both carcinogenic and non-carcinogenic risks to humans from consuming these mussels were higher due to the excessive accumulation of metals Zn and Mn in all three studied bivalves.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103854"},"PeriodicalIF":2.1,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540061","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}