Regional Studies in Marine Science最新文献

{"title":"Onboard test-based exhaust emission factors for marine diesel engines on anchor handling tug supply vessels","authors":"Yaoqi Kang ,&nbsp;Bo Wang ,&nbsp;Shuqiang Liu ,&nbsp;Mingliang Chen ,&nbsp;Zixiao Ye ,&nbsp;Zibin Yin","doi":"10.1016/j.rsma.2024.103866","DOIUrl":"10.1016/j.rsma.2024.103866","url":null,"abstract":"<div><div>In order to accurately assess China’s port air pollution caused by AHTS (Anchor Handling Tug Supply Vessels) ships, 46 diesel engines on 27 AHTS ships were tested for onboard emissions using a large gas analyzer to statistically analyze their fuel-based and power-based emission factors. The results show that fuel-based NOx-emission factors for MEs, SEs and AEs before and after the use of the SCR system are 45.4, 38.24,33.04 g/kg and 6.35, 4.98, 5.82 g/kg, CO-emission factors are 7.95, 6.30, 7.96 g/kg and 6.90, 6.93, 8.32 g/kg, THC-emission factors are 0.49, 0.64, 0.25 g/kg and 0.42, 0.47, 0.22 g/kg, and CO₂-emission factors are 3121.62, 3121.34, 3093.12 g/kg and 3088.14,3091.40, 3085.21 g/kg, respectively. Power-based NOx-emission factors for MEs, SEs and AEs before and after the use of the SCR system are 9.71, 8.61, 7.58 g/(kW·h) and 1.37, 1.23, 1.33 g/(kW·h), CO-emission factors are 1.71, 2.08, 1.84 g/(kW·h) and 1.47, 1.53, 1.93 g/(kW·h), THC-emission factors are 0.10, 0.14, 0.05 g/(kW·h) and 0.09, 0.13, 0.06 g/(kW·h), and CO₂-emission factors are 671.73, 700.58, 718.46 g/(kW·h) and 664.42, 694.16, 716.92 g/(kW·h), respectively. The power-based emission factor is closely related to the diesel engine load, and the relationship between different exhaust emissions and diesel engine load shows different patterns. In addition, it was found that the NOx emissions of the ship decreased significantly to meet the IMO Tier III requirements after running SCR. The emission factors of CO, HC and CO₂ have no obvious change whether SCR systems were operated or not. The AHTS marine engine emission factors obtained in this paper are highly relevant and can provide reliable data for establishing a suitable emission inventory for medium and high speed engineering support vessels.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103866"},"PeriodicalIF":2.1,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432499","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 traits and functional diversity of free-living nematode assemblages along a water-depth gradient in the northwestern of Gulf of Mexico","authors":"Abel Abraham Vargas-Espositos,&nbsp;Alberto de Jesús-Navarrete,&nbsp;Wilbert Andrés Pérez-Pech,&nbsp;Abril Anguas-Escalante","doi":"10.1016/j.rsma.2024.103860","DOIUrl":"10.1016/j.rsma.2024.103860","url":null,"abstract":"<div><div>This study analyzed the biological traits (BTs) and functional diversity (FD) of free-living nematodes in the northwestern of Gulf of Mexico. We collected sediment samples at 27 sites at a depth gradient from 44 to 3466 m. The nematodes were identified at species level and classified in five groups of BTs: feeding type, amphid shape, tail shape, body shape, and body length. We determined the FD based on the combination of BTs through a functional dendrogram, using the total length of the branch as a measure of functional diversity. Salinity, pH, and dissolved oxygen were measured in each site, as well as the sediment composition and percentage of organic carbon (OC). A total of 1673 nematodes were identified, belonging to 35 families, 96 genera, and 153 species. The number of species varied along water depth (1–60 species). The more abundant BTs were the non-selective deposit feeders (49 %), amphid spiral shape (55 %), clavate conical cylindrical tail (52 %), sizes 1000–1500 μm (51 %), and body shape slender (97 %). The most common combination of traits was non-selective deposit feeders, spiral amphid, clavate conical cylindrical tail, slender shape, and sizes &lt; 1500 μm. The changes of BTs with increasing depth were more evident in the feeding types and amphid shape. The FD fluctuated between sites (0.42–0.99) and was significantly correlated with the number of species, suggesting that taxonomic and functional diversity have similar responses to environmental variables. The FD was significantly influenced only by the percentage of sands. Our data provide valuable information that can be used in subsequent studies and benthos monitoring.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103860"},"PeriodicalIF":2.1,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428206","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 inhomogeneity analyses of extreme sea levels along Lianyungang coast based on numerical simulation and Monte Carlo model","authors":"Baiwen Liu,&nbsp;Sudong Xu,&nbsp;Kai Yin","doi":"10.1016/j.rsma.2024.103856","DOIUrl":"10.1016/j.rsma.2024.103856","url":null,"abstract":"<div><div>The prediction of extreme sea levels in coastal areas has been a prominent requirement of coastal engineering design and planning. The research was based on the frequent disasters caused by typhoon storm surges in China and the demand for reasonable improvement of port structures in coastal areas. Delft3D hydrodynamic model and the Monte Carlo model were integrated to predict the spatial distribution of extreme sea levels along the coast of Lianyungang city in Jiangsu province. The Monte Carlo model was adopted to generate stochastic typhoon characteristic sequences as meteorological driving forces. In the hydrodynamic model, meteorological factors were coupled with the astronomical tide to simulate storm surge scenarios. Extreme sea levels were estimated by ranking maximum levels of simulated storm surge events. This programming was feasible compared to the prediction results of frequency analysis methods. The research showed that the predicted 1 in 100-year extreme sea level of Lianyungang station was 3.75 m, while the predicted 1 in 200-year value was 3.85 m. The programming was adopted to predict extreme sea levels of several stations and analyze the spatial distribution characteristics of extreme sea levels in four port areas of Lianyungang Port. Results revealed that extreme sea levels in modeling areas had significant spatial inhomogeneity, which might be related to the concavity of coastlines, islands, and terrains. Estimating spatial extreme sea levels could better cognize the influence of inundation disasters in coastal areas and be conducive to the design of port structures and the safety of port operations.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103856"},"PeriodicalIF":2.1,"publicationDate":"2024-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428602","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":"Can automatic measuring replace humans when evaluating a shrimp fishery?","authors":"Bent Herrmann ,&nbsp;Elling Ruud Øye ,&nbsp;Jonatan Sjølund Dyrstad ,&nbsp;Anja Helene Alvestad","doi":"10.1016/j.rsma.2024.103852","DOIUrl":"10.1016/j.rsma.2024.103852","url":null,"abstract":"<div><div>Size measurements of fish and crustacean species play a critical role in fishery stock assessments, fishing gear size selectivity studies, and monitoring compliance with fisheries management regulations. One such example is from shrimp fisheries where samples of trawl-caught shrimps are frequently collected and size measured. However, the manual measurement of hundreds of small shrimps per sample is time-consuming and exhausting. Therefore, this study evaluates whether an automatic measuring procedure using off-the-shelf camera technology and a general-purpose artificial intelligence algorithm can replace manual measurements of deep-water shrimp (<em>Pandalus borealis</em>). Despite some deviations between manual and automatic measurements for individual shrimps, the automatic method proved sufficiently accurate for stock, gear selectivity and compliance assessment. Furthermore, this study demonstrated how a use-case driven approach can be applied when evaluating whether a new measuring technology can replace an existing.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103852"},"PeriodicalIF":2.1,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The cadmium content in commercially key species of seafood from Shandong, China: Potential human health risk estimation","authors":"Junyi Shi ,&nbsp;Sijia Liu ,&nbsp;Xi Wu ,&nbsp;Jiaxi Zhang ,&nbsp;Ziheng Yan ,&nbsp;Xiaoming Zhao ,&nbsp;Xing Wu ,&nbsp;Yongfeng Jia","doi":"10.1016/j.rsma.2024.103838","DOIUrl":"10.1016/j.rsma.2024.103838","url":null,"abstract":"<div><div>Seafood serves as a vital protein source for human nutrition, yet it also significantly contributes to the intake of dietary cadmium. In this study, we measured the cadmium content in 274 samples from 20 species, including fish, shrimp, and bivalves collected across five cities in Shandong province and assessed the associated health risks for local residents with varying consumption habits. The findings revealed a distinct increasing trend in cadmium concentrations from pelagic fish to benthic bivalve species; however, no evidence of biomagnification was observed among the studied species. Health risk assessments indicated that while there were no non-carcinogenic health risks posed by seafood consumption for local residents exposed to cadmium, carcinogen risks exceeded acceptable levels for lifetime cancer risk. Furthermore, children exhibited approximately twice as high risk indices compared to adults. Bivalve consumption emerged as the primary contributor to these health risks.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103838"},"PeriodicalIF":2.1,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428201","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":"Post-harvest loss assessment of Hilsa (Tenualosa ilisha) along the value chain in Bangladesh","authors":"Syed Ariful Haque ,&nbsp;Md. Fakhrul Islam ,&nbsp;Saud M. Al-Jufaili ,&nbsp;Mohammad Chhiddikur Rahman ,&nbsp;Md. Rajib Sharker ,&nbsp;Md. Sabit Hasan","doi":"10.1016/j.rsma.2024.103855","DOIUrl":"10.1016/j.rsma.2024.103855","url":null,"abstract":"<div><div>Hilsa, the national fish of Bangladesh, contributes more than 12 % of the country's total fish production. Considering the species' importance, this study assessed the post-harvest loss (PHL) of Hilsa across the value chain. Data were collected at the landing and distribution chain from 200 fisherman, 40 aratdars (Aratdar-I), 40 wholesalers at landing sites of the Chandpur district, 40 aratdars (Aratdar-II), and 70 retailers at the distribution sites of the Jamalpur district. The results revealed 12.56 % post-harvest losses in the value chains, most of which were caused by quality losses (8.41 %). Along the value chain, fishermen faced the highest losses 5.291 %, followed by 3.813 % in the retailers. These findings suggest fishermen and retail markets are hotspots of spoilage and fish loss. The OLS regression model indicated that inappropriate age and lack of experience of stakeholders, prolonged harvesting time, inadequate washing facilities, fishermen small size group, longer distances between fishing locations and landing sites, lack of proper education and training, delaying auctioning, insufficient infrastructure facilities, longer selling time, and insufficient cooling facilities were the significant factors causing PHL in the value chain. Nutritional analysis revealed substantial changes across the value chain. Moisture content increased steadily, which accelerated the spoilage. A significant decrease in protein, lipid and ash indicated the substantial loss of nutrients after harvesting up to the retail market. Principal Component Analysis (PCA) for nutritional composition analyses demonstrated that after the catch, aratdar-I, and boat had higher nutrient levels, while aratdar-II, local wholesaler, and post-transportation had higher moisture and lower nutrient levels. The PC1 accounted 95.92 % of the variation, indicating that handling and storage had significant influences in maintaining nutritional quality. To reduce post-harvest losses, the government must implement standardized practices throughout the Hilsa value chain to ensure food security and sustainability in the Hilsa fishery and boost the economy.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103855"},"PeriodicalIF":2.1,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428202","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":"Prevalence and source of entanglements in Cape fur seals (Arctocephalus pusillus pusillus) in South Africa","authors":"M. Ramilo-Henry ,&nbsp;S.H. Elwen ,&nbsp;A. Barnes ,&nbsp;V. Ward ,&nbsp;T. Gridley","doi":"10.1016/j.rsma.2024.103850","DOIUrl":"10.1016/j.rsma.2024.103850","url":null,"abstract":"<div><div>Global pollution is increasing, and marine mammals are commonly affected by marine debris. This study combined data from multiple sources to help understand the prevalence, characteristics and demographic profile of Cape fur seals (<em>Arctocephalus pusillus pusillus</em>) entangled in anthropogenic items. Overall, 383 cases of entanglement in seals were identified with a regional prevalence for South Africa of 0.12 %, i.e., just over one in every thousand animals. Fishing materials were the primary cause of entanglements (70 %), with most entanglements observed on adults (n = 249, 65 %), particularly adult females (n = 95, 66 % of all sex-determined entangled seals). This study highlights the need for correct disposal of waste, particularly that derived from the fishing industry to mitigate the impact of marine pollution on the welfare and conservation of marine fauna in South Africa.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103850"},"PeriodicalIF":2.1,"publicationDate":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432500","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":"Assessment of heavy metal contamination and trophic status of coral reef sediments of the Lakshadweep Archipelago, Arabian Sea","authors":"E.R. Vignesh ,&nbsp;T.R. Gireeshkumar ,&nbsp;C.R. Emil John ,&nbsp;M.P. Jafna Binu ,&nbsp;K.S. Arya","doi":"10.1016/j.rsma.2024.103848","DOIUrl":"10.1016/j.rsma.2024.103848","url":null,"abstract":"<div><div>This study investigated the distribution, contamination status, and ecological implications of heavy metals in the Lakshadweep Archipelago corals and coral reef sediments and the role of labile organic matter on metal accumulation in sediments. Heavy metal concentrations were relatively higher in the inter-tidal sediments than in the lagoon and the corals. The geochemical indices generally indicated the low anthropogenic contribution of heavy metals in sediments, and according to the sediment quality guidelines, there are no adverse effects on the biota. Sedimentary biochemical constituents are dominated by carbohydrates (CHO) followed by Lipids (LPD) and Proteins (PRT), and the low values of PRT: CHO and LPD: CHO ratios indicated aged, refractory organic matter with low nutritional quality. A portion of CHO may be derived from terrestrial sources, and statistical analyses revealed that CHO and LPD are the potential carriers of toxic metals such as Cd, Co and As into the coral reef environment. The biota-sediment accumulation factor (BSAF) showed Cd as a macro concentrator and Zn, Ni, V and As as micro-macro concentrators in Lakshadweep corals.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103848"},"PeriodicalIF":2.1,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428197","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":"Vulnerability of elasmobranchs caught by artisanal fishery in the Southeastern Caribbean","authors":"Rafael Tavares ,&nbsp;Maria T. Carreon-Zapiain ,&nbsp;Juan Carlos Perez-Jimenez","doi":"10.1016/j.rsma.2024.103851","DOIUrl":"10.1016/j.rsma.2024.103851","url":null,"abstract":"<div><div>The Caribbean is recognized as one of the regions with significant elasmobranch diversity; however, the lack of scientific data has made it difficult to conduct traditional fish stock assessments. A Productivity Susceptibility Analysis (PSA) was used to evaluate the vulnerability of the most important elasmobranch species caught by artisanal fishery carried out in the northeastern region of Venezuela. The fishing database created by the INIA and CIT was used as a starting point to obtain catch composition, and biological and fishing information. Of the 37 elasmobranch species captured in the study area, 12 were selected for the PSA. Analysis indicated that the selected species, most of them small-sized sharks, had medium and high productivity; while all species evaluated showed high susceptibility to artisanal fishing. Among the elasmobranch species with high vulnerability, seven of them comprised five sharks (<em>C. limbatus</em>, <em>R. lalandii</em>, <em>R. porosus</em>, <em>C. brevipinna</em> and <em>C. acronotus</em>) and two batoids (<em>H. guttatus</em> and <em>A. narinari</em>). Elasmobranchs species with medium vulnerability included two sharks (<em>M. higmani</em> and <em>M. minicanis</em>) and one batoid (<em>H. americanus</em>); while those with low vulnerability comprised two shark species (<em>M canis</em> and <em>M. norrisi</em>). In the study area, elasmobranch fishing has been carried out for decades without effective management strategies, and the artisanal fishery poses a potential threat to the populations of this group of fish. The species identified in this study as having high vulnerability or risk should be immediately prioritised for serious management by the national agencies responsible for fishing administration.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103851"},"PeriodicalIF":2.1,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428203","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":"Risk assessment of heavy metals (Zn, Cu, Pb, and Ni) in the edible tissue of Oncorhynchus mykiss trout in the rivers of the southern Caspian Sea and the northern and southeast coast of Iran","authors":"Sanaz Khammar ,&nbsp;Reza Dahmardeh Behrooz ,&nbsp;Paromita Chakraborty ,&nbsp;Najme Zeinalipour","doi":"10.1016/j.rsma.2024.103849","DOIUrl":"10.1016/j.rsma.2024.103849","url":null,"abstract":"<div><div>The study aims to monitor and compare the concentration of heavy metals viz., zinc, copper, lead and nickel in the edible tissue of <em>Oncorhynchus mykiss</em> trout in the southern coast of Caspian Sea and the rivers of Khash city in the north-southeast coast of Iran. The average concentrations of zinc, copper, lead and nickel for the Stations in the north of Iran and the southeast of Iran were found 10.1, 8.1, 5.9, 4.7 and 6.5, 6.1, 3.5, 3.2 μg/g dry weight, respectively. Lead exceeded was the recommended standard limits by WHO, FAO, NHMRC, EC and UKMAFF. Based on the results, the average nickel metal was higher than the allowed concentration of international standards in all the studied stations, which indicates that more control should be done on the sources producing this metal around the target areas. furthermore, the daily intake (EDI) of the studied metals in all age groups were lower than the reference dose determined by the EPA organization and the tolerable intake (TI) provided by the FAO/WHO organization. The lowest frequency of daily consumption of <em>Oncorhynchus mykiss</em> was reported for the group of adult males and based on nickel metal (1.67 μg/g) and lead metal (1.14 μg/g) in the rivers located in the south of the Caspian Sea and the rivers of Khash city located in the southeast of Iran, respectively. The risk potential and risk index for non-cancerous diseases for all age groups in the muscle tissue of this fish was less than one, which shows that the consumption of this type of fish for human consumption will not cause a problem from the point of view of health and public health. However, management measures are necessary to prevent and control pollutants, especially in the southern shores of the Caspian Sea.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"79 ","pages":"Article 103849"},"PeriodicalIF":2.1,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428205","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}