Regional Studies in Marine Science最新文献

The effect of shoreline changes on the development of coastal tourism 岸线变化对滨海旅游发展的影响

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-08 DOI: 10.1016/j.rsma.2026.104847

Saidiksh Naik , Sourav Mandal , Jublee Mazumdar

The shoreline dynamics significantly influence the stability and growth of coastal tourism, particularly in areas where tourism is a primary economic driver. Present study evaluates shoreline changes along the Goan coast between 1995 and 2023 and their effects on coastal tourism. The study utilizes CoastSat, an open-source, Python-based framework integrated with Google Earth Engine (GEE) for shoreline extraction and subsequent tidal correction. Shoreline change rates are computed using digitized shore-normal transects, and a regression-based shoreline trend analysis was undertaken for 37 key beaches. A Digital Shoreline Analysis System (DSAS) uncertainty evaluation was performed for three representative sites (Keri, Baina, Caranzalem) to validate CoastSat-derived trends and incorporate confidence intervals for validation. The results indicate substantial spatial variability, with 26.37 % of the shoreline classified as stable, 9.24 % is undergoing erosion (e.g., Querim: −1.72 m/yr; Sinquerim: −1.36 m/yr), 8.55 % is accreting (e.g., Caranzalem: +3.65 m/yr; Baga: +1.49 m/yr), and 52.57 % of the coastline is comprised of rocky coast. Beaches such as Querim, Mandrem, Candolim, Anjuna, Sinquerim, Betalbatim, Varca, and Talpona are particularly susceptible to shoreline retreat, which might endanger the infrastructure supporting tourism. Additionally, to identify tourism pressure on erosive beaches, a spatial overlay study was conducted that integrated coastal shoreline trend with known tourism indicators (footfall, carrying capacity, available beach area, and shack density). However, beaches that are stable and accreting may provide chances for controlled tourism growth. The results provide clear guidance for coastal management by identifying tourism hotspots affected by erosion and areas suitable for controlled, sustainable tourism development.

海岸线动态显著影响沿海旅游业的稳定和增长，特别是在旅游业是主要经济驱动力的地区。本研究评估了1995年至2023年间果阿海岸的海岸线变化及其对沿海旅游业的影响。该研究利用了海岸卫星，这是一个基于python的开源框架，与谷歌地球引擎（GEE）集成在一起，用于海岸线提取和随后的潮汐校正。岸线变化率利用数字化的岸线正常样线计算，并对37个主要海滩进行了基于回归的岸线趋势分析。对三个代表性地点（Keri、Baina、Caranzalem）进行了数字海岸线分析系统（DSAS）不确定性评估，以验证海岸卫星得出的趋势，并纳入可信区间进行验证。结果表明：26.37 %的海岸线为稳定，9.24 %的海岸线为侵蚀（例如，Querim: - 1.72 m/yr; Sinquerim: - 1.36 m/yr）， 8.55 %的海岸线为侵蚀（例如，Caranzalem: +3.65 m/yr; Baga: +1.49 m/yr）， 52.57 %的海岸线由岩石海岸组成。Querim、Mandrem、Candolim、Anjuna、Sinquerim、Betalbatim、Varca和Talpona等海滩特别容易受到海岸线退缩的影响，这可能危及支撑旅游业的基础设施。此外，为了确定侵蚀海滩的旅游压力，进行了空间覆盖研究，将海岸岸线趋势与已知的旅游指标（人流量、承载能力、可用海滩面积和棚屋密度）相结合。然而，稳定和不断增长的海滩可能为有控制的旅游业增长提供机会。研究结果通过识别受侵蚀影响的旅游热点和适合可控、可持续旅游发展的地区，为沿海管理提供了明确的指导。

{"title":"The effect of shoreline changes on the development of coastal tourism","authors":"Saidiksh Naik , Sourav Mandal , Jublee Mazumdar","doi":"10.1016/j.rsma.2026.104847","DOIUrl":"10.1016/j.rsma.2026.104847","url":null,"abstract":"<div><div>The shoreline dynamics significantly influence the stability and growth of coastal tourism, particularly in areas where tourism is a primary economic driver. Present study evaluates shoreline changes along the Goan coast between 1995 and 2023 and their effects on coastal tourism. The study utilizes CoastSat, an open-source, Python-based framework integrated with Google Earth Engine (GEE) for shoreline extraction and subsequent tidal correction. Shoreline change rates are computed using digitized shore-normal transects, and a regression-based shoreline trend analysis was undertaken for 37 key beaches. A Digital Shoreline Analysis System (DSAS) uncertainty evaluation was performed for three representative sites (Keri, Baina, Caranzalem) to validate CoastSat-derived trends and incorporate confidence intervals for validation. The results indicate substantial spatial variability, with 26.37 % of the shoreline classified as stable, 9.24 % is undergoing erosion (e.g., Querim: −1.72 m/yr; Sinquerim: −1.36 m/yr), 8.55 % is accreting (e.g., Caranzalem: +3.65 m/yr; Baga: +1.49 m/yr), and 52.57 % of the coastline is comprised of rocky coast. Beaches such as Querim, Mandrem, Candolim, Anjuna, Sinquerim, Betalbatim, Varca, and Talpona are particularly susceptible to shoreline retreat, which might endanger the infrastructure supporting tourism. Additionally, to identify tourism pressure on erosive beaches, a spatial overlay study was conducted that integrated coastal shoreline trend with known tourism indicators (footfall, carrying capacity, available beach area, and shack density). However, beaches that are stable and accreting may provide chances for controlled tourism growth. The results provide clear guidance for coastal management by identifying tourism hotspots affected by erosion and areas suitable for controlled, sustainable tourism development.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104847"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147422195","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}

引用次数: 0

Regional differences in microplastic accumulation in the thornback ray (Raja clavata) along the southern Black Sea coast 黑海南部海岸刺背鳐（拉贾·克拉瓦塔）中微塑料积累的区域差异

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-14 DOI: 10.1016/j.rsma.2026.104856

Ahmet Raif Eryaşar , Tanju Mutlu , Murat Dağtekin , Özcan Kaygusuz , Kenan Gedik

Microplastic (MP) pollution is an emerging global concern with potential ecological and human health consequences, yet data on its impacts in demersal cartilaginous fishes remain scarce. This study presents the first assessment of MP ingestion in the thornback ray (Raja clavata) specifically focusing on the southern Black Sea coast. A total of 68 individuals collected from 23 stations were examined, yielding 196 MP particles. The mean abundance was 2.88 MPs per individual, with significantly higher values in the eastern Black Sea compared to the western region (Mann–Whitney U, p = 0.036). Fibers dominated the morphological categories (>80 %), while PET and PP were the most prevalent polymer types, and black and blue were the dominant colors. The eastern coast exhibited greater polymer and color diversity, which suggests a potential association with heterogeneous land-based inputs. No significant correlations were found between MP abundance and fish length, weight, or sampling depth. These findings highlight spatial heterogeneity in MP contamination, emphasizing areas of accumulation consistent with regional riverine discharges and coastal pressures. The results highlight the potential importance of targeting land-based sources to support conservation efforts in sensitive marine ecosystems.

微塑料污染是一个新兴的全球性问题，具有潜在的生态和人类健康后果，但关于其对底栖软骨鱼影响的数据仍然很少。本研究首次评估了刺背鳐（拉贾克拉瓦塔）的MP摄入情况，特别关注黑海南部海岸。从23个站点收集的68个个体进行了检查，产生了196mp颗粒。平均丰度为2.88 MPs /个体，黑海东部的丰度显著高于西部地区（Mann-Whitney U, p = 0.036）。纤维在形态类别中占主导地位（>80 %），而PET和PP是最常见的聚合物类型，黑色和蓝色是主要颜色。东部沿海表现出更大的聚合物和颜色多样性，这表明与异质陆地输入的潜在关联。MP丰度与鱼的长度、重量或取样深度之间没有发现显著的相关性。这些发现突出了多聚污染物的空间异质性，强调了与区域河流排放和沿海压力一致的累积区域。研究结果强调了以陆地资源为目标支持敏感海洋生态系统保护工作的潜在重要性。

{"title":"Regional differences in microplastic accumulation in the thornback ray (Raja clavata) along the southern Black Sea coast","authors":"Ahmet Raif Eryaşar , Tanju Mutlu , Murat Dağtekin , Özcan Kaygusuz , Kenan Gedik","doi":"10.1016/j.rsma.2026.104856","DOIUrl":"10.1016/j.rsma.2026.104856","url":null,"abstract":"<div><div>Microplastic (MP) pollution is an emerging global concern with potential ecological and human health consequences, yet data on its impacts in demersal cartilaginous fishes remain scarce. This study presents the first assessment of MP ingestion in the thornback ray (<em>Raja clavata</em>) specifically focusing on the southern Black Sea coast. A total of 68 individuals collected from 23 stations were examined, yielding 196 MP particles. The mean abundance was 2.88 MPs per individual, with significantly higher values in the eastern Black Sea compared to the western region (Mann–Whitney U, <em>p</em> = 0.036). Fibers dominated the morphological categories (>80 %), while PET and PP were the most prevalent polymer types, and black and blue were the dominant colors. The eastern coast exhibited greater polymer and color diversity, which suggests a potential association with heterogeneous land-based inputs. No significant correlations were found between MP abundance and fish length, weight, or sampling depth. These findings highlight spatial heterogeneity in MP contamination, emphasizing areas of accumulation consistent with regional riverine discharges and coastal pressures. The results highlight the potential importance of targeting land-based sources to support conservation efforts in sensitive marine ecosystems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104856"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147422197","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}

引用次数: 0

Upwelling as a nursery for fish larvae: Summer observations from the Taiwan Bank 上升流作为鱼苗的苗圃：台湾浅滩夏季观测

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-04 DOI: 10.1016/j.rsma.2026.104831

Yu-Hsuan Sun , Yi-Chen Wang , Ling-Hsuan Hsu , Pei-Jie Meng , Hung-Yen Hsieh

The present study investigated the impact of upwelling on the hydrographic conditions and fish larvae assemblages around the Taiwan Bank. In July 2023, a total of 2061 fish larvae were collected, representing 130 species from 61 families and 99 genera, identified through DNA barcoding. The dominant taxa included Bleekeria mitsukurii, Lactarius lactarius, Sillago ingenuua, Encrasicholina heteroloba, and Selaroides leptolepis. At central region of the bank, a low-temperature, high-salinity water mass extended toward the surface, delineating the principal upwelling zone. Within this region, elevated fluorescence and zooplankton abundance created favorable breeding conditions for fish larvae. Cluster analysis revealed two distinct summer assemblage groups: (i) stations in the northern non-upwelling area and the central upwelling zone, and (ii) stations in the southern bank. Assemblages in the southern group were compositionally distinct from those in both the northern and central regions, largely due to the presence of mesopelagic larvae transported northward by the South China Sea Surface Current. We propose that the upwelling waters act as a barrier, limiting further northward dispersal of these mesopelagic larvae into the upwelling zone and adjacent shallow habitats.

摘要本研究以台湾浅滩为研究对象，探讨了上升流对台湾浅滩周边水文环境及鱼类幼鱼群的影响。2023年7月，通过DNA条形码技术共采集到61科99属130种的鱼类幼鱼2061条。优势类群有：mitsukuria Bleekeria、Lactarius Lactarius、silago ingenuua、Encrasicholina heteroloba和Selaroides leptolepis。在滩中央地区，一个低温、高盐度的水团向地表延伸，圈定了主要的上升流带。在这个区域内，荧光的增强和浮游动物的丰度为鱼类幼虫创造了有利的繁殖条件。聚类分析结果显示，夏季降水分布明显分为北部非上升流区和中部上升流区和南岸2个站点。南部群的组合在组成上与北部和中部地区不同，这主要是由于南海表面流向北输送的中远洋幼虫的存在。我们认为，上升流起到了屏障的作用，限制了这些中上层幼虫进一步向北扩散到上升流区和邻近的浅层栖息地。

{"title":"Upwelling as a nursery for fish larvae: Summer observations from the Taiwan Bank","authors":"Yu-Hsuan Sun , Yi-Chen Wang , Ling-Hsuan Hsu , Pei-Jie Meng , Hung-Yen Hsieh","doi":"10.1016/j.rsma.2026.104831","DOIUrl":"10.1016/j.rsma.2026.104831","url":null,"abstract":"<div><div>The present study investigated the impact of upwelling on the hydrographic conditions and fish larvae assemblages around the Taiwan Bank. In July 2023, a total of 2061 fish larvae were collected, representing 130 species from 61 families and 99 genera, identified through DNA barcoding. The dominant taxa included <em>Bleekeria mitsukurii</em>, <em>Lactarius lactarius</em>, <em>Sillago ingenuua</em>, <em>Encrasicholina heteroloba</em>, and <em>Selaroides leptolepis</em>. At central region of the bank, a low-temperature, high-salinity water mass extended toward the surface, delineating the principal upwelling zone. Within this region, elevated fluorescence and zooplankton abundance created favorable breeding conditions for fish larvae. Cluster analysis revealed two distinct summer assemblage groups: (i) stations in the northern non-upwelling area and the central upwelling zone, and (ii) stations in the southern bank. Assemblages in the southern group were compositionally distinct from those in both the northern and central regions, largely due to the presence of mesopelagic larvae transported northward by the South China Sea Surface Current. We propose that the upwelling waters act as a barrier, limiting further northward dispersal of these mesopelagic larvae into the upwelling zone and adjacent shallow habitats.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104831"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191136","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}

引用次数: 0

Manta and devil rays in the Canary Islands: What do we know? 加那利群岛的蝠鲼和魔鬼鱼：我们知道什么？

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-14 DOI: 10.1016/j.rsma.2026.104837

Alicia Rodríguez-Juncá , Ana F. Sobral , Guy M.W. Stevens

Understanding species diversity, occurrence, and anthropogenic interactions of mobulids (manta and devil rays) is essential for conservation of these threatened species. In the Canary Islands, we combined a literature review (140 records, 1836–2025), fishers interviews (n = 225), and citizen science sightings (n = 356) to establish the first mobulid baseline in this understudied region. Four species are confirmed: Mobula birostris, Mobula mobular, Mobula tarapacana, and the previously undocumented Mobula thurstoni. Historical context and corrected species misidentifications are provided. Thirty-five percent of fishers reported frequent mobulid sightings, whereas interactions were rare for depredation/ gear damage (70 %), and incidental captures (64 %). M. tarapacana is prevalent in western-central islands, M. birostris in eastern islands, and M. thurstoni in Gran Canaria. Mobula tarapacana was the most common species (60 %), present year-round, peaking from May to October. Large aggregations were documented for M. tarapacana (up to 56 individuals) and M. thurstoni (up to 18 individuals). Observations of juveniles (M. birostris and M. thurstoni), pregnant females (M. tarapacana and M. birostris), mating wounds (M. mobular) and scars (M. tarapacana), and courtship behavior (M. mobular) suggest the archipelago may provide an important reproductive habitat. Mobulids here face lower fishing pressure than in nearby African fishing grounds, yet evidence of occasional impacts—vessel strikes, entanglement, and potential habitat displacement—underscore the need for further research. These findings highlight the Canary Islands’ importance for multiple mobulid species, especially relevant in light of their global population declines.

了解流动动物（蝠鲼和魔鬼鱼）的物种多样性、发生和人为相互作用对保护这些濒危物种至关重要。在加那利群岛，我们结合文献综述（140条记录，1836-2025）、渔民访谈（n = 225）和公民科学目击（n = 356），在这个研究不足的地区建立了第一个生物基线。已确认的有四种：birostris孟布拉、mobular孟布拉、tarapacana孟布拉和以前未记载的thurstoni孟布拉。提供了历史背景和纠正的物种错误识别。35%的渔民报告了频繁的生物目击，而相互作用对于捕食/渔具损坏（70% %）和偶然捕获（64% %）来说是罕见的。M. tarapacana流行于中西部岛屿，M. birostris流行于东部岛屿，M. thurstoni流行于大加那利岛。塔拉帕卡纳（Mobula tarapacana）是最常见的种类（60 %），全年存在，5 - 10月为高峰。有大量的聚集记录的是塔拉帕卡纳白僵菌（多达56只）和瑟斯通白僵菌（多达18只）。对幼鱼（M. birostris和M. thurstoni）、怀孕雌鱼（M. tarapacana和M. birostris）、交配伤口（M. mobular）和疤痕（M. tarapacana）以及求偶行为（M. mobular）的观察表明，该群岛可能提供了一个重要的繁殖栖息地。这里的mobulid面临的捕捞压力比附近的非洲渔场要小，但偶尔会有影响的证据——船只撞击、缠结和潜在的栖息地移位——强调了进一步研究的必要性。这些发现突出了加那利群岛对多种流动物种的重要性，特别是考虑到它们的全球数量下降。

{"title":"Manta and devil rays in the Canary Islands: What do we know?","authors":"Alicia Rodríguez-Juncá , Ana F. Sobral , Guy M.W. Stevens","doi":"10.1016/j.rsma.2026.104837","DOIUrl":"10.1016/j.rsma.2026.104837","url":null,"abstract":"<div><div>Understanding species diversity, occurrence, and anthropogenic interactions of mobulids (manta and devil rays) is essential for conservation of these threatened species. In the Canary Islands, we combined a literature review (140 records, 1836–2025), fishers interviews (n = 225), and citizen science sightings (n = 356) to establish the first mobulid baseline in this understudied region. Four species are confirmed: <em>Mobula birostris</em>, <em>Mobula mobular</em>, <em>Mobula tarapacana</em>, and the previously undocumented <em>Mobula thurstoni</em>. Historical context and corrected species misidentifications are provided. Thirty-five percent of fishers reported frequent mobulid sightings, whereas interactions were rare for depredation/ gear damage (70 %), and incidental captures (64 %). <em>M. tarapacana</em> is prevalent in western-central islands, <em>M. birostris</em> in eastern islands, and <em>M. thurstoni</em> in Gran Canaria. <em>Mobula tarapacana</em> was the most common species (60 %), present year-round, peaking from May to October. Large aggregations were documented for <em>M. tarapacana</em> (up to 56 individuals) and <em>M. thurstoni</em> (up to 18 individuals). Observations of juveniles (<em>M. birostris</em> and <em>M. thurstoni)</em>, pregnant females (<em>M. tarapacana</em> and <em>M. birostris</em>), mating wounds (<em>M. mobular</em>) and scars (<em>M. tarapacana</em>), and courtship behavior (<em>M. mobular</em>) suggest the archipelago may provide an important reproductive habitat. Mobulids here face lower fishing pressure than in nearby African fishing grounds, yet evidence of occasional impacts—vessel strikes, entanglement, and potential habitat displacement—underscore the need for further research. These findings highlight the Canary Islands’ importance for multiple mobulid species, especially relevant in light of their global population declines.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104837"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147422946","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}

引用次数: 0

Spatiotemporal patterns of jellyfish distribution along the Maharashtra coast, India 印度马哈拉施特拉邦海岸水母分布的时空格局

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-20 DOI: 10.1016/j.rsma.2026.104869

M.R. Ashpel Mano , S. Ramkumar , Asha T. Landge , S. Abuthagir Iburahim , K. Nikhil , Sonam Angmo , Karankumar Ramteke , B.B. Nayak , Suryapraba V

Jellyfish aggregations have substantial ecological, economic, and societal impacts, yet their spatiotemporal dynamics are poorly understood in tropical regions. The present study assessed the distribution patterns and seasonal occurrence of jellyfish aggregations along the coast of Maharashtra, India, through fortnightly sampling across eleven sites from October 2023 to September 2024. Sample collection methods included the use of zooplankton nets, fishing gear, onboard sampling, and scuba observations. A total of ten jellyfish taxa were recorded, of which six were identified to species level namely, Chiropsoides buitendijki (van der Horst, 1907), Liriope tetraphylla (Chamisso & Eysenhardt, 1821), Physalia physalis (Linnaeus, 1758), Pleurobrachia pileus (O. F. Müller, 1776), Rhopilema hispidum (Vanhöffen, 1888), and Tripedalia cystophora Conant, 1897. While four taxa, namely Aequorea sp., Blackfordia sp., Chrysaora sp., and Turritopsis sp., could only be resolved to the genus level. Chrysaora sp. (70 % of the sites) was the most widespread taxon, with species diversity peaking during the pre-monsoon season (90 % of the species), particularly in the Palghar district (80 %). Non-metric multidimensional scaling indicated similarities in species composition between Mumbai and Sindhudurg districts. Findings underscore the variability of jellyfish aggregations along Maharashtra’s coast, with implications for fisheries management and opportunities for commercial exploitation of R. hispidum. Continued monitoring and strategic management are vital for mitigating adverse effects and exploring economic potential.

热带地区的水母聚集具有重要的生态、经济和社会影响，但其时空动态却鲜为人知。本研究通过2023年10月至2024年9月在11个地点每两周采样一次，评估了印度马哈拉施特拉邦沿海水母聚集的分布模式和季节性发生。样本收集方法包括使用浮游动物网、渔具、船上取样和水肺观察。共记录到10个水母分类群，其中6个已鉴定到种级，分别是Chiropsoides buitendijki （van der Horst, 1907）、Liriope tetraphylla （Chamisso & Eysenhardt, 1821）、Physalia physalis （Linnaeus, 1758）、Pleurobrachia pileus （o.f. m勒，1776）、Rhopilema hispidum （Vanhöffen, 1888）和Tripedalia cystophora Conant（1897）。而Aequorea sp.、Blackfordia sp.、Chrysaora sp.和Turritopsis sp.四个分类群只能在属水平上进行解析。Chrysaora sp.（占70% %）是分布最广的分类群，物种多样性在季风前季节达到高峰（占90% %），特别是在Palghar地区（占80% %）。非度量多维尺度表明孟买和辛杜古尔地区的物种组成相似。研究结果强调了马哈拉施特拉邦沿海水母聚集的可变性，这对渔业管理和商业开发海鞘海蜇的机会具有重要意义。持续的监测和战略管理对于减轻不利影响和探索经济潜力至关重要。

{"title":"Spatiotemporal patterns of jellyfish distribution along the Maharashtra coast, India","authors":"M.R. Ashpel Mano , S. Ramkumar , Asha T. Landge , S. Abuthagir Iburahim , K. Nikhil , Sonam Angmo , Karankumar Ramteke , B.B. Nayak , Suryapraba V","doi":"10.1016/j.rsma.2026.104869","DOIUrl":"10.1016/j.rsma.2026.104869","url":null,"abstract":"<div><div>Jellyfish aggregations have substantial ecological, economic, and societal impacts, yet their spatiotemporal dynamics are poorly understood in tropical regions. The present study assessed the distribution patterns and seasonal occurrence of jellyfish aggregations along the coast of Maharashtra, India, through fortnightly sampling across eleven sites from October 2023 to September 2024. Sample collection methods included the use of zooplankton nets, fishing gear, onboard sampling, and scuba observations. A total of ten jellyfish taxa were recorded, of which six were identified to species level namely, <em>Chiropsoides buitendijki</em> (van der Horst, 1907)<em>, Liriope tetraphylla</em> (Chamisso & Eysenhardt, 1821), <em>Physalia physalis</em> (Linnaeus, 1758), <em>Pleurobrachia pileus</em> (O. F. Müller, 1776), <em>Rhopilema hispidum</em> (Vanhöffen, 1888), <em>and Tripedalia cystophora</em> Conant, 1897. While four taxa, namely <em>Aequorea</em> sp., <em>Blackfordia</em> sp<em>.</em>, <em>Chrysaora</em> sp., <em>and Turritopsis</em> sp<em>.,</em> could only be resolved to the genus level. <em>Chrysaora</em> sp. (70 % of the sites) was the most widespread taxon, with species diversity peaking during the pre-monsoon season (90 % of the species), particularly in the Palghar district (80 %). Non-metric multidimensional scaling indicated similarities in species composition between Mumbai and Sindhudurg districts. Findings underscore the variability of jellyfish aggregations along Maharashtra’s coast, with implications for fisheries management and opportunities for commercial exploitation of <em>R. hispidum</em>. Continued monitoring and strategic management are vital for mitigating adverse effects and exploring economic potential.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104869"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147422965","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}

引用次数: 0

Fourier Transformed Infrared Spectroscopy-based macronutrients and mineral composition analysis of marine macroalgae of Visakhapatnam, Andhra Pradesh 基于傅里叶变换红外光谱的安得拉邦维萨卡帕特南海洋大型藻类大量营养元素和矿物组成分析

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-23 DOI: 10.1016/j.rsma.2026.104881

Tanushree Panigrahi , Moupriya Mukherjee , M. Palanisamy , Anima Sunil Dadhich , Goutam Pramanik

The present study comparatively investigates the biochemical functional groups of marine macroalgae belonging to the chlorophyta, phaeophyta, and rhodophyta, collected from the Rushikonda and Tenneti beach area of Visakhapatnam shore, Andhra Pradesh, India, using FTIR spectroscopy in 4000 – 400 cm⁻¹ range. FTIR analyses confirm the presence of proteins, polysaccharides, lipids and degree of sulfation in all the studied marine macroalgae. The hydrogen bonding among the polysaccharides in Ulva lactuca and Gracilaria foliifera is established through the shift of the O-H stretching frequency to a lower wavenumber. The intense C-H stretching vibration indicates a high amount of saturated fatty acids and polyunsaturated fatty acids present in brown macroalgae. The observation of S-O and C-O-S stretching indicates the sulfation of polysaccharides in all the macroalgae. The C-O-S bending vibration revealed that the sulfation occurs both in equatorial and axial positions in green macroalgae. In contrast, in the case of red macroalgae, Hypnea valentiae and Centroceras clavulatum, sulfation occurs mainly at the equatorial position. Besides FTIR, X-ray diffraction (2θ from 20º to 60º) and X-ray fluorescence helped to understand the mineral compositions in the macroalgae. The C-O stretching, out-of-plane C-O bending vibration of carbonate and powder XRD indicate Jania rubens contains Mg-calcite. The availability of carbonate ions in the red marine macroalgae points to the neutral pH of the seawater in the sampling region. Overall, our study demonstrates the FTIR is enough to reveals the functional groups and chemical structural variation in the various marine macroalgae, obtaining valuable insights into their ecological roles and contributions to the aquatic environment.

本文采用FTIR光谱对印度安得拉邦Visakhapatnam海岸的Rushikonda和Tenneti海滩地区的绿藻、照生藻和红藻的生物化学官能团进行了比较研究，光谱范围为4000 ~ 400 cm−1。FTIR分析证实，在所有研究的海洋大型藻类中都存在蛋白质、多糖、脂质和磺化程度。通过O-H拉伸频率向较低波数的偏移，建立了木耳多糖和江蓠多糖之间的氢键。强烈的C-H拉伸振动表明褐藻中存在大量的饱和脂肪酸和多不饱和脂肪酸。S-O和C-O-S拉伸的观察表明，所有大型藻类中多糖都发生了硫酸化。C-O-S弯曲振动表明，绿藻的硫酸化发生在赤道和轴向两个位置。与此相反，在红藻、叶青藻（Hypnea valentiae）和clavulatum中，硫酸化主要发生在赤道位置。除FTIR外，x射线衍射（2θ从20º到60º）和x射线荧光也有助于了解大型藻类的矿物组成。碳酸盐的C-O拉伸、面外C-O弯曲振动和粉末XRD表明，紫砂石中含有镁方解石。红色海洋巨藻中碳酸盐离子的可用性表明采样区域的海水pH值为中性。综上所述，我们的研究表明，FTIR足以揭示各种海洋大型藻类的官能团和化学结构变化，为其生态作用和对水生环境的贡献提供有价值的见解。

{"title":"Fourier Transformed Infrared Spectroscopy-based macronutrients and mineral composition analysis of marine macroalgae of Visakhapatnam, Andhra Pradesh","authors":"Tanushree Panigrahi , Moupriya Mukherjee , M. Palanisamy , Anima Sunil Dadhich , Goutam Pramanik","doi":"10.1016/j.rsma.2026.104881","DOIUrl":"10.1016/j.rsma.2026.104881","url":null,"abstract":"<div><div>The present study comparatively investigates the biochemical functional groups of marine macroalgae belonging to the chlorophyta, phaeophyta, and rhodophyta, collected from the Rushikonda and Tenneti beach area of Visakhapatnam shore, Andhra Pradesh, India, using FTIR spectroscopy in 4000 – 400 cm<sup>−1</sup> range. FTIR analyses confirm the presence of proteins, polysaccharides, lipids and degree of sulfation in all the studied marine macroalgae. The hydrogen bonding among the polysaccharides in <em>Ulva lactuca</em> and <em>Gracilaria foliifera</em> is established through the shift of the O-H stretching frequency to a lower wavenumber. The intense C-H stretching vibration indicates a high amount of saturated fatty acids and polyunsaturated fatty acids present in brown macroalgae. The observation of S-O and C-O-S stretching indicates the sulfation of polysaccharides in all the macroalgae. The C-O-S bending vibration revealed that the sulfation occurs both in equatorial and axial positions in green macroalgae. In contrast, in the case of red macroalgae, <em>Hypnea valentiae</em> and <em>Centroceras clavulatum</em>, sulfation occurs mainly at the equatorial position. Besides FTIR, X-ray diffraction (2θ from 20º to 60º) and X-ray fluorescence helped to understand the mineral compositions in the macroalgae. The C-O stretching, out-of-plane C-O bending vibration of carbonate and powder XRD indicate <em>Jania rubens</em> contains Mg-calcite. The availability of carbonate ions in the red marine macroalgae points to the neutral pH of the seawater in the sampling region. Overall, our study demonstrates the FTIR is enough to reveals the functional groups and chemical structural variation in the various marine macroalgae, obtaining valuable insights into their ecological roles and contributions to the aquatic environment.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104881"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147421808","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}

引用次数: 0

Marine mammals as global bioindicators of PFAS pollution: A review of advanced analytical methods and machine learning for source apportionment 海洋哺乳动物作为PFAS污染的全球生物指标：用于污染源分配的先进分析方法和机器学习综述

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-06 DOI: 10.1016/j.rsma.2026.104843

Xinrui Shen , Mingzhi Zhao , Wei Gao

Marine mammals have become critical bioindicators of global Per- and polyfluoroalkyl substances (PFAS) contamination due to their long lifespans, trophic positions, and transoceanic movements. Elevated PFAS burdens have been reported in several studies of Southern Hemisphere marine mammal species, despite the absence of large-scale local production. Such patterns likely reflect the combined influence of multiple processes, including inputs from regional activities, long-range oceanic transport, species-specific bioaccumulation, and current sampling constraints. We synthesize advances in extraction and analytical workflows, including Total Oxidizable Precursor (TOP) assay, Total Organic Fluorine (TOF) quantification, and high-resolution non-target screening, which expand the detectable PFAS spectrum. We further review recently published machine learning (ML)-enabled source apportionment approaches—such as Non-Negative Matrix Factorization (NMF) clustering, Principal Component Analysis (PCA)-Bayesian inference, and ionization efficiency prediction—which reconstruct complex PFAS mixtures and trace pollution origins. By linking oceanic transport processes with observed bioaccumulation patterns and computational analyses, we outline a unified monitoring framework that conceptualizes marine mammals as integrative chemical archives and early-warning indicators. The framework is intended to guide future PFAS surveillance and risk assessment, with its applicability shaped by ongoing advances in analytical standardization and data integration.

海洋哺乳动物由于其寿命长、营养地位高和跨洋运动，已成为全球全氟和多氟烷基物质（PFAS）污染的重要生物指标。尽管没有大规模的当地生产，但在南半球海洋哺乳动物物种的几项研究中报告了PFAS负担增加。这种模式可能反映了多种过程的综合影响，包括来自区域活动的投入、远距离海洋运输、特定物种的生物积累和当前采样限制。我们综合了提取和分析工作流程的进展，包括总氧化前体（TOP）测定，总有机氟（TOF）定量和高分辨率非靶标筛选，扩大了可检测的PFAS光谱。我们进一步回顾了最近发表的支持机器学习（ML）的源分配方法，如非负矩阵分解（NMF）聚类、主成分分析(PCA)-贝叶斯推理和电离效率预测，这些方法重建了复杂的PFAS混合物和痕量污染来源。通过将海洋运输过程与观察到的生物积累模式和计算分析联系起来，我们概述了一个统一的监测框架，将海洋哺乳动物概念化为综合化学档案和预警指标。该框架旨在指导未来的PFAS监测和风险评估，其适用性取决于分析标准化和数据集成方面的持续进展。

{"title":"Marine mammals as global bioindicators of PFAS pollution: A review of advanced analytical methods and machine learning for source apportionment","authors":"Xinrui Shen , Mingzhi Zhao , Wei Gao","doi":"10.1016/j.rsma.2026.104843","DOIUrl":"10.1016/j.rsma.2026.104843","url":null,"abstract":"<div><div>Marine mammals have become critical bioindicators of global Per- and polyfluoroalkyl substances (PFAS) contamination due to their long lifespans, trophic positions, and transoceanic movements. Elevated PFAS burdens have been reported in several studies of Southern Hemisphere marine mammal species, despite the absence of large-scale local production. Such patterns likely reflect the combined influence of multiple processes, including inputs from regional activities, long-range oceanic transport, species-specific bioaccumulation, and current sampling constraints. We synthesize advances in extraction and analytical workflows, including Total Oxidizable Precursor (TOP) assay, Total Organic Fluorine (TOF) quantification, and high-resolution non-target screening, which expand the detectable PFAS spectrum. We further review recently published machine learning (ML)-enabled source apportionment approaches—such as Non-Negative Matrix Factorization (NMF) clustering, Principal Component Analysis (PCA)-Bayesian inference, and ionization efficiency prediction—which reconstruct complex PFAS mixtures and trace pollution origins. By linking oceanic transport processes with observed bioaccumulation patterns and computational analyses, we outline a unified monitoring framework that conceptualizes marine mammals as integrative chemical archives and early-warning indicators. The framework is intended to guide future PFAS surveillance and risk assessment, with its applicability shaped by ongoing advances in analytical standardization and data integration.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104843"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191212","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}

引用次数: 0

Investigating the driving factors of marine litter and microplastic accumulation on beaches in the West of Ireland 调查爱尔兰西部海滩上海洋垃圾和微塑料堆积的驱动因素

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-07 DOI: 10.1016/j.rsma.2026.104827

Peter Dowling , Liwen Xiao , João Frias

Marine litter (ML) and microplastics (MPs) are contaminants of emerging concern threatening coastal ecosystems. This preliminary study assessed the accumulation of ML and MPs at two beaches (Fanore and Silverstrand beaches) on the West coast of Ireland, over three consecutive days in July 2024. Sampling was conducted along the spring and lower high tide lines (AC1 and AC2) and outside the accumulation area (OAC), following adapted OSPAR guidelines for marine litter. Marine litter items were categorised by type and size, while MPs were extracted from sediments and analysed using visual inspection and Fourier-Transform Infrared Spectroscopy (FTIR). Fanore consistently exhibited higher ML and MP accumulation compared to Silverstrand. While day variations in litter abundance were observed, statistical tests showed no statistical significant differences in total ML abundance or type distribution between beaches. Despite this, Fanore revealed a 48 % increase in ML accumulation overall. Microplastic concentrations were also significantly higher at Fanore, particularly in AC2. Ropes, fragments and fibres were the dominant litter and MP types, suggesting marine based-sources. Variability in MP concentrations, particularly at Fanore, reflects the influence of local geomorphology and hydrodynamics playing a more relevant role in accumulation. These preliminary findings underscore the need to assess accumulation rates while monitoring ML and MPs, particularly when reporting data for descriptor 10 of the Marine Strategy Framework Directive.

海洋垃圾（ML）和微塑料（MPs）是威胁沿海生态系统的新关注污染物。这项初步研究于2024年7月连续三天评估了爱尔兰西海岸两个海滩（Fanore和Silverstrand海滩）ML和MPs的积累情况。采样沿着春季和低潮线（AC1和AC2）以及堆积区（OAC）外进行，遵循经调整的OSPAR海洋垃圾指南。根据类型和大小对海洋垃圾进行分类，同时从沉积物中提取MPs，并使用目视检查和傅里叶变换红外光谱（FTIR）进行分析。与Silverstrand相比，Fanore始终表现出更高的ML和MP积累。虽然观察到凋落物丰度的日变化，但统计检验显示，不同海滩之间的ML总丰度或类型分布没有统计学显著差异。尽管如此，Fanore发现ML积累总体增加了48% %。Fanore的微塑料浓度也明显较高，尤其是AC2。绳索、碎片和纤维是主要的凋落物和MP类型，表明海洋来源。MP浓度的变化，特别是在Fanore，反映了当地地貌和水动力学在积累中起着更相关的作用。这些初步发现强调了在监测ML和MPs时评估累积率的必要性，特别是在报告海洋战略框架指令描述符10的数据时。

{"title":"Investigating the driving factors of marine litter and microplastic accumulation on beaches in the West of Ireland","authors":"Peter Dowling , Liwen Xiao , João Frias","doi":"10.1016/j.rsma.2026.104827","DOIUrl":"10.1016/j.rsma.2026.104827","url":null,"abstract":"<div><div>Marine litter (ML) and microplastics (MPs) are contaminants of emerging concern threatening coastal ecosystems. This preliminary study assessed the accumulation of ML and MPs at two beaches (Fanore and Silverstrand beaches) on the West coast of Ireland, over three consecutive days in July 2024. Sampling was conducted along the spring and lower high tide lines (AC1 and AC2) and outside the accumulation area (OAC), following adapted OSPAR guidelines for marine litter. Marine litter items were categorised by type and size, while MPs were extracted from sediments and analysed using visual inspection and Fourier-Transform Infrared Spectroscopy (FTIR). Fanore consistently exhibited higher ML and MP accumulation compared to Silverstrand. While day variations in litter abundance were observed, statistical tests showed no statistical significant differences in total ML abundance or type distribution between beaches. Despite this, Fanore revealed a 48 % increase in ML accumulation overall. Microplastic concentrations were also significantly higher at Fanore, particularly in AC2. Ropes, fragments and fibres were the dominant litter and MP types, suggesting marine based-sources. Variability in MP concentrations, particularly at Fanore, reflects the influence of local geomorphology and hydrodynamics playing a more relevant role in accumulation. These preliminary findings underscore the need to assess accumulation rates while monitoring ML and MPs, particularly when reporting data for descriptor 10 of the Marine Strategy Framework Directive.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104827"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191282","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}

引用次数: 0

Microplastic ingestion and trait-weighted ecological risk assessment framework for intertidal invertebrates of the Cox’s Bazar Coast, Bay of Bengal 孟加拉湾考克斯巴扎尔海岸潮间带无脊椎动物微塑料摄入及特征加权生态风险评估框架

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-12 DOI: 10.1016/j.rsma.2026.104850

Mahir Tajwar , Noushin Akter Tisha , Subrota Kumar Saha , Md Sahidul Islam

Microplastic pollution poses an increasing ecological threat to coastal ecosystems, yet organism-level exposure and risk in intertidal invertebrates from South Asia remain poorly documented. This study assesses MP ingestion and ecological risk across four major invertebrate groups (gastropods, bivalves, crabs, and barnacles) collected from 15 geo-referenced sites along the Cox’s Bazar coast, Bay of Bengal. A total of 132 MPs were recovered from invertebrate tissues, dominated by fibers (81 %), followed by fragments (14 %), films (4 %), and foams (1 %), with white and black particles most frequently observed. Fourier-transform infrared spectroscopy (FTIR) confirmed polyamide (48 %) and polyethylene (42 %) as the predominant polymers, with minor contributions from polypropylene and rare polyurethane. Multivariate analyses indicated consistent patterns linking fibrous morphotypes, dominant polymers, and specific invertebrate taxa, while spatial variation in MP burden was evident among sites. Ecological risk was evaluated using the Pollution Load Index (PLI), Polymer Hazard Index (PHI), and a newly developed Invertebrate Microplastic Hazard Index (IMHI), a trait-weighted framework integrating MP abundance, polymer hazard, and particle characteristics. Gastropods exhibited the highest MP burdens and associated risk scores, whereas crabs and barnacles showed lower but compositionally distinct exposures. Overall, the results highlight taxon-specific ingestion patterns and demonstrate the utility of a trait-weighted index as a screening tool for organism-level MP risk assessment in coastal ecosystems.

微塑料污染对沿海生态系统构成越来越大的生态威胁，但南亚潮间带无脊椎动物的生物水平暴露和风险仍然缺乏记录。本研究评估了从孟加拉湾考克斯巴扎尔海岸15个地理参考地点收集的四种主要无脊椎动物（腹足类、双壳类、螃蟹和藤壶）的MP摄入和生态风险。从无脊椎动物组织中共回收了132个MPs，以纤维（81 %）为主，其次是碎片（14 %）、薄膜（4 %）和泡沫（1 %），其中最常见的是白色和黑色颗粒。傅里叶变换红外光谱（FTIR）证实聚酰胺（48 %）和聚乙烯（42 %）是主要的聚合物，聚丙烯和稀有聚氨酯的贡献较小。多变量分析表明，纤维形态、优势聚合物和特定无脊椎动物类群之间存在一致的模式，而MP负荷在不同地点之间存在明显的空间差异。生态风险评估采用污染负荷指数（PLI）、聚合物危害指数（PHI）和新开发的无脊椎微塑料危害指数（IMHI）进行，IMHI是一个综合MP丰度、聚合物危害和颗粒特征的特征加权框架。腹足类动物表现出最高的MP负担和相关的风险评分，而螃蟹和藤壶表现出较低但成分不同的暴露。总体而言，结果突出了分类群特定的摄入模式，并证明了性状加权指数作为沿海生态系统中生物水平MP风险评估的筛选工具的实用性。

{"title":"Microplastic ingestion and trait-weighted ecological risk assessment framework for intertidal invertebrates of the Cox’s Bazar Coast, Bay of Bengal","authors":"Mahir Tajwar , Noushin Akter Tisha , Subrota Kumar Saha , Md Sahidul Islam","doi":"10.1016/j.rsma.2026.104850","DOIUrl":"10.1016/j.rsma.2026.104850","url":null,"abstract":"<div><div>Microplastic pollution poses an increasing ecological threat to coastal ecosystems, yet organism-level exposure and risk in intertidal invertebrates from South Asia remain poorly documented. This study assesses MP ingestion and ecological risk across four major invertebrate groups (gastropods, bivalves, crabs, and barnacles) collected from 15 geo-referenced sites along the Cox’s Bazar coast, Bay of Bengal. A total of 132 MPs were recovered from invertebrate tissues, dominated by fibers (81 %), followed by fragments (14 %), films (4 %), and foams (1 %), with white and black particles most frequently observed. Fourier-transform infrared spectroscopy (FTIR) confirmed polyamide (48 %) and polyethylene (42 %) as the predominant polymers, with minor contributions from polypropylene and rare polyurethane. Multivariate analyses indicated consistent patterns linking fibrous morphotypes, dominant polymers, and specific invertebrate taxa, while spatial variation in MP burden was evident among sites. Ecological risk was evaluated using the Pollution Load Index (PLI), Polymer Hazard Index (PHI), and a newly developed Invertebrate Microplastic Hazard Index (IMHI), a trait-weighted framework integrating MP abundance, polymer hazard, and particle characteristics. Gastropods exhibited the highest MP burdens and associated risk scores, whereas crabs and barnacles showed lower but compositionally distinct exposures. Overall, the results highlight taxon-specific ingestion patterns and demonstrate the utility of a trait-weighted index as a screening tool for organism-level MP risk assessment in coastal ecosystems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104850"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191281","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}

引用次数: 0

Spatio-temporal changes of Chlorophyll-a over the Eastern Mediterranean: Investigation of shipping, wildfires and dust events 东地中海地区叶绿素a的时空变化：航运、野火和沙尘事件的调查

IF 2.4 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2026-03-01 Epub Date: 2026-02-19 DOI: 10.1016/j.rsma.2026.104858

Muhittin Gunes Onay , Serra Saracoglu , Elif Pehlivanoglu , Burcak Kaynak

This study examines the effect of maritime activity, wildfires, and dust storms on phytoplankton growth and presents a comprehensive five-year spatio-temporal assessment of Chl-a levels across the study area covering the Sea of Marmara, the Aegean Sea, and the Eastern Mediterranean, including coastal and open sea areas. Investigations utilizing GCOM retrievals revealed areas and intervals of increased Chl-a levels. A novel quantitative method was developed to categorize open sea areas based on shipping intensity, demonstrating a significant association between high shipping activity and elevated Chl-a concentrations for the first time in the literature. The association was particularly remarkable during times of limited phytoplankton growth in the Eastern Mediterranean. In addition, three specific episodes focusing on one anthropogenic (shipping-livestock) and two natural sources (wildfire and dust) were selected for the investigation of high Chl-a concentrations in open sea. Dust episode exhibited the most widespread and intense Chl-a increase, followed by wildfire episode with lower Chl-a increase. On the other hand, livestock episode indicated more localized, but intense increases. These natural and anthropogenic factors elevated Chl-a levels compared to pre- and post-event periods. These findings underlined the crucial role of overlooked shipping activities on phytoplankton dynamics in open seas. Natural events such as wildfires and dust storms are anticipated to occur more frequently and severely in the Mediterranean due to climate change, highlighting the need for efforts to quantify and mitigate shipping activities that might contribute to algal blooms.

本研究考察了海洋活动、野火和沙尘暴对浮游植物生长的影响，并对整个研究区域（包括马尔马拉海、爱琴海和地中海东部，包括沿海和公海）的Chl-a水平进行了五年的时空综合评估。利用GCOM检索的调查显示了Chl-a水平升高的区域和间隔。我们开发了一种新的定量方法，根据航运强度对公海进行分类，首次在文献中证明了高航运活动与高Chl-a浓度之间的显著关联。在东地中海浮游植物生长有限的时期，这种联系尤为显著。此外，还选择了三个具体事件，重点是一个人为来源（船舶-牲畜）和两个自然来源（野火和灰尘），以调查公海高Chl-a浓度。沙尘期Chl-a增加范围最广、强度最大，其次是野火期，Chl-a增加幅度较小。另一方面，牲畜事件表明更局部但强烈的增加。与事件前后相比，这些自然和人为因素使Chl-a水平升高。这些发现强调了被忽视的航运活动对公海浮游植物动态的关键作用。由于气候变化，预计野火和沙尘暴等自然事件将在地中海更频繁、更严重地发生，这突出表明有必要努力量化和减轻可能导致藻华的航运活动。

{"title":"Spatio-temporal changes of Chlorophyll-a over the Eastern Mediterranean: Investigation of shipping, wildfires and dust events","authors":"Muhittin Gunes Onay , Serra Saracoglu , Elif Pehlivanoglu , Burcak Kaynak","doi":"10.1016/j.rsma.2026.104858","DOIUrl":"10.1016/j.rsma.2026.104858","url":null,"abstract":"<div><div>This study examines the effect of maritime activity, wildfires, and dust storms on phytoplankton growth and presents a comprehensive five-year spatio-temporal assessment of Chl-a levels across the study area covering the Sea of Marmara, the Aegean Sea, and the Eastern Mediterranean, including coastal and open sea areas. Investigations utilizing GCOM retrievals revealed areas and intervals of increased Chl-a levels. A novel quantitative method was developed to categorize open sea areas based on shipping intensity, demonstrating a significant association between high shipping activity and elevated Chl-a concentrations for the first time in the literature. The association was particularly remarkable during times of limited phytoplankton growth in the Eastern Mediterranean. In addition, three specific episodes focusing on one anthropogenic (shipping-livestock) and two natural sources (wildfire and dust) were selected for the investigation of high Chl-a concentrations in open sea. Dust episode exhibited the most widespread and intense Chl-a increase, followed by wildfire episode with lower Chl-a increase. On the other hand, livestock episode indicated more localized, but intense increases. These natural and anthropogenic factors elevated Chl-a levels compared to pre- and post-event periods. These findings underlined the crucial role of overlooked shipping activities on phytoplankton dynamics in open seas. Natural events such as wildfires and dust storms are anticipated to occur more frequently and severely in the Mediterranean due to climate change, highlighting the need for efforts to quantify and mitigate shipping activities that might contribute to algal blooms.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"95 ","pages":"Article 104858"},"PeriodicalIF":2.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147422284","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}

引用次数: 0