Regional Studies in Marine Science最新文献

{"title":"Tracing pollution legacies in the Suances Estuary (N Spain): Challenges for dating methods and ecological recovery after mine closure","authors":"María Jesús Irabien ,&nbsp;Alejandro Cearreta ,&nbsp;José Gómez-Arozamena ,&nbsp;Ane García-Artola ,&nbsp;Humberto Serrano-García ,&nbsp;Jon Gardoki","doi":"10.1016/j.rsma.2025.104511","DOIUrl":"10.1016/j.rsma.2025.104511","url":null,"abstract":"<div><div>Estuaries are globally threatened ecosystems, requiring urgent assessment of their historical deterioration and recovery processes to inform realistic strategies for sustainable management. This study employs an integrated, multidisciplinary approach, including analyses of trace metals, foraminifera, and radionuclides in surface samples and short (47 cm) sediment cores, to evaluate the environmental evolution of the heavily polluted Suances Estuary (N Spain) and its response to the cessation in 2003 of historical mining activities of one of Europe’s largest carbonate-hosted Pb-Zn ores, the Reocín metalliferous deposits. Core samples showed elevated concentrations of Zn (maximum value &gt;10,000 mg kg⁻¹), Pb (max. 2700 mg kg⁻¹), Cd (35.3 mg kg⁻¹), and Hg (41 mg kg⁻¹), exceeding local background values and often surpassing Sediment Quality Guidelines. Despite an overall decrease in metal concentrations from surface samples between 2003 (max. value of Zn: 11,200 mg kg⁻¹; Pb: 2200 mg kg⁻¹; Cd: 26.4 mg kg⁻¹) and 2022 (max. value of Zn: 8520 mg kg⁻¹; Pb: 990 mg kg⁻¹; Cd: 20.5 mg kg⁻¹), significant spatial variations suggest sediment redistribution within the estuary. Moreover, foraminiferal abundances remain extremely low (range of standing crops: 1–510 individuals per 80 cm³), indicating persistent unfavorable environmental conditions for life and reproduction. Abnormal ²¹⁰Pb_xs signals in the sedimentary record unveil the impact of anthropogenic events related to the development and subsequent abandonment of mining activities. These findings underscore the complexity of sediment chronologies and environmental responses in historically contaminated estuarine systems, highlighting the need for long-term monitoring programs within a multidisciplinary framework.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"91 ","pages":"Article 104511"},"PeriodicalIF":2.4,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159534","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":"Health risk and ecological assessment of potentially toxic elements in seawater along the Betoya Bay coastline, Morocco","authors":"Rihab Ben-tahar ,&nbsp;Oualid Boukich ,&nbsp;Mohammed Mahjoub ,&nbsp;Mohamed Brahmi ,&nbsp;Mashail N. Alzain ,&nbsp;Omar Noman ,&nbsp;Fahd A. Nasr ,&nbsp;Bouchra El guerrouj ,&nbsp;Youssef Smiri","doi":"10.1016/j.rsma.2025.104516","DOIUrl":"10.1016/j.rsma.2025.104516","url":null,"abstract":"<div><div>Betoya Bay, located on the Moroccan coast of the Mediterranean Sea, is a strategically important ecosystem that was significantly impacted by port development, fishing activities, and rapid urbanization. Due to the importance of the Mediterranean Sea in maritime commerce and its increased vulnerability to pollution, the quality of Betoya Bay’s waters is a major international concern. This study examined potentially toxic elements (PTEs) contamination in seawaters of Betoya Bay by collecting samples from five representative sites over the year. PTE concentrations were analyzed, water quality was assessed using ecological indices, and risks to human health were evaluated. The average concentrations (µg/L) were as follows: Zn (166.65) &gt; Pb (24.14) &gt; As (19.71) &gt; Co (8.59) &gt; Cd (3.92) &gt; Cu (3.39) &gt; Cr (0.17) &gt; Ni (&lt;DL). The heavy metal evaluation index (HEI), heavy metal pollution index (HPI), and total potential ecological risk index (PER) showed low contamination, with values ranging from 0.004 to 0.020, 0.030–0.261, and 24.43–104.32, respectively. In contrast, water quality index (WQI) showed low to moderate contamination, with values ranging from 0.48 to 2.44. Human health risk analysis revealed a total hazard quotient (THQ) below 1, indicating negligible non-carcinogenic risk. Additionally, total carcinogenic risk (TCR) values remained below the acceptable threshold (&lt;10⁻⁶), confirming tolerable exposure. Statistical analysis revealed multiple sources of pollution, suggesting a combination of anthropogenic and natural inputs. Although the results indicate low contamination and limited health risks for affected populations, it is essential to ensure continuous surveillance of water quality. Persistent anthropogenic inputs and accumulation of PTE in the environment could increase pressure on marine ecosystems and pose long-term risks to human health. Therefore, sustainable management strategies and regular monitoring programs must be implemented to anticipate these developments and preserve the ecological functionality and socioeconomic benefits of Betoya Bay.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"91 ","pages":"Article 104516"},"PeriodicalIF":2.4,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222236","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":"Complexity analysis of navigation situation of intelligent ships in port area with multi-factor coupling","authors":"Kai Feng ,&nbsp;Junlin Li ,&nbsp;Tinglin Chen ,&nbsp;Xiaoyuan Wang ,&nbsp;Jingheng Wang ,&nbsp;Longfei Chen ,&nbsp;Quanzheng Wang ,&nbsp;Cheng Shen ,&nbsp;Yabin Li ,&nbsp;Yuhan Jiang","doi":"10.1016/j.rsma.2025.104503","DOIUrl":"10.1016/j.rsma.2025.104503","url":null,"abstract":"<div><div>Accurate analysis of navigation complexity for ships in the busy port areas is crucial for ensuring safety and efficiency. However, there is a lack of an effective method to analyze the navigation situation in the port areas from the perspective of the coupling of multiple influencing factors. Therefore, a multi-factor coupled navigation situation complexity analysis method for unmanned ships is proposed in this paper. Firstly, the factors affecting ship navigation in port areas are considered comprehensively, and a coupled evaluation system is established. Secondly, the coupling coordination degree model is developed to quantify the interaction intensity between the influencing factors. Thirdly, the key interest perception region is abstracted as nodes, the coupling effect granularity is mapped to edge weights, and a complex network model of situation interaction is established. Finally, the method is validated using historical data, and the results show that the proposed model overcomes the limitations of traditional single-factor analysis, effectively identifies navigation influence areas with high coupling effects, determines the priorities of navigation areas of concern, and reveals their significant impact on ship safety.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"91 ","pages":"Article 104503"},"PeriodicalIF":2.4,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159735","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":"Horizontal distribution and abundance of red seabream (Pagrus major) in the East China Sea and Sea of Japan based on standardized catch per unit effort","authors":"Seiji Ohshimo,&nbsp;Takahito Masubuchi,&nbsp;Shintaro Gomi ,&nbsp;Takeshi Sakai,&nbsp;Tomoaki Iseki","doi":"10.1016/j.rsma.2025.104513","DOIUrl":"10.1016/j.rsma.2025.104513","url":null,"abstract":"<div><div>Red seabream (<em>Pagrus major</em>) is an important fisheries species in Japan, where it has been managed since 2025. Accurate stock assessment is necessary for rational fisheries management, and catch per unit effort (CPUE) is one of the key indexes used for this purpose. In the present study, the CPUE of red seabream in the East China Sea and Sea of Japan was standardized by incorporating seawater temperature and salinity based on fishing data obtained from bottom trawlers operating in key fishing grounds in these regions. We used data from operation reports available from 1982 to 2022, including fishing positions and efforts during each cruise and incorporated temperature and salinity data into the model from 1993. We applied a delta log-normal model for CPUE standardization and revealed an increase in this index since the early 1990s. We examined the horizontal distribution patterns of red seabream in each fishery grid that is 30 × 30 min latitude and longitude, and observed that the high-CPUE area extended northeastward from Taiwan to Japan along the shelf edge, which corresponds to the main fishing grounds covered by Japanese fleets after 2000. The probability of presence of red seabream increased drastically when water temperature at a depth of 50 m exceeded 15 °C. The reasons for the observed stock fluctuations may be a reduction in fishing pressure and warming seawater temperature.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"91 ","pages":"Article 104513"},"PeriodicalIF":2.4,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222233","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":"Seasonal trends in uranium distributions of two Florida rivers: Influence of geology and hydrology","authors":"Kelly A. Deister,&nbsp;Allison Patys","doi":"10.1016/j.rsma.2025.104510","DOIUrl":"10.1016/j.rsma.2025.104510","url":null,"abstract":"<div><div>Uranium (U) is commonly associated with carbonate bedrock and phosphate deposits, both of which can be found within Florida. Much of central Florida's land is mined for phosphate to produce fertilizer, resulting in elevated U levels in local water bodies, although causes for any temporal trends are not well understood. Seasonal U distributions in the Alafia and Hillsborough Rivers, which contribute to the Tampa Bay estuary, were evaluated by collecting water samples in the wet season (May to July 2022), the hurricane season (October to November 2022), and the dry season (January to March 2023). These rivers had U concentrations (0.8 – 12.5 nM) up to nine times greater than the global average concentration for rivers and estuaries. Located closer to the phosphate deposits, the Alafia River had higher U and phosphorus (P) concentrations than the Hillsborough River during all seasons, while both rivers had similar calcium (Ca) concentrations. On the Alafia River, U was strongly correlated with both P (r = 0.80, p &lt; 0.001) and Ca (r = 0.85, p &lt; 0.001) due to the phosphate deposits and carbonate bedrock. On the Hillsborough River, U was more strongly correlated with Ca (r = 0.86, p &lt; 0.001) than P (r = 0.43, p &lt; 0.001) likely due to the influence during the dry season of groundwater flow from Sulphur Springs. These correlations were skewed by data from the hurricane season when U and Ca concentrations were low, but P concentrations were high as a result of increased fertilizer runoff. Overall, this study reveals that U concentrations in Tampa Bay are primarily controlled by the underlying geology, but the local rainfall has a strong influence as well.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"91 ","pages":"Article 104510"},"PeriodicalIF":2.4,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159703","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":"Exploring litter dynamics as indicator of forest recovery in mangrove-recolonized abandoned ponds","authors":"Precious B. Jacob,&nbsp;Severino III G. Salmo","doi":"10.1016/j.rsma.2025.104509","DOIUrl":"10.1016/j.rsma.2025.104509","url":null,"abstract":"<div><div>Aquaculture is the primary driver of mangrove loss in Southeast Asia. Across the region (in the Philippines in particular), most of these ponds are now abandoned and unproductive. Natural mangrove recolonization, post-pond abandonment, is possible, but its potential for mangrove restoration is often overlooked. Knowledge on the recovery (e.g. forest productivity) of recolonized stands is scarce. This study assessed the recovery potential of mangrove-recolonized ponds using litter dynamics as indicator. Litter is a major contributor to forest productivity in mangrove ecosystems. Rates of litter production and decay in mangrove-recolonized fishponds and natural stands (as a chronosequence of different age cohorts) in Oriental Mindoro, Philippines were compared. Production and decay were measured through the litter trap method and the litter bag experiment, respectively. Results indicate that the rates of litter production in natural mangroves (50- and 90-year-old) are two (9.10 ± 2.42 Mg/ha/year) to three (12.40 ± 2.30 Mg/ha/year) times higher than the recolonized ponds (10-year-old, 3.95 ± 0.80 Mg/ha/year). However, comparable rates were recorded between the 30-year-old recolonized ponds (8.86 ± 1.95 Mg/ha/year) and the 50-year-old natural stand. Decay rates between stand types were not significantly different (0.37 ± 0.03 g/day). This indicates that despite existing poor conditions from previous pond operations, naturally recolonized ponds can recover productivity and thus can regain ecosystem functionality. Ignoring or delaying the rehabilitation of abandoned ponds is a lost opportunity for recovering mangrove ecosystem services (e.g., carbon sequestration). Thus, prioritizing mangrove restoration in abandoned ponds is recommended in the Philippines.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"91 ","pages":"Article 104509"},"PeriodicalIF":2.4,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159537","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-temporal distribution and polymer characterization of microplastics in surface waters of Lake Singkarak (Solok Region, Indonesia): A baseline study","authors":"Deswati Deswati ,&nbsp;Olly Norita Tetra ,&nbsp;Muhammad Rofii Ahzammi ,&nbsp;Amelia Sriwahyuni Lubis ,&nbsp;Suparno Suparno","doi":"10.1016/j.rsma.2025.104508","DOIUrl":"10.1016/j.rsma.2025.104508","url":null,"abstract":"<div><div>Microplastics (MPs) are emerging pollutants of global concern, yet their distribution in tropical freshwater ecosystems remains poorly understood. This study presents the first comprehensive assessment of MP occurrence in the surface waters of Lake Singkarak, a nationally strategic ecosystem and habitat for endemic fish species. Surface water samples were collected from five monitoring stations (S1–S5) during both rainy and dry seasons. MPs were widely distributed across all stations, with average concentrations ranging from 250 to 1200 particles L⁻¹ , and abundance was generally higher during the rainy season, particularly at sites influenced by domestic activities, aquaculture, and agriculture. Station S2 (Muaro Paninggahan) exhibited the highest seasonal increase (≈1000 %), while stations with minimal anthropogenic influence (S4 and S5) showed comparatively smaller variations (28–67 %). Fragments dominated MP morphology, and polyamide (PA) and polyethylene terephthalate (PET) were the most frequently detected polymers, suggesting significant contributions from domestic waste, aquaculture operations, and agricultural runoff. Although spatiotemporal variations were apparent, statistical analyses indicated no significant seasonal differences (p &gt; 0.05), highlighting the influence of localized environmental factors, such as hydrodynamics and human activity, on MP distribution. These findings underscore the urgent need for targeted pollution control, improved waste management, and long-term monitoring to safeguard the ecological integrity and socio-economic value of Lake Singkarak.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"91 ","pages":"Article 104508"},"PeriodicalIF":2.4,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The reproductive ecology of Loligo squids (Cephalopoda: Myopsida) in Lusitanian zoogeographical province","authors":"Vladimir Laptikhovsky ,&nbsp;Ana Moreno ,&nbsp;Daniel Oesterwind ,&nbsp;Catalina Perales-Raya ,&nbsp;Graham Pierce ,&nbsp;Jean-Paul Robin ,&nbsp;Ignacio Sobrino ,&nbsp;Maria Valls ,&nbsp;Roger Villanueva ,&nbsp;Athena Allen ,&nbsp;Esther Abad ,&nbsp;Giambattista Bello ,&nbsp;Bianca Tanja Carina Bobowski ,&nbsp;Fernando Ángel Fernández-Álvarez ,&nbsp;Miguel Cabanellas-Reboredo ,&nbsp;Ángel F. González ,&nbsp;Jorge Hernández-Urcera ,&nbsp;Svjetlana Krstulović Šifner ,&nbsp;Evgenia Lefkaditou ,&nbsp;Eleanor MacLeod ,&nbsp;Anne Marie Power","doi":"10.1016/j.rsma.2025.104506","DOIUrl":"10.1016/j.rsma.2025.104506","url":null,"abstract":"<div><div>Analysis of the temporal and spatial distribution of 686 records of egg masses and egg mass groups from (i) recreational divers and posted in the various public media, (ii) scientific survey data collected during research programs and (iii) publications in peer-reviewed literature plus published and unpublished information on the seasonality of the occurrence of mature females, demonstrated that the reproduction of <em>Loligo</em> squids occurs throughout the Lusitanian zoogeographical province all year round with varying seasonal peaks. This may be due to high phenotypic plasticity, with the life cycle adapting to local conditions, or the existence of small discrete stock units related to individual water features. In warmer and relatively productive waters the spawning peak is more extended, and percentage of mature females in catches is lower In the Mediterranean the peak of occurrence of both mature females and spawned eggs gradually shifts to earlier dates from the west to the east, which is consistent with respective changes of the earlier peak of productivity. There is little or no gap between peak of occurrence of mature females and peak of the egg mass records. Spawning grounds of <em>L. vulgaris</em> extend in the Mediterranean area much deeper than thought before and they extend from 3 m to 550 m. Egg masses were reported by recreational scuba divers from deeper locations in the central Mediterranean than in other areas. <em>Loligo forbesii</em> egg masses were found between 170 and 720 m.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"91 ","pages":"Article 104506"},"PeriodicalIF":2.4,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The abundance and characteristics of microplastics in different organs of both wild and farmed milkfish (Chanos chanos) from Madura, Indonesia","authors":"Sri Wahyu Imamah ,&nbsp;Agoes Soegianto ,&nbsp;Siti Arfa Jamlean ,&nbsp;Khairunnisak Khairunnisak ,&nbsp;Sucipto Hariyanto ,&nbsp;Carolyn Melissa Payus ,&nbsp;Nanik Retno Buwono ,&nbsp;Retno Hartati","doi":"10.1016/j.rsma.2025.104505","DOIUrl":"10.1016/j.rsma.2025.104505","url":null,"abstract":"<div><div>Microplastics (MPs), represent a significant global issue that endangers aquatic ecosystems. This study aims to analyze the abundance, physical characteristics (shape, color, and size), and types of polymers and chemical compounds in gills, stomach and intestines of milkfish from marine waters and ponds from Madura Indonesia. The Kruskal-Wallis test showed that MPs in milkfish gills and water from all of the locations were not statistically different, but MPs in the stomach and intestine differed. The Mann-Whitney test showed that milkfish from Camplong pond (PCM) had the most MPs in the stomach and intestine, while milkfish from Jrengik (PJM) pond and Camplong coastal water (CWM) had no significant difference. The fiber-shape MPs were the most abundant in all organs of milkfish and water. The black MPs were the most prevalent among all milkfish organs. The MPs measuring less than 500 µm were most abundant in milkfish organs and water across all locations. The increase in MPs abundance in aquatic environments was associated with higher concentrations of MPs in organs. The Spearman correlation test revealed no correlation between the abundance of MPs in milkfish organs and the length of milkfish across all locations. Seven MPs polymers were identified in various organs of milkfish and water: polyvinyl chloride, polystyrene, polyamide, polymethyl methacrylate, polyethylene terephthalate, polyethylene, and ethylene-vinyl acetate. The analysis of the gills, stomach and intestines of milkfish using gas chromatography-mass spectrometry identified the presence of plasticizers, stabilizers, lubricants, release agents, and various additives, such as octadecanoic acid, 1-hexadecanol, oleic acid, eicosane, and hexadecanoic acid.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"91 ","pages":"Article 104505"},"PeriodicalIF":2.4,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120027","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":"Distribution and morphology of the ampullae of Lorenzini in coastal and pelagic sharks from the Mexican Pacific","authors":"José Miguel Rangel-Morales ,&nbsp;Rosa Isabel Ochoa-Báez ,&nbsp;Julián René Torres-Villegas ,&nbsp;Felipe Galván-Magaña","doi":"10.1016/j.rsma.2025.104499","DOIUrl":"10.1016/j.rsma.2025.104499","url":null,"abstract":"<div><div>The electrosensory system in elasmobranchs is composed of specialized structures called the ampullae of Lorenzini, located in the anterior region of the head. These organs can detect weak electric fields. The electroreceptors are distributed in the dorsal and ventral cephalic skin and play a central role in prey detection. Their morphology, distribution, and density are primarily determined by phylogeny and are closely related to the species’ ecology. In the present study, we analyzed the abundance, spatial distribution, and histological features of the ampullae of Lorenzini in four shark species from in four shark species off the coast of Baja California Sur, Mexican Pacific. <em>Sphyrna zygaena</em>, exhibited the highest mean pore count (1938 ± 41.5), followed by <em>Mustelus henlei</em> (863 ± 22.15), <em>Prionace glauca</em> (790 ± 16.8), and <em>Isurus oxyrinchus</em> (438 ± 25.1). The ampullae exhibited variable morphology among species, with no evidence of cellular differentiation. Oceanic species (<em>P. glauca</em> and <em>I. oxyrinchus</em>) had fewer pores but larger ampullae compared with coastal species (<em>S. zygaena</em> and <em>M. henlei</em>). This study improves the knowledge of the electrosensory system by revealing variation in the distribution and morphology of these ampullae in sharks with different foraging strategies.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"91 ","pages":"Article 104499"},"PeriodicalIF":2.4,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119943","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}