Marine environmental research最新文献

{"title":"PFAS-herbicide diflufenican reduces the photosynthetic capacity in seagrass (Zostera marina L.)","authors":"Viggo Klint Bastegaard,&nbsp;Kasper Elgetti Brodersen","doi":"10.1016/j.marenvres.2025.107342","DOIUrl":"10.1016/j.marenvres.2025.107342","url":null,"abstract":"<div><div>Global decline of seagrasses is directly linked with anthropogenic activities. One of the increasing threats, is marine pollution with a wide range of chemically synthesized substances. Here, we investigated effects of the commonly used PFAS-herbicide, diflufenican (DFF), on <em>Zostera marina</em> L. photobiology, over a 3-week exposure period, followed by 2-weeks of recovery. Measurements were conducted on seagrass leaves exposed to three different DFF concentrations (i.e., untreated, 0.015, 0.03 and 0.3 mg DFF L⁻¹). Photosynthesis and respiration rates, as a function of increasing photon scalar irradiance, were determined with the use of optical sensors measuring net gas exchange. Variable chlorophyll fluorescence imaging was used for determining the 2D photosynthetic capacity of the seagrass leaves. Photopigment concentrations in the seagrass leaves were quantified using HPLC-analysis. We show that DFF reduced the photosynthesis rates for plants exposed to 0.03 and 0.3 mg DFF L⁻¹ already after 1 week of exposure. While the imaging of photosynthetic capacity only showed a reduction for the highest DFF concentration (0.3 mg L⁻¹) after 3 weeks. Concentrations of chlorophyll <em>a</em>, chlorophyll <em>b</em> and <em>β</em>-carotene generally increased with exposure time for all treatments. Yet, no signs of recovery from exposure to high DFF concentrations were observed in the plants’ photosynthetic capacity after 2 weeks. These findings indicate that exposure to high concentrations of DFF reduces the photosynthetic performance and capacity of seagrass (<em>Z. marina</em> L.), which over time and combined with other environmental stressors may cause synergetic negative effects that are detrimental to seagrasses.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107342"},"PeriodicalIF":3.0,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144581044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Slow recovery in temperate mesophotic communities following disturbance: An example from Lough Hyne (Ireland)","authors":"Valerio Micaroni ,&nbsp;Rob McAllen ,&nbsp;Alberto Rovellini ,&nbsp;Francesca Strano ,&nbsp;Christine Morrow ,&nbsp;Bernard Picton ,&nbsp;John Turner ,&nbsp;Luke Harman ,&nbsp;James J. Bell","doi":"10.1016/j.marenvres.2025.107341","DOIUrl":"10.1016/j.marenvres.2025.107341","url":null,"abstract":"<div><div>Despite the ecological importance of temperate mesophotic ecosystems (TMEs), our understanding of the ecological processes within these systems and their potential to recover from disturbance remains limited. Here, we investigated the temporal dynamics of mesophotic sponge-dominated communities at Lough Hyne Marine Nature Reserve (Ireland) following a significant sponge mortality event in the early 2010s. Through the analysis of permanent quadrat data from 1994 to 1995 (pre-disturbance) and 2018–2021 (post-disturbance), we quantified the temporal variation in recovery rates of benthic communities and sponge populations across an environmental gradient. Although communities changed as a result of the disturbance, multivariate analyses did not detect any temporal changes in communities or sponge assemblages in the periods preceding or immediately after the disturbance. However, we did find a small increase in the abundance of some habitat-forming sponges and anemones at some sites, suggesting that a slow recovery may be underway. In contrast, other sites showed no signs of recovery. The heterogeneity of temporal dynamics and recovery trajectories among sites highlights the potential influence of environmental conditions on recovery. At current rates, some sponge populations may take decades to recover assuming there is no further disturbance. In general, we found that sponges and cnidarians showed very small temporal fluctuations both before and after the disturbance, suggesting high temporal constancy of these organisms in TMEs. These small temporal fluctuations likely derive from the slow growth, long lifespan, and low fecundity of many temperate mesophotic sponges and cnidarians. These results provide rare empirical evidence for long recovery times (several to many decades) of TME benthic communities following disturbance, as little recovery was observed at Lough Hyne after at least six years following the mortality events. As many TMEs worldwide remain largely unprotected, urgent global action is needed to conserve these ecosystems since any human impact may have long-lasting effects on TME biodiversity and ecosystem services.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107341"},"PeriodicalIF":3.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144550033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Evaluating the potential impacts of mesoscale eddies on the distribution and abundance of an environmentally sensitive squid species (Sthenoteuthis oualaniensis) in the Arabian Sea","authors":"Yingyue Fu ,&nbsp;Xiaoci Wu ,&nbsp;Pengchao Jin ,&nbsp;Xinjun Chen ,&nbsp;Qinwang Xing ,&nbsp;Fei Chai ,&nbsp;Jie Cao ,&nbsp;Wei Yu","doi":"10.1016/j.marenvres.2025.107337","DOIUrl":"10.1016/j.marenvres.2025.107337","url":null,"abstract":"<div><div>The purpleback flying squid (<em>Sthenoteuthis oualaniensis</em>) is widely distributed in the Arabian Sea and highly sensitive to environmental changes. Mesoscale eddies largely occur in the Arabian Sea, playing a significant role in regional biogeochemical processes. However, the impact of eddies on squid abundance is not well studied. Therefore, mesoscale eddies impacts on abundance and spatial distribution of <em>S</em>. <em>oualaniensis</em> were investigated in this study. The results indicated that the monthly catch-per-unit-effort (CPUE) of <em>S. oualaniensis</em> correlated with the variation in the number of eddies, and CPUE within cyclonic eddies (CE) was higher than that within anticyclonic eddies (AE). Sea surface temperature (SST), chlorophyll-<em>a</em> concentration (Chl-<em>a</em>), and dissolved oxygen at 150 m (DO150m) strongly affected the abundance of <em>S. oualaniensis</em>, showing distinct spatial distributions within CEs and AEs. These three key environmental factors were used to construct a habitat suitability index (HSI) model to evaluate the habitat distribution characteristics of <em>S. oualaniensis</em> within CEs and AEs, and results demonstrated CEs were more suitable. Within CEs, suitable SST and relatively lower DO150m aid in the growth and predator avoidance of <em>S. oualaniensis</em>. Overall, the eddies in the Arabian Sea regulate the abundance and distribution of <em>S. oualaniensis</em>, with CEs providing a more suitable habitat.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107337"},"PeriodicalIF":3.0,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144562909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Numerical study on long-term pollutant transport in northern part of Liaodong Bay","authors":"Xiaoyu Wang ,&nbsp;Jun Tang ,&nbsp;Yongming Shen","doi":"10.1016/j.marenvres.2025.107335","DOIUrl":"10.1016/j.marenvres.2025.107335","url":null,"abstract":"<div><div>This study employs the ECOMSED model to investigate the long-term pollutant transport mechanisms in the northern part of Liaodong Bay under the combined effects of wind, runoff and tides. Key findings reveal that runoff dominates initial transport near estuaries, while wind and the tidal reciprocation critically govern offshore diffusion pathways. Pollutants exhibit oscillatory dispersion patterns influenced by seasonal variations in runoff and wind, ultimately accumulating in the Liao River Estuary and the central-western bay. The Daliao River Estuary exhibits stronger self-purification capacity compare to the Liao River Estuary. The overall weaker environmental self-purification capacity in the northern part of Liaodong Bay hinders long-term pollutant export to the outer sea. These insights provide a scientific basis for managing land-based pollution in semi-enclosed coastal system.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107335"},"PeriodicalIF":3.0,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing the environmental health of urbanized mangroves on the Brazilian equatorial margin using widely consumed bioindicators (Ceará coast, Brazil)","authors":"Camila F. Alencar ,&nbsp;Antônia D.F. Lima ,&nbsp;Alessandra S.B. Moraes ,&nbsp;Ana B. Costa ,&nbsp;Rafael P. dos Santos ,&nbsp;Maria G.L. Coêlho ,&nbsp;Rodrigo Maggioni ,&nbsp;Rivelino M. Cavalcante","doi":"10.1016/j.marenvres.2025.107332","DOIUrl":"10.1016/j.marenvres.2025.107332","url":null,"abstract":"<div><div>Pollution is a major environmental pressure that degrades the quality of aquatic ecosystems, directly impacting the health of organisms. This study investigated the impact of chronic urban pollution in the Cocó River, Ceará, Brazil, by analyzing 59 pollutants originating from various anthropogenic activities, including polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs), polybrominated diphenyl ethers (PBDEs), pyrethroids (PPs), triazines (TPs) and organophosphates (OPPs), across environmental matrices: water, sediments, and biota (crustaceans: <em>Ucides cordatus</em>, fish: <em>Mugil curema, Eugerres brasilianus</em>, <em>Centropomus parallelus</em>, and <em>Oligoplites saurus</em>, and mollusks: <em>Phacoides pectinatus</em>, <em>Mytella charruana</em>, and <em>Crassostrea rhizophorae</em>). A total of 48 pollutant compounds were detected in fish, 33 in crustaceans, and 43 in mollusks. Among the contaminants detected, many originated from permitted pesticides, underscoring the limitations of current regulatory thresholds in safeguarding environmental and public health. Fish exhibited the highest concentrations, especially in the liver, a key organ for detoxification and storage of lipophilic compounds. With the most significant values in this organ, 6.12 ng/g for PCB180 in <em>M. curema</em> and 120 ng/g for propazine in <em>E. brasilianus.</em> More than 75 % of the fish species analyzed in this study exhibited moderate to severe anemia, with <em>E. brasilianus</em> presenting especially critical reductions in hematocrit and hemoglobin levels. Carcinogenic risks were consistently detected in fish, crustaceans, and mollusks, especially for compounds like aldrin and PCB180, raising concerns about long-term effects of chronic exposure. Although only some compounds are classified as carcinogenic, permitted pesticides have also been linked to neurotoxic and endocrine-disrupting effects, highlighting broader toxicological risks in these ecosystems.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107332"},"PeriodicalIF":3.0,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"No-take area status is not sufficient to protect the population of a reef-building coral in Barbados","authors":"Henri Vallès ,&nbsp;Irene Amaya Tovar ,&nbsp;Paule Mathieu ,&nbsp;Virginie Millien","doi":"10.1016/j.marenvres.2025.107336","DOIUrl":"10.1016/j.marenvres.2025.107336","url":null,"abstract":"<div><div>Coral reefs are undergoing rapid degradation due to global and local anthropogenic stressors. Mitigating local stressors through the establishment of no-take areas could help coral populations withstand global ones. Here, we first assess changes over a quarter century period (1997–2023) in coral colony size-structure, density, and distribution of an important Caribbean reef builder, the massive starlet coral <em>Siderastrea siderea</em>, inside the only no-take area of Barbados (West Indies). We then seek to establish a 2023 population baseline for this species to assess future change, including describing coral colony size-structure as well as spatial variation in key population attributes such as colony density, size, and partial mortality. During June–Aug 2023, we counted and measured <em>S. siderea</em> colonies on 49 100-m2 quadrats on a fringing reef inside the Barbados Marine Reserve (0.5–7 m deep). We compared these data with similarly collected data from 1997. The 2023 data revealed a population now virtually depleted of medium-to-large (diameter&gt;50 cm) colonies (5 % of the population) compared to 1997 (47 %). The population had also dropped in colony density by approximately 25 %. Colony size and density increased with depth, whereas colony partial mortality increased with colony size but was not related to depth. The dramatic colony size-structure shift and decrease in colony density of <em>S. siderea</em>, despite being in an effectively protected no-take area, raises concerns about the long-term persistence of this important coral species in Barbados.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107336"},"PeriodicalIF":3.0,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144534627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing ecological functions through polychaete traits in estuarine sediments","authors":"Amanda Martins,&nbsp;Francisco Barros,&nbsp;Marcos Krull","doi":"10.1016/j.marenvres.2025.107334","DOIUrl":"10.1016/j.marenvres.2025.107334","url":null,"abstract":"<div><div>Even though functional traits have been used to make inferences about ecosystem functioning, few studies have effectively measured the direct relationship between functional traits and functioning in marine environments. This study investigated and quantified how polychaete traits influence organic matter decomposition and bioturbation functions. Seven polychaete species were collected from the Jaguaripe estuary in Brazil, and two laboratory experiments were conducted to estimate the consumption rate, volume and depth of sediment bioturbated by different species. Computer tomography techniques were employed to measure bioturbated sediment volume and depth. Traits such as body weight, feeding mode, and movement type were analyzed to assess their relationship with organic matter decomposition and bioturbation. Results showed that body weight alone was the best predictor of organic matter consumption, with a positive relationship between weight and consumption. Furthermore, movement type was the main predictor of bioturbation. Burrowing polychaetes bioturbated an average sediment volume of 4.5 cm³ (2.15–9.61 cm³), which is five times greater than that of surface modifiers and three times greater than that of tubiculous polychaetes. Tubiculous species reached greater depths, constructing tubes up to 20 cm into the sediment. The study highlights the importance of species traits in predicting ecological functions, suggesting that a trait-based approach is effective when compared with traditional taxonomic classifications. These findings enhance our understanding of the functional roles of benthic macrofauna and underscore the need for experimental data on trait-based approaches.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107334"},"PeriodicalIF":3.0,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144534629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Comparative analysis of phytoplankton community structure and stability in the Arabian Sea and Bay of Bengal using eDNA metabarcoding","authors":"Changwen Li ,&nbsp;Ge Xiao ,&nbsp;Han Long ,&nbsp;Tongxi Ai ,&nbsp;Fenghua Tang ,&nbsp;Jianfeng Ju ,&nbsp;Shenglong Yang ,&nbsp;Yan Pi ,&nbsp;Lei Gao ,&nbsp;Lingbo Ma ,&nbsp;Wei Fan ,&nbsp;Ming Zhao ,&nbsp;Hanfeng Zheng ,&nbsp;Keji Jiang","doi":"10.1016/j.marenvres.2025.107333","DOIUrl":"10.1016/j.marenvres.2025.107333","url":null,"abstract":"<div><div>Environmental DNA (eDNA) metabarcoding, a non-invasive method for detecting aquatic organisms, has been widely used in phytoplankton diversity assessment. The Arabian Sea (AS) and the Bay of Bengal (BB), the two major ocean basins of the Northern Indian Ocean, exhibit differences in various aspects due to monsoonal influences. However, few eDNA studies have focused on the comparative research on phytoplankton communities in these two regions. To address this gap, in this study, a comparative analysis of phytoplankton community structure and stability was conducted in the AS and BB using eDNA metabarcoding. Clear differences in diversity and composition of phytoplankton communities between the two regions were observed. Higher richness and diversity were found in the BB than in the AS, and the differences in phytoplankton community structure were primarily driven by the nestedness process. Moreover, dinoflagellates were observed as the dominant taxa, and some dinoflagellate taxa showed significant differences between the two regions. Community assembly mechanism analysis revealed that the stochastic processes exhibited a weaker impact in the AS. Stability assessments, which combined co-occurrence network analysis and the metric of average variability degree, revealed higher community stability in the BB. These results not only confirmed the efficacy of eDNA metabarcoding in assessing phytoplankton diversity and stability, but also provided data support for the conservation of aquatic biodiversity and sustainable ecological management in the Northern Indian Ocean.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107333"},"PeriodicalIF":3.0,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144534630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Drivers of fish diversity and size spectra across lagoonal habitats of the Toliara reef system (SW Madagascar)","authors":"Henitsoa Jaonalison ,&nbsp;Marilaure Grégoire ,&nbsp;Jamal Mahafina ,&nbsp;James Mwaluma ,&nbsp;Helga Berjulie Ravelohasina ,&nbsp;Aina Le Don Nomenisoa ,&nbsp;Toky Justino Mory ,&nbsp;Lantoasinoro Ranivoarivelo ,&nbsp;Dominique Ponton ,&nbsp;Bruno Frédérich","doi":"10.1016/j.marenvres.2025.107330","DOIUrl":"10.1016/j.marenvres.2025.107330","url":null,"abstract":"<div><div>Size-spectra and taxonomic diversity are important indicators to study the dynamics of communities and to inform conservation in aquatic ecosystems. To date, few studies aimed at modelling the distribution of reef fish diversity at small spatial scales (∼10 km) have been done. Based on a one-year fish sampling using trawl nets, we described and modeled the distribution of fish diversity and their size spectra across various coastal habitats in the Toliara reef system (SW Madagascar). Our data revealed a significant spatial and seasonal change of taxonomic diversity. Beta-diversity was mainly driven by species turnover with up to 75 %, indicating the important conservation value of the sampled sites. Fish size spectra slope emphasized the high dominance of small-sized fish on the sites close to the shoreline indicating their potential nursery zones. By combining environmental and geographic data with the use of the machine learning algorithm Random Forest, we demonstrated the geographic position of sites and associated habitat features were the foremost drivers of alpha-diversity and size spectra patterns (50–64 % of variation). The use of Generalized Dissimilarity Models revealed sediment cover was the main predictor of species turnover patterns (62 % of explained variation), with a rapid increase of species replacement within the first 2 km from the coast. Beyond a confirmation of the role of habitat features on biodiversity, our study emphasized the importance of distance to the shoreline on the distribution of fish diversity across the lagoon. This unexpected driver is discussed in the light of various anthropogenic factors including fisheries and sedimentation.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107330"},"PeriodicalIF":3.0,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144501972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Community structure of marine megafauna inhabiting the Gulf of Arauco: The role of natural and anthropogenic factors in its spatial-temporal dynamics","authors":"Eduardo Hernández-Miranda ,&nbsp;Ninoska Figueroa ,&nbsp;Santiago Miranda ,&nbsp;Luís Montecinos ,&nbsp;M. Cristina Krautz ,&nbsp;Rodrigo Veas ,&nbsp;Renato A. Quiñones","doi":"10.1016/j.marenvres.2025.107329","DOIUrl":"10.1016/j.marenvres.2025.107329","url":null,"abstract":"<div><div>One of the challenges of ecology is to understand how natural and anthropogenic factors determine patterns of species distribution and abundance. The Gulf of Arauco, located in the central part of Chile, is a biologically highly productive area in the eastern South Pacific, with important human settlements and intensive coastal use. There is a submarine pipeline that carries effluent from wood pulp production to the coastal ocean. This study quantified the distribution and abundance of benthic megafauna in the Gulf of Arauco over a 3-year period, and evaluated the spatial dissimilarities from the submarine outfall through 13 seasonal surveys. The main results were as follows: (i) The megafauna in the Gulf of Arauco consisted of 92 <em>taxa</em>. The most abundant were Echinodermata: Ophiuroidea with <em>Ophiactis</em> sp. ; Mollusca-Gastropoda with <em>Nassarius dentifer</em>; and Cnidaria-Anthozoa with <em>Renilla</em> sp.; (ii) Species presence and abundance and community structure were highly heterogeneous at the spatial scale of the site and study Zones within the gulf; (iii) At the spatial scale of the gulf, and based on the gradient of the underwater pipeline, three significantly different areas were identified (Zones 1 and 3, close to the outfall with a signal of terrestrial organic matter, Zone 2 near to the coast, and Zones 4 and 5, far away from it), a pattern that was repeated across years, seasons of the year, and sampling periods; (iv) The areas closest to the submarine outfall were dominated by ophiuroids, probably associated with a greater load of organic matter from terrestrial plants in the sediments; (v) The areas closest to the pulp mill effluent are more influenced by the terrigenous and industrial inputs as indicated by the sediment lignin, tannin and AOXs contents; (vi) The zone closest to the submarine outfall had the highest average species richness, but beta multivariate diversity showed the opposite pattern, with the highest mean values in the zones farthest from the outfall.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"210 ","pages":"Article 107329"},"PeriodicalIF":3.0,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}