Marine environmental research最新文献

{"title":"Application of satellite and bio-argo float-based estimation of particulate organic carbon for ecosystem monitoring in the Arabian sea","authors":"S.R. Shahimol ,&nbsp;Rupam Kalita ,&nbsp;Aneesh Anandrao Lotliker","doi":"10.1016/j.marenvres.2025.107568","DOIUrl":"10.1016/j.marenvres.2025.107568","url":null,"abstract":"<div><div>Particulate organic carbon (POC) is an essential environmental parameter playing a crucial role in the biogeochemical carbon cycle. The present study estimates POC concentration, in the Arabian Sea, using satellite and bio-Argo float, providing time and three-dimensional space coverage. The satellite-derived POC concentration, using remote sensing reflectance, showed a good correlation (R² = 0.79) with the in-situ derived using backscattering coefficient, giving the confidence to combine these data for further analysis. Strong seasonality was observed in the surface and sub-surface distribution of POC concentration. During the southwest monsoon season, high POC concentration was observed along the coast primarily due to increased productivity by upwelling-induced nutrients. In contrast, during the northeast monsoon, higher POC concentration was observed in the northern Arabian Sea due to a boost in productivity due to nutrient influx through convective mixing. Although the POC concentration distribution was similar to chlorophyll-<em>a</em> (chl-<em>a</em>), their rate varied, as evident from the POC to chl-<em>a</em> ratio. The vertical distribution of POC concentration showed a remarkable Intermediate Nepheloid Layer (INL) between ∼200 and ∼400m, where suspended particle concentrations are higher than those in adjacent ocean layers. The INL was associated with high POC, low oxygen, and lower nitrate. The increase in subsurface POC may likely be due to the export flux and the associated low nitrate and high nitrite, below the thermocline and within the INL, under low oxygen, indicated the denitrification process. The significant findings from the study have enhanced the understanding of POC dynamics for effective monitoring of the ecosystem.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107568"},"PeriodicalIF":3.2,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155061","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":"How do polyethylene microplastics, ibuprofen, and sediment mud levels influence meiobenthic features and their interactions with CeO2-doped ZnO nanoparticles? Answers through nematode taxon/functional traits, allometry of Metoncholaimus pristiurus, and computational analyses","authors":"Mohamed Allouche ,&nbsp;Imen Bouzidi ,&nbsp;Amal Lassoued ,&nbsp;Badreddine Sellami ,&nbsp;Assia Derguini ,&nbsp;Takfarinas Idres ,&nbsp;Riadh Badraoui ,&nbsp;Naoufel Ben Hamadi ,&nbsp;Anis A. Chaudhary ,&nbsp;Hamdi Bendif ,&nbsp;Octavian Pacioglu ,&nbsp;Omar H. Abd-Elkader ,&nbsp;Fehmi Boufahja ,&nbsp;Gabriel Plavan","doi":"10.1016/j.marenvres.2025.107564","DOIUrl":"10.1016/j.marenvres.2025.107564","url":null,"abstract":"<div><div>Microplastic pollution and pharmaceutical contaminants represent growing environmental threats, particularly in aquatic ecosystems. This research examines the individual and combined effects of polyethylene microplastics, sediment particles, and ibuprofen on meiobenthic species, specifically free-living nematodes. Abundance changes, species diversity, and functional characteristics were monitored during a 30-day microcosm experiment. The binding affinities and molecular interactions of both contaminants with germ-line development protein 3 (GLD-3) and sex-determining protein (SDP) have been assessed using computational modeling assays. The results indicate that contamination significantly alters nematode communities, with pronounced declines in sensitive species such as <em>Dorylaimopsis timmi</em> and <em>Halalaimus longicaudatus</em>. At the same time, opportunistic taxa like <em>Paramonhystera pellucida</em> and <em>Parodontophora beviseta</em> exhibited increased abundance, resulting in a worldwide reduction of nematofauna (432 individuals in controls compared to 233–322 individuals in treated communities). The experimental results and computational assays supported each other. Furthermore, the strongest negative effects were observed in combined polyethylene-ibuprofen treatments, suggesting a synergistic interaction that enhances toxicity. Polyethylene microplastics appear to modulate the bioavailability and toxicity of ibuprofen, potentially exacerbating its impact on benthic communities. According to regressions linking body dimensions, the combination of polyethylene microplastics and ibuprofen with ZnO-CeO₂ (slopes: 0.53629 and 0.31718, respectively) nanoparticles enhanced the growth rate of the nematode <em>Metoncholaimus pristiurus</em>, compared to the control group (slopes: 0.05775).</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107564"},"PeriodicalIF":3.2,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105993","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":"Evidence for reducing fitness and competition of the native fish with invasive fish species in the south Caspian Sea","authors":"Shima Bakhshalizadeh ,&nbsp;Keivan Abbasi ,&nbsp;Adele Rostamzade Liafuie ,&nbsp;Francesco Tiralongo","doi":"10.1016/j.marenvres.2025.107566","DOIUrl":"10.1016/j.marenvres.2025.107566","url":null,"abstract":"<div><div>Invasive alien species are an increasing socioeconomic and ecological concern worldwide. Climate change may amplify the impact of non-native species, particularly in enclosed ecosystems such as the Caspian Sea. To assess the ecological impact of invasive alien species on native fish, the length-weight relationships and condition factor (CF) of 47 fish species were compared. The Scheirer-Ray-Hare test was used to examine CF differences between native and non-native species concerning their feeding ecology. Additionally, the Kruskal-Wallis test and Tukey's post hoc analysis were applied to identify significant differences among groups. The results indicate that CF was highest in carnivorous and non-native species, followed by groups with relatively high CF values, including native zooplanktivores, non-native benthivores, and native carnivores. Lower CF values were observed in omnivorous and native benthivores species, with the lowest CF recorded in non-native zooplanktivores. These findings suggest that CF can serve as a predictor of which introduced species may establish successfully. However, it remains unclear whether environmental changes driven by climate warming may enhance habitat suitability for invasive species in the southern Caspian Sea, promoting their further spread and invasiveness.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107566"},"PeriodicalIF":3.2,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105994","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":"Multi-media distribution, partitioning behavior, and environmental risk of per- and polyfluoroalkyl substances (PFASs) in the southern coastal zone of Shandong Peninsula, China","authors":"Hao Zang ,&nbsp;Yingming Feng ,&nbsp;Fan Yang ,&nbsp;Shengyuan Gao ,&nbsp;Mangmang Su ,&nbsp;Huijuan Li","doi":"10.1016/j.marenvres.2025.107562","DOIUrl":"10.1016/j.marenvres.2025.107562","url":null,"abstract":"<div><div>Per- and polyfluoroalkyl substances (PFASs) pose significant ecological threats due to their persistence and toxicity. This study investigates the occurrence, partitioning behavior, and environmental risks of 33 legacy and emerging PFASs in the southern coastal zone of Shandong Peninsula, China. Paired water and sediment samples were collected from 55 sites across groundwater, river, estuarine, tourist beaches and marine ranches. PFASs were ubiquitously detected, with total concentrations (∑PFASs) ranging from 23.41 to 80.62 ng/L in water and 0.38–6.49 ng/g dry weight (dw) in sediment. Except perfluorooctanoic acid (PFOA), perfluorobutanoic acid (PFBA) (6.42 ± 2.26 ng/L) and perfluorobutanesulfonic acid (PFBS) (3.03 ± 1.44 ng/L) dominated aqueous phases, reflecting phased-out replacements of long-chain homologs. Sediments accumulated long-chain compounds (e.g., Perfluorohexanoic acid (PFHxA): 0.92 ± 1.08 ng/g dw; perfluorooctane sulfonic acid (PFOS): 0.45 ± 0.28 ng/g dw), driven by hydrophobic partitioning. Strong positive correlations among long-chain PFASs (e.g., Perfluorododecanoic acid (PFDoDA)- perfluorotetradecanoic acid (PFTeDA), <em>r</em> = 0.882) indicated co-accumulation in organic-rich sediments. Spatial analysis revealed land-to-sea concentration gradients, with maxima in estuaries (52.72 ng/L) and industrial-adjacent sediments (6.48 ng/g dw). Groundwater infiltration (up to 51.53 ng/L) highlighted subsurface transport risks. Sediment-water partition coefficients (log K_<em>d</em>) increased with carbon chain length and salinity, consistent with salting-out effects and reduced electrostatic repulsion. Organic carbon-normalized log K_<em>oc</em> values (K_<em>ow</em> method) aligned with model predictions for most PFASs. Risk assessment identified high ecological risk for sediment-bound PFOS (RQ &gt; 1) near river discharges, while PFOA posed greater aqueous-phase risks. Emerging PFASs (e.g., 6:2 chlorinated polyfluoroalkyl ether sulfonic acid (6:2 Cl-PFESA)) showed negligible risks. Coastal sediments act as significant PFASs reservoirs, with resuspension potential enabling secondary pollution.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107562"},"PeriodicalIF":3.2,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118642","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":"Seasonal dynamics at low trophic level and ecological interactions of microbial and plankton communities during harmful algal blooms","authors":"Yunjung Park ,&nbsp;Joonyeop Lee ,&nbsp;Soonmo An ,&nbsp;Jaeho Cha","doi":"10.1016/j.marenvres.2025.107553","DOIUrl":"10.1016/j.marenvres.2025.107553","url":null,"abstract":"<div><div>This study investigates the seasonal dynamics of microbial and plankton communities in Tongyeong (TY) and the Bodol Sea near Yeosu (YS), South Korea, focusing on the interactions during algal blooms and their ecological implications. In May at TY, moderate chlorophyll a (Chl-a) and high copepod abundance suggest top-down control by zooplankton grazing, rather than nutrient limitation, regulates phytoplankton biomass. Microbial communities resembled those during August YS blooms, likely due to enhanced organic matter from grazing. By late summer, reduced nutrients favored <em>Dinoflagellata</em> and <em>Ochrophyta</em> indicating weakened grazing pressure and greater microbial diversity.</div><div>In August at YS, a harmful <em>Cochlodinium</em> bloom dominated offshore waters, while diatoms prevailed nearshore. Elevated Chl-a, oversaturated oxygen, and low copepod abundance indicated disrupted trophic balance during the blooming. <em>Cochlodinium</em> correlated strongly with bacteria such as <em>Pseudoaltermonas</em> and <em>Vibrio</em>, reflecting responses to high productivity. After the bloom decline in September, <em>Syndiniales</em> (parasitic dinoflagellates) increased, suggesting predator-prey regulation of algal populations. Bacterial remineralization supported nutrient cycling, maintaining ecosystem balance.</div><div>Contrasting responses to high productivity were observed: TY exhibited strong top-down control without biomass accumulation, whereas YS experienced significant biomass buildup during the bloom. Despite these differences, the microbial communities in both systems were similar and reflected the degree of productivity more accurately than the primary producers themselves. Overall, these results highlight the complex interactions among primary producers, grazers, and microbes, emphasizing the critical role of trophic dynamics in shaping coastal bloom events.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107553"},"PeriodicalIF":3.2,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118724","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":"Trait-based modelling approach to disentangle the intricate dynamics of environmental factors in shaping mesozooplankton community from river Thakuran, Sundarbans estuarine system","authors":"Ahmed Shahir,&nbsp;Snigdha Bhaumik,&nbsp;Bhaskar Karmakar,&nbsp;Sumit Mandal","doi":"10.1016/j.marenvres.2025.107567","DOIUrl":"10.1016/j.marenvres.2025.107567","url":null,"abstract":"<div><div>Mesozooplankton are pivotal components of estuarine food webs, regulating ecosystem functioning, nutrient cycling, and energy flow. This study examines spatio-temporal variations in mesozooplankton communities in response to environmental changes along the Thakuran River within the Sundarbans estuarine system (SES). Over four years, samples were collected from eight stations spanning a salinity gradient during pre-monsoon (PreM), monsoon (Mon), and post-monsoon (PostM) periods to assess community structure, functional diversity, and species–environment relationships. Environmental parameters differed significantly among seasons (<em>p</em> &lt; 0.0001). We documented 63 mesozooplankton taxa, with mean abundances ranging from 1193 ± 150 ind. m⁻³ (Mon) to 776 ± 113 ind. m⁻³ (PostM). A Double Principal Coordinates Analysis (DPCoA) permutation test revealed mild dependency of species distribution on functional traits (<em>p</em> &lt; 0.001). Copepods dominated the community, represented by six functional groups. Omnivore–herbivorous copepods, notably <em>Acartia spinicauda</em> and <em>Paracalanus parvus</em>, peaked during Mon, whereas carnivorous copepods (<em>Labidocera minuta</em>, <em>Corycaeus siusculus</em>) and chaetognaths increased in abundance during PostM. Functional diversity indices were highest in PreM and declined during Mon. Hierarchical modelling of species communities (HMSC) identified silicate, phosphate, salinity, and suspended particulate matter as primary drivers of mesozooplankton abundance. Additionally, salinity, nitrite, phosphate, chlorophyll <em>a</em>, and secchi depth were significantly correlated with most species, while water temperature, salinity, and dissolved oxygen correlated strongly with body size and habitat preference. These findings underscore the value of trait-based ecological modelling in elucidating seasonal dynamics of estuarine mesozooplankton communities.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107567"},"PeriodicalIF":3.2,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105992","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":"Quantitative organic carbon source in suspended particulates from the Dagu River-estuary-Jiaozhou Bay system (North China)","authors":"Jiang Yi-ao Zhang ,&nbsp;Yixuan Liu ,&nbsp;Xiaotong Xiao ,&nbsp;Tiehan Huang ,&nbsp;Meng Yu ,&nbsp;Ke Liu ,&nbsp;Yang Ding ,&nbsp;Meixun Zhao","doi":"10.1016/j.marenvres.2025.107565","DOIUrl":"10.1016/j.marenvres.2025.107565","url":null,"abstract":"<div><div>The small and medium-sized rivers play an important role in the transport and burial of organic carbon (OC) in coastal zones. However, the small- and medium-sized rivers discharging into the marine environment have received less attention regarding their OC source. Understanding sources of OC in coastal zones is important to better evaluate the processes controlling the carbon cycle. In this study, the Dagu River-Estuary-Jiaozhou Bay system, an important carbon sink and a small bay heavily affected by human activities, was selected as the study area. We conducted comprehensive analyses of bulk parameters and biomarkers in the suspended particulate matter (SPM) of the Dagu River and Jiaozhou Bay. The Spearman correlation coefficients between bulk parameters, stable isotopes, biomarkers and environmental parameters in the SPM verified that the Dagu River represents the primary fluvial input to this marine system, delivering enhanced terrestrial organic matters and nutrients. The particulate organic carbon (POC), particulate nitrogen (PN), stable isotopes (δ¹³C) and biomarkers (C₂₆+C₂₈+C₃₀ <em>n</em>-alkanols and the ΣPB (sum of phytoplankton biomarkers)) were used in this study to elucidate the sources of POC, respectively. The three endmember mixing model (based on δ¹³C and C/N) was applied to quantify OC into river, wetland and phytoplankton OC fractions. The results revealed distinct spatial partitioning: river OC dominated riverine SPM (58 %), while wetland OC prevailed in the inner bay (55 %), and phytoplankton OC prevailed in the estuarine SPM (58 %). Biomarkers (<em>n</em>-alkanes and coprostanol) were used to further assess the impact of the anthropogenic activities such as petroleum contamination and the sewage discharge. The results indicated that the SPM in the Jiaozhou Bay has been widely affected by human activities. This study employs an integrated three-method approach to comprehensively characterize the sources and composition of OC across the river-estuary-bay system.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107565"},"PeriodicalIF":3.2,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105996","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":"Combined atmospheric and marine heatwaves exacerbate the impacts of a non-indigenous species, the Asian date mussel Arcuatula senhousia, on benthic ecosystem functioning","authors":"Marie P.A. Fouet ,&nbsp;Cécile Massé ,&nbsp;Léna Bonnissant ,&nbsp;Hugues Blanchet ,&nbsp;Olivier Maire ,&nbsp;Guillaume Bernard","doi":"10.1016/j.marenvres.2025.107560","DOIUrl":"10.1016/j.marenvres.2025.107560","url":null,"abstract":"<div><div>Climate change is predicted to increase the frequency, severity, and duration of extreme climatic events such as heatwaves. Benthic organisms inhabiting intertidal flats are subjected to both marine and atmospheric heatwaves and can experience extreme temperature variations over relatively short periods of time. Non-indigenous species are generally capable to cope with extreme events more efficiently that native species. The Arcachon bay, a lagoon located along the French Atlantic coast is currently colonised by the invasive mussel, <em>Arcuatula senhousia</em>. In this study, we investigated how these two stressors (non-indigenous species colonisation and heatwaves) affect soft-bottom ecosystem functioning. We conducted two seasonal laboratory experiments to investigate the effects of combined marine and atmospheric heatwaves on the biogeochemical dynamics of sediments colonised by <em>A. senhousia</em> at different densities<em>.</em> More precisely, we assessed the community scale responses by measuring nutrients (NO_x, NH₄⁺, PO₄³⁻) and oxygen fluxes across the sediment-water interface. The results highlight that (1) heatwaves affect oxygen and nutrient exchanges across the sediment-water interface, with an increase of oxygen consumption and NH₄⁺, PO₄³⁻ fluxes, (2) the magnitude of these effects can be strongly enhanced by increasing densities of <em>A. senhousia,</em> and (3) a marked seasonal-dependence, with more effects during the spring experiment. These results emphasise that the interaction between the seasonality of heatwave occurrence, its intensity and the level of colonisation by non-indigenous ecosystem engineers likely shape their consequences for ecosystem functioning in tidal flats. Our results thus reinforce previous findings suggesting that climate change may profoundly exacerbate the effects of biological invasions.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107560"},"PeriodicalIF":3.2,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145227138","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":"Environmental factors affecting the presence of coliform bacteria in water and oysters (Crassostrea cucullata Born, 1778) in Negombo lagoon, Sri Lanka","authors":"Samuel Ayitey ,&nbsp;Thanne Walawwe Gedera Fathima Mafaziya Nijamdeen ,&nbsp;Harshini Peiris ,&nbsp;Sunanda Kodikara Arachchilage ,&nbsp;Isabelle F. George ,&nbsp;Farid Dahdouh-Guebas ,&nbsp;K.H.M. Ashoka Deepananda","doi":"10.1016/j.marenvres.2025.107561","DOIUrl":"10.1016/j.marenvres.2025.107561","url":null,"abstract":"<div><div>The recent increase in sewage pollution in the Negombo Lagoon, Sri Lanka, has led to a growing interest in understanding its impact on the local aquatic ecosystem. Physicochemical and general microbiological parameters of the lagoon water (n = 84) were measured at seven sites with contrasted levels of fecal and organic pollution, and their correlation with the presence of total coliform bacteria (TC) was examined. A linear mixed-effect model revealed that heterotrophic bacterial concentrations and electrical conductivity significantly correlated with TC concentrations. Additionally, six individuals of <em>Crassostrea cucullata</em> oysters were sampled from five sites (n = 30) to assess their TC levels and compare their variation across sites. Significant differences in TC levels in oysters were observed across the study sites, with oysters from site S7 located in the Northern part of the lagoon being the most contaminated ones. Fecal indicator bacteria, <em>Escherichia coli</em>, were found to be present across all the studied sites except S5. Additionally, oysters from five sites tested positive for <em>E. coli</em> contamination. The smallest oysters were found at the site most contaminated by microbial load (S2), which may suggest that oysters had decreased filtering activity at the site in response to pollution. Overall, this is the first comprehensive study to provide comparative quantitative data on fecal contamination of oysters in the Negombo Lagoon and its surrounding water.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107561"},"PeriodicalIF":3.2,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105982","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":"Understanding and managing species range shifts: first observed mixed-species outbreak and coral predation by crown-of-thorns starfish (Acanthaster brevispinus and A. cf. solaris) on subtropical reefs","authors":"Brigitte Sommer ,&nbsp;Hamish A. Malcolm ,&nbsp;Christopher Cooney ,&nbsp;Steven J. Dalton ,&nbsp;Shawna A. Foo ,&nbsp;Nicola Fraser ,&nbsp;Tsai-Hsuan Tony Hsu ,&nbsp;David Maguire ,&nbsp;Matt J. Nimbs ,&nbsp;Nicole Strehling ,&nbsp;Monique Webb ,&nbsp;Maria Byrne","doi":"10.1016/j.marenvres.2025.107556","DOIUrl":"10.1016/j.marenvres.2025.107556","url":null,"abstract":"<div><div>Climate change is forcing scientists and natural resource managers to contend with species range shifts and altered species interactions. These range shifts are difficult to detect and can have unexpected consequences, especially when range expanding predators feed on resident species. On tropical western Pacific coral reefs, outbreaks of the coral-eating crown-of-thorns starfish, <em>Acanthaster</em> cf. <em>s</em><em>olaris</em>, cause widespread coral loss. Here we document the poleward range expansion of its close relative <em>Acanthaster brevispinus</em>, often a non-coral-eating species, to the subtropics of eastern Australia (30°S). In this region, corals grow directly on rocky substrate and persist in marginal conditions at their poleward range limits. We recorded the first mixed species outbreak of <em>A. brevispinus</em> and <em>A.</em> cf. <em>s</em><em>olaris</em> (91 and 39 starfish, respectively) where both species preyed on a broad diet of primarily endemic and high-latitude corals. The unusually broad diet of the two predator species compounded the detrimental effects on vulnerable high-latitude coral asemblages, which host many long-lived and slow-growing coral species that will be slow to recover (e.g., <em>Paragoniastrea australensis, Acanthastrea echinata, Micromussa lordhowensis, Astrea curta</em>). Both crown-of-thorns species also preyed on other cnidarian species including zoanthids and corallimorpharians. We show that collaborative efforts across marine resource managers, researchers, dive operators, and citizen scientists facilitated adaptive management that led to the swift control of the outbreak to protect vulnerable high-latitude coral assemblages. This highlights the success of cross-jurisdictional, cooperative management in adapting to the challenge of species redistribution under climate change.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107556"},"PeriodicalIF":3.2,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145102715","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}