Marine environmental research最新文献

{"title":"Iron bioaccumulation in coral reef organisms and biodilution in the reef food web: A mesocosm approach","authors":"Adalto Bianchini ,&nbsp;Letícia May Fukushima ,&nbsp;Ana Carolina Grillo ,&nbsp;Kelly Yumi Inagaki ,&nbsp;Juliana Andrade ,&nbsp;Ligia Salgado Bechara ,&nbsp;Giovanna Destri ,&nbsp;Vitor André Passos Picolloto ,&nbsp;Thales Jean Vidal ,&nbsp;Alessandra Lopes de Araújo ,&nbsp;Juliana da Silva Fonseca ,&nbsp;Emiliano Nicolas Calderon ,&nbsp;Kely Paula Salvi ,&nbsp;Carlos Henrique Figueiredo Lacerda ,&nbsp;Patrícia Gomes Costa ,&nbsp;Miguel Mies","doi":"10.1016/j.marenvres.2025.107586","DOIUrl":"10.1016/j.marenvres.2025.107586","url":null,"abstract":"<div><div>Iron (Fe) is an essential metal for marine organisms, but at excessive environmental concentrations, it can cause ecophysiological adverse effects. In the present study, Fe bioaccumulation was investigated in several groups of reef organisms: turf algae, rhodoliths, fleshy macroalgae (<em>Sargassum</em> sp. and <em>Lobophora variegata</em>), corals (<em>Millepora alcicornis</em>, <em>Mussismilia harttii</em> and <em>Siderastrea</em> sp.), fish (<em>Stegastes fuscus</em>), and brittle star (<em>Ophioderma appressum</em>). Organisms were kept in seawater without Fe addition (control condition) or in incrementing concentrations of dissolved Fe (100, 300, and 900 μg L⁻¹) for 28 days, using a marine mesocosm system. In seawater without Fe addition, coral skeletons and brittle star arms showed the lowest Fe concentration (1.91–4.61 μg g⁻¹ dry weight) while macroalgae and fish liver exhibited the highest Fe concentration (184–210 μg g⁻¹ dry weight). After exposure (14 or 28 days) to the incrementing concentrations of Fe in seawater, turf algae, corals (skeleton and tissue), fish (muscle, gill, and liver) and brittle star (arm and disc) did not accumulate Fe. On the other hand, Fe bioaccumulation was observed in rhodoliths (4.35-fold) and macroalgae (<em>Sargassum</em> sp.: 5.81-fold; <em>L. variegata</em>: 4.51-fold). Bioconcentration factor values were markedly higher in macroalgae (646‒1319) than in the other biological matrices evaluated (8.14–229). This finding evidences Fe bioaccumulation in key primary producers and highlights the potential risk of Fe impacts in coral reefs because of excessive dissolved concentrations of this metal. Food web magnification factors (FWMF) in the control condition and after Fe exposure (900 μg L⁻¹) for 28 days corresponded to 0.481 and 0.404, respectively. Across all tested dissolved Fe concentrations and exposure times, a general biodilution of Fe (FWMF &lt;1.00) was observed throughout the analyzed reef food web.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107586"},"PeriodicalIF":3.2,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220593","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 non-stationary impacts of climate and environmental conditions on Argentine shortfin squid (Illex argentinus) in the southwest Atlantic Ocean","authors":"Lizi Zhang ,&nbsp;Zhiping Feng ,&nbsp;Pengchao Jin ,&nbsp;Wei Yu","doi":"10.1016/j.marenvres.2025.107585","DOIUrl":"10.1016/j.marenvres.2025.107585","url":null,"abstract":"<div><div>Growing evidence highlights non-stationarity in climate-ecosystem relationships, suggesting that traditional analyses assuming stationarity may inadequately capture the dynamic responses of marine species to climate change. The Argentine shortfin squid (<em>Illex argentinus</em>), a key economic species in the southwest Atlantic Ocean (SWAO), is highly sensitive to environmental variability. This study investigated the changes in <em>I. argentinus</em> catch in the Patagonian Shelf region of the SWAO in response to climate variability and characterized its non-stationary features. We used a Threshold Generalized Additive Model (TGAM) and key environmental and climate variables to identify threshold years in the climate-catch relationship for <em>I</em>. <em>argentinus</em>. Results revealed significant non-stationarity with two critical thresholds: 1990/1991 and 2015/2016. In the late 1980s, the climate-regulated Weddell Sea Ice Extent (WSIE) underwent a regime shift, concurrently with long-term average states of its associated Southern Ocean environmental variables—sea surface height (SSH) and water temperatures at 50m and 100m depths. This coincided with an abrupt increase in <em>I</em>. <em>argentinus</em> catch, marking the onset of the first threshold year. In the second threshold year, WSIE and Sea Surface Temperature (SST) simultaneously transitioned to new states, accompanied by anomalous fluctuations in the critical influencing variable SSH. These changes adversely affected <em>I</em>. <em>argentinus</em>, leading to a sustained decline in catch. Research indicates that, even when excluding fishing efforts, climate-driven environmental non-stationarity is a crucial factor influencing the fluctuations in <em>I. argentinus</em> catch. Understanding these non-stationary dynamics is essential for robust sustainable fisheries management under persistent fishing pressure and climate change.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107585"},"PeriodicalIF":3.2,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145213072","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 toxicity of produced water from carbonate reservoirs in the North sea using oyster Embryo development tests","authors":"Neri Bonciani ,&nbsp;Steven Brooks ,&nbsp;Karen L. Feilberg","doi":"10.1016/j.marenvres.2025.107582","DOIUrl":"10.1016/j.marenvres.2025.107582","url":null,"abstract":"<div><div>Produced water (PW) is the largest waste stream from offshore oil and gas production and a major contributor to marine pollution. In the North East Atlantic, approximately 287 million m³ of PW—containing hydrocarbons, suspended particulate matter (SPM), metals, and production chemicals—is discharged annually, including ∼18 million m³ from Danish operations. While current OSPAR regulations and risk-based approaches (RBA) rely on oil-in-water limits and acute tests PNECs, they often overlook chronic and sublethal effects, particularly from unregulated naturally occurring compounds. Early life stages of marine invertebrates, such as the Pacific oyster <em>Magallana gigas</em>, are highly sensitive to such contaminants and serve as effective bioindicators. This study applies the <em>M. gigas</em> embryo bioassay to PW samples from multiple Danish North Sea fields, using manipulations that remove SPM and purge volatile compounds to help identify toxicity drivers. The results showed that most of PW samples inhibited larval development, with significant differences among fields and sampling times, even in identically treated samples. PW from two out of four fields exhibited notably higher toxicity, potentially linked to elevated SPM content, metals, and production practices such as waterflooding. Evidence suggests that SPM may act as a carrier for pollutants, slightly increasing toxicity. Temporal variation in PW toxicity further indicates that more frequent monitoring is needed to capture fluctuations in discharge composition and associated risks. Given that carbonate reservoirs dominate global oil and gas production and <em>M. gigas</em> is established in the North Sea, these findings have both regional and global relevance. They underscore the importance of integrating compositional data with field-specific toxicity responses to guide targeted management strategies and support the industry's goal of “zero harmful discharge” by 2050.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107582"},"PeriodicalIF":3.2,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145206731","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":"Kuroshio extension-driven variability in spring zooplankton community structure and function","authors":"Ruping Ge ,&nbsp;Jinao Xuan ,&nbsp;Xinxin Wang ,&nbsp;Honghai Zhang ,&nbsp;Hongju Chen ,&nbsp;Yunyun Zhuang ,&nbsp;Guangxing Liu","doi":"10.1016/j.marenvres.2025.107584","DOIUrl":"10.1016/j.marenvres.2025.107584","url":null,"abstract":"<div><div>The Kuroshio Extension (KE) and its adjacent waters are among the regions with the most drastic hydrological changes in global ocean. However, research on the structure and function of zooplankton communities in this region remains limited. This study focused on the impact of the KE on the structure and function of zooplankton communities in the open waters off eastern Japan. The results showed that the presence of the KE strongly hindered water exchange between its northern and southern sides, leading to significant differences in zooplankton community structure. Zooplankton in the Oyashio regions exhibited high abundance (3791.9 ind.·m⁻³) and low species richness (118 taxa), while the North Pacific Subtropical Gyre (NPSG) regions had higher species richness (207 taxa) but lower abundance (134.5 ± 112.0 ind.·m⁻³) compared to the Oyashio regions. The maximum species number of zooplankton occurred in the Kuroshio-Oyashio mixing water (KOMW) regions (327 taxa). Regarding zooplankton functional groups, small-bodied ambush–feeding, omnivore–herbivores and medium-bodied current–feeding, omnivore–herbivores, broadcast spawners were dominant in the Oyashio regions and the KOMW regions, whereas cruise–feeding, omnivore–herbivores, sac spawners prevailed in the oligotrophic NPSG regions. Additionally, the advection of the KE transported coastal species such as <em>Noctiluca scintillans</em> and <em>Penilia avirostris</em> to the open waters off eastern Japan, significantly altering the local zooplankton community structure and function. <em>P. avirostris</em> became the dominant species in the local zooplankton community of the KE and KOMW regions, and functional group primarily consisting of <em>P</em>. <em>avirostris</em> showed high relative abundance in the local zooplankton community. This study enhanced our understanding of the impact of the KE on zooplankton in the open waters off eastern Japan and provided a scientific basis for in-depth comprehension of marine food web dynamics and biogeochemical cycling processes in the KE and its adjacent waters.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107584"},"PeriodicalIF":3.2,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145199921","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":"Aqueous film-forming foams used in Brazil are toxic to neotropical invertebrates","authors":"Maysa Ueda de Carvalho ,&nbsp;Lucas Buruaem Moreira ,&nbsp;Luciane Alves Maranho ,&nbsp;Denis Moledo de Souza Abessa","doi":"10.1016/j.marenvres.2025.107581","DOIUrl":"10.1016/j.marenvres.2025.107581","url":null,"abstract":"<div><div>Aqueous film-forming foams (AFFFs) are an efficient firefighting strategy worldwide, and many of these products consist of complex mixtures containing per- and poly-fluoroalkyl substances (PFAS). The use of PFAS-based AFFFs is concerning because some of their constituents are classified as Persistent Organic Pollutants, thus their utilization during firefighting in industrial and harbor areas may increase the environmental impacts. In this study, the AFFFs toxicity to marine invertebrates was assessed using waterborne exposure. Seven PFAS-based commercial AFFFs (AFFF-1 to AFFF-7) employed to combat a major fire in the Port of Santos (Brazil) were obtained tested for acute toxicity to the brine shrimp <em>Artemia salina</em> and chronic toxicity to embryos of the brown mussel <em>Perna perna</em>, the sand dollar <em>Mellita quinquiesperforata</em>, and the sea urchins <em>Lytechinus variegatus</em> and <em>Echinometra lucunter</em>. Chronic toxicity tests on the reproduction of the copepod <em>Nitokra</em> sp. were conducted for two of the samples. All AFFFs were toxic to the marine species tested. Toxic dilutions were reported from 0.0001 % to 0.001 %, equivalent to concentrations between 1 and 10 thousand times lower than the application rates recommended by the manufacturers. AFFF-1, AFFF-5, and AFFF-7 were classified as moderately toxic, whereas AFFF-3, AFFF-4, and AFFF-5 were highly toxic, and AFFF-2 was very highly toxic. The hazard quotient values were elevated, ranging from 100 to 1000 times above the established thresholds. Our findings provide critical insights into the environmental hazards of AFFF use, particularly in Latin America and Caribbean coastal ecosystems, where regulatory frameworks are still being developed.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107581"},"PeriodicalIF":3.2,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145213133","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":"Histopathological and physiological response to zinc exposure in Orchestia species from a Tunisian lagoon","authors":"Mehdia Fraj ,&nbsp;Hajer Khemaissia ,&nbsp;Karima Nasri-Ammar ,&nbsp;Chedliya Ghemari ,&nbsp;Catherine Souty-Grosset ,&nbsp;Maryline Raimond ,&nbsp;Raja Jelassi","doi":"10.1016/j.marenvres.2025.107583","DOIUrl":"10.1016/j.marenvres.2025.107583","url":null,"abstract":"<div><div>The Bizerte lagoon is a highly productive coastal ecosystem, yet it faces constant pressure from human activities and exposure to Zinc. This study compared Zn bioaccumulation in three <em>Orchestia</em> species (<em>Orchestia gammarellus</em>, <em>Orchestia montagui</em>, and <em>Orchestia mediterranea</em>) collected from the lagoon's banks. Individuals were exposed to contaminated soil with three different zinc concentrations, and their biological and physiological responses were assessed. Body zinc concentrations were measured using flame atomic emission spectrometry. Results showed a significant increase in mortality by the second week of exposure, alongside notable differences in body mass variations between species. <em>O. mediterranea</em> exhibited greater resilience to zinc exposure. Zinc accumulation in the <em>Orchestia</em> species was considerably higher than in the surrounding sediment, classifying all three species as macroconcentrators of zinc. Additionally, zinc-contaminated substrates induced structural changes in the amphipods' hepatopancreas, considered as the efficient storage organ, with the most pronounced alterations occurring at the highest zinc concentrations. In <em>O. gammarellus</em>, ultrastructural changes included lipid granules of varying shapes and sizes, while <em>O. montagui</em> and <em>O. mediterranea</em> displayed disrupted cell borders and swollen mitochondria.</div><div>This study highlights the sensitivity of <em>Orchestia</em> species to zinc contamination, confirming their potential as bioindicators of metal pollution in coastal environments.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107583"},"PeriodicalIF":3.2,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145213129","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":"Dynamics of phytoplankton functional groups and carbon concentrations in an estuary on the Brazilian equatorial margin","authors":"Danielle Stephane Campos Souza ,&nbsp;Andrea Christina Gomes de Azevedo-Cutrim ,&nbsp;Ana Karoline Duarte dos Santos Sá ,&nbsp;Marco Valério Jansen Cutrim ,&nbsp;Ana Virgínia Gomes de Oliveira ,&nbsp;Quedyane Silva da Cruz ,&nbsp;Rayane Serra Rosas ,&nbsp;Christyélen Campos Souza","doi":"10.1016/j.marenvres.2025.107559","DOIUrl":"10.1016/j.marenvres.2025.107559","url":null,"abstract":"<div><div>The study of phytoplankton functional groups is essential for understanding the ecological dynamics of hypertrophic environments. The Anil River Estuary (ARE) is located on the Brazilian equatorial margin on the northern coast of Brazil and is influenced by semidiurnal macrotides from the South Atlantic and the river waters of the Anil River, which are highly urbanized and have many anthropic pressures. Between 2022 and 2023, six sampling campaigns were conducted at eight points across two sectors (SI - eutrophic; SII - hypertrophic) during the dry and rainy seasons. The functional diversity (FD) of the community was assessed using indices FEve, FDiv, and FDis, based on a matrix of functional traits and species density. The ARE phytoplankton community comprised 234taxa in six taxonomic groups, with diatoms being the most abundant (57.69 %), followed by Cyanobacteria (14 %) and Myozoa (8.5 %). Twenty-five Reynolds functional groups (FGs) were identified, significantly influenced by salinity and pH, with groups M and X1 being the most representative. The FGs varied between sectors and seasons, with SII recording 85 % of the species within 25 groups during the rainy season, while SI showed 76 % in 23 groups. Functional traits allowed the formation of three major groups: (I) species from hypertrophic environments (&lt;20 μm), dominated by cyanobacteria and charophytes; (II) marine diatoms from eutrophic environments (&gt;20 μm); and (III) species from estuarine waters, including euglenophytes and chlorophytes (&gt;20 μm). The study highlights the relationship between the functional composition of phytoplankton and environmental conditions in an estuary impacted by urbanization and eutrophication.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107559"},"PeriodicalIF":3.2,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155059","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":"Corrigendum to \"Long-term variability analysis of the habitat suitability index for Todarodes pacificus (Japanese common squid) using MODIS-Aqua dataset in the East/Japan Sea, South Korea\" [Mar. Environ. Res. (2025) 107537].","authors":"Dabin Lee, Jin-Yong Choi, Huitae Joo, Hyo Keun Jang, Sungjun Kim, Myung Joon Kim, Yoon Ji Lee, Sang Heon Lee","doi":"10.1016/j.marenvres.2025.107579","DOIUrl":"https://doi.org/10.1016/j.marenvres.2025.107579","url":null,"abstract":"","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":" ","pages":"107579"},"PeriodicalIF":3.2,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145149757","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":"Elevated pCO2 and temperature levels modulate the ratios of the photosynthetic methane production to CO2 fixation in the coccolithophorid Emiliania huxleyi","authors":"Yuming Rao ,&nbsp;Kunshan Gao","doi":"10.1016/j.marenvres.2025.107580","DOIUrl":"10.1016/j.marenvres.2025.107580","url":null,"abstract":"<div><div>Most phytoplankton species have been shown to release methane (CH₄) during photosynthesis; however, little has been documented on how changed levels of CO₂ at different temperatures affect their CH₄ production along with photosynthetic C fixation. Here, we examined CH₄ production and photosynthetic performance in the most cosmopolitan coccolithophorid, <em>Emiliania huxleyi</em>, grown under high (1000 μatm, HC) and ambient (415 μatm, LC) <em>p</em>CO₂ levels at five temperatures (16, 20, 22, 24 and 27 °C). The HC treatment slightly lowered the optimal temperature for growth and CH₄ production, and temperature changes significantly affected both carbon fixation and CH₄ production. Under suboptimal temperatures, increasing temperature from 16 to 20 °C led to about 96 % increase in CH₄ production per POC and HC treatment further enhanced this increase by an additional 9 %. In contrast, under super-optimal temperatures, a temperature rise by 4 °C reduced the microalgal CH₄ production per POC under HC treatment by about 24 % compared to the control. The calculated CH₄ production quotient (MPQ, CH₄ released vs. CO₂ fixed) ranged between 2 × 10⁻⁵−6 × 10⁻⁵, and showed a decreasing trend with increasing temperature under both <em>p</em>CO₂ levels, implying that the CH₄ production by this microalga is being affected by global ocean changes, and the CH₄ produced by phytoplankton should be quantified and included in assessing the feedback of marine phytoplankton to climate change.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107580"},"PeriodicalIF":3.2,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145199907","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":"Influence of internal island-trapped waves on plankton structure and trophic networks in stratified oligotrophic coastal waters.","authors":"Maja Mucko, Luca Russo, Antonija Matek, Filip Grgurević, Branka Pestorić, Eric P Achterberg, Domenico D'Alelio, Zrinka Ljubešić","doi":"10.1016/j.marenvres.2025.107578","DOIUrl":"https://doi.org/10.1016/j.marenvres.2025.107578","url":null,"abstract":"<p><p>During periods of water column stratification in marine oligotrophic ecosystems, physical forcings such as internal island-trapped waves (ITWs) can facilitate nutrient fluxes to surface waters and determine fine-scale changes in microbial communities. During a two-week in situ experiment at Lastovo Island, South Adriatic Sea, we conducted water-column community diversity assessments with environmental metabarcoding of plankton during and after ITWs events. Bacteria and eukaryotes communities showed significant dissimilarities between size-fraction and depths, with ITW event significantly contributing to clustering of eukaryotic communities. Major bacterial contributors were Gammaproteobacteria, Cyanobacteria, Bacteroidota and Verrucomicrobiota following ITW event. Bacterial functional profiling indicated that ureolysis, aerobic ammonia oxidation, nitrification and ectoparasitic or predatory roles were directly linked to shifting environmental parameters in the water column. Metazoan sequences (mainly Arthropoda, class Copepoda) dominated the micro size fraction, while various dinoflagellates (with high contribution of parasitic Syndiniales) dominated nano and pico size fractions. Primary producers were Mamiellophyceae, Prymnesiophyceae and Bacillariophaceae, with highest relative abundances in the deep chlorophyll maximum (DCM). Assessment of genus-level networks in surface waters and the DCM revealed that about 34 % and 39 % co-occurrences, respectively, were attributable to putative trophic interactions with protists dominating over zooplankton taxa in both communities. Important network taxa connectors were mainly identified among autotrophic protists within DCM, while in surface network connectors number generally decreased.</p>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"107578"},"PeriodicalIF":3.2,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145274909","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}