Marine environmental research最新文献

{"title":"Limited microbial community responses of marine macroalgae to artificial light at night and moderate warming conditions","authors":"Amelia Caley ,&nbsp;Ezequiel M. Marzinelli ,&nbsp;Mariana Mayer-Pinto","doi":"10.1016/j.marenvres.2025.107536","DOIUrl":"10.1016/j.marenvres.2025.107536","url":null,"abstract":"<div><div>Multiple stressors such as Artificial Light at Night (ALAN) and warming are increasingly common in marine systems and can interact in complex ways. Microbial communities play critical roles in the functioning of coastal habitat-forming species such as seaweeds, however the effects of ALAN on seaweed-associated microbial communities remain unknown. We tested the independent and combined effects of ALAN and warming on microbial communities associated with the habitat-forming seaweeds <em>Ecklonia radiata</em> and <em>Sargassum</em> sp. In <em>Eckloni</em>a, ALAN increased the relative abundance of two potentially light-responsive taxa: <em>Dokdonia</em> sp000212355 and an unidentified ASV from Pseudomonadales, whereas warming had the opposite effect. Warming increased microbial community dispersion in <em>Ecklonia</em> and resulted in non-significant increases in relative abundance of putative pathogenic and agarolytic taxa (microbes capable of degrading algal polysaccharides). However, further analyses using metagenomics are needed to confirm functional roles. In contrast, neither ALAN nor warming affected dominant taxa associated with <em>Sargassum</em>. Contrary to expectations, cyanobacteria relative abundance was unaffected by ALAN in either seaweed host, despite their photosynthetic capacity. We found limited evidence for interactive effects of ALAN and warming, and community composition remained unchanged in both seaweed species. Our findings highlight the importance of considering species-specific microbial responses to ALAN and warming, with implications for coastal management.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107536"},"PeriodicalIF":3.2,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046385","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":"Diel movement patterns and abundance of the sea urchin Tripneustes gratilla with comparisons to Echinometra mathaei and their associated ecology at Ningaloo Reef, north-western Australia","authors":"Cindy Bessey ,&nbsp;Erin Scurfield ,&nbsp;Nick Mortimer ,&nbsp;Logan Hellmrich ,&nbsp;Ryan Crossing ,&nbsp;John K. Keesing","doi":"10.1016/j.marenvres.2025.107528","DOIUrl":"10.1016/j.marenvres.2025.107528","url":null,"abstract":"<div><div>Sea urchin herbivory can profoundly modify the benthic habitat and community assemblage of coral reefs making their abundance and movement patterns key features to understanding the role they play in regulating community structure. This study examines the diel movement patterns of <em>Tripneustes gratilla</em>, with comparisons to <em>Echinometra mathaei</em>, and their co-occurrence with other invertebrates, at sites with a high population density on the Ningaloo Reef, Western Australia. Movement rates were measured using long-run underwater stereo-video, while density was measured using belt transects at multiple sites. The size and gut content index of <em>Tripneustes gratilla</em> were also investigated. We observed abundances of <em>T. gratilla</em> (4.29 and 6.02 individuals/m²) exceeding those from areas where outbreak densities have caused significant changes in macroalgal cover. The majority of <em>T. gratilla</em> were in the 60–70 mm size range, and their gut content was significantly higher when collected in the morning indicating that feeding activity may be higher during the night. We also observed greater overall movement patterns for <em>T. gratilla</em> than <em>E. mathaei</em> regardless of site or time of day, with both species exhibiting their highest movement rates at night or in the evening at sites 1 and 2, respectively. Considering the observed movement capacity of <em>T. gratilla</em> in this study, their relatively high abundances, and their significant grazing impact found in previous studies, this species may exert localized pressure on communities in similar habitats. Therefore, we recommend regular monitoring of both macroalgal and urchin populations on Ningaloo Reef.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107528"},"PeriodicalIF":3.2,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046381","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":"Temporal variability in environmental influences on silver croaker (Pennahia argentata) life-history traits in the East China Sea","authors":"Gibril Sesay ,&nbsp;Richard Kindong ,&nbsp;Chunxia Gao ,&nbsp;Shiqing Zhao ,&nbsp;Siquan Tian","doi":"10.1016/j.marenvres.2025.107534","DOIUrl":"10.1016/j.marenvres.2025.107534","url":null,"abstract":"<div><div>Climate change is reshaping marine ecosystems, yet its effects on the life-history traits of commercially important fish species remain insufficiently understood. This study investigates the impact of environmental factors on the growth and survival of silver croaker (<em>Pennahia argentata</em>) in the southern waters of Zhejiang, China, a key fishing ground in the East China Sea. A Life-History Trait Composite Index (LTCI), incorporating von Bertalanffy growth rate (K), mortality (M), average length (L), and asymptotic length (L∞), was used to assess responses to sea surface temperature (SST), sea surface salinity (SSS), dissolved oxygen (DO), and pH across three zones (South, Central, North) from 2015 to 2022. Analyses using Spearman correlation, cross-correlation functions (CCF), Generalized Additive Models (GAM), and Artificial Neural Networks (ANN) revealed zone-specific environmental drivers. pH and SSS emerged as primary influences: pH showed a strong positive correlation with LTCI in the South Zone (<em>r</em> = 0.79) and a moderate effect in the Central Zone (<em>r</em> = 0.44), while SSS had a strong negative impact in the South (<em>r</em> = −0.86) and moderate impact in the Central Zone (<em>r</em> = −0.25). Spearman results also showed contrasting SSS-LTCI correlations, ranging from strongly negative in the South (<em>ρ</em> = −0.89) to positive in the North (<em>ρ</em> = 0.37). GAMs identified nonlinear environmental effects, with SST exerting a significant negative influence in the Central Zone (<em>p</em> = 0.009) and pH having a positive effect (<em>p</em> = 0.046). In the North Zone, delayed oxygen stress and high sea surface salinity corresponded to a 47 % decline in fish size. These results underscore the importance of continuous ecosystem monitoring and highlight pH, DO, and SSS as critical drivers of silver croaker productivity. Region-specific management strategies are recommended: habitat conservation in the South, sea surface salinity and oxygen monitoring in the North, and threshold-based protections in the Central Zone to support sustainable fisheries.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107534"},"PeriodicalIF":3.2,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046356","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":"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","authors":"Dabin Lee ,&nbsp;Jin-Yong Choi ,&nbsp;Huitae Joo ,&nbsp;Hyo Keun Jang ,&nbsp;Sungjun Kim ,&nbsp;Myung Joon Kim ,&nbsp;Yoon Ji Lee ,&nbsp;Sang Heon Lee","doi":"10.1016/j.marenvres.2025.107537","DOIUrl":"10.1016/j.marenvres.2025.107537","url":null,"abstract":"<div><div>The marine fishery resources in South Korea, including <em>Todarodes pacificus</em> (Japanese Common Squid), have experienced significant changes, prompting concern and investigation. This study aimed to develop a habitat suitability index (HSI) model for <em>T</em>. <em>pacificus</em> around South Korea using remote sensing datasets and to analyze its long-term variability. The HSI model was constructed based on the fishing efforts, offering a more accurate representation of habitat distribution for this short-lived species. Key environmental variables−sea surface temperature (SST), sea surface height anomaly (SSHA), chlorophyll-a (Chl-a), and primary productivity (PP)−were identified as critical for the habitat distribution of <em>T. pacificus</em>. The preferred environmental conditions for <em>T. pacificus</em> were found to be 14.64–27.81 °C for SST, 0.32–1.28 mg m⁻³ for Chl-<em>a</em>, −0.04 to 0.2 m for SSHA, and 346–616 mg C m² d⁻¹ for PP. Seasonal HSI models empirically derived demonstrating a strong positive correlation with fishery landings (r = 0.8921). Long-term analysis from 2002 to 2020, using Empirical Mode Decomposition (EEMD), revealed a significant decline in HSI in the East/Japan Sea, which corresponded with a decrease in the annual catch of <em>T. pacificus</em>. This decline in HSI and fishery production is likely influenced by long-term environmental changes, such as ocean warming and declining PP, which may alter habitat conditions and resource availability. These findings highlight the importance of sustained ecosystem monitoring and adaptive management strategies for the conservation of <em>T. pacificus</em>. Further studies focusing on the detailed interactions between climate change-induced environmental changes and the physiological and phenological responses of <em>T. pacificus</em> are crucial to fully understand and address its ongoing population shifts.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107537"},"PeriodicalIF":3.2,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046382","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":"The short-term effects of ocean acidification on the epiphytic bacterial community of Sargassum thunbergii via high-throughput sequencing.","authors":"Kang Ji, Xinlong Yu, Bing Sun, Zhibo Yang, Jing Wang, Yayun Zhao, Tianyi Qiu, Xuexi Tang, Hui Xiao","doi":"10.1016/j.marenvres.2025.107531","DOIUrl":"https://doi.org/10.1016/j.marenvres.2025.107531","url":null,"abstract":"<p><p>Marine macroalgae and their epiphytic bacteria have established a symbiotic relationship. Although the effects of ocean acidification (OA) on macroalgae have been extensively studied, its impact on these epiphytic bacteria remains unclear. This study investigated the OA-induced shifts in the epiphytic bacterial community of Sargassum thunbergii from Qingdao's intertidal zone using 16S rDNA sequencing. The results indicated that elevated CO₂ altered bacterial community structure and function, reducing diversity while maintaining dominant taxa but significantly changing their relative abundances. The abundances of Proteobacteria, Firmicutes, and Verrucomicrobiota declined, whereas Campylobacterota, Desulfobacterota, and Spirochaetota increased. The specific phyla like Cloacimonadota, Calditrichota and Entotheonellaeota also emerged. Based on the analysis of the characteristics of these altered bacterial taxa, it is speculated that these shifts were linked to the environmental adaptability and stress resistance of epiphytic bacteria as well as the metabolic activities of the host algae. Functional predictions revealed that OA primarily affected nitrogen and sulfur metabolism in the epiphytic bacterial community, with effects intensifying over time. Specifically, nitrogen fixation increased, while dark oxidation of sulfur compounds, dark sulfite oxidation, and dark sulfur oxidation decreased. These results suggest that ocean acidification may influence epiphytic bacterial communities through two potential pathways: it could induce abundance changes in bacterial taxa with varying stress resistance and adaptability, while potentially promoting shifts in bacterial taxa closely associated with host algal metabolic activities, which may ultimately lead to restructuring of the epiphytic bacterial community on S. thunbergii. These findings provided new insights into the macroalgae-epiphytic bacteria interactions under ocean acidification and provided important guidance for macroalgal cultivation.</p>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"107531"},"PeriodicalIF":3.2,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145244773","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":"Spatial variation and habitat preference of reef fish and gastropod assemblages from two coastal habitats in subtropical reef, Port Shelter, Hong Kong","authors":"Sam King Fung Yiu ,&nbsp;Thomas Ka Tung Leung ,&nbsp;Gabriel Yeung Lee ,&nbsp;Meng Yan","doi":"10.1016/j.marenvres.2025.107533","DOIUrl":"10.1016/j.marenvres.2025.107533","url":null,"abstract":"<div><div>The complexity of coastal habitats could influence the biodiversity in such areas due to the variability of food availability and refuge protection. Coral reefs and macroalgal beds are two important coastal habitats for sustaining a greater abundance of fishes and invertebrates in marine ecosystems because of high productivity and structural refuge. In Hong Kong, there were highly diverse coral communities and seasonal <em>Sargassum</em> beds. A survey of reef fish and gastropod assemblages was conducted in five coral communities and five <em>Sargassum</em> beds in Sai Kung for three dates by SCUBA diving from March 2023 to May 2023. We found that the mean abundance of reef fish (278.58 ± 40.39 individuals 60 m⁻²) in <em>Sargassum</em> habitats was higher (<em>p</em> &lt; 0.01) than that (134.44 ± 35.13 individuals 60 m⁻²) in coral habitats. The mean gastropod abundance (207.56 ± 25.58 individuals 60 m⁻²) in <em>Sargassum</em> habitats was higher (<em>p &lt;</em> 0.001) than that (64.89 ± 6.65 individuals 60 m⁻²) in coral habitats. The abundance of reef fishes was found to be positively correlated to coral cover (r_S = 0.464, <em>p</em> &lt; 0.01). Moreover, species richness and abundance of reef fishes and gastropods showed no relationship with <em>Sargassum</em> density (Species richness: reef fishes: r_S = 0.013, <em>p</em> &gt; 0.05; gastropods: r_S = 0.100, <em>p</em> &gt; 0.05; Abundance: reef fishes: r_S = 0.231, <em>p</em> &gt; 0.05; gastropods: r_S = 0.217, <em>p</em> &gt; 0.05). Furthermore, the species composition of reef fishes and gastropods from coral habitats was also significantly different (reef fishes: <em>p</em> &lt; 0.001; gastropods: <em>p</em> &lt; 0.001) from <em>Sargassum</em> habitats. Overall, some fish species exhibited habitat specificity by possibly migrating from coral communities to <em>Sargassum</em> beds during the <em>Sargassum</em> growth season or as juveniles to inhabit <em>Sargassum</em> beds for food resources and to avoid predation. In addition, most gastropod species were not habitat-specific, but there might be favorable characteristics in <em>Sargassum</em> beds resulting in higher gastropod abundance. To better understand the coral-reef fish relationship, the abundance of reef fishes was found to be negatively correlated to coral genus diversity (rs = −0.413; <em>p</em> &lt; 0.01). Reef fishes and coral composition also significantly differed (reef fishes: <em>p</em> &lt; 0.001; corals: <em>p</em> &lt; 0.001) among sites, and the reef fish composition can be structured by the coral composition. <em>Acropora</em>, <em>Platygyra</em>, and <em>Pavona</em> were significant variables shaping the reef fish composition, suggesting their presence and coverage as important factors in structuring the reef fish assemblage in a habitat.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107533"},"PeriodicalIF":3.2,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145060926","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":"Functional diversity and spatial distribution of zooplankton communities on the Maranhão continental shelf, Brazilian equatorial Atlantic","authors":"Yago Bruno Silveira Nunes ,&nbsp;Marco Valério Jansen Cutrim ,&nbsp;Xiomara Franchesca Garcia Dias ,&nbsp;Nuno Filipe Alves Correia de Melo ,&nbsp;Ana Karoline Duarte dos Santos Sá ,&nbsp;Quedyane Silva da Cruz","doi":"10.1016/j.marenvres.2025.107509","DOIUrl":"10.1016/j.marenvres.2025.107509","url":null,"abstract":"<div><div>The Maranhão Continental Shelf (MCS), located in the Brazilian equatorial Atlantic, is a dynamic ecosystem characterized by unique environmental gradients and anthropogenic influences. This study investigated the functional diversity and spatial distribution of zooplankton communities, with an emphasis on copepods, which are fundamental components in the transfer of energy between trophic levels. Sampling was conducted across three estuarine zones within the São Marcos Estuarine Complex (SMEC)— Cumã Bay, São Marcos Bay, and São José Bay, allowing for a comprehensive spatial assessment. A total of 98 taxa were identified, with the highest density and biomass recorded in São Marcos, reflecting its relevance as a biodiversity hotspot. Functional diversity analyses revealed significant differences between the transects, with greater functional richness in São Marcos and lower functional richness in São José, highlighting their ecological vulnerability. Predominant functional strategies, such as omnivorous, diurnal vertical migration and broadcast reproduction, have been identified in response to local environmental conditions. Beta diversity indicates species substitution between zones, reinforcing the influence of environmental heterogeneity. This work provides fundamental insights for sustainable management and conservation of MCSs, highlighting the importance of functional trait-based approaches for understanding the resilience of tropical coastal ecosystems.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107509"},"PeriodicalIF":3.2,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046313","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":"Massive carbon inputs from fish farming reduce carbon sequestration capacity in a macroalgae mariculture area","authors":"Wei Yang ,&nbsp;Yingxu Wu ,&nbsp;Yanmei Liu ,&nbsp;Peiqiang Zhuang ,&nbsp;Chenglong Li ,&nbsp;Jianhang Zhang ,&nbsp;Yingfeng Chen ,&nbsp;Yanpei Zhuang ,&nbsp;Hongyang Lin ,&nbsp;Huaji Qiu ,&nbsp;Youjun Huang ,&nbsp;Weijie Qiu ,&nbsp;Wei-Jun Cai ,&nbsp;Liqi Chen ,&nbsp;Di Qi","doi":"10.1016/j.marenvres.2025.107515","DOIUrl":"10.1016/j.marenvres.2025.107515","url":null,"abstract":"<div><div>Macroalgae mariculture is promoted as a marine carbon dioxide removal (mCDR) strategy, particularly in East Asia. In practice, however, macroalgae is frequently co-cultured with fish and shellfish, complicating carbon budgets and potentially altering net carbon metabolism. While most work has emphasized organic carbon cycles, carbonate system responses under integrated aquaculture remain underexplored. In this study, we conducted seasonal surveys in Sansha Bay, one of the world’ largest mariculture zones. Contrary to expectation, the bay persistently outgassed CO₂ during winter (the seaweed growth peak season), spring, and fall. Sea surface CO₂ partial pressure (<em>p</em>CO₂) reached 500–1100 μatm with air-sea CO₂ fluxes of 2.1–7.0 mmol m⁻² d⁻¹. Against an estimated natural background of 200 μatm (a strong sink), long-term effects of cultivation diverged by trophic group: seaweed cultivation lowered <em>p</em>CO₂ by 42 ± 5 μatm, shellfish farming increased it by 36 ± 4 μatm, and fish farming raised it by 375 ± 18 μatm, elevating mean <em>p</em>CO₂ to ∼567 ± 20 μatm and transforming the system from a CO₂ sink to a source. In this semi-enclosed bay, dissolved inorganic carbon (DIC) generated from fish farming overwhelms algal uptake, driving increases in DIC and <em>p</em>CO₂ and reducing the region's carbon sequestration capacity. Seasonal submarine groundwater discharge added ∼30–60 μatm to <em>p</em>CO₂, and short-term mariculture activities could episodically elevate <em>p</em>CO₂ up to 1100 μatm. Analysis of the dissolved inorganic carbon stable carbon isotope (δ¹³C_DIC) indicates that seasonal increases in DIC and <em>p</em>CO₂ in Sansha Bay are due to the decomposition of residual seaweed biomass in late spring and organic matter respiration from fish feed in fall. To achieve mCDR and protect coastal environments, it is essential to reduce formulated feed use or develop alternative environmentally friendly fish farming methods.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107515"},"PeriodicalIF":3.2,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046386","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":"Chemical interactions between filter-feeding mussels and Ulva prolifera: The role of dissolved organic matter and secondary metabolites in growth promotion and competition inhibition of algal species","authors":"Sahr Lamin Sumana ,&nbsp;Sheku Tarawallie ,&nbsp;Samuel Ayeh Osei ,&nbsp;Abdulai Merry Kamara ,&nbsp;Yang Xiaofei ,&nbsp;Amidu Mansaray ,&nbsp;Jianheng Zhang","doi":"10.1016/j.marenvres.2025.107529","DOIUrl":"10.1016/j.marenvres.2025.107529","url":null,"abstract":"<div><div>This review examines the chemical and ecological interactions between filter-feeding mussels and the green macroalga <em>Ulva prolifera</em> in integrated multi-trophic aquaculture (IMTA) systems. Mussels are crucial for nutrient recycling, as they filter water and release bioavailable compounds such as ammonium (NH₄⁺), urea (CO(NH₂)₂), and dissolved organic matter (DOM). These compounds promote <em>Ulva</em> growth and enhance microbial activity. In turn, <em>U. prolifera</em> produces sulfated polysaccharides, phenolics, and halogenated metabolites that can influence microbial communities, suppress competitors, and potentially affect mussel physiology at high concentrations. The review emphasizes the interconnectedness of nutrient exchange, DOM cycling, and microbial genes such as <em>pmoA</em> and <em>mcrA</em>, <em>highlighting the novelty of integrating microbial ecology with biogeochemical cycles</em> and ecosystem outcomes, illustrating both the synergies and risks present in co-culture systems. While moderate production of metabolites helps control biofouling and maintain ecosystem stability, excessive DOM or allelochemical accumulation can hinder mussel filtration and lead to hypoxia. Maintaining specific thresholds, such as DOM concentrations below 5 mg C/L and labile-to-refractory DOM ratios above 1:1, is essential for balance. This synthesis integrates microbial ecology, metabolite feedbacks, and biogeochemical processes to provide a framework for resilient IMTA design. It also emphasizes practical strategies like <em>adjusting stocking densities, optimizing water exchange, and employing microbial monitoring tools</em> to promote sustainable IMTA practices. By linking molecular interactions to ecosystem-scale outcomes, the review offers guidance for sustainable aquaculture systems that enhance productivity, minimize environmental risks, and improve resilience in the face of climate stress.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107529"},"PeriodicalIF":3.2,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145010907","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":"The role of emersion time in modulating biomarker responses to pollution in intertidal mollusks","authors":"María V. Laitano,&nbsp;Clara Liebana,&nbsp;Ivana S. Friedman,&nbsp;Yamila E. Rodriguez","doi":"10.1016/j.marenvres.2025.107532","DOIUrl":"10.1016/j.marenvres.2025.107532","url":null,"abstract":"<div><div>The intertidal zone is a stressful environment where organisms must develop adaptive responses to each emersion cycle. Therefore, when studying the effects of pollution on intertidal organisms, this factor should be considered. However, the interactive effects of pollution and emersion time on invertebrates at the same intertidal level remain largely unexplored. This study aimed to investigate the influence of air exposure time on the immunological and antioxidative biomarkers of two intertidal mollusk species to pollution. Limpets (<em>Siphonaria lessoni</em>) and mussels (<em>Brachidontes rodriguezii</em>) were collected from two polluted harbor sites (QQ and MDP) and a reference site (RCT) at different emersion times: 0, 2, and 4 h. Biomarkers measured included phenoloxidase (PO), alkaline phosphatase (AP), glutathione-S-transferase (GST), and catalase (CAT) activities, as well as thiobarbituric acid reactive substances (TBARs) levels. In general, individuals exposed to air showed exacerbated biomarker responses to pollution, even at the shortest emersion time (2 h). Conversely, limpets and mussels from RCT showed increased enzyme activity only after 4 h of emersion, suggesting greater resistance to emersion stress, likely due to a healthier environment. Additionally, air exposure enhanced TBARs levels in limpets (&gt;190 % in MDP; &gt;300 % in QQ) and mussels (&gt;260 % in QQ) from contaminated harbor sites, while organisms from the reference site showed no such changes. Overall, the magnitude of differences between polluted and unpolluted sites was dependent on the timing of organism collection during emersion for most of the biomarkers/situations studied. Thus, our results highlight how air exposure time can confound biochemical responses to pollution, emphasizing the importance of considering emersion duration when assessing the physiological status of intertidal organisms in polluted ecosystems. These findings should be interpreted within the broader context of multiple environmental and biological factors that collectively shape pollution responses in intertidal communities.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"212 ","pages":"Article 107532"},"PeriodicalIF":3.2,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046383","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}