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Synergistic effects of the antibiotic ciprofloxacin and a simulated heatwave on the Baltic Sea dinoflagellate Apocalathium malmogiense
IF 3 3区 环境科学与生态学
Marine environmental research Pub Date : 2025-04-19 DOI: 10.1016/j.marenvres.2025.107155
Sabrina K. Roth , Catharina Uth , Iris Orizar , Andreu Rico , Per Hedberg , Alf Norkko , Aleksandra Lewandowska
{"title":"Synergistic effects of the antibiotic ciprofloxacin and a simulated heatwave on the Baltic Sea dinoflagellate Apocalathium malmogiense","authors":"Sabrina K. Roth ,&nbsp;Catharina Uth ,&nbsp;Iris Orizar ,&nbsp;Andreu Rico ,&nbsp;Per Hedberg ,&nbsp;Alf Norkko ,&nbsp;Aleksandra Lewandowska","doi":"10.1016/j.marenvres.2025.107155","DOIUrl":"10.1016/j.marenvres.2025.107155","url":null,"abstract":"<div><div>Climate change-driven heatwaves in the Baltic Sea are becoming more frequent and intense, potentially exacerbating phytoplankton blooms that impact biodiversity and ecosystem functioning. Alongside this, chemical pollutants, such as antibiotics, may compound these effects. This study examined the combined impacts of a simulated heatwave (+5 °C) and the antibiotic ciprofloxacin (0.1 μg L<sup>−1</sup>) on the dinoflagellate <em>Apocalathium malmogiense</em>. We assessed cell counts, size, growth rates, Chlorophyll-a (Chl-a) content, and nutrient uptake. The simulated heatwave increased growth and Chl-a content but reduced cell size, while ciprofloxacin alone had no effect on growth response parameters. However, the combination of both stressors significantly reduced cell counts (−17 %), Chl-a content (−34 %), and growth rates (−20 %). Ciprofloxacin also decreased nitrogen uptake by over 40 %, exacerbating the nitrogen deficit caused by the heatwave. This study highlights the importance of testing global change stressors in combination, as synergistic effects may otherwise go undetected if only studied in isolation.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"208 ","pages":"Article 107155"},"PeriodicalIF":3.0,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850581","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}
引用次数: 0
Invasive blue vs. local Green: analysis of substrate preference of two crab species, Callinectes sapidus and Carcinus aestuarii
IF 3 3区 环境科学与生态学
Marine environmental research Pub Date : 2025-04-18 DOI: 10.1016/j.marenvres.2025.107164
Filippo Piccardi , Claudio Bortot , Luca Brunoni , Federica Poli , Gil Guastoni Rosenthal , Carlotta Mazzoldi , Alberto Barausse
{"title":"Invasive blue vs. local Green: analysis of substrate preference of two crab species, Callinectes sapidus and Carcinus aestuarii","authors":"Filippo Piccardi ,&nbsp;Claudio Bortot ,&nbsp;Luca Brunoni ,&nbsp;Federica Poli ,&nbsp;Gil Guastoni Rosenthal ,&nbsp;Carlotta Mazzoldi ,&nbsp;Alberto Barausse","doi":"10.1016/j.marenvres.2025.107164","DOIUrl":"10.1016/j.marenvres.2025.107164","url":null,"abstract":"<div><div>Introduced primarily via ballast waters, the Atlantic Blue Crab, <em>Callinectes sapidus</em>, has spread throughout the Mediterranean Sea exhibiting a highly invasive behaviour. In introduced ecosystems it is posing a threat to local species and economic activities. This study compares, for the first time, habitat preference of <em>C. sapidus</em> and the native green crab, the Mediterranean Shore Crab <em>Carcinus aestuarii</em>, in the Venice Lagoon. Sediment samples from natural sandy bottoms, as well as from natural and artificial saltmarshes were used to assess substrate preference (time spent on each substrate) of both species under controlled laboratory conditions. Sediment composition was characterized by granulometric analysis, to assess differences in the sediment structure of the samples. Behavioural observations indicated that <em>C. sapidus</em> exhibits a preference for substrates with larger grain size, that characterized both natural bottoms and artificial saltmarshes, whereas <em>C. aestuarii</em> showed no specific substrate preference. Moreover, <em>C. sapidus</em> demonstrated significantly higher burrowing activity, likely due to its adaptation to sandy environments and burrowing behaviour as a predation avoidance strategy. Hydro-morphological alterations driven by both human-driven erosion and by restoration actions are increasing the sandy component of the Venice lagoon sediments across habitats. As a result, the blue crab may potentially thrive in wider areas. Our findings have implications for conservation and management, as the expansion of <em>C. sapidus</em> could further threaten <em>C. aestuarii</em> populations through competition and predation, exacerbating the decline of local artisanal fisheries.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"208 ","pages":"Article 107164"},"PeriodicalIF":3.0,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143851428","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}
引用次数: 0
Integrating traditional and innovative monitoring approaches to monitor the marine biodiversity in the Tyrrhenian Sea (Mediterranean sea)
IF 3 3区 环境科学与生态学
Marine environmental research Pub Date : 2025-04-16 DOI: 10.1016/j.marenvres.2025.107160
E. Fasola , C. Santolini , B. Villa , A. Zanoletti , G. Magni , J. Pachner , F. Stefani , G. Boldrocchi , R. Bettinetti
{"title":"Integrating traditional and innovative monitoring approaches to monitor the marine biodiversity in the Tyrrhenian Sea (Mediterranean sea)","authors":"E. Fasola ,&nbsp;C. Santolini ,&nbsp;B. Villa ,&nbsp;A. Zanoletti ,&nbsp;G. Magni ,&nbsp;J. Pachner ,&nbsp;F. Stefani ,&nbsp;G. Boldrocchi ,&nbsp;R. Bettinetti","doi":"10.1016/j.marenvres.2025.107160","DOIUrl":"10.1016/j.marenvres.2025.107160","url":null,"abstract":"<div><div>The Mediterranean Sea, a global biodiversity hotspot, is increasingly threatened by anthropogenic pressures, leading to a decline in marine biodiversity and ecosystem services. In response, effective monitoring and conservation strategies, including citizen science initiatives, are crucial for understanding and mitigating these impacts. This study presents the <em>Marine Adventure for Research and Education</em> (M.A.R.E.) initiative, which integrates public participation in marine biodiversity monitoring through visual surveys and environmental DNA (eDNA) sampling. Novel species-specific primers were developed to target key species, including Risso's dolphin, fin whale, basking shark, loggerhead sea turtle, and sperm whale. Over three months, approximately 100 participants contributed to the detection of endangered marine species, including the loggerhead sea turtle, striped dolphin, fin whale, and basking shark, in the Tyrrhenian Sea. Thus, eDNA analysis proved to be a highly sensitive and non-invasive method for detecting a wide range of species, complementing traditional visual surveys. As a matter of fact, the second most detected species with molecular analyses was the Risso's dolphin, an elusive species previously underreported in the region. Thus, this study suggests that eDNA technique might be considered a promising technique to monitor the Risso's dolphin distribution in the Mediterranean Sea.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"208 ","pages":"Article 107160"},"PeriodicalIF":3.0,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844657","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}
引用次数: 0
The effects of thermal conditions and canopy density on Posidonia oceanica seedlings: implications for future seagrass restoration
IF 3 3区 环境科学与生态学
Marine environmental research Pub Date : 2025-04-16 DOI: 10.1016/j.marenvres.2025.107161
Patrizia Stipcich , Arianna Pansini , Roberto Rubattu , Giulia Ceccherelli
{"title":"The effects of thermal conditions and canopy density on Posidonia oceanica seedlings: implications for future seagrass restoration","authors":"Patrizia Stipcich ,&nbsp;Arianna Pansini ,&nbsp;Roberto Rubattu ,&nbsp;Giulia Ceccherelli","doi":"10.1016/j.marenvres.2025.107161","DOIUrl":"10.1016/j.marenvres.2025.107161","url":null,"abstract":"<div><div>Seagrass restoration have been significantly increased worldwide and the use of seedlings have been encouraged. To successfully use seedlings in restoration, understanding the factors that affect their growth has become pivotal. This study aimed at evaluating the development of the Mediterranean seagrass <em>Posidonia oceanica</em> seedlings in different thermal environments by cross-transplantation between the eastern and western coast of Sardinia (Italy), and in several <em>P. oceanica</em> canopy densities. The thermal conditions of receiving and donor sites did not affect the development of <em>P. oceanica</em> seedlings, since seedlings from the same origin developed consistently in both sites, highlighting a good acclimation. Furthermore, seedlings germinated in dead matte or low canopy density generally showed a higher development, providing good insights for future restoration actions.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"208 ","pages":"Article 107161"},"PeriodicalIF":3.0,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850578","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}
引用次数: 0
Comparative transcriptome analysis reveals the response mechanism of the typical marine ciliate Euplotes vannus to heavy metal cadmium exposure
IF 3 3区 环境科学与生态学
Marine environmental research Pub Date : 2025-04-15 DOI: 10.1016/j.marenvres.2025.107153
Yingxuan Tian , Congjun Li , Yu Fu , Eleni Gentekaki , Lifang Li
{"title":"Comparative transcriptome analysis reveals the response mechanism of the typical marine ciliate Euplotes vannus to heavy metal cadmium exposure","authors":"Yingxuan Tian ,&nbsp;Congjun Li ,&nbsp;Yu Fu ,&nbsp;Eleni Gentekaki ,&nbsp;Lifang Li","doi":"10.1016/j.marenvres.2025.107153","DOIUrl":"10.1016/j.marenvres.2025.107153","url":null,"abstract":"<div><div>Cadmium (Cd) is one of the major heavy metal pollutants. High concentrations of Cd in surface sediments have led to serious damage to marine ecosystems and threatened the health of marine organisms. <em>Euplotes vannus</em>, a marine epiphytic ciliate, is susceptible to Cd in sediments as a model unicellular eukaryote without the cell wall. This study used <em>Euplotes vannus</em> as a test organism to investigate the biotoxicity of Cd and the response mechanisms of marine microorganisms to Cd. The results showed that <em>Euplotes vannus</em> showed high tolerance to Cd<sup>2+</sup> (24 h-LC<sub>50</sub> = 38.75 mg/L). We found that Cd inhibited the population growth of <em>E. vannus</em> in a dose-dependent manner. This may be due to the cellular Cd<sup>2+</sup> uptake leads to a series of negative cellular effects, including DNA damage, protein damage and mitochondrial disruption. These oxidative damages led to a rapidly increased activities of four antioxidant enzymes (SOD, CAT, POD and GSH-PX) in <em>Euplotes vannus</em>. Furthermore, transcriptome analysis indicated that transporter proteins could be involved in Cd<sup>2+</sup> efflux, and the expression of genes for DNA repair, energy metabolism, and protein synthesis was also significantly changed. These play a crucial role in stabilizing cellular gene expression, providing energy support and maintaining cell growth. In addition, we found that ribosome biogenesis, glutathione metabolism and mitochondrial biogenesis pathways were significantly enriched. The differential expression of these genes indicates that Cd exposure induces a wide range of post-transcriptional regulatory mechanisms in <em>Euplotes vannus</em> to enhance tolerance to Cd.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"208 ","pages":"Article 107153"},"PeriodicalIF":3.0,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850579","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}
引用次数: 0
Benthic foraminifera as bioindicators of coral condition near mangrove environments
IF 3 3区 环境科学与生态学
Marine environmental research Pub Date : 2025-04-15 DOI: 10.1016/j.marenvres.2025.107159
Dayana Chadda-Harmer , Maria Byrne , Claire E. Reymond , Thomas E. Fellowes , Emma F. Camp , Shawna A. Foo
{"title":"Benthic foraminifera as bioindicators of coral condition near mangrove environments","authors":"Dayana Chadda-Harmer ,&nbsp;Maria Byrne ,&nbsp;Claire E. Reymond ,&nbsp;Thomas E. Fellowes ,&nbsp;Emma F. Camp ,&nbsp;Shawna A. Foo","doi":"10.1016/j.marenvres.2025.107159","DOIUrl":"10.1016/j.marenvres.2025.107159","url":null,"abstract":"<div><div>Climate change stressors such as ocean warming, acidification and deoxygenation are severely threatening coral reefs and the vital ecosystem services they provide. Corals found to survive in mangrove habitats that naturally possess stressful conditions, are being increasingly studied to investigate the impact of multiple co-occurring stressors on coral growth. However, the water quality within mangrove-coral habitats and how this changes with varying distance from the mangroves remains largely unknown. We used the Foraminifera in Reef Assessment and Monitoring Index (FORAM Index) to assess the suitability of environments for coral growth across a mangrove to reef gradient. Sediment samples were collected from five sites at varying proximity to the Low Isles mangroves in the northern Great Barrier Reef. Sites were located: amongst the inner mangroves, the mangrove fringe, the adjacent leeward and windward reef margins and at Opal Reef (control) 38 km away from the mangroves. Foraminiferal community assemblages were used to determine the environmental suitability for coral growth and recovery. The poorest seawater conditions for coral occurred at the inner mangrove site with water quality improving outside the mangroves. Leeward and windward margin sites differed in their suitability for coral growth despite being a similar distance from the mangroves, indicating that water conditions were not necessarily constrained by proximity to mangroves alone. These findings have important implications for studies investigating mangrove-coral habitats as refugia and for assessing linkages between coral reefs and mangroves – two highly threatened tropical ecosystems.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"209 ","pages":"Article 107159"},"PeriodicalIF":3.0,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860674","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}
引用次数: 0
Long-term variability in sea surface temperature and chlorophyll-a concentration in the Pacific region off Baja California
IF 3 3区 环境科学与生态学
Marine environmental research Pub Date : 2025-04-14 DOI: 10.1016/j.marenvres.2025.107156
Ricardo García-Morales , Edgardo B. Farach-Espinoza , Hugo Herrera-Cervantes , Manuel O. Nevárez-Martínez , Juana López-Martínez
{"title":"Long-term variability in sea surface temperature and chlorophyll-a concentration in the Pacific region off Baja California","authors":"Ricardo García-Morales ,&nbsp;Edgardo B. Farach-Espinoza ,&nbsp;Hugo Herrera-Cervantes ,&nbsp;Manuel O. Nevárez-Martínez ,&nbsp;Juana López-Martínez","doi":"10.1016/j.marenvres.2025.107156","DOIUrl":"10.1016/j.marenvres.2025.107156","url":null,"abstract":"<div><div>The Pacific region off Baja California (PBC) is part of the California Current System (CCS), its high energy flux and transition zone between mid-latitude and tropical ocean conditions make it one of the most productive regions in the world. Given the variability of sea surface temperature (SST) and chlorophyll-a (Chl-a) in this area, it is necessary to establish regions for their independent study and the relationships between them. We used satellite imagery and cluster analysis to group stations with greatest homogeneity in these variables and regionalize the PBC. We evaluated the seasonal and interannual variability of SST and Chl-a from 2000 to 2022 and analyzed the associations of interannual variability with El Niño Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO). Results revealed seven bioregions characterized by strong latitudinal gradients in SST and Chl-a, with northern bioregions showing higher productivity than the southern ones. All bioregions showed strong seasonal and interannual variation in SST and Chl-a. Interannual (3–8 years) and decadal (10–12 years) cycles associated with ENSO and PDO were observed. A period (2000–2012) of cold-eutrophic conditions was observed, followed by a second period (2013–2022) of warm-oligotrophic waters. In this second period, “the Blob”, a very strong El Niño and a positive PDO phase had combined effects on the study area, significantly increasing SST and decreasing Chl-a, with no subsequent recovery to pre-2013 values after these three major events ceased. Additionally, all bioregions moved northwards, the southern ones covering larger areas, suggesting water tropicalization linked to global warming.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"208 ","pages":"Article 107156"},"PeriodicalIF":3.0,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855375","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}
引用次数: 0
Diatom Chaetoceros calcitarans MZB-1 for degrading propylbenzenes in seawater: Cultivation conditions, degradation kinetics, and influencing factors
IF 3 3区 环境科学与生态学
Marine environmental research Pub Date : 2025-04-14 DOI: 10.1016/j.marenvres.2025.107154
Yu Leng , Yumei Li , Fanping Meng , Wenjia Sun
{"title":"Diatom Chaetoceros calcitarans MZB-1 for degrading propylbenzenes in seawater: Cultivation conditions, degradation kinetics, and influencing factors","authors":"Yu Leng ,&nbsp;Yumei Li ,&nbsp;Fanping Meng ,&nbsp;Wenjia Sun","doi":"10.1016/j.marenvres.2025.107154","DOIUrl":"10.1016/j.marenvres.2025.107154","url":null,"abstract":"<div><div>Accidental leakage of petrochemical products (such as C9 aromatics) containing propylbenzenes (PBZs) during maritime transport poses severe threats to marine ecosystems. In this study, a PBZs-degrading diatom, <em>Chaetoceros calcitrans</em> MZB-1, was isolated from the seawater close to Quangang Port, Fujian Province, China, where a serious spill of C9 aromatics previously occurred several years ago. The optimal growth conditions for this alga were pH 8.5, salinity 10 ‰, temperature 25 °C and light intensity 60 μmol/(m<sup>2</sup>·s). At the optimal inoculation density (1 × 10<sup>6</sup> cells/mL), removal efficiencies of two PBZs, namely n-propylbenzene (n-PBZ) and isopropylbenzene (i-PBZ), were 68.6 % and 44.6 %, respectively, within 7 days. The elimination of each PBZ over time followed the first-order kinetic model. After adding 750 mg/L and 500 mg/L of NaHCO<sub>3</sub> into the F/2 medium, the removal efficiencies of two PBZs increased to 70.8 % and 51.2 %, respectively. These results showed that alga MZB-1 could be more effectively used for bioremediation of PBZs-contaminated seawater than the one previously isolated.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"208 ","pages":"Article 107154"},"PeriodicalIF":3.0,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855376","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}
引用次数: 0
Changes in macrozoobenthic assemblages of a coastal lagoon in the context of long-term human pressures and a eutrophication process
IF 3 3区 环境科学与生态学
Marine environmental research Pub Date : 2025-04-12 DOI: 10.1016/j.marenvres.2025.107145
A. Sala-Mirete, C. Marcos, M. Vicente-Ríos, O. Sánchez-Fernández, J. Texier, A. Pérez-Ruzafa
{"title":"Changes in macrozoobenthic assemblages of a coastal lagoon in the context of long-term human pressures and a eutrophication process","authors":"A. Sala-Mirete,&nbsp;C. Marcos,&nbsp;M. Vicente-Ríos,&nbsp;O. Sánchez-Fernández,&nbsp;J. Texier,&nbsp;A. Pérez-Ruzafa","doi":"10.1016/j.marenvres.2025.107145","DOIUrl":"10.1016/j.marenvres.2025.107145","url":null,"abstract":"<div><div>Coastal lagoons have long been perceived as simple, uniform and naturally stressed habitats, but recent research reveals that these ecosystems may be more complex, heterogeneous, and structured than anticipated, with an unexpected homeostatic and resilience capacity to respond to anthropogenic pressures. In addition, they are considered among the ecosystems with the highest biological productivity and among the most valuable in terms of socioeconomic importance. However, they face numerous challenges and an almost general lack of planning that hinders effective protection against anthropogenic pressures like agriculture, fishing, aquaculture, mining, tourism, coastal works, industrial pollution or eutrophication. This study represents a long-term analysis of changes in the composition and structure of the macrozoobenthic assemblages of the main habitats of the Mar Menor coastal lagoon, and their response to a severe eutrophic break episode, framed in the eutrophication process and human pressures that the lagoon has been suffering for the last 40 years.</div><div>Four time periods have been studied, since the 1980s, established as a reference for the quality of lagoon benthic communities. 99 taxa (3 Phyla, 1 Class and 95 Families) have been identified. The main environmental characteristics and assemblage descriptors in the seven more representative hard and soft bottom habitats of the lagoon have served to discuss the process of change that they have been undergoing and their spatiotemporal variability.</div><div>The dynamics of the communities is the result of multiple processes that interact with human impacts. The mechanisms that have permitted maintaining the ecosystem integrity for more than two decades of nutrient input are mainly based on the channelling of primary production towards benthic communities, and the export of excess production. During the periods of high and more or less abrupt increases in the input of nutrients, the ecosystem responds by increasing the populations of some species and trophic strategies in a sequence of filter-feeders, herbivorous and deposit feeders. All this in a complex scenario of spatial and temporal heterogeneity of the environmental conditions and biological assemblages, and species replacement in a framework of restricted connectivity and random colonization from the open sea.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"208 ","pages":"Article 107145"},"PeriodicalIF":3.0,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855466","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}
引用次数: 0
Toxic effects and transcriptome analysis of the early life stages of Larimichthys crocea exposed to the bloom-forming dinoflagellate Alexandrium tamarense
IF 3 3区 环境科学与生态学
Marine environmental research Pub Date : 2025-04-12 DOI: 10.1016/j.marenvres.2025.107140
Yongqi Cai , Anglu Shen , Hongtao Liu , Chongfeng Liu , Wantu Xu , Rui Jia
{"title":"Toxic effects and transcriptome analysis of the early life stages of Larimichthys crocea exposed to the bloom-forming dinoflagellate Alexandrium tamarense","authors":"Yongqi Cai ,&nbsp;Anglu Shen ,&nbsp;Hongtao Liu ,&nbsp;Chongfeng Liu ,&nbsp;Wantu Xu ,&nbsp;Rui Jia","doi":"10.1016/j.marenvres.2025.107140","DOIUrl":"10.1016/j.marenvres.2025.107140","url":null,"abstract":"<div><div>This study investigated the effects of the bloom-forming dinoflagellate <em>Alexandrium tamarense</em> and its potentially associated paralytic shellfish toxins on the early life stages of <em>Larimichthys crocea</em> (large yellow croaker) by integrating physiological effects with transcriptomic analysis to explore the molecular mechanisms underlying these harmful impacts. The results showed that 48-h acute exposure to <em>A. tamarense</em> culture and cell-free filtrate significantly reduced the heart rate in embryos and increased mortality rates in both embryos and larvae. Transcriptome sequencing of the filtrate-exposed group identified 130 differentially expressed genes in the embryo group and 884 in the juvenile group. Further analysis revealed that algal exposure triggered the activation of innate immunity in embryos, as evidenced by the significant upregulation of immune-related cytokines such as <em>CCL20</em>, <em>IL11</em>, and <em>ILRA10</em>. These genes were enriched in the cytokine-cytokine receptor interaction pathway and may induce immune responses through their respective downstream pathways. Additionally, the downregulation of the RNA polymerase and ribosome pathways suggests that protein synthesis was affected during the embryo stress response induced by <em>A</em>. <em>tamarense</em>. In juveniles, genes related to cardiac function, particularly those associated with myocardial contraction and calcium ion regulation, were downregulated after exposure to algal filtrate, further suggesting that <em>A. tamarense</em>, possibly through paralytic shellfish toxins, inhibits the heart function of <em>L. crocea</em>. The findings of this study elucidate the toxicological mechanisms of <em>A. tamarense</em> on the early life stages of <em>L. crocea</em>, providing scientific evidence for the impact of harmful algal blooms on marine life health and offering valuable insights for management strategies in aquaculture.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"208 ","pages":"Article 107140"},"PeriodicalIF":3.0,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844658","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}
引用次数: 0
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