Marine environmental research最新文献

Neustonic zooplankton communities across distinct summer water masses in the northern East China Sea

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2025-03-15 DOI: 10.1016/j.marenvres.2025.107088

Jang Han Choi , Geon Kim , Yoonja Kang , Chang-Keun Kang , Taejin Kim , Ho Young Soh

Marine neustonic zooplankton are subject to extreme fluctuations in environmental conditions, including water temperature, salinity, and ocean currents. This study examined the community structure of neustonic zooplankton, focusing on copepods, across distinct continental shelf water masses in the northern East China Sea, where coastal and oceanic waters converge. Neustonic zooplankton samples were collected using a neuston net from three regions surrounding Jeju Island, Korea, during June, August, and September 2021. Environmental parameters, such as water temperature, salinity, size-fractioned chlorophyll a concentrations, and suspended particulate matter, were measured. The neustonic copepod community in each region was categorized into two groups based on water masses: Yangtze River Diluted Water (YRDW) versus the remaining shelf water in June; YRDW versus Tsushima Warm Current (TWC) in August; and mixed waters (South Korean Coastal Water, SKCW) versus TWC in September. The spatial distribution of neustonic zooplankton was primarily influenced by distinct water masses. Coastal indicator species (Paracalanus parvus sensu lato (s. l.), Labidocera rotunda, and Ditrichocorycaeus affinis) were significantly correlated with chlorophyll a concentrations in YRDW and SKCW, conversely, water temperature and salinity were closely associated with the abundance of high-salinity indicator species (Canthocalanus pauper, Temora discaudata, Centropages furcatus, and Undinula vulgaris) in the TWC. Additionally, oceanic indicator species correlated with multiple environmental factors across all water masses. These findings suggest that, during summer, the inflow of YRDW influences the spatial conditions in the study area. Moreover, indicator species can serve as valuable markers of water mass fluctuations.

{"title":"Neustonic zooplankton communities across distinct summer water masses in the northern East China Sea","authors":"Jang Han Choi , Geon Kim , Yoonja Kang , Chang-Keun Kang , Taejin Kim , Ho Young Soh","doi":"10.1016/j.marenvres.2025.107088","DOIUrl":"10.1016/j.marenvres.2025.107088","url":null,"abstract":"<div><div>Marine neustonic zooplankton are subject to extreme fluctuations in environmental conditions, including water temperature, salinity, and ocean currents. This study examined the community structure of neustonic zooplankton, focusing on copepods, across distinct continental shelf water masses in the northern East China Sea, where coastal and oceanic waters converge. Neustonic zooplankton samples were collected using a neuston net from three regions surrounding Jeju Island, Korea, during June, August, and September 2021. Environmental parameters, such as water temperature, salinity, size-fractioned chlorophyll <em>a</em> concentrations, and suspended particulate matter, were measured. The neustonic copepod community in each region was categorized into two groups based on water masses: Yangtze River Diluted Water (YRDW) versus the remaining shelf water in June; YRDW versus Tsushima Warm Current (TWC) in August; and mixed waters (South Korean Coastal Water, SKCW) versus TWC in September. The spatial distribution of neustonic zooplankton was primarily influenced by distinct water masses. Coastal indicator species (<em>Paracalanus parvus</em> sensu lato (s. l.), <em>Labidocera rotunda</em>, and <em>Ditrichocorycaeus affinis</em>) were significantly correlated with chlorophyll <em>a</em> concentrations in YRDW and SKCW, conversely, water temperature and salinity were closely associated with the abundance of high-salinity indicator species (<em>Canthocalanus pauper</em>, <em>Temora discaudata</em>, <em>Centropages furcatus</em>, and <em>Undinula vulgaris</em>) in the TWC. Additionally, oceanic indicator species correlated with multiple environmental factors across all water masses. These findings suggest that, during summer, the inflow of YRDW influences the spatial conditions in the study area. Moreover, indicator species can serve as valuable markers of water mass fluctuations.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"207 ","pages":"Article 107088"},"PeriodicalIF":3.0,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644711","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

Physiological responses of scleractinian coral to trace metal enrichment and thermal stress

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2025-03-14 DOI: 10.1016/j.marenvres.2025.107085

Ting-Hsuan Tu , Hung-Yen Hsieh , Pei-Jie Meng , Chung-Chi Chen

Coral bleaching events are increasingly frequent due to global climate change and marine pollution. Trace metals, such as manganese (Mn) and iron (Fe), though toxic at high concentrations, are vital for coral physiology, supporting photosynthesis and antioxidation. This study investigates how thermal stress and trace metal exposure interact to influence the physiology of the scleractinian corals Turbinaria irregularis and Montipora mollis. Corals were exposed to Mn and Fe at varying concentrations under control (25 °C) and elevated (30 °C) temperatures. Mn enhanced photosynthetic efficiency, an increase of 1.7°% in M. mollis at 250 nM and 1.4°% in T. irregularis at 30 °C (p < 0.05). Fe improved photosynthesis by 1.8°% in M. mollis at 50 nM and growth rates by 2.1°% in T. irregularis at 25 °C (p < 0.05). Both metals mitigated bleaching, as seen in reduced relative gray intensity and increased symbiotic algal density, particularly at moderate concentrations. However, elevated temperatures suppressed growth and photosynthetic efficiency, with decreases up to 1.6°% in M. mollis (p < 0.01). These results highlight the pivotal role of trace metals in coral health and stress resilience, while emphasizing the importance of species-specific differences in trace metal uptake, thermal tolerance, and physiological responses. Further studies are necessary to elucidate the mechanisms and long-term impacts of these interactions in the face of ongoing climate change.

{"title":"Physiological responses of scleractinian coral to trace metal enrichment and thermal stress","authors":"Ting-Hsuan Tu , Hung-Yen Hsieh , Pei-Jie Meng , Chung-Chi Chen","doi":"10.1016/j.marenvres.2025.107085","DOIUrl":"10.1016/j.marenvres.2025.107085","url":null,"abstract":"<div><div>Coral bleaching events are increasingly frequent due to global climate change and marine pollution. Trace metals, such as manganese (Mn) and iron (Fe), though toxic at high concentrations, are vital for coral physiology, supporting photosynthesis and antioxidation. This study investigates how thermal stress and trace metal exposure interact to influence the physiology of the scleractinian corals <em>Turbinaria irregularis</em> and <em>Montipora mollis</em>. Corals were exposed to Mn and Fe at varying concentrations under control (25 °C) and elevated (30 °C) temperatures. Mn enhanced photosynthetic efficiency, an increase of 1.7°% in <em>M. mollis</em> at 250 nM and 1.4°% in <em>T. irregularis</em> at 30 °C (<em>p</em> < 0.05). Fe improved photosynthesis by 1.8°% in <em>M. mollis</em> at 50 nM and growth rates by 2.1°% in <em>T. irregularis</em> at 25 °C (<em>p</em> < 0.05). Both metals mitigated bleaching, as seen in reduced relative gray intensity and increased symbiotic algal density, particularly at moderate concentrations. However, elevated temperatures suppressed growth and photosynthetic efficiency, with decreases up to 1.6°% in <em>M. mollis</em> (<em>p</em> < 0.01). These results highlight the pivotal role of trace metals in coral health and stress resilience, while emphasizing the importance of species-specific differences in trace metal uptake, thermal tolerance, and physiological responses. Further studies are necessary to elucidate the mechanisms and long-term impacts of these interactions in the face of ongoing climate change.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"207 ","pages":"Article 107085"},"PeriodicalIF":3.0,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644710","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

Acute toxicity of antifouling agents CuSO₄, ZnPT, and CuPT on marine diatoms Skeletonema costatum and Navicula sp.

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2025-03-12 DOI: 10.1016/j.marenvres.2025.107084

Taesoo Kim, Huijeong Byeon, Yunji An, Vijay Rayamajhi, Jihyun Lee, Jong Dae Lee, Kwang Soo Lee, Chul-Hyun Kim, Juwon Oh, Jung Han Park, Hyun Woung Shin, Sang Mok Jung

Substrates exposed to the marine environment frequently undergo biofouling, which can result in both pollution and economic losses. Biofouling can be prevented using antifouling paints to inhibit the growth of adherent organisms. Since the ban of tributyltin, most antifouling agents are primarily copper -based mixtures, such as ZnPT and CuPT. To assess the environmental impacts of various antifouling agents, toxicity tests were conducted using the diatoms Skeletonema costatum and Navicula sp. For toxicity assessment, diatoms were exposed to CuSO₄, ZnPT, and CuPT for 72 h, yielding EC₅₀ values for S. costatum of 1,524 μg/L, 1.06 μg/L, and 0.46 μg/L, respectively, and for Navicula sp. of 793.8 μg/L, 254.8 μg/L, and 75.93 μg/L, respectively. Both diatoms exhibited sensitivity in the order CuPT > ZnPT > CuSO₄. Further tests of the combined effects of CuSO₄ and ZnPT revealed that mixing these biocides at their EC10 values produced greater toxicity than their individual effects. Although research concerning the synergistic effects of toxic mixtures is advancing, studies of epiphytic diatoms have been limited. Therefore, further research focused on toxicity and environmental effects among diatoms under various conditions is necessary.

{"title":"Acute toxicity of antifouling agents CuSO<sub>4</sub>, ZnPT, and CuPT on marine diatoms Skeletonema costatum and Navicula sp.","authors":"Taesoo Kim, Huijeong Byeon, Yunji An, Vijay Rayamajhi, Jihyun Lee, Jong Dae Lee, Kwang Soo Lee, Chul-Hyun Kim, Juwon Oh, Jung Han Park, Hyun Woung Shin, Sang Mok Jung","doi":"10.1016/j.marenvres.2025.107084","DOIUrl":"https://doi.org/10.1016/j.marenvres.2025.107084","url":null,"abstract":"<p><p>Substrates exposed to the marine environment frequently undergo biofouling, which can result in both pollution and economic losses. Biofouling can be prevented using antifouling paints to inhibit the growth of adherent organisms. Since the ban of tributyltin, most antifouling agents are primarily copper -based mixtures, such as ZnPT and CuPT. To assess the environmental impacts of various antifouling agents, toxicity tests were conducted using the diatoms Skeletonema costatum and Navicula sp. For toxicity assessment, diatoms were exposed to CuSO<sub>4</sub>, ZnPT, and CuPT for 72 h, yielding EC<sub>50</sub> values for S. costatum of 1,524 μg/L, 1.06 μg/L, and 0.46 μg/L, respectively, and for Navicula sp. of 793.8 μg/L, 254.8 μg/L, and 75.93 μg/L, respectively. Both diatoms exhibited sensitivity in the order CuPT > ZnPT > CuSO<sub>4</sub>. Further tests of the combined effects of CuSO<sub>4</sub> and ZnPT revealed that mixing these biocides at their EC10 values produced greater toxicity than their individual effects. Although research concerning the synergistic effects of toxic mixtures is advancing, studies of epiphytic diatoms have been limited. Therefore, further research focused on toxicity and environmental effects among diatoms under various conditions is necessary.</p>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"207 ","pages":"107084"},"PeriodicalIF":3.0,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143670385","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

Modelling coral calcification rates in Orbicella faveolata (Cnidaria: Scleractinia) using light attenuation coefficients in water (KdPAR)

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2025-03-12 DOI: 10.1016/j.marenvres.2025.107074

Gabriela Gutiérrez-Estrada , J.J. Adolfo Tortolero-Langarica , Juan P. Carricart-Ganivet

Coral calcification represents a vital process within coral reef ecosystems, wherein reef-building corals contribute significantly to the physical construction and maintenance of the reef framework. The calcification process is related to the photosynthesis of endosymbiotic algae, where light plays a crucial role in coral energetic tradeoffs. However, local stressors have led to increased turbidity, subsequently affecting light availability, especially in nearshore reefs. This study proposes a light-driven model designed to predict coral calcification in Orbicella faveolata under different light conditions, using the diffuse attenuation coefficient in water (K_dPAR) as a predictive parameter. To determine annual calcification across different light conditions, we collected coral skeleton samples across depth gradients (∼5–38 m) at five reef sites in the Mexican Caribbean. Sclerochronological characteristics were analyzed through X-ray imaging and K_dPAR values were obtained using in-situ light measurements. The results indicate that as light PAR is attenuated with depth, coral skeletal density increases and extension rate decreases. Likewise, annual calcification also responds to the underwater light field. However, calcification shows a pattern that can be explained by a nonlinear Gaussian function and shows that 60 % of surface PAR is needed for optimal calcification. This function was used to predict annual calcification in different suboptimal K_dPAR conditions. This report presents the first model of annual calcification of O. faveolata using K_dPAR. The results provide significant ecological insights into coral calcification and underscore the importance of conserving optimal optical properties of the water column to sustain coral growth and provides a better understanding of coral distribution and their contribution to reef framework development across vertical gradients in the Caribbean region.

{"title":"Modelling coral calcification rates in Orbicella faveolata (Cnidaria: Scleractinia) using light attenuation coefficients in water (KdPAR)","authors":"Gabriela Gutiérrez-Estrada , J.J. Adolfo Tortolero-Langarica , Juan P. Carricart-Ganivet","doi":"10.1016/j.marenvres.2025.107074","DOIUrl":"10.1016/j.marenvres.2025.107074","url":null,"abstract":"<div><div>Coral calcification represents a vital process within coral reef ecosystems, wherein reef-building corals contribute significantly to the physical construction and maintenance of the reef framework. The calcification process is related to the photosynthesis of endosymbiotic algae, where light plays a crucial role in coral energetic tradeoffs. However, local stressors have led to increased turbidity, subsequently affecting light availability, especially in nearshore reefs. This study proposes a light-driven model designed to predict coral calcification in <em>Orbicella faveolata</em> under different light conditions, using the diffuse attenuation coefficient in water (K<sub>dPAR</sub>) as a predictive parameter. To determine annual calcification across different light conditions, we collected coral skeleton samples across depth gradients (∼5–38 m) at five reef sites in the Mexican Caribbean. Sclerochronological characteristics were analyzed through X-ray imaging and K<sub>dPAR</sub> values were obtained using in-situ light measurements. The results indicate that as light PAR is attenuated with depth, coral skeletal density increases and extension rate decreases. Likewise, annual calcification also responds to the underwater light field. However, calcification shows a pattern that can be explained by a nonlinear Gaussian function and shows that 60 % of surface PAR is needed for optimal calcification. This function was used to predict annual calcification in different suboptimal K<sub>dPAR</sub> conditions. This report presents the first model of annual calcification of <em>O. faveolata</em> using K<sub>dPAR</sub>. The results provide significant ecological insights into coral calcification and underscore the importance of conserving optimal optical properties of the water column to sustain coral growth and provides a better understanding of coral distribution and their contribution to reef framework development across vertical gradients in the Caribbean region.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"207 ","pages":"Article 107074"},"PeriodicalIF":3.0,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143636840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatial characteristics of microbial communities and their functions in sediments of subtropical Beibu Gulf, China

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2025-03-11 DOI: 10.1016/j.marenvres.2025.107077

Wenxue Che , Hui Zhao , Ying Man , Xiao Tan

Understanding the intricate relationship between marine geography and microbial functions is crucial for marine conservation and management. In this study, we conducted a comprehensive analysis of bacterial composition and function in nearshore and offshore sediments of the Beibu Gulf using 16S rRNA high-throughput sequencing. The results showed that Proteobacteria (average relative abundance: 27.07 %) and Desulfobacterota (average relative abundance: 12.28 %) were the most dominant phyla across all stations, while Woeseiaceae (3.26 %–8.31 %) and Anaerolineaceae (0.61 %–7.43 %) could serve as potential indicator species for pollution. In our study area, the α-diversity of bacterial communities in sediment samples showed an initial increase from coastal to offshore regions, followed by a decrease with further distance from the coastlines. The composition of sediment bacterial communities was mainly influenced by total phosphorus (R² = 0.183, p < 0.01) and salinity (R² = 0.550, p < 0.01). Furthermore, the sulfur (S) cycling genes of KEGG pathways displayed significant variations with the distance from shore, implying that S oxidation dominated in nearshore sediments, while S reduction occurred mainly in offshore sediments, which was attributed to the differences in redox conditions across diverse marine environments. These findings will not only enhance our current understanding of the intricate relationship between marine geography and microbial functions but also contribute to elucidating the biogeochemical characteristics of the Beibu Gulf. This research will provide valuable information and a solid scientific basis for the conservation and management of various marine areas.

了解海洋地理环境与微生物功能之间错综复杂的关系对于海洋保护和管理至关重要。在本研究中，我们利用 16S rRNA 高通量测序技术对北部湾近岸和离岸沉积物中的细菌组成和功能进行了全面分析。结果表明，蛋白细菌（平均相对丰度：27.07%）和脱硫细菌（平均相对丰度：12.28%）是所有站点的优势菌门，而禾本科（3.26%-8.31%）和厌氧菌科（0.61%-7.43%）可作为潜在的污染指示物种。在我们的研究区域，沉积物样本中细菌群落的 α-多样性显示出从沿海到近海区域的最初增加，随后随着距离海岸线的增加而减少。沉积物细菌群落的组成主要受总磷 (R2 = 0.183, p < 0.01) 和盐度 (R2 = 0.550, p < 0.01) 的影响。此外，KEGG通路的硫（S）循环基因随距离海岸的远近有显著变化，这意味着近岸沉积物中硫氧化占主导地位，而硫还原主要发生在离岸沉积物中，这归因于不同海洋环境中氧化还原条件的差异。这些发现不仅加深了我们对海洋地理环境与微生物功能之间错综复杂关系的理解，而且有助于阐明北部湾的生物地球化学特征。这项研究将为各种海洋区域的保护和管理提供宝贵的信息和坚实的科学依据。

{"title":"Spatial characteristics of microbial communities and their functions in sediments of subtropical Beibu Gulf, China","authors":"Wenxue Che , Hui Zhao , Ying Man , Xiao Tan","doi":"10.1016/j.marenvres.2025.107077","DOIUrl":"10.1016/j.marenvres.2025.107077","url":null,"abstract":"<div><div>Understanding the intricate relationship between marine geography and microbial functions is crucial for marine conservation and management. In this study, we conducted a comprehensive analysis of bacterial composition and function in nearshore and offshore sediments of the Beibu Gulf using 16S rRNA high-throughput sequencing. The results showed that <em>Proteobacteria</em> (average relative abundance: 27.07 %) and <em>Desulfobacterota</em> (average relative abundance: 12.28 %) were the most dominant phyla across all stations, while <em>Woeseiaceae</em> (3.26 %–8.31 %) and <em>Anaerolineaceae</em> (0.61 %–7.43 %) could serve as potential indicator species for pollution. In our study area, the <em>α</em>-diversity of bacterial communities in sediment samples showed an initial increase from coastal to offshore regions, followed by a decrease with further distance from the coastlines. The composition of sediment bacterial communities was mainly influenced by total phosphorus (R<sup>2</sup> = 0.183, <em>p</em> < 0.01) and salinity (R<sup>2</sup> = 0.550, <em>p</em> < 0.01). Furthermore, the sulfur (S) cycling genes of KEGG pathways displayed significant variations with the distance from shore, implying that S oxidation dominated in nearshore sediments, while S reduction occurred mainly in offshore sediments, which was attributed to the differences in redox conditions across diverse marine environments. These findings will not only enhance our current understanding of the intricate relationship between marine geography and microbial functions but also contribute to elucidating the biogeochemical characteristics of the Beibu Gulf. This research will provide valuable information and a solid scientific basis for the conservation and management of various marine areas.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"207 ","pages":"Article 107077"},"PeriodicalIF":3.0,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629438","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

Dissipation of Ulva prolifera green tides across various spatial and temporal scales and the short-term effects on marine environments 莼菜绿潮在不同时空尺度上的消散及其对海洋环境的短期影响

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2025-03-10 DOI: 10.1016/j.marenvres.2025.107082

Jiacheng Sun , Ke Liu , Haibo Zhang , Jie Fu , Xiaoyong Shi , Ziwei Yao , Gang Zhao , Zhenxia Sha , Hao Cui , Jinpeng Wu

The floating Ulva prolifera green tides have been observed annually in the South Yellow Sea (SYS) since 2007, and most researches indicate that Ulva prolifera typically appears near the Jiangsu Shoal in May, then floats and spreads northward, and eventually millions of tons of Ulva prolifera (4539600 t in 2021) accumulates and disappeared offshore of the Shandong Peninsula. The decomposition of Ulva prolifera in this region releases substantial amounts of nutrients and organic matter, which significantly affect the coastal ecosystem. To study the extinction of green tides on the environment, this study examines environmental parameters across three characteristic areas and analyzed the impact of Ulva prolifera death on the coastal seawater of Qingdao city from 2017 to 2022. The findings indicated that while green tides outbreaks do not significantly affect the annual nitrogen and phosphorus budgets of the entire SYS, while have notable impacts in regions where Ulva prolifera decays. The nutrients released during Ulva prolifera decay promote phytoplankton growth, increased the mean chlorophyll-a concentration from 1.45 μg/L to 2.85 μg/L during May to August in the Qingdao coastal area. Nutrient concentrations in the Qingdao coastal waters increased after the decay of Ulva prolifera and its’ associated phytoplankton. Dissolved inorganic nitrogen and phosphate concentration increased from 3.89 to 6.44 μmol/L and 0.17–0.20 μmol/L during August to October in the Qingdao coastal waters, respectively. This finding indicates that Ulva prolifera decay could cause short-term effects on the marine environment especially in nutrient pools.

{"title":"Dissipation of Ulva prolifera green tides across various spatial and temporal scales and the short-term effects on marine environments","authors":"Jiacheng Sun , Ke Liu , Haibo Zhang , Jie Fu , Xiaoyong Shi , Ziwei Yao , Gang Zhao , Zhenxia Sha , Hao Cui , Jinpeng Wu","doi":"10.1016/j.marenvres.2025.107082","DOIUrl":"10.1016/j.marenvres.2025.107082","url":null,"abstract":"<div><div>The floating <em>Ulva prolifera</em> green tides have been observed annually in the South Yellow Sea (SYS) since 2007, and most researches indicate that <em>Ulva prolifera</em> typically appears near the Jiangsu Shoal in May, then floats and spreads northward, and eventually millions of tons of <em>Ulva prolifera</em> (4539600 t in 2021) accumulates and disappeared offshore of the Shandong Peninsula. The decomposition of <em>Ulva prolifera</em> in this region releases substantial amounts of nutrients and organic matter, which significantly affect the coastal ecosystem. To study the extinction of green tides on the environment, this study examines environmental parameters across three characteristic areas and analyzed the impact of <em>Ulva prolifera</em> death on the coastal seawater of Qingdao city from 2017 to 2022. The findings indicated that while green tides outbreaks do not significantly affect the annual nitrogen and phosphorus budgets of the entire SYS, while have notable impacts in regions where <em>Ulva prolifera</em> decays. The nutrients released during <em>Ulva prolifera</em> decay promote phytoplankton growth, increased the mean chlorophyll-a concentration from 1.45 μg/L to 2.85 μg/L during May to August in the Qingdao coastal area. Nutrient concentrations in the Qingdao coastal waters increased after the decay of <em>Ulva prolifera</em> and its’ associated phytoplankton. Dissolved inorganic nitrogen and phosphate concentration increased from 3.89 to 6.44 μmol/L and 0.17–0.20 μmol/L during August to October in the Qingdao coastal waters, respectively. This finding indicates that <em>Ulva prolifera</em> decay could cause short-term effects on the marine environment especially in nutrient pools.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"207 ","pages":"Article 107082"},"PeriodicalIF":3.0,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629439","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

Environmental concentrations of fluoxetine antidepressant affect early development of sea urchin Paracentrotus lividus 环境中氟西汀抗抑郁剂的浓度对海胆Paracentrotus lividus早期发育的影响

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2025-03-10 DOI: 10.1016/j.marenvres.2025.107080

Roberta Miroglio, Roberta Nugnes, Lisa Zanetti, Marco Faimali, Chiara Gambardella

Fluoxetine (FLX), one of the most widely prescribed selective serotonin reuptake inhibitors, is frequently detected in the aquatic environment. In this study we assessed the ecotoxicological effects of FLX on the early life-stages of the sea urchin Paracentrotus lividus, a key species in the Mediterranean Sea. Fertilization rate, developmental anomalies and behavioural alterations were evaluated up to 72 h by exposing gametes, zygotes, and embryos (gastrula) to environmental (0.001, 0.01 mg/L) and high concentrations (0.1, 1, 10 mg/L). Further, the different types and frequency of morphological anomalies at larval level were classified to estimate the Index of Contaminant Impact (ICI) at relevant and high concentrations. The ICI was applied to predict which FLX concentrations may pose a risk to sea urchins. Although FLX did not affect fertilization, significant skeletal anomalies and behavioural alterations were found in plutei from each exposed stage. Based on EC50 values, the sensitivity level ranks as follows: zygote > gastrula > sperm. The ICI values indicated high and moderate impacts only at high concentrations. However, a slight impact was also found in plutei from zygote exposure at relevant environmental concentrations, highlighting a potential risk for sea urchin early development. Considering increasing FLX consumption, we suggest to include this PC in monitoring plans, to not exceed levels that may impair and severely affect the early developmental stages of echinoderms. In addition, our findings promote the use of ICI as a novel tool for FLX impact assessment.

{"title":"Environmental concentrations of fluoxetine antidepressant affect early development of sea urchin Paracentrotus lividus","authors":"Roberta Miroglio, Roberta Nugnes, Lisa Zanetti, Marco Faimali, Chiara Gambardella","doi":"10.1016/j.marenvres.2025.107080","DOIUrl":"10.1016/j.marenvres.2025.107080","url":null,"abstract":"<div><div>Fluoxetine (FLX), one of the most widely prescribed selective serotonin reuptake inhibitors, is frequently detected in the aquatic environment. In this study we assessed the ecotoxicological effects of FLX on the early life-stages of the sea urchin <em>Paracentrotus lividus,</em> a key species in the Mediterranean Sea. Fertilization rate, developmental anomalies and behavioural alterations were evaluated up to 72 h by exposing gametes, zygotes, and embryos (gastrula) to environmental (0.001, 0.01 mg/L) and high concentrations (0.1, 1, 10 mg/L). Further, the different types and frequency of morphological anomalies at larval level were classified to estimate the Index of Contaminant Impact (ICI) at relevant and high concentrations. The ICI was applied to predict which FLX concentrations may pose a risk to sea urchins. Although FLX did not affect fertilization, significant skeletal anomalies and behavioural alterations were found in plutei from each exposed stage. Based on EC50 values, the sensitivity level ranks as follows: zygote > gastrula > sperm. The ICI values indicated high and moderate impacts only at high concentrations. However, a slight impact was also found in plutei from zygote exposure at relevant environmental concentrations, highlighting a potential risk for sea urchin early development. Considering increasing FLX consumption, we suggest to include this PC in monitoring plans, to not exceed levels that may impair and severely affect the early developmental stages of echinoderms. In addition, our findings promote the use of ICI as a novel tool for FLX impact assessment.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"207 ","pages":"Article 107080"},"PeriodicalIF":3.0,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Between shells and seas: Effects of ocean acidification on calcification and osmoregulation in yellow clam (Amarilladesma mactroides)

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2025-03-10 DOI: 10.1016/j.marenvres.2025.107083

Isadora Porto Martins Medeiros , Fernanda Chaves Lopes , Marta Marques Souza

The decline in ocean pH due to rising CO₂ levels is a critical factor impacting marine ecosystems. Ocean acidification (OA) is expected to negatively affect various organisms, particularly those with mineralized structures. While the effects of OA on the calcification of shells and exoskeletons are documented, the impact on homeostatic processes, such as osmoregulation, is less understood. Osmoregulation is vital for maintaining water and salt balance within marine organisms, crucial for their survival and physiological functions. Acidification may alter ion exchange mechanisms, affecting the regulation of ions. In this study, we evaluated the effects of intermediate OA (pH 7.6) with or without hypersaline stress (35‰) on calcification and osmotic balance biomarkers in the bivalve Amarilladesma mactroides after 96h of acute exposure. We found that pH did not affect hemolymph osmolality or extracellular Ca²⁺ concentration. However, OA impaired the bivalve's ability to maintain its mineralized structures by decreasing Ca²⁺-ATPase enzyme activity in the mantle. The increase in carbonic anhydrase activity indicated a specific response to maintain acid-base balance in the tissue, i.e., compensating for the effects of acidification by neutralizing CO₂ accumulation and stabilizing internal pH. In the gills, both enzymes showed increased performance under higher salinity and reduced pH. Exposure to less alkaline pH inhibited carbonic anhydrase and Na⁺/K⁺-ATPase activity, potentially affecting the regulation of essential inorganic osmolytes.

{"title":"Between shells and seas: Effects of ocean acidification on calcification and osmoregulation in yellow clam (Amarilladesma mactroides)","authors":"Isadora Porto Martins Medeiros , Fernanda Chaves Lopes , Marta Marques Souza","doi":"10.1016/j.marenvres.2025.107083","DOIUrl":"10.1016/j.marenvres.2025.107083","url":null,"abstract":"<div><div>The decline in ocean pH due to rising CO<sub>2</sub> levels is a critical factor impacting marine ecosystems. Ocean acidification (OA) is expected to negatively affect various organisms, particularly those with mineralized structures. While the effects of OA on the calcification of shells and exoskeletons are documented, the impact on homeostatic processes, such as osmoregulation, is less understood. Osmoregulation is vital for maintaining water and salt balance within marine organisms, crucial for their survival and physiological functions. Acidification may alter ion exchange mechanisms, affecting the regulation of ions. In this study, we evaluated the effects of intermediate OA (pH 7.6) with or without hypersaline stress (35‰) on calcification and osmotic balance biomarkers in the bivalve <em>Amarilladesma mactroides</em> after 96h of acute exposure. We found that pH did not affect hemolymph osmolality or extracellular Ca<sup>2+</sup> concentration. However, OA impaired the bivalve's ability to maintain its mineralized structures by decreasing Ca<sup>2+</sup>-ATPase enzyme activity in the mantle. The increase in carbonic anhydrase activity indicated a specific response to maintain acid-base balance in the tissue, i.e., compensating for the effects of acidification by neutralizing CO<sub>2</sub> accumulation and stabilizing internal pH. In the gills, both enzymes showed increased performance under higher salinity and reduced pH. Exposure to less alkaline pH inhibited carbonic anhydrase and Na<sup>+</sup>/K<sup>+</sup>-ATPase activity, potentially affecting the regulation of essential inorganic osmolytes.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"207 ","pages":"Article 107083"},"PeriodicalIF":3.0,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610836","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

CO2 dynamics and sequestration potential in high-nutrient, low-chlorophyll bays: A case study of Yueqing Bay

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2025-03-08 DOI: 10.1016/j.marenvres.2025.107061

Yixing Zhang , Bin Wang , Qian Li , Dewang Li , Chen Zeng , Mingyao Xing , Xuan Zhang , Zhao Zhang , Jinkun Qiu , Yahui Chen , Hongliang Li , Zhenhao Sun , Yanbing Xu , Jianfang Chen

Bays, as transitional zones in the land-sea continuum, exhibit fluctuating sea-air CO₂ fluxes influenced by climate change and human activities. The role of eutrophic bays as CO₂ sinks is debated, highlighting the need to understand CO₂ dynamics and controlling factors. This research employs the subtropical semi-enclosed Yueqing Bay as a case to investigate the dynamics of pCO₂ and sea-air CO₂ flux, as well as the carbon sink potential in high-nutrient, low-chlorophyll (HNLC) bays through high-resolution underway surveys. Although eutrophic bays worldwide typically function as atmospheric CO₂ sinks on an annual scale, the high concentration of suspended particulate matter (SPM) from the Oujiang River, combined with sediment resuspension and other processes, inhibits primary production, thereby reducing CO₂ sequestration. As a result, Yueqing Bay acts as a net atmospheric CO₂ source in August and November, with fluxes of 6.22 ± 8.79 mmol m⁻² d⁻¹ and 0.53 ± 0.19 mmol m⁻² d⁻¹, respectively, and an average flux of 1.23 ± 1.04 mol m⁻² yr⁻¹. However, acting as nutrient reservoirs, the underutilized nutrients in Yueqing Bay partially contribute to algal blooms, which in turn enhance CO₂ absorption at the Bay Mouth through seawater exchange. Therefore, HNLC bays like Yueqing Bay demonstrate spatial redistribution of CO₂ sink function due to hydrodynamic and biogeochemical processes, offering new insights into the role of bay ecosystems in the carbon cycle.

{"title":"CO2 dynamics and sequestration potential in high-nutrient, low-chlorophyll bays: A case study of Yueqing Bay","authors":"Yixing Zhang , Bin Wang , Qian Li , Dewang Li , Chen Zeng , Mingyao Xing , Xuan Zhang , Zhao Zhang , Jinkun Qiu , Yahui Chen , Hongliang Li , Zhenhao Sun , Yanbing Xu , Jianfang Chen","doi":"10.1016/j.marenvres.2025.107061","DOIUrl":"10.1016/j.marenvres.2025.107061","url":null,"abstract":"<div><div>Bays, as transitional zones in the land-sea continuum, exhibit fluctuating sea-air CO<sub>2</sub> fluxes influenced by climate change and human activities. The role of eutrophic bays as CO<sub>2</sub> sinks is debated, highlighting the need to understand CO<sub>2</sub> dynamics and controlling factors. This research employs the subtropical semi-enclosed Yueqing Bay as a case to investigate the dynamics of <em>p</em>CO<sub>2</sub> and sea-air CO<sub>2</sub> flux, as well as the carbon sink potential in high-nutrient, low-chlorophyll (HNLC) bays through high-resolution underway surveys. Although eutrophic bays worldwide typically function as atmospheric CO<sub>2</sub> sinks on an annual scale, the high concentration of suspended particulate matter (SPM) from the Oujiang River, combined with sediment resuspension and other processes, inhibits primary production, thereby reducing CO<sub>2</sub> sequestration. As a result, Yueqing Bay acts as a net atmospheric CO<sub>2</sub> source in August and November, with fluxes of 6.22 ± 8.79 mmol m<sup>−2</sup> d<sup>−1</sup> and 0.53 ± 0.19 mmol m<sup>−2</sup> d<sup>−1</sup>, respectively, and an average flux of 1.23 ± 1.04 mol m<sup>−2</sup> yr<sup>−1</sup>. However, acting as nutrient reservoirs, the underutilized nutrients in Yueqing Bay partially contribute to algal blooms, which in turn enhance CO<sub>2</sub> absorption at the Bay Mouth through seawater exchange. Therefore, HNLC bays like Yueqing Bay demonstrate spatial redistribution of CO<sub>2</sub> sink function due to hydrodynamic and biogeochemical processes, offering new insights into the role of bay ecosystems in the carbon cycle.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"207 ","pages":"Article 107061"},"PeriodicalIF":3.0,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610834","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

Lasting impacts of rapid salinity change on physiological energetics of estuarine oysters (Crassostrea hongkongensis)

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2025-03-08 DOI: 10.1016/j.marenvres.2025.107076

Tuo Yao , Fortunatus Masanja , Jie Lu , Shengli Fu , Wenfan Luo , Vicent Michael Shija , Lingtong Ye , Liqiang Zhao

The duration of rapid salinity change (RSC) prevailing in estuarine and coastal regions is increasing due to extreme climate and weather events, posing significant challenges to marine bivalves. The Hong Kong oyster (Crassostrea hongkongensis), an ecologically and economically important species in tropical estuarine ecosystems, has experienced increasing mass mortality during prolonged periods of RSC, yet little is known about underlying physiological processes. Here, we investigated how physiological energetics of C. hongkongensis were affected by longer-lasting scenarios and four-week episodes of RSC. Compared with ambient conditions with seawater salinity ranging from 15 to 20, rapid salinity change by ± 10 units significantly decreased the survival of oysters, with RSC-induced hyposaline stress (−10) resulting in more serious consequences than that of hypersaline regime (+10). Continuing exposure of oysters to both RSC scenarios significantly affected their feeding activities, but the food absorption efficiency were still virtually unchanged. Significantly depressed respiration and increased excretion activities were observed in RSC-stressed oysters, resulting in significantly lowered O:N ratio. Overall, when exposed to RSC, oysters showed significantly decreased scope for growth, due to shifts in energy budget toward maintenance of essential physiological processes. Our results demonstrate the vulnerability of estuarine oysters to prolonged RSC events, and underscore the pressing need to develop strategies to enhance oyster tolerance under intensifying RSC conditions and safeguard oyster aquaculture in this era of unprecedented climate change.

{"title":"Lasting impacts of rapid salinity change on physiological energetics of estuarine oysters (Crassostrea hongkongensis)","authors":"Tuo Yao , Fortunatus Masanja , Jie Lu , Shengli Fu , Wenfan Luo , Vicent Michael Shija , Lingtong Ye , Liqiang Zhao","doi":"10.1016/j.marenvres.2025.107076","DOIUrl":"10.1016/j.marenvres.2025.107076","url":null,"abstract":"<div><div>The duration of rapid salinity change (RSC) prevailing in estuarine and coastal regions is increasing due to extreme climate and weather events, posing significant challenges to marine bivalves. The Hong Kong oyster <em>(Crassostrea hongkongensis)</em>, an ecologically and economically important species in tropical estuarine ecosystems, has experienced increasing mass mortality during prolonged periods of RSC, yet little is known about underlying physiological processes. Here, we investigated how physiological energetics of <em>C. hongkongensis</em> were affected by longer-lasting scenarios and four-week episodes of RSC. Compared with ambient conditions with seawater salinity ranging from 15 to 20, rapid salinity change by ± 10 units significantly decreased the survival of oysters, with RSC-induced hyposaline stress (−10) resulting in more serious consequences than that of hypersaline regime (+10). Continuing exposure of oysters to both RSC scenarios significantly affected their feeding activities, but the food absorption efficiency were still virtually unchanged. Significantly depressed respiration and increased excretion activities were observed in RSC-stressed oysters, resulting in significantly lowered O:N ratio. Overall, when exposed to RSC, oysters showed significantly decreased scope for growth, due to shifts in energy budget toward maintenance of essential physiological processes. Our results demonstrate the vulnerability of estuarine oysters to prolonged RSC events, and underscore the pressing need to develop strategies to enhance oyster tolerance under intensifying RSC conditions and safeguard oyster aquaculture in this era of unprecedented climate change.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"207 ","pages":"Article 107076"},"PeriodicalIF":3.0,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619950","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