Marine environmental research最新文献

Nitrogen utilization dynamics in a tropical estuary: Interplay of temperature and phytoplankton communities

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

Marine environmental research

Pub Date : 2025-02-15 DOI: 10.1016/j.marenvres.2025.107018

Penglan Shi , Zuoli Tan , Youfei Fu , Min Nina Xu , Rong Zhao , Lihua Shang , Jin-Ming Tang , Lili Han , Shan Sun , Ehui Tan , Zhenzhen Zheng , Shuh-Ji Kao

Nitrogenous nutrients—such as nitrate (NO₃⁻), nitrite (NO₂⁻), ammonium (NH₄⁺), and urea—are key drivers of phytoplankton productivity and biogeochemical cycles in marine ecosystems, often entering coastal zones through estuarine discharge. Estuaries, particularly tropical ones, play a vital role in regulating the composition and export of nitrogen (N) species to downstream coastal waters. Despite their ecological significance, the factors influencing N utilization in tropical estuaries remain poorly understood. In this study, we used ¹⁵N isotope tracer incubation techniques to explore the seasonal variations in the uptake rates of NO₃⁻, NO₂⁻, NH₄⁺, and urea in the Dongzhai Harbor estuary, a tropical system in China. We found that while NO₃⁻ was the most abundant reactive N species in both seasons, NH₄⁺ was preferentially taken up by phytoplankton during the warm season. Conversely, urea uptake increased unexpectedly during the cold season, likely due to shifts in phytoplankton community composition favoring urea-preferred taxa like Peridiniopsis. Seasonal variations in N uptake rates were primarily governed by temperature and phytoplankton community structure. Enhanced inorganic N uptake during the warm season reduced the export of reactive inorganic N, whereas higher organic N uptake in the cold season facilitated the inorganic N exported to coastal waters. These findings highlight the interplay between environmental drivers and community dynamics in shaping nitrogen cycling in tropical estuaries. They underscore the importance of managing nutrient inputs to potentially safeguard sensitive downstream ecosystems, such as coral reefs, from eutrophication and degradation.

{"title":"Nitrogen utilization dynamics in a tropical estuary: Interplay of temperature and phytoplankton communities","authors":"Penglan Shi , Zuoli Tan , Youfei Fu , Min Nina Xu , Rong Zhao , Lihua Shang , Jin-Ming Tang , Lili Han , Shan Sun , Ehui Tan , Zhenzhen Zheng , Shuh-Ji Kao","doi":"10.1016/j.marenvres.2025.107018","DOIUrl":"10.1016/j.marenvres.2025.107018","url":null,"abstract":"<div><div>Nitrogenous nutrients—such as nitrate (NO<sub>3</sub><sup>−</sup>), nitrite (NO<sub>2</sub><sup>−</sup>), ammonium (NH<sub>4</sub><sup>+</sup>), and urea—are key drivers of phytoplankton productivity and biogeochemical cycles in marine ecosystems, often entering coastal zones through estuarine discharge. Estuaries, particularly tropical ones, play a vital role in regulating the composition and export of nitrogen (N) species to downstream coastal waters. Despite their ecological significance, the factors influencing N utilization in tropical estuaries remain poorly understood. In this study, we used <sup>15</sup>N isotope tracer incubation techniques to explore the seasonal variations in the uptake rates of NO<sub>3</sub><sup>−</sup>, NO<sub>2</sub><sup>−</sup>, NH<sub>4</sub><sup>+</sup>, and urea in the Dongzhai Harbor estuary, a tropical system in China. We found that while NO<sub>3</sub><sup>−</sup> was the most abundant reactive N species in both seasons, NH<sub>4</sub><sup>+</sup> was preferentially taken up by phytoplankton during the warm season. Conversely, urea uptake increased unexpectedly during the cold season, likely due to shifts in phytoplankton community composition favoring urea-preferred taxa like <em>Peridiniopsis</em>. Seasonal variations in N uptake rates were primarily governed by temperature and phytoplankton community structure. Enhanced inorganic N uptake during the warm season reduced the export of reactive inorganic N, whereas higher organic N uptake in the cold season facilitated the inorganic N exported to coastal waters. These findings highlight the interplay between environmental drivers and community dynamics in shaping nitrogen cycling in tropical estuaries. They underscore the importance of managing nutrient inputs to potentially safeguard sensitive downstream ecosystems, such as coral reefs, from eutrophication and degradation.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"205 ","pages":"Article 107018"},"PeriodicalIF":3.0,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430332","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

Evaluation of heavy metal pollution and ecological risk of surface sediments in a tropical mountainous River-Estuary-Shelf Continuum system: A case study of the Selangor River, Malaysia

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

Marine environmental research

Pub Date : 2025-02-13 DOI: 10.1016/j.marenvres.2025.107017

Aijun Wang , Chui Wei Bong , Shuqin Tao , Xiang Ye , Boyu Liu , Haoshen Liang , Xinqing Zheng , Yi You Wong , Kar Hoe Loh , Haiqi Li , Keliang Chen , Siew Huah Lim , Choon Weng Lee

As human activities continue to increase, the global production of pollutants has increased significantly, with the majority of pollutants being transported to the ocean via rivers, resulting in intensified pollution in estuaries and coastal areas. To maintain a healthy marine ecological environment, it is necessary to consider rivers, estuaries, and coastal seas as integrated systems and implement pollution management based on the concept of land–ocean integration. In this study, heavy metal elements in the surface sediments of Selangor River-Estuary-Coastal Shelf Continuum were collected and analysed to assess their pollution levels and potential ecological risks. The results show that the heavy metal content is high in the downstream and estuarine regions, with a general decreasing trend observed from nearshore to offshore in the coastal shelf area. The heavy metal pollution assessment indicates that the surface sediments of the Selangor River-Estuary-Coastal Shelf continuum were contaminated, with the most severe pollution occurring downstream and within the estuary. The pollution levels gradually decrease after exiting the estuary. The ecological risk associated with heavy metal pollution in rivers, estuaries, and southeastern coastal areas was classified as moderate to serious, whereas other areas exhibited only slight ecological risks. Specifically, As causes serious pollution in the river and estuary, with moderate-to-serious pollution in the coastal shelf area and moderate-to-serious ecological risks, mainly originating from mining within the river basin. Pb causes moderate pollution in the river, estuary, and coastal areas, with slight ecological risks due to mining within the river basin and inputs from nearby rivers, ports, and industrial activities. Other heavy metals cause minor pollution and pose minimal ecological risks.

{"title":"Evaluation of heavy metal pollution and ecological risk of surface sediments in a tropical mountainous River-Estuary-Shelf Continuum system: A case study of the Selangor River, Malaysia","authors":"Aijun Wang , Chui Wei Bong , Shuqin Tao , Xiang Ye , Boyu Liu , Haoshen Liang , Xinqing Zheng , Yi You Wong , Kar Hoe Loh , Haiqi Li , Keliang Chen , Siew Huah Lim , Choon Weng Lee","doi":"10.1016/j.marenvres.2025.107017","DOIUrl":"10.1016/j.marenvres.2025.107017","url":null,"abstract":"<div><div>As human activities continue to increase, the global production of pollutants has increased significantly, with the majority of pollutants being transported to the ocean via rivers, resulting in intensified pollution in estuaries and coastal areas. To maintain a healthy marine ecological environment, it is necessary to consider rivers, estuaries, and coastal seas as integrated systems and implement pollution management based on the concept of land–ocean integration. In this study, heavy metal elements in the surface sediments of Selangor River-Estuary-Coastal Shelf Continuum were collected and analysed to assess their pollution levels and potential ecological risks. The results show that the heavy metal content is high in the downstream and estuarine regions, with a general decreasing trend observed from nearshore to offshore in the coastal shelf area. The heavy metal pollution assessment indicates that the surface sediments of the Selangor River-Estuary-Coastal Shelf continuum were contaminated, with the most severe pollution occurring downstream and within the estuary. The pollution levels gradually decrease after exiting the estuary. The ecological risk associated with heavy metal pollution in rivers, estuaries, and southeastern coastal areas was classified as moderate to serious, whereas other areas exhibited only slight ecological risks. Specifically, As causes serious pollution in the river and estuary, with moderate-to-serious pollution in the coastal shelf area and moderate-to-serious ecological risks, mainly originating from mining within the river basin. Pb causes moderate pollution in the river, estuary, and coastal areas, with slight ecological risks due to mining within the river basin and inputs from nearby rivers, ports, and industrial activities. Other heavy metals cause minor pollution and pose minimal ecological risks.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"205 ","pages":"Article 107017"},"PeriodicalIF":3.0,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421824","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

Framework for predicting the spatial distribution of green algae blooms utilizing historical GOCI and MODIS imagery

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

Marine environmental research

Pub Date : 2025-02-13 DOI: 10.1016/j.marenvres.2025.107016

Zhongyuan Wang , Zhixiang Fang , Rui Feng

Green algal blooms (GABs) have become a global concern and are particularly serious in the southern Yellow Sea (SYS). Remote sensing (RS) images are the most popular and effective data source for detecting GABs; however, in case of unfavorable weather conditions (e.g., cloud cover), extracting GABs from RS images is impossible. To compensate for the shortage of RS images for GAB detection, this study proposes an effective GAB prediction framework based on cellular automata (CA-GPM) that utilizes historical Geostationary Ocean Color Imager (GOCI) and Moderate Resolution Imaging Spectroradiometer (MODIS) imagery. CA-GPM first extracts the GAB coverage and chlorophyll-a (Chl-a) concentration from the last available RS images and establishes a competitive association between GAB events and Chl-a concentration. This study used structural equation model analysis to evaluate the impact weights of all marine environment data (MED) on GAB growth and drift. Eventually, the cellular automata method was used to predict GABs based on the competition pattern, drift pattern, and growth-and-decline rules. Through the comparison of the CA-GPM results with GABs identified in RS images from 2011 to 2022, the precision, missing alarm rate, and false alarm rate were found to be 0.6909 ± 0.5001, 0.2980 ± 0.6975, and 0.3091 ± 0.5001 respectively. The designed CA-GPM can be effectively applied for emergency management of GABs. In addition, based on CA-GPM, this study revealed the competition, physical, and biological factors affecting GABs in the SYS, with the biological and physical conditions being equally important during 2011–2020. Since 2021, the physical conditions have had a negative effect on GABs. In summary, the proposed method can facilitate the detection of GABs when RS images cannot be used.

{"title":"Framework for predicting the spatial distribution of green algae blooms utilizing historical GOCI and MODIS imagery","authors":"Zhongyuan Wang , Zhixiang Fang , Rui Feng","doi":"10.1016/j.marenvres.2025.107016","DOIUrl":"10.1016/j.marenvres.2025.107016","url":null,"abstract":"<div><div>Green algal blooms (GABs) have become a global concern and are particularly serious in the southern Yellow Sea (SYS). Remote sensing (RS) images are the most popular and effective data source for detecting GABs; however, in case of unfavorable weather conditions (e.g., cloud cover), extracting GABs from RS images is impossible. To compensate for the shortage of RS images for GAB detection, this study proposes an effective GAB prediction framework based on cellular automata (CA-GPM) that utilizes historical Geostationary Ocean Color Imager (GOCI) and Moderate Resolution Imaging Spectroradiometer (MODIS) imagery. CA-GPM first extracts the GAB coverage and chlorophyll-a (Chl-a) concentration from the last available RS images and establishes a competitive association between GAB events and Chl-a concentration. This study used structural equation model analysis to evaluate the impact weights of all marine environment data (MED) on GAB growth and drift. Eventually, the cellular automata method was used to predict GABs based on the competition pattern, drift pattern, and growth-and-decline rules. Through the comparison of the CA-GPM results with GABs identified in RS images from 2011 to 2022, the precision, missing alarm rate, and false alarm rate were found to be 0.6909 ± 0.5001, 0.2980 ± 0.6975, and 0.3091 ± 0.5001 respectively. The designed CA-GPM can be effectively applied for emergency management of GABs. In addition, based on CA-GPM, this study revealed the competition, physical, and biological factors affecting GABs in the SYS, with the biological and physical conditions being equally important during 2011–2020. Since 2021, the physical conditions have had a negative effect on GABs. In summary, the proposed method can facilitate the detection of GABs when RS images cannot be used.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"205 ","pages":"Article 107016"},"PeriodicalIF":3.0,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445038","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

Seasonal effects of extreme climate events and sea surface temperature indicators on the vulnerability of marine pelagic fisheries in the Bay of Bengal region

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

Marine environmental research

Pub Date : 2025-02-13 DOI: 10.1016/j.marenvres.2025.107009

Monika Makwana, Unmesh Patnaik

The study highlights the vulnerability of the eastern coast to tropical cyclones and the unique characteristics of the Bay of Bengal region. Seasonality, driven by global climatic events and geography, significantly affects the marine ecosystem. Furthermore, it underscores the effects of extreme climate events on marine pelagic fisheries and advocates for a state-based approach to raise awareness among government institutions and fishing communities. Findings reveal a significant negative relationship between Sea Surface Temperature (SST) and fish-catch (coefficient = −0.09, p < 0.01), indicating that rising SST adversely affects pelagic fish populations. Moreover, increased frequency of extreme events (−0.12 to −2.06, p < 0.05 to p < 0.01) and disturbances (−0.149 to −0.679, p < 0.05) exhibits detrimental impacts across various models. Notably, seasonal variations play a crucial role, with quarters 1, 3, and 4 demonstrating positive associations (0.186–0.604, p < 0.1 to p < 0.05) with fish-catch, signifying potentially favourable conditions during specific seasons. State-specific analysis highlights diverse impacts, wherein West Bengal experiences substantial negative effects from extreme events (−2.056, p < 0.01), emphasizing regional disparities. These findings underscore the need for regionalized mitigation strategies and sustainable fishing practices to ensure the future of the Bay of Bengal's marine ecosystem.

{"title":"Seasonal effects of extreme climate events and sea surface temperature indicators on the vulnerability of marine pelagic fisheries in the Bay of Bengal region","authors":"Monika Makwana, Unmesh Patnaik","doi":"10.1016/j.marenvres.2025.107009","DOIUrl":"10.1016/j.marenvres.2025.107009","url":null,"abstract":"<div><div>The study highlights the vulnerability of the eastern coast to tropical cyclones and the unique characteristics of the Bay of Bengal region. Seasonality, driven by global climatic events and geography, significantly affects the marine ecosystem. Furthermore, it underscores the effects of extreme climate events on marine pelagic fisheries and advocates for a state-based approach to raise awareness among government institutions and fishing communities. Findings reveal a significant negative relationship between Sea Surface Temperature (SST) and fish-catch (coefficient = −0.09, p < 0.01), indicating that rising SST adversely affects pelagic fish populations. Moreover, increased frequency of extreme events (−0.12 to −2.06, p < 0.05 to p < 0.01) and disturbances (−0.149 to −0.679, p < 0.05) exhibits detrimental impacts across various models. Notably, seasonal variations play a crucial role, with quarters 1, 3, and 4 demonstrating positive associations (0.186–0.604, p < 0.1 to p < 0.05) with fish-catch, signifying potentially favourable conditions during specific seasons. State-specific analysis highlights diverse impacts, wherein West Bengal experiences substantial negative effects from extreme events (−2.056, p < 0.01), emphasizing regional disparities. These findings underscore the need for regionalized mitigation strategies and sustainable fishing practices to ensure the future of the Bay of Bengal's marine ecosystem.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"205 ","pages":"Article 107009"},"PeriodicalIF":3.0,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438031","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

Spatial patterns in reef fish biomass and trait structure along a natural environmental gradient

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

Marine environmental research

Pub Date : 2025-02-13 DOI: 10.1016/j.marenvres.2025.107014

Darren J. Coker , Lucia Pombo-Ayora , Alexander Kattan , Laura Gajdzik , Diego Lozano-Cortés , Susana Carvalho , Michael L. Berumen

Biodiversity loss is a fundamental concern across marine and terrestrial ecosystems in virtue of continued and increasing localized and global human activities. Accordingly, it is essential to discern how communities vary in space across a range of environmental and disturbance scales. Increasingly, ecological traits are providing important mechanisms for understanding communities based on the trait's species provide, building upon traditional assessments of taxonomic identity. This study investigated trait and biomass indices constructed from fish communities from 94 reefs along 2000 kms of latitude along the Red Sea. Fish communities were recorded through in situ visual surveys and covered varying coastal population density and a natural linear gradient in environmental parameters (sea surface temperature, productivity, salinity). From these communities, a total of 153 unique functional entities (FEs) were recorded. Using key components of trait diversity, Red Sea reefs contain low trait redundancy and high vulnerability, with 71% of FEs represented by a single species. Despite the strong linear gradient in environmental variables along the latitudinal range, functional richness and diversity did not reflect this, suggesting that local scale environmental variability and stressors may have a greater, and or additive influence. Standing biomass and biomass productivity was highest in the Farasan Banks (southern Red Sea) while biomass productivity was lowest in the two far northern regions. The high biomass in the Farasan Banks was largely driven by planktivore species, suggesting a link with higher levels of primary productivity and warmer water temperature in the south. The region with the highest trait vulnerability was adjacent to a major city and industrial port, suggesting a link between vulnerability and coastal population. This study provides a baseline for the region and a mechanism to support recommendations on the assessment of vulnerable reef fish communities at regional scales beyond taxonomic assessments.

{"title":"Spatial patterns in reef fish biomass and trait structure along a natural environmental gradient","authors":"Darren J. Coker , Lucia Pombo-Ayora , Alexander Kattan , Laura Gajdzik , Diego Lozano-Cortés , Susana Carvalho , Michael L. Berumen","doi":"10.1016/j.marenvres.2025.107014","DOIUrl":"10.1016/j.marenvres.2025.107014","url":null,"abstract":"<div><div>Biodiversity loss is a fundamental concern across marine and terrestrial ecosystems in virtue of continued and increasing localized and global human activities. Accordingly, it is essential to discern how communities vary in space across a range of environmental and disturbance scales. Increasingly, ecological traits are providing important mechanisms for understanding communities based on the trait's species provide, building upon traditional assessments of taxonomic identity. This study investigated trait and biomass indices constructed from fish communities from 94 reefs along 2000 kms of latitude along the Red Sea. Fish communities were recorded through <em>in situ</em> visual surveys and covered varying coastal population density and a natural linear gradient in environmental parameters (sea surface temperature, productivity, salinity). From these communities, a total of 153 unique functional entities (<em>FEs</em>) were recorded. Using key components of trait diversity, Red Sea reefs contain low trait redundancy and high vulnerability, with 71% of <em>FEs</em> represented by a single species. Despite the strong linear gradient in environmental variables along the latitudinal range, functional richness and diversity did not reflect this, suggesting that local scale environmental variability and stressors may have a greater, and or additive influence. Standing biomass and biomass productivity was highest in the Farasan Banks (southern Red Sea) while biomass productivity was lowest in the two far northern regions. The high biomass in the Farasan Banks was largely driven by planktivore species, suggesting a link with higher levels of primary productivity and warmer water temperature in the south. The region with the highest trait vulnerability was adjacent to a major city and industrial port, suggesting a link between vulnerability and coastal population. This study provides a baseline for the region and a mechanism to support recommendations on the assessment of vulnerable reef fish communities at regional scales beyond taxonomic assessments.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"205 ","pages":"Article 107014"},"PeriodicalIF":3.0,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430331","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

Sex-specific reproductive impairment in Pacific oysters (Magallana gigas) exposed to TiO2 NPs: A focus on gonadal status

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

Marine environmental research

Pub Date : 2025-02-12 DOI: 10.1016/j.marenvres.2025.107008

F Fernández-García , A Marques , S Jerónimo , I. B Oliveira , A Carvalhais , V Pereira , J.F Asturiano , M Pacheco , C Mieiro

Environmentally realistic concentrations of titanium dioxide nanoparticles (TiO₂ NPs) are considered reprotoxic for marine bivalves. However, further investigation is needed to understand their impact on gonadal health, particularly concerning sex-specific responses. Thus, this study aimed to understand sex-based effects of TiO₂ NPs environmentally realistic concentrations in the gonad of Pacific oysters (Magallana gigas). Oysters were exposed to 10 and 100 μg·L⁻¹ of TiO₂ NPs for 3 and 7 days. Morphological parameters (condition index, sex and gametogenic stage), energy-related responses (carbohydrates, lipids, proteins, and electron transport system (ETS) activity), digestive function (alpha-amylase activity), and oxidative stress profile (antioxidants and damage) were assessed to address gonadal status. The results revealed sex-specific responses based on duration and concentration. Females reflected a drop in carbohydrate levels after 3 days at 100 μg·L⁻¹, suggesting mobilization of this energy reserve to counteract TiO₂ NP effects, followed by recovery after 7 days. Males showed reduced metabolic activity after 3 days at 10 μg·L⁻¹, marked by ETS depletion, independently of oxidative stress demonstrating a compensatory response to TiO₂ NP exposure. After 7 days, both concentrations triggered male lipid peroxidation despite carbohydrate mobilization at 10 μg·L⁻¹, indicating oxidative damage in testes. These findings revealed that TiO₂ NPs are reprotoxic for male oysters at 10 μg·L⁻¹, through oxidative stress pathways, while females reflected vulnerability to 100 μg·L⁻¹. This study provides valuable insights into understanding TiO₂ NP's reprotoxicity at environmental concentrations, highlighting gonads as a target for these NPs, and their potential risks to marine bivalves.

{"title":"Sex-specific reproductive impairment in Pacific oysters (Magallana gigas) exposed to TiO2 NPs: A focus on gonadal status","authors":"F Fernández-García , A Marques , S Jerónimo , I. B Oliveira , A Carvalhais , V Pereira , J.F Asturiano , M Pacheco , C Mieiro","doi":"10.1016/j.marenvres.2025.107008","DOIUrl":"10.1016/j.marenvres.2025.107008","url":null,"abstract":"<div><div>Environmentally realistic concentrations of titanium dioxide nanoparticles (TiO<sub>2</sub> NPs) are considered reprotoxic for marine bivalves. However, further investigation is needed to understand their impact on gonadal health, particularly concerning sex-specific responses. Thus, this study aimed to understand sex-based effects of TiO<sub>2</sub> NPs environmentally realistic concentrations in the gonad of Pacific oysters (<em>Magallana gigas</em>). Oysters were exposed to 10 and 100 μg·L<sup>−1</sup> of TiO<sub>2</sub> NPs for 3 and 7 days. Morphological parameters (condition index, sex and gametogenic stage), energy-related responses (carbohydrates, lipids, proteins, and electron transport system (ETS) activity), digestive function (alpha-amylase activity), and oxidative stress profile (antioxidants and damage) were assessed to address gonadal status. The results revealed sex-specific responses based on duration and concentration. Females reflected a drop in carbohydrate levels after 3 days at 100 μg·L<sup>−1</sup>, suggesting mobilization of this energy reserve to counteract TiO<sub>2</sub> NP effects, followed by recovery after 7 days. Males showed reduced metabolic activity after 3 days at 10 μg·L<sup>−1</sup>, marked by ETS depletion, independently of oxidative stress demonstrating a compensatory response to TiO<sub>2</sub> NP exposure. After 7 days, both concentrations triggered male lipid peroxidation despite carbohydrate mobilization at 10 μg·L<sup>−1</sup>, indicating oxidative damage in testes. These findings revealed that TiO<sub>2</sub> NPs are reprotoxic for male oysters at 10 μg·L<sup>−1</sup>, through oxidative stress pathways, while females reflected vulnerability to 100 μg·L<sup>−1</sup>. This study provides valuable insights into understanding TiO<sub>2</sub> NP's reprotoxicity at environmental concentrations, highlighting gonads as a target for these NPs, and their potential risks to marine bivalves.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"205 ","pages":"Article 107008"},"PeriodicalIF":3.0,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445039","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

Role of benthic fauna in the decomposition of Sargassum fusiforme litter

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

Marine environmental research

Pub Date : 2025-02-11 DOI: 10.1016/j.marenvres.2025.107010

Zhangbin Liu , Jian Zhang , Jianqu Chen , Kai Wang , Shouyu Zhang

To explore the contribution of benthic fauna to mass loss during the decomposition of Sargassum fusiforme litter and their role in influencing chemical composition changes, a 48-day field decomposition experiment was conducted on S. fusiforme litter collected from Gouqi Island, East China Sea. Three types of mesh bags with different mesh size (2, 0.5, and 0.01 mm) were used to analyze the mass loss and chemical composition changes of the litter and their relationship with benthic fauna communities. The results indicated that benthic fauna contributed 14.83%–16.69% of the mass loss of S. fusiforme litter. Furthermore, benthic fauna facilitated the reduction of biochemical substances such as carbon, phosphorus, cellulose, and hemicellulose in the litter. A significant negative correlation was found between the number of taxonomic classes and the carbon and phosphorus content (p < 0.05), while the abundance of benthic fauna showed a significant negative correlation with carbon, phosphorus, lignin, cellulose, and hemicellulose content (p < 0.05). The number of taxonomic classes and abundance in the 2 mm mesh bags were also greater than those in the 0.5 mm bags. In conclusion, benthic fauna played a promotive role in the decomposition process of S. fusiforme litter, providing valuable insights into the natural decomposition mechanisms of large seaweed.

{"title":"Role of benthic fauna in the decomposition of Sargassum fusiforme litter","authors":"Zhangbin Liu , Jian Zhang , Jianqu Chen , Kai Wang , Shouyu Zhang","doi":"10.1016/j.marenvres.2025.107010","DOIUrl":"10.1016/j.marenvres.2025.107010","url":null,"abstract":"<div><div>To explore the contribution of benthic fauna to mass loss during the decomposition of <em>Sargassum fusiforme</em> litter and their role in influencing chemical composition changes, a 48-day field decomposition experiment was conducted on <em>S</em>. <em>fusiforme</em> litter collected from Gouqi Island, East China Sea. Three types of mesh bags with different mesh size (2, 0.5, and 0.01 mm) were used to analyze the mass loss and chemical composition changes of the litter and their relationship with benthic fauna communities. The results indicated that benthic fauna contributed 14.83%–16.69% of the mass loss of <em>S</em>. <em>fusiforme</em> litter. Furthermore, benthic fauna facilitated the reduction of biochemical substances such as carbon, phosphorus, cellulose, and hemicellulose in the litter. A significant negative correlation was found between the number of taxonomic classes and the carbon and phosphorus content (<em>p</em> < 0.05), while the abundance of benthic fauna showed a significant negative correlation with carbon, phosphorus, lignin, cellulose, and hemicellulose content (<em>p</em> < 0.05). The number of taxonomic classes and abundance in the 2 mm mesh bags were also greater than those in the 0.5 mm bags. In conclusion, benthic fauna played a promotive role in the decomposition process of <em>S</em>. <em>fusiforme</em> litter, providing valuable insights into the natural decomposition mechanisms of large seaweed.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"205 ","pages":"Article 107010"},"PeriodicalIF":3.0,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421821","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 biogeographic patterns of coastal fishes: Indicators of tropicalization in the Canary Islands over the last 40 years

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

Marine environmental research

Pub Date : 2025-02-09 DOI: 10.1016/j.marenvres.2025.107002

J.A. González , F. Espino , J.G. González-Lorenzo

The Canary Islands are a key marine biodiversity hotspot in the eastern-central Atlantic. Coastal fishes, characterized by extensive taxonomic and functional diversity, serve as a highly representative group in nearshore environments, occupying a wide range of ecosystems. This study focuses on three significant milestones in the publication of comprehensive checklists for the Canary Islands’ ichthyofauna during 1985–1991, 2002, and 2019–2024. Coastal fish species (0–200 m depth) were reviewed and updated, revealing biogeographic patterns and vertical distribution ranges for the region. The primary aim is to evaluate potential indicators of tropicalization by examining changes in the percentage of fish species with warm-water affinities, thereby identifying shifts in the composition of the Canarian marine ichthyofauna. This approach provides a distinct and complementary perspective on the tropicalization process, particularly its initial phase. Special emphasis is placed on the increasing proportion of warm-water species compared to those with Atlanto-Mediterranean (temperate-water) affinities. Additionally, an inventory was compiled documenting historical records of primarily exotic and non-native species, including their biogeographic patterns, dispersal mechanisms, observed bathymetric ranges, year of first record, current status, and criteria used to classify them as established in the Canary Islands.

{"title":"Changes in biogeographic patterns of coastal fishes: Indicators of tropicalization in the Canary Islands over the last 40 years","authors":"J.A. González , F. Espino , J.G. González-Lorenzo","doi":"10.1016/j.marenvres.2025.107002","DOIUrl":"10.1016/j.marenvres.2025.107002","url":null,"abstract":"<div><div>The Canary Islands are a key marine biodiversity hotspot in the eastern-central Atlantic. Coastal fishes, characterized by extensive taxonomic and functional diversity, serve as a highly representative group in nearshore environments, occupying a wide range of ecosystems. This study focuses on three significant milestones in the publication of comprehensive checklists for the Canary Islands’ ichthyofauna during 1985–1991, 2002, and 2019–2024. Coastal fish species (0–200 m depth) were reviewed and updated, revealing biogeographic patterns and vertical distribution ranges for the region. The primary aim is to evaluate potential indicators of tropicalization by examining changes in the percentage of fish species with warm-water affinities, thereby identifying shifts in the composition of the Canarian marine ichthyofauna. This approach provides a distinct and complementary perspective on the tropicalization process, particularly its initial phase. Special emphasis is placed on the increasing proportion of warm-water species compared to those with Atlanto-Mediterranean (temperate-water) affinities. Additionally, an inventory was compiled documenting historical records of primarily exotic and non-native species, including their biogeographic patterns, dispersal mechanisms, observed bathymetric ranges, year of first record, current status, and criteria used to classify them as established in the Canary Islands.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"205 ","pages":"Article 107002"},"PeriodicalIF":3.0,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421823","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

Identifying surviving Pinna nobilis after the Mass Mortality Event (MME) in the Mediterranean: Proposal of a low-risk methodology for collecting genetic samples

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

Marine environmental research

Pub Date : 2025-02-08 DOI: 10.1016/j.marenvres.2025.107006

Pilar Martínez-Martínez , Raquel López-Nuñez , Yolanda Fernández-Torquemada , Emilio Cortés-Melendreras , Miguel Valverde-Urrea , Federico Lopez-Moya , Francisca Giménez-Casalduero

The critically endangered species, Pinna nobilis, has nearly disappeared from the Mediterranean Sea, primarily due to infection by the protozoan parasite Haplosporidium pinnae. However, some individuals survive in specific areas with favorable environmental conditions, such as water salinity and temperature. On the Spanish coast, the only two surviving populations are confined to the Ebro Delta and the Mar Menor coastal lagoon. Some resistant P. nobilis specimens have been found in the areas affected by mass mortality. It is sometimes difficult to distinguish between P. nobilis and P. rudis specimens by external morphological characteristics. Only genetic analysis allows unambiguous discrimination between the two species and even the detection of hybrid specimens. Biopsies, as a traditional sampling method for obtaining samples for genetic analysis, have proven to be an aggressive technique that causes high mortality rates among biopsied specimens, both in surviving specimens in natural environments and in stabled specimens kept in captivity ex situ. Therefore, it is important to look for sampling techniques that do not pose a risk to the health status of the specimens. This study focuses on the development of a novel methodology for obtaining samples for genetic studies. A survey of Pinna spp. individuals in open waters along the Mediterranean coast of spanish levantine area (western Mediterranean) was conducted. To identify the species of the individuals found and distinguish them from the closely related P. rudis, a new, less invasive methodology for genetic sampling was used. By collecting environmental DNA (eDNA) from the water inside the valves of 13 Pinna spp. individuals, a potential surviving specimen of Pinna nobilis was identified in the coast of Murcia (SE Spain).

{"title":"Identifying surviving Pinna nobilis after the Mass Mortality Event (MME) in the Mediterranean: Proposal of a low-risk methodology for collecting genetic samples","authors":"Pilar Martínez-Martínez , Raquel López-Nuñez , Yolanda Fernández-Torquemada , Emilio Cortés-Melendreras , Miguel Valverde-Urrea , Federico Lopez-Moya , Francisca Giménez-Casalduero","doi":"10.1016/j.marenvres.2025.107006","DOIUrl":"10.1016/j.marenvres.2025.107006","url":null,"abstract":"<div><div>The critically endangered species, <em>Pinna nobilis</em>, has nearly disappeared from the Mediterranean Sea, primarily due to infection by the protozoan parasite <em>Haplosporidium pinnae</em>. However, some individuals survive in specific areas with favorable environmental conditions, such as water salinity and temperature. On the Spanish coast, the only two surviving populations are confined to the Ebro Delta and the Mar Menor coastal lagoon. Some resistant <em>P. nobilis</em> specimens have been found in the areas affected by mass mortality. It is sometimes difficult to distinguish between <em>P. nobilis</em> and <em>P. rudis</em> specimens by external morphological characteristics. Only genetic analysis allows unambiguous discrimination between the two species and even the detection of hybrid specimens. Biopsies, as a traditional sampling method for obtaining samples for genetic analysis, have proven to be an aggressive technique that causes high mortality rates among biopsied specimens, both in surviving specimens in natural environments and in stabled specimens kept in captivity ex situ. Therefore, it is important to look for sampling techniques that do not pose a risk to the health status of the specimens. This study focuses on the development of a novel methodology for obtaining samples for genetic studies. A survey of <em>Pinna</em> spp. individuals in open waters along the Mediterranean coast of spanish levantine area (western Mediterranean) was conducted. To identify the species of the individuals found and distinguish them from the closely related <em>P</em>. <em>rudis</em>, a new, less invasive methodology for genetic sampling was used. By collecting environmental DNA (eDNA) from the water inside the valves of 13 <em>Pinna</em> spp. individuals, a potential surviving specimen of <em>Pinna nobilis</em> was identified in the coast of Murcia (SE Spain).</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"205 ","pages":"Article 107006"},"PeriodicalIF":3.0,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387398","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

Thalassia hemprichii may benefit from ocean acidification and slightly increased salinity in the future

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

Marine environmental research

Pub Date : 2025-02-08 DOI: 10.1016/j.marenvres.2025.107000

Zhiqiang Shi , Yunfeng Shi , Muqiu Zhao , Kang Wang , Siyang Ma , Qiuying Han

Since the industrial revolution, the direct impacts of elevated CO₂ concentrations, such as ocean acidification, and indirect impacts, such as extreme drought events, have synergistically influenced coastal ecosystems, including seagrass meadow. Consequently, investigating the individual and combined effects of ocean acidification and extreme drought-induced increased salinity on seagrasses is crucial for enhancing the management and monitoring of these ecosystems. This study used a two-factor crossover indoor simulation experiment to thoroughly examine the effects of seawater acidification at pH 7.7 and elevated salinity levels at 43‰ and 51‰ on the physiological responses and growth status of the dominant tropical seagrass species Thalassia hemprichii. The results indicated that seawater acidification at pH 7.7 significantly enhanced the growth rate and photosynthetic activity of T. hemprichii across all salinity levels. A salinity of 43‰ activated certain antioxidant enzymes without inducing severe osmotic stress in T. hemprichii and positively influenced leaf photosynthetic activity, with a 15.6% increase in growth rate compared to the CK group. The extreme salinity of 51‰ imposed osmotic stress, leading to increase in reactive oxygen species and decreased photosynthetic activity and a 52% decrease in growth rate compared to seagrasses in the CK group. Under future scenarios of ocean acidification and frequent extreme droughts, T. hemprichii inhabiting enclosed marine environments may exhibit greater adaptability and secure an ecologically competitive edge. Our findings underscore the importance of conserving declining meadows, forecasting the ecological trajectory of these ecosystems, and managing salinity in lagoons for the well-being of seagrass ecosystems.

{"title":"Thalassia hemprichii may benefit from ocean acidification and slightly increased salinity in the future","authors":"Zhiqiang Shi , Yunfeng Shi , Muqiu Zhao , Kang Wang , Siyang Ma , Qiuying Han","doi":"10.1016/j.marenvres.2025.107000","DOIUrl":"10.1016/j.marenvres.2025.107000","url":null,"abstract":"<div><div>Since the industrial revolution, the direct impacts of elevated CO<sub>2</sub> concentrations, such as ocean acidification, and indirect impacts, such as extreme drought events, have synergistically influenced coastal ecosystems, including seagrass meadow. Consequently, investigating the individual and combined effects of ocean acidification and extreme drought-induced increased salinity on seagrasses is crucial for enhancing the management and monitoring of these ecosystems. This study used a two-factor crossover indoor simulation experiment to thoroughly examine the effects of seawater acidification at pH 7.7 and elevated salinity levels at 43‰ and 51‰ on the physiological responses and growth status of the dominant tropical seagrass species <em>Thalassia hemprichii</em>. The results indicated that seawater acidification at pH 7.7 significantly enhanced the growth rate and photosynthetic activity of <em>T. hemprichii</em> across all salinity levels. A salinity of 43‰ activated certain antioxidant enzymes without inducing severe osmotic stress in <em>T. hemprichii</em> and positively influenced leaf photosynthetic activity, with a 15.6% increase in growth rate compared to the CK group. The extreme salinity of 51‰ imposed osmotic stress, leading to increase in reactive oxygen species and decreased photosynthetic activity and a 52% decrease in growth rate compared to seagrasses in the CK group. Under future scenarios of ocean acidification and frequent extreme droughts, <em>T. hemprichii</em> inhabiting enclosed marine environments may exhibit greater adaptability and secure an ecologically competitive edge. Our findings underscore the importance of conserving declining meadows, forecasting the ecological trajectory of these ecosystems, and managing salinity in lagoons for the well-being of seagrass ecosystems.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"205 ","pages":"Article 107000"},"PeriodicalIF":3.0,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387476","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