Continental Shelf Research最新文献

Why does surface chlorophyll-a bloom in Taiwan Shoal all year round? 为什么台湾浅滩的表层叶绿素-a 常年大量繁殖？

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-02-15 DOI: 10.1016/j.csr.2025.105437

Qi Feng , Rufa’i Isyaku , Yulin Zhu , Ling Hao , An Zhang , Xin Zhou , Haibin Lü

Based on 10 years (January 2012–December 2021) of satellite observations, sea surface chlorophyll-a (Chl-a) was found to be present in the Taiwan Shoal throughout the year. The underlying mechanisms were investigated. The seasonal mechanism was investigated based on satellite remote sensing data, reanalysis data, and Argo buoy data. The relationship between the seasonal variation of Chl-a and sea surface temperature (SST), wind speed, photosynthetically active radiation (PAR) and salinity in Taiwan shoals was calculated. The results revealed that a large amount of Chl-a was present in the study area throughout the year, where the Chl-a concentration reached a maximum of 0.88 mg m⁻³ in July, which was 1.76 times greater than that (0.50 mg m⁻³) in April. In summer, there was increased upwelling and a thinner mixed layer, which pulled the bottom nutrients to the surface and led to the inflow of South China Sea water (SCSW) with Chl-a in the horizontal direction. In winter, the Kuroshio Branch Water (KBW) intrusion and the inflow of Chinese coastal water into the northern part of the Taiwan Strait (TWS) resulted in a zone of high temperature gradient, whereas the strong northeasterly monsoon strengthened the vertical mixing of the study area, which coincided with the zone of high Chl-a values. The combination of nutrient-rich waters, suitable temperatures in spring, and sufficient photosynthetically active radiation (PAR) in autumn provides favorable conditions for the accumulation of surface Chl-a. This study provides valuable insights into the ecological impacts of seasonal variations in Chl-a blooms in the TWS.

{"title":"Why does surface chlorophyll-a bloom in Taiwan Shoal all year round?","authors":"Qi Feng , Rufa’i Isyaku , Yulin Zhu , Ling Hao , An Zhang , Xin Zhou , Haibin Lü","doi":"10.1016/j.csr.2025.105437","DOIUrl":"10.1016/j.csr.2025.105437","url":null,"abstract":"<div><div>Based on 10 years (January 2012–December 2021) of satellite observations, sea surface chlorophyll-a (Chl-a) was found to be present in the Taiwan Shoal throughout the year. The underlying mechanisms were investigated. The seasonal mechanism was investigated based on satellite remote sensing data, reanalysis data, and Argo buoy data. The relationship between the seasonal variation of Chl-a and sea surface temperature (SST), wind speed, photosynthetically active radiation (PAR) and salinity in Taiwan shoals was calculated. The results revealed that a large amount of Chl-a was present in the study area throughout the year, where the Chl-a concentration reached a maximum of 0.88 mg m<sup>−3</sup> in July, which was 1.76 times greater than that (0.50 mg m<sup>−3</sup>) in April. In summer, there was increased upwelling and a thinner mixed layer, which pulled the bottom nutrients to the surface and led to the inflow of South China Sea water (SCSW) with Chl-a in the horizontal direction. In winter, the Kuroshio Branch Water (KBW) intrusion and the inflow of Chinese coastal water into the northern part of the Taiwan Strait (TWS) resulted in a zone of high temperature gradient, whereas the strong northeasterly monsoon strengthened the vertical mixing of the study area, which coincided with the zone of high Chl-a values. The combination of nutrient-rich waters, suitable temperatures in spring, and sufficient photosynthetically active radiation (PAR) in autumn provides favorable conditions for the accumulation of surface Chl-a. This study provides valuable insights into the ecological impacts of seasonal variations in Chl-a blooms in the TWS.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"287 ","pages":"Article 105437"},"PeriodicalIF":2.1,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatio-temporal variability of surface phytoplankton community structure in relation to different water systems in the east China sea coast

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-02-05 DOI: 10.1016/j.csr.2025.105426

Anglu Shen , Shuaishuai Su , Haowen Li , Wei Kang , Rui Jia

The East China Sea coast (ECS) is characterised by a diverse range of landform types, which influence the physical characteristics of the local waters. The spatio-temporal phytoplankton community structure, and the salinity, transparency, and temperature gradients were examined across six different waters of the ECS coast during four seasons. In total, 118 taxa were identified, including 86 Bacillariophyta, 16 Pyrrhophyta, and 16 other taxa. Cluster and multidimensional scaling analyses classified the six study areas into inner the estuary, outer the estuary, and in a semi-enclosed bay. Notable variations were observed in the abundance and species distribution patterns of phytoplankton across the three water types during four seasons. Oscillatoria spp. was the dominant species inner the estuary during the spring, summer, and winter cruises. Coscinodiscus spp. and Skeletonema costatum were the dominant species in all study areas; however, as the main dominant species, there were no significant differences in Coscinodiscus spp. abundance at different dimensional scales. In addition, the biodiversity index values showed no statistically significant differences among the three types of water, except during the summer cruise. Spearman's rank correlation and redundancy analyses showed that the distribution of Chlorophyta was primarily influenced by salinity. In contrast, transparency was the primary driver of phytoplankton abundance for most seasons and temperature exerted the most significant effect on phytoplankton abundance during summer. These findings indicate that physical disturbances are significant for the regulation of the phytoplankton community structure along the ECS coast.

{"title":"Spatio-temporal variability of surface phytoplankton community structure in relation to different water systems in the east China sea coast","authors":"Anglu Shen , Shuaishuai Su , Haowen Li , Wei Kang , Rui Jia","doi":"10.1016/j.csr.2025.105426","DOIUrl":"10.1016/j.csr.2025.105426","url":null,"abstract":"<div><div>The East China Sea coast (ECS) is characterised by a diverse range of landform types, which influence the physical characteristics of the local waters. The spatio-temporal phytoplankton community structure, and the salinity, transparency, and temperature gradients were examined across six different waters of the ECS coast during four seasons. In total, 118 taxa were identified, including 86 Bacillariophyta, 16 Pyrrhophyta, and 16 other taxa. Cluster and multidimensional scaling analyses classified the six study areas into inner the estuary, outer the estuary, and in a semi-enclosed bay. Notable variations were observed in the abundance and species distribution patterns of phytoplankton across the three water types during four seasons. <em>Oscillatoria</em> spp. was the dominant species inner the estuary during the spring, summer, and winter cruises. <em>Coscinodiscus</em> spp. and <em>Skeletonema costatum</em> were the dominant species in all study areas; however, as the main dominant species, there were no significant differences in <em>Coscinodiscus</em> spp. abundance at different dimensional scales. In addition, the biodiversity index values showed no statistically significant differences among the three types of water, except during the summer cruise. Spearman's rank correlation and redundancy analyses showed that the distribution of Chlorophyta was primarily influenced by salinity. In contrast, transparency was the primary driver of phytoplankton abundance for most seasons and temperature exerted the most significant effect on phytoplankton abundance during summer. These findings indicate that physical disturbances are significant for the regulation of the phytoplankton community structure along the ECS coast.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"287 ","pages":"Article 105426"},"PeriodicalIF":2.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bibliometric analysis of microplastics research: Advances and future directions (2020–2024)

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-02-01 DOI: 10.1016/j.csr.2024.105371

Zhilin Xing , Wenting Fu , Liangjie Li , Shan Wu

Microplastics are a critical environmental concern due to their pervasive distribution and hazards. This study used Citespace software for a bibliometric analysis of microplastics research from 2020 to 2024, based on Web of Science papers. It covered sources, distribution, ecotoxicity, human health impacts, and mitigation measures. Findings showed a rapid increase in the number of related publications, with research focus gradually becoming more specialized, including advances in specific areas such as pollution status, ecotoxicology, detection technologies, and pollution control methods. Research focused on high plastic consumption regions like Europe, North America, and Asia, using innovative methods like high-throughput sequencing and nanotechnology. Keywords clustering identified primary research hotspots: microplastic pollution, ecotoxicity, pollution control, and human health impacts. Despite progress, challenges such as incomplete detection methods, the need for better risk assessment models, and improved pollution control technologies remain. This study offers insights and future research directions for microplastics pollution prevention and environmental protection.

{"title":"Bibliometric analysis of microplastics research: Advances and future directions (2020–2024)","authors":"Zhilin Xing , Wenting Fu , Liangjie Li , Shan Wu","doi":"10.1016/j.csr.2024.105371","DOIUrl":"10.1016/j.csr.2024.105371","url":null,"abstract":"<div><div>Microplastics are a critical environmental concern due to their pervasive distribution and hazards. This study used Citespace software for a bibliometric analysis of microplastics research from 2020 to 2024, based on Web of Science papers. It covered sources, distribution, ecotoxicity, human health impacts, and mitigation measures. Findings showed a rapid increase in the number of related publications, with research focus gradually becoming more specialized, including advances in specific areas such as pollution status, ecotoxicology, detection technologies, and pollution control methods. Research focused on high plastic consumption regions like Europe, North America, and Asia, using innovative methods like high-throughput sequencing and nanotechnology. Keywords clustering identified primary research hotspots: microplastic pollution, ecotoxicity, pollution control, and human health impacts. Despite progress, challenges such as incomplete detection methods, the need for better risk assessment models, and improved pollution control technologies remain. This study offers insights and future research directions for microplastics pollution prevention and environmental protection.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"285 ","pages":"Article 105371"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrogeochemical evaluation of Caleta de Los Loros Patagonian salt marsh in response to the geomorphological evolution of the coast during the Holocene

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-02-01 DOI: 10.1016/j.csr.2025.105403

Eleonora Carol , Rosario Acosta , Guido Borzi , María Paula Leal , Mattia Gaiolini

Sea level oscillations occurred during the Quaternary conditioned the marsh landscape by limiting the factors that regulate water salinity in this environment. The aim of this work was to evaluate geochemical processes that condition groundwater salinity in Caleta de Los Loros marsh considering geomorphological – climatic factors associated with the Holocene evolution of this Argentinean Patagonia coastal area. In this sense, a mapping and a geomorphological characterization was performed based on satellite images, digital elevation models and field surveys. A monitoring network including both surface and groundwater was made in order to measure in situ pH and electrical conductivity and to take samples to determine major ions and stable isotopes in the laboratory. The set of results obtained highlights that variations in salinity, major ions composition and isotopic signal recorded in the groundwater of Caleta de Los Loros marsh vary in the different sectors of the intertidal plains resulting from geomorphological evolution from the middle Holocene to the present day. The older intertidal deposits (2100 years B.P.) currently located in the more continental sector host high salinity environments with high marshes vegetated with Salicornia sp. The hydrochemical and isotopic signal indicates that in them salinity responds primarily to evaporitic salt dissolution – precipitation cycles. Meanwhile, more coastal intertidal deposits have less than 500 years and they host low marsh environments vegetated with Spartina sp. Hydrochemistry and isotopic composition in them reflect that tidal water flooding is the main water contribution to the system, being marsh groundwater hydrogeochemichally similar to surface water. Locally, contributions from adjacent beach ridges and hydrochemical variations associated with CO_2(g) dissolution were also recognized. Understanding environmental changes that occur in marshes as a product of their geomorphological quaternary evolution allows to understand the distribution of salinity patterns that develop in them and to give an idea of the time scale on which the salinization of these environments occurs.

{"title":"Hydrogeochemical evaluation of Caleta de Los Loros Patagonian salt marsh in response to the geomorphological evolution of the coast during the Holocene","authors":"Eleonora Carol , Rosario Acosta , Guido Borzi , María Paula Leal , Mattia Gaiolini","doi":"10.1016/j.csr.2025.105403","DOIUrl":"10.1016/j.csr.2025.105403","url":null,"abstract":"<div><div>Sea level oscillations occurred during the Quaternary conditioned the marsh landscape by limiting the factors that regulate water salinity in this environment. The aim of this work was to evaluate geochemical processes that condition groundwater salinity in Caleta de Los Loros marsh considering geomorphological – climatic factors associated with the Holocene evolution of this Argentinean Patagonia coastal area. In this sense, a mapping and a geomorphological characterization was performed based on satellite images, digital elevation models and field surveys. A monitoring network including both surface and groundwater was made in order to measure <em>in situ</em> pH and electrical conductivity and to take samples to determine major ions and stable isotopes in the laboratory. The set of results obtained highlights that variations in salinity, major ions composition and isotopic signal recorded in the groundwater of Caleta de Los Loros marsh vary in the different sectors of the intertidal plains resulting from geomorphological evolution from the middle Holocene to the present day. The older intertidal deposits (2100 years B.P.) currently located in the more continental sector host high salinity environments with high marshes vegetated with <em>Salicornia</em> sp. The hydrochemical and isotopic signal indicates that in them salinity responds primarily to evaporitic salt dissolution – precipitation cycles. Meanwhile, more coastal intertidal deposits have less than 500 years and they host low marsh environments vegetated with <em>Spartina</em> sp. Hydrochemistry and isotopic composition in them reflect that tidal water flooding is the main water contribution to the system, being marsh groundwater hydrogeochemichally similar to surface water. Locally, contributions from adjacent beach ridges and hydrochemical variations associated with CO<sub>2(g)</sub> dissolution were also recognized. Understanding environmental changes that occur in marshes as a product of their geomorphological quaternary evolution allows to understand the distribution of salinity patterns that develop in them and to give an idea of the time scale on which the salinization of these environments occurs.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"285 ","pages":"Article 105403"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Polycyclic aromatic hydrocarbons and their derivatives in sediments from the Okinawa Trough and South China Sea: Occurrence, sources, profiles, and implications for anthropogenic activities

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-02-01 DOI: 10.1016/j.csr.2025.105406

Jin-Yun Li , Ye-Yang Hou , Wan-Jun Liao , Ying Guo , Yong He , Liang-Ying Liu

Sediments from the Middle Okinawa Trough (MOT) and Southwest Basin were analyzed for polycyclic aromatic hydrocarbons (PAHs) and their halogenated and nitrated derivatives. No halogenated PAHs were detected, whereas 6 nitrated PAHs were observed in three samples from the MOT (0.960−6.46 ng/g). The concentrations of Σ₁₈PAH in the sediment of the MOT (average124 ng/g) were statistically higher than those of the Southwest Basin (39.7 ng/g). The MOT sediments were dominated by 4−5-ring PAHs, whereas the Southwest Basin sediments were dominated by 3-ring PAHs. The regional differences in concentrations and composition profiles were likely due to the different patterns of regional environmental and/or anthropogenic factors, e.g., climate and energy consumption. Sedimentary PAHs in the MOT were primarily derived from petroleum and/or petroleum combustion, while those in the Southwest Basin were mainly from petroleum. The findings suggest that environmental management and pollution control strategies should consider the specific pollution source in different regions.

{"title":"Polycyclic aromatic hydrocarbons and their derivatives in sediments from the Okinawa Trough and South China Sea: Occurrence, sources, profiles, and implications for anthropogenic activities","authors":"Jin-Yun Li , Ye-Yang Hou , Wan-Jun Liao , Ying Guo , Yong He , Liang-Ying Liu","doi":"10.1016/j.csr.2025.105406","DOIUrl":"10.1016/j.csr.2025.105406","url":null,"abstract":"<div><div>Sediments from the Middle Okinawa Trough (MOT) and Southwest Basin were analyzed for polycyclic aromatic hydrocarbons (PAHs) and their halogenated and nitrated derivatives. No halogenated PAHs were detected, whereas 6 nitrated PAHs were observed in three samples from the MOT (0.960−6.46 ng/g). The concentrations of Σ<sub>18</sub>PAH in the sediment of the MOT (average124 ng/g) were statistically higher than those of the Southwest Basin (39.7 ng/g). The MOT sediments were dominated by 4−5-ring PAHs, whereas the Southwest Basin sediments were dominated by 3-ring PAHs. The regional differences in concentrations and composition profiles were likely due to the different patterns of regional environmental and/or anthropogenic factors, e.g., climate and energy consumption. Sedimentary PAHs in the MOT were primarily derived from petroleum and/or petroleum combustion, while those in the Southwest Basin were mainly from petroleum. The findings suggest that environmental management and pollution control strategies should consider the specific pollution source in different regions.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"285 ","pages":"Article 105406"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Macrofauna community structure and population dynamics in the Flemish bank region: Assessing long-term change in the Anthropocene

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-02-01 DOI: 10.1016/j.csr.2024.105387

Sarah Broos , Gert Van Hoey , Carl Van Colen

Benthic communities in continental shelf seas are influenced by human activities, yet assessing long-term change remains impeded by the scarcity of baseline data predating the proliferation of human activities. In this study, we considered the oldest macrofauna data from Van Veen samples collected in autumn 1970–1971 in a shallow soft-sediment seabed south of the Nieuwpoort Bank in the Belgian Part of the North Sea (BPNS). Both archived data in notebooks and hitherto unprocessed samples were considered. The community structure and biodiversity of these samples were compared with samples from autumn 2016. Furthermore, we compared (bi)monthly dynamics of indicator taxa for muddy sands (Abra spp.) and fine-medium sands (Nephtys spp.) present in the area with a time series collected in 2002–2003. Our findings reveal that both habitat types became richer in macrofauna species number and diversity. The invasive species that colonized the area between sampling periods explained <1 % of observed community structure changes. Overall, most taxa had higher population densities in 2016 compared to 1970–1971. Population densities varied seasonally, peaking in August 2016, and with less distinct recruitment dynamics in 1970–1971, confirming lower overall population densities in that period, especially for Abra. We discuss these results in relation to datasets discrepancies, climate variability, and sediment fining, acknowledging limitations in sampling design and processing methods. Nevertheless, this data rescue exercise proved valuable for understanding marine ecosystem changes, highlighting the potential of ‘old’ archived data and samples from the early Anthropocene.

{"title":"Macrofauna community structure and population dynamics in the Flemish bank region: Assessing long-term change in the Anthropocene","authors":"Sarah Broos , Gert Van Hoey , Carl Van Colen","doi":"10.1016/j.csr.2024.105387","DOIUrl":"10.1016/j.csr.2024.105387","url":null,"abstract":"<div><div>Benthic communities in continental shelf seas are influenced by human activities, yet assessing long-term change remains impeded by the scarcity of baseline data predating the proliferation of human activities. In this study, we considered the oldest macrofauna data from Van Veen samples collected in autumn 1970–1971 in a shallow soft-sediment seabed south of the Nieuwpoort Bank in the Belgian Part of the North Sea (BPNS). Both archived data in notebooks and hitherto unprocessed samples were considered. The community structure and biodiversity of these samples were compared with samples from autumn 2016. Furthermore, we compared (bi)monthly dynamics of indicator taxa for muddy sands (<em>Abra</em> spp.) and fine-medium sands (<em>Nephtys</em> spp.) present in the area with a time series collected in 2002–2003. Our findings reveal that both habitat types became richer in macrofauna species number and diversity. The invasive species that colonized the area between sampling periods explained <1 % of observed community structure changes. Overall, most taxa had higher population densities in 2016 compared to 1970–1971. Population densities varied seasonally, peaking in August 2016, and with less distinct recruitment dynamics in 1970–1971, confirming lower overall population densities in that period, especially for Abra. We discuss these results in relation to datasets discrepancies, climate variability, and sediment fining, acknowledging limitations in sampling design and processing methods. Nevertheless, this data rescue exercise proved valuable for understanding marine ecosystem changes, highlighting the potential of ‘old’ archived data and samples from the early Anthropocene.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"285 ","pages":"Article 105387"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Contrasting diversity patterns using Autonomous Reef Monitoring Structures deployed in pelagic vs. benthic environments

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-02-01 DOI: 10.1016/j.csr.2024.105358

Ernesto Villarino , Anders Lanzén , Naiara Rodriguez-Ezpeleta , Iñaki Mendibil , Angel Borja , Iñigo Muxika , Xabier Irigoien , Joxe Mikel Garmendia , Guillem Chust

Recent developments of data-driven standardized sampling tools have reduced knowledge gaps on benthic biodiversity and larval dispersal patterns. Here, we present a new application to estimate benthic spatial biodiversity patterns and evaluate potential larval dispersal from nearshore coast to the pelagic environment. To do so, we combined DNA metabarcoding and imagery on Autonomous Reef Monitoring Structures (ARMS) deployed in pelagic and nearshore benthic systems across the Bay of Biscay's Basque Coast. Results reveal a remarkably lower biodiversity in pelagic relative to benthic ARMS as well as strong spatial patterns in community composition with the pelagic ARMS greatly differing to the benthic ones according to both metabarcoding (ANOSIM R = 0.82; p = 0.002) and image analysis (ANOSIM R = 0.87; p = 0.001). We also show that a large portion of the larvae inhabiting the pelagic domain (83.5%) probably originates from benthic habitats, while the benthic community shared across pelagic and benthic habitats is considerably lower (24.9%). Further, we also analyzed which benthic species successfully use the pelagic environment to disperse across the ocean from nearshore coast, and found that the unique benthic taxa inhabiting the pelagic ARMS consist of organisms with typically larger dispersal distances relative to strictly sessile taxa with direct larvae development found only in rock-attached benthic ARMS. Overall, these findings suggest that the benthic system acts as population source delivering species towards a less diverse pelagic domain. Taken together, this novel application of ARMS deployed in pelagic systems has the potential to identify the often overlooked yet critically important benthic community structure, as well as to unveil how dispersal pathways across benthic and pelagic habitats can shape biodiversity patterns of coastal ecosystems.

{"title":"Contrasting diversity patterns using Autonomous Reef Monitoring Structures deployed in pelagic vs. benthic environments","authors":"Ernesto Villarino , Anders Lanzén , Naiara Rodriguez-Ezpeleta , Iñaki Mendibil , Angel Borja , Iñigo Muxika , Xabier Irigoien , Joxe Mikel Garmendia , Guillem Chust","doi":"10.1016/j.csr.2024.105358","DOIUrl":"10.1016/j.csr.2024.105358","url":null,"abstract":"<div><div>Recent developments of data-driven standardized sampling tools have reduced knowledge gaps on benthic biodiversity and larval dispersal patterns. Here, we present a new application to estimate benthic spatial biodiversity patterns and evaluate potential larval dispersal from nearshore coast to the pelagic environment. To do so, we combined DNA metabarcoding and imagery on Autonomous Reef Monitoring Structures (ARMS) deployed in pelagic and nearshore benthic systems across the Bay of Biscay's Basque Coast. Results reveal a remarkably lower biodiversity in pelagic relative to benthic ARMS as well as strong spatial patterns in community composition with the pelagic ARMS greatly differing to the benthic ones according to both metabarcoding (ANOSIM R = 0.82; <em>p</em> = 0.002) and image analysis (ANOSIM R = 0.87; <em>p</em> = 0.001). We also show that a large portion of the larvae inhabiting the pelagic domain (83.5%) probably originates from benthic habitats, while the benthic community shared across pelagic and benthic habitats is considerably lower (24.9%). Further, we also analyzed which benthic species successfully use the pelagic environment to disperse across the ocean from nearshore coast, and found that the unique benthic taxa inhabiting the pelagic ARMS consist of organisms with typically larger dispersal distances relative to strictly sessile taxa with direct larvae development found only in rock-attached benthic ARMS. Overall, these findings suggest that the benthic system acts as population source delivering species towards a less diverse pelagic domain. Taken together, this novel application of ARMS deployed in pelagic systems has the potential to identify the often overlooked yet critically important benthic community structure, as well as to unveil how dispersal pathways across benthic and pelagic habitats can shape biodiversity patterns of coastal ecosystems.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"285 ","pages":"Article 105358"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seafloor nutrient biogeochemistry and benthic fluxes in the Northeastern Mediterranean sea

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-02-01 DOI: 10.1016/j.csr.2024.105392

İsmail Akçay , Süleyman Tuğrul , Mustafa Yücel

The coastal ecosystem of the Northeastern (NE) Mediterranean Sea has been affected by nutrient inputs originated from regional rivers and wastewater discharges. Sediment porewater nutrient fluxes into the deep waters are strongly associated with eutrophic and suboxic/anoxic conditions. There was only limited number of studies performed on the porewater and sediment biogeochemistry in the NE Mediterranean Sea having oxic conditions in the deep waters. In this study, therefore, sediment porewater nutrient (Si, N, P) and sediment organic matter biogeochemistry were studied. The study results indicated a series of redox reactions as well as remarkable contribution of porewater diffusive nutrient fluxes to the total nutrient budget in the NE Mediterranean Sea. Lower Si/N and higher N/P molar ratios in the total nutrient inputs are very likely to modify phytoplankton composition and abundance in the phosphorus deficient NE Mediterranean productive shelf waters leading to development of mesotrophic/eutrophic conditions in the NE Mediterranean Sea.

引用次数: 0

Seasonal dynamics and environmental drivers of phytoplankton carbon biomass in the southern yellow sea

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-02-01 DOI: 10.1016/j.csr.2025.105404

Shujin Guo , Feng Wang , Qingzhen Yao , Yanqing Wang , Meiping Feng , Xiaoxia Sun

Phytoplankton carbon biomass serves as a valuable indicator of phytoplankton biomass, playing a crucial role in parameterizing ecosystem models. However, studies on phytoplankton carbon biomass have been quite limited in continental seas, providing limited references for understanding their role in the biogeochemical carbon cycle. In this study, we examined phytoplankton carbon biomass in the SYS during the spring, summer, and fall of 2018, and clarified its characteristics, distribution patterns and controlling factors. Phytoplankton carbon biomass ranged from 2.33 to 84.74 μg C/L in spring, 1.19–1454.25 μg C/L in summer, and 0.01–33.20 μg C/L in fall in the SYS. Diatoms were the most dominant group, contributing 53%, 68%, and 67% to the total phytoplankton carbon in spring, summer, and fall, respectively, followed by dinoflagellates, which contributed 46%, 31%, and 30%. The carbon biomass of diatoms and dinoflagellates exhibited quite distinct correlations with environmental factors. Diatoms exhibited stronger nutrient dependency, whereas no significant correlation was observed between dinoflagellates and nutrients, reflecting the different nutritional strategies of the two groups (strict autotrophy vs. mixotrophy). Compared to cell abundance, carbon biomass revealed a significantly higher proportion of dinoflagellate biomass in the community structure, which is primarily due to the significant interspecies variations in cell volume. Dinoflagellates tend to have larger cell volumes compared to diatoms in the SYS, leading to an underestimation of dinoflagellate proportions when using cell abundance alone. This indicates that simply using cell abundance may lead to cognitive bias in recognizing phytoplankton community structure, and taking carbon biomass into account will provide a more comprehensive understanding.

{"title":"Seasonal dynamics and environmental drivers of phytoplankton carbon biomass in the southern yellow sea","authors":"Shujin Guo , Feng Wang , Qingzhen Yao , Yanqing Wang , Meiping Feng , Xiaoxia Sun","doi":"10.1016/j.csr.2025.105404","DOIUrl":"10.1016/j.csr.2025.105404","url":null,"abstract":"<div><div>Phytoplankton carbon biomass serves as a valuable indicator of phytoplankton biomass, playing a crucial role in parameterizing ecosystem models. However, studies on phytoplankton carbon biomass have been quite limited in continental seas, providing limited references for understanding their role in the biogeochemical carbon cycle. In this study, we examined phytoplankton carbon biomass in the SYS during the spring, summer, and fall of 2018, and clarified its characteristics, distribution patterns and controlling factors. Phytoplankton carbon biomass ranged from 2.33 to 84.74 μg C/L in spring, 1.19–1454.25 μg C/L in summer, and 0.01–33.20 μg C/L in fall in the SYS. Diatoms were the most dominant group, contributing 53%, 68%, and 67% to the total phytoplankton carbon in spring, summer, and fall, respectively, followed by dinoflagellates, which contributed 46%, 31%, and 30%. The carbon biomass of diatoms and dinoflagellates exhibited quite distinct correlations with environmental factors. Diatoms exhibited stronger nutrient dependency, whereas no significant correlation was observed between dinoflagellates and nutrients, reflecting the different nutritional strategies of the two groups (strict autotrophy vs. mixotrophy). Compared to cell abundance, carbon biomass revealed a significantly higher proportion of dinoflagellate biomass in the community structure, which is primarily due to the significant interspecies variations in cell volume. Dinoflagellates tend to have larger cell volumes compared to diatoms in the SYS, leading to an underestimation of dinoflagellate proportions when using cell abundance alone. This indicates that simply using cell abundance may lead to cognitive bias in recognizing phytoplankton community structure, and taking carbon biomass into account will provide a more comprehensive understanding.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"285 ","pages":"Article 105404"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Understanding heavy Metal pollution dynamics in Çandarlı Gulf, western Türkiye: Insights from spatial analysis, sediment transport modeling and ecological risk assessment

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-02-01 DOI: 10.1016/j.csr.2024.105393

Muhammet Duman , Atilla Hüsnü Eronat , Ezgi Talas , Murat Cenk Gerdanlı , Caner Tükel

This study investigates the sources, levels, and distribution of heavy metals in the surficial sediments of the Çandarlı Gulf, examining both natural and anthropogenic influences. Using sediment transport models, pollution assessments, and principal component analysis (PCA), have been identified mean metal concentrations in sediments as Zn > Cr > Pb > Ni > Cu > As. PCA revealed five key sources: natural processes, biogenic impacts, anthropogenic activities, industrial runoff, and wastewater. The sediment characteristics vary regionally, with high-energy conditions and sand dominance in the south, and finer materials in the north. High carbonate content in sandy areas links to mechanical abrasion. Trace elements like As, Cr, Cu, Pb and Zn exceed background values in southern and northeastern zones due to activities like container handling and ship dismantling. Ecological risk assessments show frequent adverse effects for Ni and As, and occasional effects for Cu and Zn. The study emphasizes the need for comprehensive pollution control strategies to protect the Çandarlı Gulf's marine ecosystem.

{"title":"Understanding heavy Metal pollution dynamics in Çandarlı Gulf, western Türkiye: Insights from spatial analysis, sediment transport modeling and ecological risk assessment","authors":"Muhammet Duman , Atilla Hüsnü Eronat , Ezgi Talas , Murat Cenk Gerdanlı , Caner Tükel","doi":"10.1016/j.csr.2024.105393","DOIUrl":"10.1016/j.csr.2024.105393","url":null,"abstract":"<div><div>This study investigates the sources, levels, and distribution of heavy metals in the surficial sediments of the Çandarlı Gulf, examining both natural and anthropogenic influences. Using sediment transport models, pollution assessments, and principal component analysis (PCA), have been identified mean metal concentrations in sediments as Zn > Cr > Pb > Ni > Cu > As. PCA revealed five key sources: natural processes, biogenic impacts, anthropogenic activities, industrial runoff, and wastewater. The sediment characteristics vary regionally, with high-energy conditions and sand dominance in the south, and finer materials in the north. High carbonate content in sandy areas links to mechanical abrasion. Trace elements like As, Cr, Cu, Pb and Zn exceed background values in southern and northeastern zones due to activities like container handling and ship dismantling. Ecological risk assessments show frequent adverse effects for Ni and As, and occasional effects for Cu and Zn. The study emphasizes the need for comprehensive pollution control strategies to protect the Çandarlı Gulf's marine ecosystem.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"285 ","pages":"Article 105393"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0