Pub Date : 2025-01-16DOI: 10.1016/j.ecss.2025.109125
Luca Altavilla, Francesco Cavraro, Chiara Facca, Francesco Liaci, Stefano Malavasi
Climate change is expected to significantly alter the distribution of fish organisms, particularly within vulnerable ecosystems like transitional water bodies. The anticipated rise in sea levels and extreme rainfall events could trigger coastal habitat salinisation or freshwater dilution, posing potential threats to resident species of European Community interest. In this study, we examine the impact of salinity fluctuations on the Mediterranean Killifish Aphanius fasciatus, a species listed in Annex II of the Habitat Directive. We employ a behavioural approach, analysing reproductive performance and courtship behaviours across a salinity range of 5–45 pss, both qualitatively and quantitatively. Results reveal the presence of the complete reproductive repertoire across all salinity treatments, including successful egg spawning, emphasising the significance of Mediterranean salt marshes in safeguarding local populations.
{"title":"Reproduction of the mediterranean killifish Aphanius fasciatus at different salinity conditions: Implications for conservation and management","authors":"Luca Altavilla, Francesco Cavraro, Chiara Facca, Francesco Liaci, Stefano Malavasi","doi":"10.1016/j.ecss.2025.109125","DOIUrl":"10.1016/j.ecss.2025.109125","url":null,"abstract":"<div><div>Climate change is expected to significantly alter the distribution of fish organisms, particularly within vulnerable ecosystems like transitional water bodies. The anticipated rise in sea levels and extreme rainfall events could trigger coastal habitat salinisation or freshwater dilution, posing potential threats to resident species of European Community interest. In this study, we examine the impact of salinity fluctuations on the Mediterranean Killifish <em>Aphanius fasciatus</em>, a species listed in Annex II of the Habitat Directive. We employ a behavioural approach, analysing reproductive performance and courtship behaviours across a salinity range of 5–45 pss, both qualitatively and quantitatively. Results reveal the presence of the complete reproductive repertoire across all salinity treatments, including successful egg spawning, emphasising the significance of Mediterranean salt marshes in safeguarding local populations.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"314 ","pages":"Article 109125"},"PeriodicalIF":2.6,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-16DOI: 10.1016/j.ecss.2025.109133
Michael Elliott , Alan K. Whitfield
The essence of an appropriate and expected structure and function of healthy and sustainable estuarine fish communities lies in achieving and maintaining ecological connectivity between and within coastal systems. This connectivity includes a functionality between the associated components of, and links with, the marine and catchment areas. Ensuring such a connectivity involves removing, preventing or overcoming pressures, barriers and impediments to the ecological functional connectivity along the continuum between riverine, estuarine and marine systems. Those barriers may be permanent physical structures or related to temporary seasonal or spatial adverse water quality. The analysis of connectivity between estuaries and adjacent marine and freshwater aquatic ecosystems also requires an understanding of how it may be impacted by climate change. In addition to connectivity, coherence in environmental management has recently been defined as the ability to have the same management and governance measures in different areas that will achieve the same outputs and outcomes of management. In contrast, equivalence has been defined as having different management and governance measures in different areas but, again, that will produce the same outcomes. Using estuary-associated marine, diadromous and estuarine resident fish species as examples, this review presents these concepts and shows the natural and social sciences aspects required to achieve healthy and sustainable estuarine fish populations and communities.
{"title":"Science and management achieving connectivity, coherence and equivalence to ensure the health of estuarine fish communities","authors":"Michael Elliott , Alan K. Whitfield","doi":"10.1016/j.ecss.2025.109133","DOIUrl":"10.1016/j.ecss.2025.109133","url":null,"abstract":"<div><div>The essence of an appropriate and expected structure and function of healthy and sustainable estuarine fish communities lies in achieving and maintaining ecological connectivity between and within coastal systems. This connectivity includes a functionality between the associated components of, and links with, the marine and catchment areas. Ensuring such a connectivity involves removing, preventing or overcoming pressures, barriers and impediments to the ecological functional connectivity along the continuum between riverine, estuarine and marine systems. Those barriers may be permanent physical structures or related to temporary seasonal or spatial adverse water quality. The analysis of connectivity between estuaries and adjacent marine and freshwater aquatic ecosystems also requires an understanding of how it may be impacted by climate change. In addition to connectivity, <em>coherence</em> in environmental management has recently been defined as the ability to have the same management and governance measures in different areas that will achieve the same outputs and outcomes of management. In contrast, <em>equivalence</em> has been defined as having different management and governance measures in different areas but, again, that will produce the same outcomes. Using estuary-associated marine, diadromous and estuarine resident fish species as examples, this review presents these concepts and shows the natural and social sciences aspects required to achieve healthy and sustainable estuarine fish populations and communities.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"314 ","pages":"Article 109133"},"PeriodicalIF":2.6,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-10DOI: 10.1016/j.ecss.2025.109128
Sheng Gao , Xi Feng , Hang Xu , Yirui Wu , Weibing Feng
The randomness and complexity brought by multiple driving factors make it difficult to achieve fast and accurate water level forecasting. This study evaluates the application of three machine learning (ML) models (LSTM, GRU, CNN-LSTM) in non-stationary water level prediction, using the Yangtze Estuary as the test region. The statistical tool Empirical Mode Decomposition (EMD) is used for data pre-processing, and a novel integrated modeling system (EMD-ITG) is proposed. The EMD-ITG systematically combines EMD with various ML algorithms to enhance the accuracy of non-stationary water level forecasting. Results show that by using EMD-ML models, Root Mean Square Errors (RMSEs) are reduced by 5%–34% compared to conventional ML models. In tide-dominated areas (Wusong, Liyashan), GRU achieves the highest prediction accuracy, while in runoff-dominated areas (Zhenjiang), LSTM outperforms the other two. The EMD-ITG model, utilizing a high-frequency-GRU and mid-low-frequency-LSTM architecture, achieves the highest prediction accuracy at all stations, with RMSE reducing by 10–21% and Nash-Sutcliffe Efficiency (NSE) increasing by 0.2–1.2%, as compared to that of EMD-ML models. Additionally, all the EMD-ML models outperform popular harmonic tool, like NS_TIDE, with RMSE reduced by ∼30%. This study emphasizes that signal preprocessing and source interpretation are crucial for training ML models before resuming deep learning. The invented EMD-ITG model also provides a valuable reference for future hydrological forecasting.
{"title":"A hybrid deep learning model based on EMD algorithm for non-stationary water level prediction of estuarine systems","authors":"Sheng Gao , Xi Feng , Hang Xu , Yirui Wu , Weibing Feng","doi":"10.1016/j.ecss.2025.109128","DOIUrl":"10.1016/j.ecss.2025.109128","url":null,"abstract":"<div><div>The randomness and complexity brought by multiple driving factors make it difficult to achieve fast and accurate water level forecasting. This study evaluates the application of three machine learning (ML) models (LSTM, GRU, CNN-LSTM) in non-stationary water level prediction, using the Yangtze Estuary as the test region. The statistical tool Empirical Mode Decomposition (EMD) is used for data pre-processing, and a novel integrated modeling system (EMD-ITG) is proposed. The EMD-ITG systematically combines EMD with various ML algorithms to enhance the accuracy of non-stationary water level forecasting. Results show that by using EMD-ML models, Root Mean Square Errors (RMSEs) are reduced by 5%–34% compared to conventional ML models. In tide-dominated areas (Wusong, Liyashan), GRU achieves the highest prediction accuracy, while in runoff-dominated areas (Zhenjiang), LSTM outperforms the other two. The EMD-ITG model, utilizing a high-frequency-GRU and mid-low-frequency-LSTM architecture, achieves the highest prediction accuracy at all stations, with RMSE reducing by 10–21% and Nash-Sutcliffe Efficiency (NSE) increasing by 0.2–1.2%, as compared to that of EMD-ML models. Additionally, all the EMD-ML models outperform popular harmonic tool, like NS_TIDE, with RMSE reduced by ∼30%. This study emphasizes that signal preprocessing and source interpretation are crucial for training ML models before resuming deep learning. The invented EMD-ITG model also provides a valuable reference for future hydrological forecasting.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"314 ","pages":"Article 109128"},"PeriodicalIF":2.6,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139657","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}
Pub Date : 2025-01-09DOI: 10.1016/j.ecss.2025.109124
J.N. Gamboa-Cutz , S.M. Trevathan-Tackett , S. Cadena , C. McDougall , M.F. Adame
Coastal wetlands are sinks of atmospheric carbon, but they can also emit greenhouse gases (GHGs) such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) from aerobic and anaerobic microbial soil respiration. The amount and direction of fluxes (emissions or uptakes) are variable and likely to depend on the soil microbial community and other environmental factors, such as salinity. Yet few studies have simultaneously measured GHG fluxes, microbial communities and environmental drivers in wetlands across an intertidal gradient. In this study, we sampled fringe mangroves (FM), basin mangroves (BM), saltmarsh (SM), and supratidal forests (SF) in the subtropical east coast of Australia. We found that CO2 and N2O emissions decreased landwards, from the FM to the SF, while CH4 fluxes increased. The beta diversity of bacterial and archaea communities differed significantly among wetland types. Desulfobacterota were common in mangroves, suggesting sulphate reduction, which is responsible for damping CH4 emissions, whereas the presence of Nitrososphaeria on the SF suggests nitrogen cycling, such as nitrification-denitrification, associated with N₂O emissions. Salinity was strongly associated with the variation in microbial communities and the N₂O and CH₄ fluxes. Thus, interstitial salinity and wetland type can explain and potentially predict microbial community composition and their associated GHG fluxes within the intertidal.
{"title":"Microbial communities and soil greenhouse gas fluxes from subtropical tidal and supratidal wetlands","authors":"J.N. Gamboa-Cutz , S.M. Trevathan-Tackett , S. Cadena , C. McDougall , M.F. Adame","doi":"10.1016/j.ecss.2025.109124","DOIUrl":"10.1016/j.ecss.2025.109124","url":null,"abstract":"<div><div>Coastal wetlands are sinks of atmospheric carbon, but they can also emit greenhouse gases (GHGs) such as carbon dioxide (CO<sub>2</sub>), methane (CH<sub>4</sub>), and nitrous oxide (N<sub>2</sub>O) from aerobic and anaerobic microbial soil respiration. The amount and direction of fluxes (emissions or uptakes) are variable and likely to depend on the soil microbial community and other environmental factors, such as salinity. Yet few studies have simultaneously measured GHG fluxes, microbial communities and environmental drivers in wetlands across an intertidal gradient. In this study, we sampled fringe mangroves (FM), basin mangroves (BM), saltmarsh (SM), and supratidal forests (SF) in the subtropical east coast of Australia. We found that CO<sub>2</sub> and N<sub>2</sub>O emissions decreased landwards, from the FM to the SF, while CH<sub>4</sub> fluxes increased. The beta diversity of bacterial and archaea communities differed significantly among wetland types. Desulfobacterota were common in mangroves, suggesting sulphate reduction, which is responsible for damping CH<sub>4</sub> emissions, whereas the presence of Nitrososphaeria on the SF suggests nitrogen cycling, such as nitrification-denitrification, associated with N₂O emissions. Salinity was strongly associated with the variation in microbial communities and the N₂O and CH₄ fluxes. Thus, interstitial salinity and wetland type can explain and potentially predict microbial community composition and their associated GHG fluxes within the intertidal.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"315 ","pages":"Article 109124"},"PeriodicalIF":2.6,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-08DOI: 10.1016/j.ecss.2025.109123
Francisco Maia , Miguel B. Gaspar , Carlos M. Barroso
Research on the biological traits of commercial bivalves is essential for developing effective management strategies and ensuring their sustainable exploitation. This study offers a comparative analysis of the invasive Manila clam R. philippinarum and the native grooved carpet clam R. decussatus in the Ria de Aveiro, Portugal, focusing on shell morphometry, growth, reproductive cycle, condition index, and length at 50% maturity (L50). Analysis of internal shell microgrowth bands revealed that R. philippinarum exhibits a higher growth coefficient (K) than R. decussatus, with von Bertalanffy growth equations of Lt = 59.49 [1 - e −0.78 (t-0.55)] and Lt = 75.09 [1 - e −0.33 (t-0.10)], respectively. Notably, the K value for R. philippinarum is among the highest recorded for this species, indicating exceptional growth performance in the Ria de Aveiro. The reproductive cycle analysis showed that R. philippinarum has a longer and more intense spawning period, extending from April to October 2013 and from April to September 2014, with peaks in August and September. In contrast, R. decussatus exhibited a shorter spawning season, from May to October 2013 and from June to September 2014, peaking in August. Seasonal variations in the condition index, likely linked to food availability and reproductive cycle, showed R. philippinarum in better condition during the early stages of gonadal development, indicating more efficient energy allocation towards reproduction. Rapid growth and fast sexual maturity during the first year of benthic life enable recruits of both species to spawn during the following year's spawning season. R. philippinarum reaches sexual maturity slightly faster than R. decussatus (L50 = 20.0 mm SL vs. L50 = 22.1 mm SL), maturing at around 1.08 years compared to 1.15 years. Although this difference is minor, it enables R. philippinarum recruits to begin reproduction approximately one month earlier in the year. Improved growth rates of R. philippinarum during its second and third years likely enhance reproductive capacity, as larger individuals typically produce more offspring. These results suggest that R. philippinarum has a competitive advantage over R. decussatus due to its faster growth and greater reproductive potential. However, these factors do not conclusively explain the rapid proliferation and establishment of R. philippinarum in the Ria de Aveiro, nor the sudden decline in R. decussatus populations following the introduction of the invasive species. Fishery management strategies are proposed based on two distinct scenarios.
{"title":"Comparative study of Ruditapes philippinarum and Ruditapes decussatus in Ria de Aveiro, Portugal: Invasive species management and marine resource conservation","authors":"Francisco Maia , Miguel B. Gaspar , Carlos M. Barroso","doi":"10.1016/j.ecss.2025.109123","DOIUrl":"10.1016/j.ecss.2025.109123","url":null,"abstract":"<div><div>Research on the biological traits of commercial bivalves is essential for developing effective management strategies and ensuring their sustainable exploitation. This study offers a comparative analysis of the invasive Manila clam <em>R. philippinarum</em> and the native grooved carpet clam <em>R. decussatus</em> in the Ria de Aveiro, Portugal, focusing on shell morphometry, growth, reproductive cycle, condition index, and length at 50% maturity (L50). Analysis of internal shell microgrowth bands revealed that <em>R. philippinarum</em> exhibits a higher growth coefficient (K) than <em>R. decussatus</em>, with von Bertalanffy growth equations of Lt = 59.49 [1 - e <sup>−0.78 (t-0.55)</sup>] and Lt = 75.09 [1 - e <sup>−0.33 (t-0.10)</sup>], respectively. Notably, the <em>K</em> value for <em>R. philippinarum</em> is among the highest recorded for this species, indicating exceptional growth performance in the Ria de Aveiro. The reproductive cycle analysis showed that <em>R. philippinarum</em> has a longer and more intense spawning period, extending from April to October 2013 and from April to September 2014, with peaks in August and September. In contrast, <em>R. decussatus</em> exhibited a shorter spawning season, from May to October 2013 and from June to September 2014, peaking in August. Seasonal variations in the condition index, likely linked to food availability and reproductive cycle, showed <em>R. philippinarum</em> in better condition during the early stages of gonadal development, indicating more efficient energy allocation towards reproduction. Rapid growth and fast sexual maturity during the first year of benthic life enable recruits of both species to spawn during the following year's spawning season. <em>R. philippinarum</em> reaches sexual maturity slightly faster than <em>R. decussatus</em> (L50 = 20.0 mm SL vs. L50 = 22.1 mm SL), maturing at around 1.08 years compared to 1.15 years. Although this difference is minor, it enables <em>R. philippinarum</em> recruits to begin reproduction approximately one month earlier in the year. Improved growth rates of <em>R. philippinarum</em> during its second and third years likely enhance reproductive capacity, as larger individuals typically produce more offspring. These results suggest that <em>R. philippinarum</em> has a competitive advantage over <em>R. decussatus</em> due to its faster growth and greater reproductive potential. However, these factors do not conclusively explain the rapid proliferation and establishment of <em>R. philippinarum</em> in the Ria de Aveiro, nor the sudden decline in <em>R. decussatus</em> populations following the introduction of the invasive species. Fishery management strategies are proposed based on two distinct scenarios.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"314 ","pages":"Article 109123"},"PeriodicalIF":2.6,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139658","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}
{"title":"Corrigendum to “Evolution of benthodemersal fish communities in a changing European estuary at fine and broad temporal scales” [Estuar. Coast Shelf Sci. 301 (June 2024), 108738]","authors":"Romain Lécuyer , Anne-Laure Barillé , Hervé Le Bris , Anik Brind’Amour","doi":"10.1016/j.ecss.2024.109109","DOIUrl":"10.1016/j.ecss.2024.109109","url":null,"abstract":"","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"314 ","pages":"Article 109109"},"PeriodicalIF":2.6,"publicationDate":"2024-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1016/j.ecss.2024.109115
M.J. Lima , A. Rita Carrasco, Óscar Ferreira
Balanced conservation strategies are needed to ensure the protection of wetlands in the twenty-first century. To guarantee the success of wetland restoration projects, it is essential to better understand the characteristics of these fragile sites and the driving mechanisms of change. This study characterised the morphology of wetland platforms at five backbarrier sites distributed around the world and subject to various tidal regimes (micro- to macrotidal). Wetland ecogeomorphologic units were manually mapped and classified into upper-, mid-low marsh, tidal flat and channel, using high-resolution Digital Elevation Models (DEMs). Differences in elevation, slope and hydroperiod metrics between morphological units and study sites were assessed, as well as the influence of tidal range and associated inundation patterns on wetland zonation. Upper and mid-low marshes showed steeper intra-slopes compared to channels and tidal flats, with the latter exhibiting longer hydroperiods. No significant differences in normalised elevation and hydroperiod were detected between study sites. Steeper slopes were observed in microtidal systems compared to meso- and macrotidal systems, likely due to constrained horizontal migration. These findings enhance the understanding of the regional patterns of wetland morphological succession, and highlight that tidal range is not the primary driver of spatial variability in wetland zonation. Moreover, this baseline dataset of morphological thresholds can be used to support future large-scale comparisons and inform sustainable management strategies for coastal wetlands, particularly in the context of climate change. Future studies should analyse additional landscape metrics (e.g., vegetation density, sediment accretion rates) and evaluate the cumulative effects of site-specific drivers on wetland geometry.
{"title":"A walk in wetlands morphology and inundation patterns","authors":"M.J. Lima , A. Rita Carrasco, Óscar Ferreira","doi":"10.1016/j.ecss.2024.109115","DOIUrl":"10.1016/j.ecss.2024.109115","url":null,"abstract":"<div><div>Balanced conservation strategies are needed to ensure the protection of wetlands in the twenty-first century. To guarantee the success of wetland restoration projects, it is essential to better understand the characteristics of these fragile sites and the driving mechanisms of change. This study characterised the morphology of wetland platforms at five backbarrier sites distributed around the world and subject to various tidal regimes (micro- to macrotidal). Wetland ecogeomorphologic units were manually mapped and classified into upper-, mid-low marsh, tidal flat and channel, using high-resolution Digital Elevation Models (DEMs). Differences in elevation, slope and hydroperiod metrics between morphological units and study sites were assessed, as well as the influence of tidal range and associated inundation patterns on wetland zonation. Upper and mid-low marshes showed steeper intra-slopes compared to channels and tidal flats, with the latter exhibiting longer hydroperiods. No significant differences in normalised elevation and hydroperiod were detected between study sites. Steeper slopes were observed in microtidal systems compared to meso- and macrotidal systems, likely due to constrained horizontal migration. These findings enhance the understanding of the regional patterns of wetland morphological succession, and highlight that tidal range is not the primary driver of spatial variability in wetland zonation. Moreover, this baseline dataset of morphological thresholds can be used to support future large-scale comparisons and inform sustainable management strategies for coastal wetlands, particularly in the context of climate change. Future studies should analyse additional landscape metrics (e.g., vegetation density, sediment accretion rates) and evaluate the cumulative effects of site-specific drivers on wetland geometry.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"314 ","pages":"Article 109115"},"PeriodicalIF":2.6,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139662","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}
Pub Date : 2024-11-27DOI: 10.1016/j.ecss.2024.109066
Matia Pavkovic , Alexandre Carpentier , Sylvain Duhamel , Laure Carassou , Jérémy Lobry , Eric Feunteun , Nils Teichert
Estuaries are complex ecotones including multiple lateral habitats that play essential functions for fish assemblages. However, the distribution of fish diversity and community assembly processes remain poorly documented in these habitats. This paper investigated the taxonomic and functional diversities of fish assemblages along lateral continuums of three salinity areas over the longitudinal gradient of the Seine Estuary. We examined fish diversity at a local scale (⍺-diversity) and between local scales (β-diversity) across the lateral habitats (estuarine main channel, tidal marsh, and diked marsh). Overall, the taxonomic diversity follows a typical ecotone distribution, with the highest richness reported at the system margins and high species dissimilarity between communities. The decrease of functional diversity in upper part of the lateral ecotone probably reflects the homogenisation of ecological niches. Changes in assembly processes between the three salinity conditions suggests that several lateral ecotones occur in estuaries with complementary functions for fish assemblages.
{"title":"Estuarine lateral ecotones shape taxonomic and functional structure of fish assemblages. The case of the Seine Estuary, France","authors":"Matia Pavkovic , Alexandre Carpentier , Sylvain Duhamel , Laure Carassou , Jérémy Lobry , Eric Feunteun , Nils Teichert","doi":"10.1016/j.ecss.2024.109066","DOIUrl":"10.1016/j.ecss.2024.109066","url":null,"abstract":"<div><div>Estuaries are complex ecotones including multiple lateral habitats that play essential functions for fish assemblages. However, the distribution of fish diversity and community assembly processes remain poorly documented in these habitats. This paper investigated the taxonomic and functional diversities of fish assemblages along lateral continuums of three salinity areas over the longitudinal gradient of the Seine Estuary. We examined fish diversity at a local scale (⍺-diversity) and between local scales (β-diversity) across the lateral habitats (estuarine main channel, tidal marsh, and diked marsh). Overall, the taxonomic diversity follows a typical ecotone distribution, with the highest richness reported at the system margins and high species dissimilarity between communities. The decrease of functional diversity in upper part of the lateral ecotone probably reflects the homogenisation of ecological niches. Changes in assembly processes between the three salinity conditions suggests that several lateral ecotones occur in estuaries with complementary functions for fish assemblages.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"313 ","pages":"Article 109066"},"PeriodicalIF":2.6,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757316","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}
Pub Date : 2024-11-26DOI: 10.1016/j.ecss.2024.109059
Kyung Ah Koo , James A. Nelson , Emily S. Davenport , Charles S. Hopkinson
We used four stable isotopes to determine the spatial variability in the diet of Mya arenaria in the Plum Island Sound estuary, Massachusetts, USA and compared diet to the production rate of dietary food sources. Clams were collected for a year along the estuary and their diet determined at each site with four stable isotopes, δ13C, δ15N, δ34S and δ2H, using the Bayesian mixing model (MixSIAR). We compared diet composition and its quality to patterns of clam production. The results showed that M. arenaria depended on locally produced organic matter, the availability of which varied along the estuary. For the lower estuary, the dominant food source for clams was ocean/estuarine unicellular algal particulate organic matter followed by salt marsh detritus. Brackish and riverine organic matter sources were of secondary importance. For the upper estuary, the relative importance of brackish marsh and riverine organic matter increased. The net inputs of organic matter from the river, tidal marshes and unicellular algae were closely matched with the dietary composition of clams. The down estuary pattern of increasing clam productivity was best predicted by a similar pattern in suspended particulate organic matter quality as indicated by the ratio of C:N. The C:N ratio decreased from about 10.5:1 to 7.4:1 along the region of clam growth. We also found that δ2H was a useful tracer, effectively discriminating between marsh-derived and aquatic algae-derived organic matters and significantly increasing the predictive power and reliability of the mixing model. Our study provides fundamental knowledge on suitable habitats for the M. arenaria growth in the Plum Island estuary and insights into selecting stable isotopes for elucidating feeding ecology and trophic dynamics of estuarine organisms.
{"title":"Clam diet and production in relation to the spatial pattern of food source inputs and quality: A stable isotope approach","authors":"Kyung Ah Koo , James A. Nelson , Emily S. Davenport , Charles S. Hopkinson","doi":"10.1016/j.ecss.2024.109059","DOIUrl":"10.1016/j.ecss.2024.109059","url":null,"abstract":"<div><div>We used four stable isotopes to determine the spatial variability in the diet of <em>Mya arenaria</em> in the Plum Island Sound estuary, Massachusetts, USA and compared diet to the production rate of dietary food sources. Clams were collected for a year along the estuary and their diet determined at each site with four stable isotopes, δ<sup>13</sup>C, δ<sup>15</sup>N, δ<sup>34</sup>S and δ<sup>2</sup>H, using the Bayesian mixing model (MixSIAR). We compared diet composition and its quality to patterns of clam production. The results showed that <em>M. arenaria</em> depended on locally produced organic matter, the availability of which varied along the estuary. For the lower estuary, the dominant food source for clams was ocean/estuarine unicellular algal particulate organic matter followed by salt marsh detritus. Brackish and riverine organic matter sources were of secondary importance. For the upper estuary, the relative importance of brackish marsh and riverine organic matter increased. The net inputs of organic matter from the river, tidal marshes and unicellular algae were closely matched with the dietary composition of clams. The down estuary pattern of increasing clam productivity was best predicted by a similar pattern in suspended particulate organic matter quality as indicated by the ratio of C:N. The C:N ratio decreased from about 10.5:1 to 7.4:1 along the region of clam growth. We also found that δ<sup>2</sup>H was a useful tracer, effectively discriminating between marsh-derived and aquatic algae-derived organic matters and significantly increasing the predictive power and reliability of the mixing model. Our study provides fundamental knowledge on suitable habitats for the <em>M. arenaria</em> growth in the Plum Island estuary and insights into selecting stable isotopes for elucidating feeding ecology and trophic dynamics of estuarine organisms.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"313 ","pages":"Article 109059"},"PeriodicalIF":2.6,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-26DOI: 10.1016/j.ecss.2024.109063
Vikranth Teppala, Ashwin Gurjar, Prasad K. Bhaskaran
The tidal dynamics in estuarine and creek environments are quite complex and depend primarily on tides, waves, wind, water depth, and riverine inflow conditions. A proper understanding of tidal dynamics is very essential in terms of estuarine circulation, mixing and dispersion of pollutants and effective estuarine management. Lagrangian-based monitoring provides spatial and temporal variability compared with Eulerian-based measurement system. The present study proposes a low-cost Global Navigation Satellite System (GNSS) tracked shallow water surface drifter, developed considering minimal wind slip, higher submerged drag force, and low heave accelerations for different designs. A drifter design with four vertical fins and two damping discs attached at the top and bottom satisfied the design criteria and has been used in this study. A low-cost GNSS receiver u-blox Navigation Engine On-board (NEO) M8N was installed in the surface drifter considering the relative position error, velocity variability, and satellite visibility employing an Android smartphone-based GNSS receiver. Low-cost GNSS receiver recorded low positional error and low-velocity variability, and a higher percentage of satellite visbility was recorded during the stationary test. Field deployments were conducted with the surface drifter for different months. The estimated surface tidal current velocity showed monthly variability and was dependent on the tidal phase. Further, the trajectory of the surface drifter could properly identify the changes in flow direction across the creek due to phase shifts from high to low tides. The developed low-cost GNSS-tracked surface drifter can be effectively used to monitor the surface tidal dynamics in the creek environment.
{"title":"Design and development of a low-cost GNSS-tracked surface drifter for investigating tidal currents in a creek environment","authors":"Vikranth Teppala, Ashwin Gurjar, Prasad K. Bhaskaran","doi":"10.1016/j.ecss.2024.109063","DOIUrl":"10.1016/j.ecss.2024.109063","url":null,"abstract":"<div><div>The tidal dynamics in estuarine and creek environments are quite complex and depend primarily on tides, waves, wind, water depth, and riverine inflow conditions. A proper understanding of tidal dynamics is very essential in terms of estuarine circulation, mixing and dispersion of pollutants and effective estuarine management. Lagrangian-based monitoring provides spatial and temporal variability compared with Eulerian-based measurement system. The present study proposes a low-cost Global Navigation Satellite System (GNSS) tracked shallow water surface drifter, developed considering minimal wind slip, higher submerged drag force, and low heave accelerations for different designs. A drifter design with four vertical fins and two damping discs attached at the top and bottom satisfied the design criteria and has been used in this study. A low-cost GNSS receiver u-blox Navigation Engine On-board (NEO) M8N was installed in the surface drifter considering the relative position error, velocity variability, and satellite visibility employing an Android smartphone-based GNSS receiver. Low-cost GNSS receiver recorded low positional error and low-velocity variability, and a higher percentage of satellite visbility was recorded during the stationary test. Field deployments were conducted with the surface drifter for different months. The estimated surface tidal current velocity showed monthly variability and was dependent on the tidal phase. Further, the trajectory of the surface drifter could properly identify the changes in flow direction across the creek due to phase shifts from high to low tides. The developed low-cost GNSS-tracked surface drifter can be effectively used to monitor the surface tidal dynamics in the creek environment.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"313 ","pages":"Article 109063"},"PeriodicalIF":2.6,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743633","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}
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