Shu-Yen Huang , Wei-Jen Lin , Li-Hua Lee , Hsing-Juh Lin
{"title":"Community metabolism and greenhouse gas emissions in abandoned tropical salt pans","authors":"Shu-Yen Huang , Wei-Jen Lin , Li-Hua Lee , Hsing-Juh Lin","doi":"10.1016/j.ecss.2025.109327","DOIUrl":"10.1016/j.ecss.2025.109327","url":null,"abstract":"<div><div>A large area of coastal wetlands has been converted into solar salt pans over thousands of years. However, salt production declined significantly from the 20th century onward, leading to the abandonment of many salt pans globally. Coastal wetlands are generally recognized as blue carbon ecosystems, but little is known about the carbon flux of abandoned salt pans. This study aimed to assess the carbon flux of abandoned tropical salt pans, using a case study in Budai, southwestern Taiwan by measuring community metabolism and greenhouse gas (GHG) emissions. The results of community metabolism showed that the pelagic community of the salt pans is autotrophic, which is closely related to water chlorophyll <em>a</em> concentration. However, the benthic community is heterotrophic, which is influenced by water temperature and dissolved inorganic phosphorus concentration. The combined metabolism of pelagic and benthic communities in the salt pans exhibited an average carbon absorption of 111.5 g C m<sup>−2</sup> yr<sup>−1</sup>. The results of GHG emissions measured with floating chambers indicated that the CO<sub>2</sub> flux into the salt pans averaged 139.3 g CO<sub>2</sub> m<sup>−2</sup> yr<sup>−1</sup>, but a small amount of averaging 354.8 mg CH<sub>4</sub> m<sup>−2</sup> yr<sup>−1</sup> and 136.0 mg N<sub>2</sub>O m<sup>−2</sup> yr<sup>−1</sup> was emitted from the salt pans. Consequently, the net GHG balance indicated that the salt pans serve as systems for removing GHG at an average rate of 92.6 g CO<sub>2</sub>e m<sup>−2</sup> yr<sup>−1</sup>. The CO<sub>2</sub> removal capacity of abandoned tropical salt pans performed better than that of unvegetated coastal wetlands, showing the potential to mitigate climate change.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"321 ","pages":"Article 109327"},"PeriodicalIF":2.6,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143924233","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":"Constancy and change in macrobenthic abundance, biodiversity and assemblage structure along the axis of a flood-tidal sand delta","authors":"R.S.K. Barnes","doi":"10.1016/j.ecss.2025.109326","DOIUrl":"10.1016/j.ecss.2025.109326","url":null,"abstract":"<div><div>Flood-tidal deltas commonly occur along microtidal coasts in the mouths of those inlets kept open by tidal currents, but they have seldom been studied ecologically. Such a delta of fine sand occurs in the Knysna estuarine bay, South Africa, extending for some 2 km upstream. Although macrofaunal assemblage metrics (overall abundance, observed and estimated species density, geometric mean morphospecies abundance, evenness, and patchiness) varied little along the deltaic axis, faunal composition changed markedly though without species replacement except in the paraonid polychaetes. Unusually, the sand was dominated by these paraonids (especially <em>Paradoneis lyra capensis</em>) and, over its proximal half, also by the amphipod <em>Urothoe pulchella</em>, but worms steadily increased in importance upstream whilst crustaceans decreased. Noteworthily, a psammodrilid was present - the first record from Africa. The flood-tidal shore fauna contrasted in composition with that of the facing ebb-channel shore (dominated by <em>Dipolydora</em>) and areas upstream of the mouth.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"321 ","pages":"Article 109326"},"PeriodicalIF":2.6,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902401","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}
Sophie Kache , Iris Liskow , Johannes Pein , Mindaugas Žilius , Maren Voss
{"title":"The role of retention processes in the coastal filter of the Oder River","authors":"Sophie Kache , Iris Liskow , Johannes Pein , Mindaugas Žilius , Maren Voss","doi":"10.1016/j.ecss.2025.109325","DOIUrl":"10.1016/j.ecss.2025.109325","url":null,"abstract":"<div><div>Riverine nutrient export significantly impacts coastal and shelf seas, causing eutrophication. However, nutrient export can be mitigated by the coastal filter function, potentially resulting in permanent removal of nutrients through denitrification. Besides removal, nutrients can also be retained in the coastal zone through assimilation, remineralisation or nitrification, with repeated recycling prolonging their availability to organisms. While removal processes have been extensively studied, their effect on the riverine dissolved inorganic nitrogen (DIN) loads reaching the coast may be small. There are only a few accurate estimates that include all processes of the coastal filter. In this study, nutrient concentrations and net autotrophic uptake rates in the water column, together with benthic NO<sub>3</sub><sup>−</sup> reduction rates and solute fluxes across the sediment-water interface, were measured. We compared a lagoon with the open coast within the outflow area of the Oder River, one of the largest inflows to the southern Baltic Sea, over a seasonal cycle. Particle drift experiments using hydrodynamic model simulations of the Oder estuary yielded water residence times (WRT) along the outflow. In the lagoon, DIN concentrations, primary production and DIN uptake rates were higher than at the coastal station. The data suggested efficient DIN retention, as the majority of riverine DIN was assimilated (85 %), with a preference for NH<sub>4</sub><sup>+</sup> over NO<sub>3</sub><sup>−</sup> uptake. High retention in the lagoon was supported by long WRT of up to 180 days. In the open coast, productivity was lower due to continuous dilution of riverine nutrients by transport processes. The sediment served as a periodic source of nutrients for water column processes. Our data suggest that intense recycling in the water column and strong benthic-pelagic coupling promote a tightly coupled nitrification-denitrification, resulting in vital N removal rates in the sediment. Nevertheless, strong predominance of N retention processes, and specifically assimilation over N removal processes, illustrates that the former is an important component of the coastal filter function, as it provides substrates for nutrient removal (organic matter and NO<sub>3</sub><sup>−</sup>). These results extend the assessment of the effectiveness of the coastal filter and should be taken into account in further studies.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"322 ","pages":"Article 109325"},"PeriodicalIF":2.6,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107837","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":"Microplastics and other plastic-like microdebris in sediments from the Dart River and Estuary, southwest England","authors":"Maia Killian, Andrew Turner","doi":"10.1016/j.ecss.2025.109324","DOIUrl":"10.1016/j.ecss.2025.109324","url":null,"abstract":"<div><div>Surficial sediment samples (<em>n</em> = 10) collected from a transect of a river-estuary (Dart) in southwest England have been analysed for geochemical characteristics, anthropogenic metals (Cr, Cu, Sn, Pb, Zn), and microplastics (∼50 μm–5 mm) and other microplastic-like debris. Results indicated the finest grains towards the lower river and upper estuary, a seaward increase in sedimentary Ca, and loss on ignition ranging from about 0.7 to 4 %. Anthropogenic metals were heterogeneously distributed throughout the catchment with maximum concentrations in the river or lower estuary. Microplastics were dominated by fibres, with concentrations ranging from 110 to 1800 kg<sup>−1</sup> and composition either cellulosic (cotton or rayon) or thermoplastic (polyester or acrylic). Microfibre abundance exhibited no clear relationships with geochemical characteristics or anthropogenic metals but fibres were enriched downstream of a wastewater treatment plant and accumulation of larger fibres was greatest where sediments were finest. Other microdebris was observed in four samples and consisted of fragments (mainly paint flakes) and hollow glass beads. Paint flakes identified as antifouling formulations enriched in Cu, Zn and Sn and road markings containing solid glass beads. Maximum sediment Cu and Zn concentrations coincided with the location where the majority of paint flakes (>2000 kg<sup>−1</sup>) were encountered. While not all microscopic particles identified in the present study are plastic, they share similar properties and likely have common impacts. Accordingly, and more generally, we recommend that a broader array of both plastics and plastic-like particles, coupled with measures of sediment geochemistry and anthropogenic impact, are considered in environmental studies and impact assessments.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"321 ","pages":"Article 109324"},"PeriodicalIF":2.6,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904219","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}
Arame Dièye , Patrick Marchesiello , Bamol Ali Sow , Habib Boubacar Dieng , Duong Hai Thuan , Luc Descroix
{"title":"Tidal amplification and distortion in Guinea-Bissau, West Africa","authors":"Arame Dièye , Patrick Marchesiello , Bamol Ali Sow , Habib Boubacar Dieng , Duong Hai Thuan , Luc Descroix","doi":"10.1016/j.ecss.2025.109318","DOIUrl":"10.1016/j.ecss.2025.109318","url":null,"abstract":"<div><div>Understanding tidal behavior is of paramount importance in Guinea-Bissau, a vulnerable low-lying coastal zone with the highest tidal range of any West African country. Our aim is to improve tide prediction by analyzing its characteristics and mechanisms of amplification and distortion. To this end, we use a high-resolution coastal ocean model (CROCO) validated by tidal altimetry and new tide gauge data. We present and analyze the cotidal charts of the main constituents. The amplification occurs first in coastal waters due to resonance over the broad shelf and strengthens in the estuaries, especially in the Geba Channel where a tidal range of 7 m can be reached. This is due, in part, to the funneling of tidal energy, which travels from the south through the Bijagos Archipelago. There is also a resonance of a quarter wavelength (mode 0) for semi-diurnal tides. In smaller estuaries (e.g., Buba), there is no funneling, so the tides can only be amplified by resonance with reflected waves. A strong tidal asymmetry is also demonstrated due to the generation of overtides that are resonant with mode 1 at Geba and mode 0 at Buba. The asymmetry and Stokes drift associated with the progressive waves in the Geba Channel (leading to tidal setup) make it a complex local system with ebb dominance at the mouth, perhaps contributing to the continuous accretion in the Bijagos archipelago. Other smaller estuaries characterized by standing waves are more classically flood-dominated. All this affects the residence time of water along the coasts and estuaries of Guinea Bissau.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109318"},"PeriodicalIF":2.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887269","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}
Zeng Lei , Zheng Tingting , Zhou Ziyi , Liu Beibei , Li Wuhui , Chen Guobao
{"title":"Biodiversity and spatial heterogeneity of fish communities in response to geo-environmental disturbances","authors":"Zeng Lei , Zheng Tingting , Zhou Ziyi , Liu Beibei , Li Wuhui , Chen Guobao","doi":"10.1016/j.ecss.2025.109322","DOIUrl":"10.1016/j.ecss.2025.109322","url":null,"abstract":"<div><div>Coastal ecosystems are intricately connected to human life. However, increasing human activities have exerted significant pressure on coastal fish communities. Understanding the relationship between fish communities and geo-environmental disturbances is essential for the scientific development of fish conservation and environmental restoration strategies. Despite this importance, our understanding of this relationship remains limited. To address this gap, we established 40 sampling points along the coast of Guangdong in the autumn of 2020 to enhance our understanding of how geo-environmental disturbances have affected the spatial pattern of fish communities. The fish communities along the coast of Guangdong were broadly categorized into three distinct regions (A, B, and C), which were primarily affected by geo-environmental factors including longitude, latitude, depth, and environmental disturbances such as bottom trawling. Notably, biodiversity indicators such as Shannon, Delta+, and FDiv varied significantly in different regions. They were negatively correlated with both longitude and latitude, but positively correlated with water depth and environmental disturbances (W). Furthermore, FDiv served as a critical link between the spatial heterogeneity of fish communities and the geo-environmental disturbances. The spatial average variation degree (SAVD) was positively correlated with biodiversity, but exhibited an opposite pattern with fish community stability. Fish species that significantly contributing to the spatial heterogeneity and stability of fish communities should be prioritized for protection. The results of this study provided valuable insights for developing effective fish conservation strategies within the coastal ecosystem.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109322"},"PeriodicalIF":2.6,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887173","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}
Alexandre da Gama Fernandes Vieira-Júnior , Breno Silva Macário , Steven J. Presley , Michael R. Willig , André Luiz Machado Pessanha
{"title":"Influence of algal drift and morphodynamic conditions on the fish assemblages and feeding guilds in ocean-exposed tropical beaches","authors":"Alexandre da Gama Fernandes Vieira-Júnior , Breno Silva Macário , Steven J. Presley , Michael R. Willig , André Luiz Machado Pessanha","doi":"10.1016/j.ecss.2025.109321","DOIUrl":"10.1016/j.ecss.2025.109321","url":null,"abstract":"<div><div>The surf zones of sandy beaches are habitats in which morphodynamic characteristics (e.g., tide-modified versus wave-dominated beaches) influence the distribution of fish species. In addition, algal drift from adjacent coastal ecosystems (allochthonous material) is an important source of spatial heterogeneity within sandy beach habitats, providing refuge and food resources for fish species. We evaluated the influence of algal drift on the abundance, richness, and biomass of fish assemblages and feeding guilds (i.e. zooplanktivores, piscivores, opportunists and benthivores) on beaches with different exposures to wave conditions. For the entire fish fauna, abundance and species richness, but not biomass, differed between beach exposures. Similarly, abundance and biomass, but not richness of zooplanktivorous fish differed between tide-modified and wave-dominated beaches. In contrast, abundance, but not richness or biomass of benthivorous fish differed among categories of algal volume, while morphodynamic characteristics had no main or interactive effects. Finally, morphodynamic characteristics interacted with differences among categories of algal volume to affect species richness but not abundance or biomass of fish in the opportunist's guild. The size of individuals in the entire fish fauna and in the opportunists guild was affected by beach type and algae volume, whereas in the zooplanktivorous guild size was only affected by algal volume. The size of fish in the benthivorous guild was not affected by algal volume in tide-modified beaches. The responses of fish to morphodynamic conditions and algal drift were guild-specific, suggesting that different strategies may need to be implemented for the conservation or management of these trophic groups.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109321"},"PeriodicalIF":2.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887174","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}
Luke J. Jenkins , Ivan D. Haigh , Dafni E. Sifnioti , Jose Alejandro Pinto Rascon , Addina Inayatillah , Hachem Kassem
{"title":"Non-linear tide-surge interactions around the coast of the UK through the lens of tidal level, phase, and skew surge","authors":"Luke J. Jenkins , Ivan D. Haigh , Dafni E. Sifnioti , Jose Alejandro Pinto Rascon , Addina Inayatillah , Hachem Kassem","doi":"10.1016/j.ecss.2025.109323","DOIUrl":"10.1016/j.ecss.2025.109323","url":null,"abstract":"<div><div>Coastal flooding, driven by extreme sea levels, is a significant threat to the coastline of the United Kingdom. The primary contribution to extreme sea levels is the combination of tide and surge and understanding how these components interact is critical to assessing extreme sea levels at the coast. Here, we analyse the interactions of skew surge and tidal high water, non-tidal residual and tidal phase, and non-tidal residual and tidal level using the entire observational tide gauge network of the UK, a near 500-year model, and a model run of 2013/14 with an artificially adjusted forcing to examine how storm arrival time impacts these interactions. We show that the levels of tide-surge interaction at most sites are relatively insensitive to the magnitude of the extreme value threshold and the declustering window size. Measured data show greater levels of interaction than modelled data and although there is little interaction between skew surge and tidal high water, there are sizeable tide-surge interactions between the non-tidal residual and the astronomical tide, the largest being for tidal phase. Around the UK, extreme non-tidal residuals generally occur favourably between 1 and 5 h before tidal high water and at tidal levels that are at, or below, the average tidal level. When storm arrival time is artificially shifted, the overall change in interaction around the UK is relatively small, with skew surge and non-tidal residual maxima occurring at similar respective tidal high waters, tidal phases, and tidal levels, although variation is seen on smaller spatial scales. Our findings advance the understanding of non-linear tide-surge interactions around the UK, which is essential for the accurate estimation of extreme sea level probabilities and thus the defence of the coastline against coastal flooding.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"321 ","pages":"Article 109323"},"PeriodicalIF":2.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936875","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}
Agnese Baldoni , Carlo Lorenzoni , Allison M. Penko , Matteo Postacchini , Lorenzo Melito , David Scaradozzi , Maurizio Brocchini
{"title":"Munitions mobility and burial in a microtidal estuary","authors":"Agnese Baldoni , Carlo Lorenzoni , Allison M. Penko , Matteo Postacchini , Lorenzo Melito , David Scaradozzi , Maurizio Brocchini","doi":"10.1016/j.ecss.2025.109297","DOIUrl":"10.1016/j.ecss.2025.109297","url":null,"abstract":"<div><div>Field tests were performed to observe mobility and burial of underwater unexploded ordnances (UXOs) in a microtidal estuary, characterized by multiple forcings and mixed sediments. Such characteristics distinguish the site from others usually studied in the literature, making the analysis very complex. Observations highlighted the large dependence of UXO behavior on the bed sediments. UXOs placed on the muddy riverbed got buried almost instantaneously, without moving. Just the smallest and least dense UXO experienced some migration (maximum 10 m) and re-exposure episodes. On the other hand, UXOs remained proud on the sandy seabed, until a wave storm produced bed fluidization that caused their complete burial. Field observations, together with data collected by an integrated monitoring system operating in the study area, provided a baseline dataset for the validation of predictive models of UXO motion. The Underwater Munitions Expert System (UnMES), forced with Delft3D hydro-morphodynamic results, was run to simulate the behavior of light, medium, and heavy UXO types during a sea storm. Results agreed well with observations, predicting complete burial and minimal migration (0–5 m).</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109297"},"PeriodicalIF":2.6,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895248","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}
D.R. Mackenzie , D.R. Tait , J. Sippo , A. Ferguson , Rao S , C. Ralph , B. Stewart , M. Call , M. Reading , M. Andskog , D. Laicher-Edwards , D.T. Maher
{"title":"A novel control volume methodology to constrain ecosystem nutrient cycling within a tidal freshwater river","authors":"D.R. Mackenzie , D.R. Tait , J. Sippo , A. Ferguson , Rao S , C. Ralph , B. Stewart , M. Call , M. Reading , M. Andskog , D. Laicher-Edwards , D.T. Maher","doi":"10.1016/j.ecss.2025.109320","DOIUrl":"10.1016/j.ecss.2025.109320","url":null,"abstract":"<div><div>Tidal freshwater systems are dynamic biogeochemical hotspots that play a crucial role in nutrient cycling and the attenuation of catchment derived material. Traditional biogeochemical analysis typically relies on estimation techniques such as interpolation, regression, and remote sensing based on limited data sets, which can result in significant uncertainties. This study applies a novel sampling approach to a tidal freshwater system located on the far northeast coast of New South Wales, Australia, to quantify nutrient fluxes within a “control volume” (CV) by combining high-resolution discrete time series and hydrodynamic measurements in combination with a traditional benthic flux methodology. The study found high NH<sub>4</sub> consumption and high NO<sub>x</sub> production reflective of nitrification within the aerobic water column. The total oxygen demand within the control volume was very close to the aggregate of the sediment oxygen demand and nitrification oxygen demand, highlighting the importance of sediment biogeochemical processes within the TFZ. Control volume NOx consumption and P release were orders of magnitude larger than those obtained from traditional sediment core incubations, suggesting that NOx and P dynamics in the Richmond River TFZ are driven by processes other than sediment dynamics and/or sediment incubations underestimated in situ fluxes.</div><div>The novel control volume methodology offers a high-resolution sampling technique with fewer sampling artifacts and an enhanced understanding of biogeochemical trends over the tidal and diel cycles. By integrating biogeochemical measurements with hydrodynamic processes, this method effectively constrain nutrient cycling within a defined reach, providing detailed insights into nutrient processing during the measurement period.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109320"},"PeriodicalIF":2.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874114","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}