Estuarine Coastal and Shelf Science最新文献

{"title":"Influence of seasonality on the toxicity and metals bioavailability after the resuspension of sediments from a tropical estuary","authors":"Christiane do Nascimento Monte ,&nbsp;Ana Paula de Castro Rodrigues ,&nbsp;Bruno Galvão de Campos ,&nbsp;Lucas Buruaem Moreira ,&nbsp;Beatriz Grebbe ,&nbsp;Guacira de Figueiredo Eufrasio Pauly ,&nbsp;Ana Carolina Feitosa Cruz ,&nbsp;Lílian Irene Dias da Silva ,&nbsp;Renato Campello Cordeiro ,&nbsp;Denis Moledo de Souza Abessa ,&nbsp;Wilson Machado","doi":"10.1016/j.ecss.2025.109167","DOIUrl":"10.1016/j.ecss.2025.109167","url":null,"abstract":"<div><div>The resuspension of polluted sediments often transfers contaminants to the water column, but the potential alterations in deposited bottom sediments remain overlooked. Guanabara Bay (GB) is a tropical estuary highly polluted by multiple sources and contaminants. This study aimed to assess possible changes of toxicity and metal pollutant retention capacity of GB sediments after resuspension, at 1h and 24h after resuspension. Sediments were collected from the Niterói Harbor (NH), Meriti River (MR), Iguaçu River (IR), Rio de Janeiro Harbor (RJH), and Guapimirim Protection Area (Guapi) in winter and summer. Whole sediment toxicity on the fecundity of <em>Nitokra</em> sp. was lower in the Guapi, while IR and RJH were the most toxic. Effects on the sediment-water interface were assessed by embryo-larval development of <em>Echinometra lucunter</em>, with higher toxicity occurring in samples from MR and RJH after resuspension, showing that resuspension increases toxicity. Resuspension increased toxicity in the sediment and water, demonstrating the paramount importance of performing ecotoxicological characterization in different periods. Furthermore, proper management of dredged materials will benefit from predictions of toxicity changes related to seasonal variability.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"315 ","pages":"Article 109167"},"PeriodicalIF":2.6,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143226650","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":"Comparisons between tropical and temperate estuarine ichthyofaunas of western Africa and eastern South America","authors":"Alan K. Whitfield ,&nbsp;Mario Barletta ,&nbsp;Trevor D. Harrison","doi":"10.1016/j.ecss.2024.109088","DOIUrl":"10.1016/j.ecss.2024.109088","url":null,"abstract":"<div><div>This review examines the probable fish colonization processes that occurred when plate tectonics and continental drift created the South Atlantic Ocean between Africa and South America, beginning in the Late Jurassic and gaining considerable momentum during the Cretaceous. Initial fish colonization is likely to have occurred by tropical fish families utilizing the western Tethys Sea arm around North Africa to gain access to the growing epicontinental seaways and coastal zones between Africa and South America. Speciation by some of these taxa would then have occurred such that the southern temperate waters on both continents became occupied by a less species rich cool-water ichthyofauna. The current numerical family status for African and South American tropical estuarine ecoregions is 55 and 63 respectively, whereas the numerical status for temperate ecoregions is 32 and 36 respectively. A Bray-Curtis similarity matrix was created for both fish families and species from the selected tropical and temperate ecoregions. These cluster analyses showed that fish families on either side of the Atlantic were similar but that the species were not. Only a very limited number of mainly large teleosts (e.g. <em>Megalops atlanticus</em>) and elasmobranchs (e.g. <em>Carcharinus leucas</em>) occur on both sides of the Atlantic. The current large crossing distances of &gt;3000 km for most tropical coastlines, and &gt;6000 km for some of the temperate coastlines, restrict fish species transfers across this large oceanic basin.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"313 ","pages":"Article 109088"},"PeriodicalIF":2.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149768","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":"Sediment to atmosphere CO2 efflux increases at retreating salt marsh edges","authors":"Lea M. Stolpmann ,&nbsp;Thorsten Balke ,&nbsp;Adrian M. Bass","doi":"10.1016/j.ecss.2025.109129","DOIUrl":"10.1016/j.ecss.2025.109129","url":null,"abstract":"<div><div>Coastal intertidal wetlands are dynamic and biodiverse habitats with carbon-rich waterlogged soils. When the soil gets exposed to oxygen, carbon can be emitted as CO₂ back into the atmosphere. In this study we investigate whether contrasting stepped vs. gradual marsh edge topography, resulting from lateral cliff erosion versus expansion influences the soil-atmosphere CO₂ fluxes. CO₂ fluxes were quantified alongside groundwater level, soil temperature, and local sediment grain size across an estuarine salt marsh with differing seaward edge topography. We found that the CO₂ flux from the marsh soil was on average greater at cliffed-eroding compared to sloped-prograding sites, 1.11 ± 0.77 g/m² hr⁻¹ and 0.88 ± 0.74 g/m² hr⁻¹, respectively. The presented CO₂ emissions from the soil to the atmosphere consider the static morphology, i.e., the fluxes from the soil as it sits in place during the respective measurement. Soil respiration varied temporally with tidal cycle, groundwater levels, soil temperature, and spatially with distance to the seaward vegetation edge. Overall, fluxes during a neap cycle were significantly larger compared to spring tidal cycles. Our study thus highlights that soil CO₂ efflux is affected by marsh topography resulting from cliff formation and marsh edge undercutting. The eroding and prograding sites differed in their site characteristics related to groundwater level, grain size and soil temperature, influencing the soil to atmosphere CO₂ flux from the remaining marsh platform. Our findings highlight the spatial and temporal variability of carbon fluxes in a salt marsh environment and the importance of geomorphic form and process in understanding coastal carbon dynamics.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"313 ","pages":"Article 109129"},"PeriodicalIF":2.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150519","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}

{"title":"Predicting predator abundance from prey in estuaries: Insights from single and joint species distribution modeling","authors":"Sally Dowd ,&nbsp;Sarah M. Roberts ,&nbsp;Nathan M. Bacheler ,&nbsp;Janet A. Nye","doi":"10.1016/j.ecss.2024.109083","DOIUrl":"10.1016/j.ecss.2024.109083","url":null,"abstract":"<div><div>Species occurrence and abundance is determined by both abiotic and biotic factors. Yet, species distribution models (SDMs) that rely on species-environment responses to form inferences about and predictions for species of interest, often ignore the effect of prey on predator distribution. There has been recent effort to consider these effects and advance SDMs particularly through the use of spatiotemporal models. However, these models have not been tested extensively in estuarine systems. We used fisheries-independent data to understand if prey abundance helps explain red drum, southern kingfish and black drum abundance in addition to the environment in a North Carolina estuarine system. We modeled these predators of blue crabs due to the decline in blue crab populations in North Carolina, once constituting the most lucrative fishery in the state. The distribution of all three predators was best explained by abiotic variables alongside either blue crab or total prey abundance. We tested the ability of two modeling approaches, single SDMs and joint SDMs, to make inferences and predictions of predator distribution. By comparing modeling types with different combinations of abiotic variables, total prey abundance, and blue crab abundance, we found consistency in the best fit model across modeling approaches for two of the three predators. Single SDMs often outperformed joint SDMs when predicting abundance. As our joint SDM approach leveraged conditional prediction, we asked if an increase in spatial resolution and prey information improved predictive performance. Although there was a slight improvement as more observations were included, joint models still provided weak predictions. With the advance of novel modeling techniques, we must consider tradeoffs between model choice, covariate selection, spatial scale, and data types.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"313 ","pages":"Article 109083"},"PeriodicalIF":2.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143151157","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":"Unique characteristics and spatiotemporal variations of dissolved organic matter along the Yeongsan River estuary impacted by an estuary dam","authors":"Meilian Chen ,&nbsp;Suhyeon Jang ,&nbsp;Kyung-Hoon Shin ,&nbsp;Haeseong Oh ,&nbsp;Min-Seob Kim ,&nbsp;Jin Hur","doi":"10.1016/j.ecss.2024.109081","DOIUrl":"10.1016/j.ecss.2024.109081","url":null,"abstract":"<div><div>Artificial barriers such as dams and weirs profoundly affect the hydrological conditions of aquatic ecosystems and organic carbon dynamics. This study examines the sources, characteristics, and spatial and seasonal variations in dissolved organic matter (DOM) in the Yeongsan River estuary, South Korea, impacted by an estuary dam. We explore how these barriers influence DOM concentrations and compositions seasonally. Observations from five sites (YR1 to YR5) revealed high levels of fluorescence index (FI, 1.7–1.9), biopolymer fraction (2–16%), and percentage of dissolved organic sulfur (DOS%, up to 42%), indicating a dominant algal contribution. The dam's installation disrupted the DOM continuum, distinguishing between upstream sites with terrestrial DOM and downstream sites influenced by marine sources. Compared to downstream sites, upstream sites consistently showed higher dissolved organic carbon (DOC) and absorption at 254 nm (a₂₅₄), with depleted δ¹³C-DOC across all seasons. Seasonal differences included higher concentrations of humic substances and biopolymers in upstream sites during spring, with pronounced protein-like fluorescence. During the monsoon, these sites had enhanced humic substances, biopolymers, low molecular weight neutrals, and peak N fluorescence associated with chlorophyll intensity. The dam controlled freshwater discharge to downstream sites, especially during peak monsoon. Stable isotopic values (δ¹³C-DOC) confirmed distinct DOM sources between upstream and downstream sites. Notably, only the middle site (YR3) displayed unique characteristics in the pre-monsoon season, indicating the monsoon's residual impact on DOM. The lower estuary likely experiences extended water residence times post-monsoon. This study underscores the significant influence of phytoplankton blooms and distinct spatiotemporal variations in DOM characteristics in an estuarine system disrupted by artificial barriers.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"313 ","pages":"Article 109081"},"PeriodicalIF":2.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143151232","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":"Ecological uniqueness of fish assemblages in tropical estuarine and coastal systems: Assessing environmental and spatial drivers","authors":"Rafael L. Oliveira ,&nbsp;Ellen M. Camara ,&nbsp;Mario V. Condini ,&nbsp;Ronaldo R. Oliveira-Filho ,&nbsp;Helen A. Pichler ,&nbsp;Ryan Andrades ,&nbsp;Ciro C. Vilar ,&nbsp;Henry L. Spach ,&nbsp;Jean-Christophe Joyeux ,&nbsp;Mauricio Hostim-Silva","doi":"10.1016/j.ecss.2024.109111","DOIUrl":"10.1016/j.ecss.2024.109111","url":null,"abstract":"<div><div>We assessed the local and species contributions to beta diversity, as well as its relationships with environmental and spatial drivers along the eastern Brazilian coast. Using abundance-based indices, total beta diversity was partitioned into “Local Contribution to Beta Diversity” (LCBD) and “Species Contribution to Beta Diversity” (SCBD) components at two levels (estuarine-coastal systems; estuarine and coastal areas). Furthermore, we evaluated the relationships between LCBD values and local environmental conditions and spatial structures, in addition to fish assemblage metrics. Our results indicated that LCBD values were higher in the estuarine areas compared to their adjacent coastal areas and primarily associated with lower salinity and depth, and higher temperatures. Spatial effects were indicative of higher local uniqueness related to unmeasured large-scale processes. Sites with higher species diversity and lower dominance had higher LCBD, while species richness had slight positive influence on LCBD at both levels. The contributions of species varied within and between levels, but the highest SCBD values were supported primarily by common and dominant species. Our study highlights the importance of the environmental conditions provided by estuarine areas for the overall variation of fish assemblages.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"313 ","pages":"Article 109111"},"PeriodicalIF":2.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143151346","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":"Shifts in marsh erosion, migration, and wave exposure over nearly two centuries of sea-level rise in the Gulf of Mexico","authors":"Kathryn E.L. Smith ,&nbsp;Joseph F. Terrano ,&nbsp;Robert L. Jenkins ,&nbsp;Jonathan L. Pitchford ,&nbsp;Davina L. Passeri ,&nbsp;Christopher G. Smith","doi":"10.1016/j.ecss.2024.109106","DOIUrl":"10.1016/j.ecss.2024.109106","url":null,"abstract":"<div><div>Coastal wetlands are economically important ecosystems, but are at risk to erosion from waves, storms, and sea level rise. However, marshes can persist under rising sea level through vertical accretion and migration into adjacent higher-elevation habitats. We measured rates of marsh shoreline change and migration and compared the results for historical and modern periods in a largely undeveloped and marine-dominated estuary within the Mississippi-Alabama coast of the Northern Gulf of Mexico. Mean shoreline change rate for the modern (post-1957) period was higher than historical rates (pre-1957) at −1.55 ± 0.11 m yr⁻¹ and -0.84 ± 0.07 m yr⁻¹, respectively. Shoreline change rates were highest in regions where exposure to wind-driven waves increased due to barrier island migration and land loss. Marsh migration (modern 1.25 ± 0.37 m yr⁻¹ and historical 1.01 ± 0.13 m yr⁻¹) occurred at similar rates as shoreline erosion except for the highest erosive shorelines, leading to an overall 15% marsh loss. Upland-to-marsh conversion occurred in forested areas and may have been encouraged by changes in management practices. In the Grand Bay estuary, our data show that marsh migration is not occurring at sufficient rates to compensate for marsh loss, resulting in overall loss in marsh habitat. Overall, migration may allow marsh to persist under rising sea levels but can lead to an overall reduction in forested or freshwater habitats if steep slopes or other barriers prevent their migration.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"313 ","pages":"Article 109106"},"PeriodicalIF":2.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143151348","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}

{"title":"Patterns and mechanisms of wetland change in the Breton sound estuary, Mississippi River delta: A review","authors":"John Day ,&nbsp;Robert Lane ,&nbsp;Matt Moerschbaecher ,&nbsp;H.C. Clark ,&nbsp;Mead Allison ,&nbsp;Ehab Meselhe ,&nbsp;Alexander S. Kolker ,&nbsp;Rachael Hunter ,&nbsp;Paul Kemp ,&nbsp;Jae-Young Ko ,&nbsp;Robert Twilley ,&nbsp;John R. White ,&nbsp;Ron DeLaune ,&nbsp;Jessica R. Stephens ,&nbsp;Camille Chenevert ,&nbsp;Emily Fucile Sanchez ,&nbsp;Disha Sinha","doi":"10.1016/j.ecss.2024.109065","DOIUrl":"10.1016/j.ecss.2024.109065","url":null,"abstract":"<div><div>The Breton Sound Estuary, located within the Mississippi River Delta, has experienced significant wetland loss over the past century due to a combination of natural and anthropogenic factors. This study examines the patterns and mechanisms driving wetland change in the upper Breton Sound Basin and focuses on the impacts of riverine isolation, hydrological alterations, and human activities. Prior to human interventions, the basin received regular large riverine input via overbank flooding and crevasse channels. Levee construction began in the 18th century, but it wasn't until the great Mississippi River flood of 1927 that continuous levees were built that completely isolated the river from the upper Breton Sound Basin. The reduction of riverine input led to replacement of fresh and low salinity marshes by more salt-tolerant species. Sediment introduced during this single 1927 event created a 130 km² crevasse splay still visible in marsh cores more than 10 km from the levee breach. Higher levees built afterward as part of the Mississippi River and Tributaries Project (MR&amp;T) have almost completely isolated this basin from the river. A small river diversion was constructed in 1991 to divert river water into the basin, but its impact has been minimal compared to the historical crevasse channels. Starting in the 1970s, wetlands in the upper basin began to deteriorate and was dramatic during the passage of Hurricanes Katrina and Rita in 2005, and wetland loss was much higher in some areas. For example, some wetlands in the path of diverted water had loss rates of about 7% per year during the passage of the hurricanes compared to &lt;1% per year for most of the rest of the upper basin. Here we describe patterns of wetland change and analyze factors responsible for the loss. There have been pervasive changes in hydrology of the upper Breton Sound Basin due to flood control levees. But dredging of an extensive canal network is mostly responsible for the majority of wetland loss in the central part of the upper basin. Marshes facing the open waters of Breton Sound had low loss rates and receive sediments and nutrients from resuspended seafloor materials and Mississippi River water discharged to open waters of Breton Sound. Nutrients played a negligible role in causing wetland loss. Sediment introduction is likely the most effective restoration strategy for mitigating further wetland loss, and specific recommendations are provided that are tailored to the unique conditions of different zones within the Basin. Understanding the complex interplay of factors influencing wetland dynamics in the Breton Sound Estuary is crucial for developing effective restoration and management strategies in the face of ongoing environmental changes.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"313 ","pages":"Article 109065"},"PeriodicalIF":2.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149740","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":"Spatial and temporal variation in benthic foraminiferal assemblages record history of human activities within the Matagorda Bay system","authors":"Paige P. Klug ,&nbsp;Christina L. Belanger ,&nbsp;Timothy Dellapenna ,&nbsp;Yoonho Jung ,&nbsp;Anna M. Mozisek ,&nbsp;Zachary Clore ,&nbsp;Peng Lin ,&nbsp;Wei Xing ,&nbsp;Danielle Fehrenbach ,&nbsp;J.T. Bowling ,&nbsp;Gael Ndi Nkwain","doi":"10.1016/j.ecss.2024.109117","DOIUrl":"10.1016/j.ecss.2024.109117","url":null,"abstract":"<div><div>The spatial variability of estuarine ecosystems poses challenges to ecosystem health assessment and makes remediation efforts costly and time-consuming. Benthic foraminiferal fossils preserved in estuarine sediments record past environmental conditions and can be used to assess spatial variability in ecosystem changes across an estuary through time. Here we use changes in the faunal composition and ecological structure of benthic foraminiferal faunas from 6 sediment cores from estuarine settings surrounding Matagorda Bay, Texas to assess the spatial variability of environmental changes over the last ∼400 years. Since ∼1950 CE, when human populations and industrial activity increased in the region, the richness and evenness of benthic foraminiferal assemblages decreased across the bay. The relative abundance of stress-tolerant taxa, such as <em>Ammonia</em> spp., also increased toward the present at all sites. However, the magnitude of change at each site varies and the specific changes in faunal composition reflect spatial differences in the intensity of environmental changes with sites close to protected areas changing less than sites close to point sources of pollution suggesting that benthic foraminifera can record local changes within a single estuary. However, benthic foraminiferal assemblages became more similar among sites after the intensification of human activities, suggesting increased stress is leading to faunal homogenization across the Matagorda Bay system.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"313 ","pages":"Article 109117"},"PeriodicalIF":2.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150304","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":"To change or not to change: Macrozoobenthic community variation versus persistence in Tortolì lagoon (Sardinia, Italy)","authors":"Jacopo Giampaoletti ,&nbsp;Simone Galli ,&nbsp;Maria Flavia Gravina ,&nbsp;Paolo Magni ,&nbsp;Alice Sbrana","doi":"10.1016/j.ecss.2024.109067","DOIUrl":"10.1016/j.ecss.2024.109067","url":null,"abstract":"<div><div>In the framework of the complexity of transitional ecosystem dynamics, which strongly drive ecological processes and their effects on communities and ecosystem functioning, the seasonal changes in 2021 of macrobenthic community were analysed at four sites of the Tortolì lagoon (Sardinian, Italy), which were characterised in terms of temperature, salinity, organic matter content of sediment and dissolved oxygen. Two macrobenthic community conditions separated by 20 years, between 2003 and 2021, were also compared. Both the composition of the community in terms of species and the main functional traits, related to the relationship with the sediment, feeding mode and development type, were investigated. The objective was to identify which aspects (species composition/functional species traits) of the benthic community are most responsible for changes on an annual and multi-year scale, and which persist two decades later. The benthic assemblage was extraordinarily rich in species (86 species in 2021 and 124 species in total over the two years). Most of species were typical of coastal sheltered waters and properly marine, while opportunistic and brackish/halolimnobic species were scarce; two alien Isopods (<em>Paracerceis sculpta</em>, <em>Mesanthura</em> sp.) and the new record of Enteropneusta (<em>Glossobalanus minutus</em>) were also reported. Differences between seasons and sampling sites resulted significant sources of variation and marine species mainly contributed to discriminate sites closer to the sea, while the others were especially distributed in the confined sites. The comparison between 2003 and 2021 highlighted that the species richness remained high in the two periods, but significant changes in the species composition of the benthic community, explained in terms of a 50 % species turnover rate. This was attributed to different dispersal modes, which proved that new colonisers arrived in the lagoon from the adjacent marine area by active (via larvae) and passive (adult rafting, human-mediated activities) means. The persistence in terms of functional group composition and diversity of the macrobenthic community after twenty years was also evidenced. The considerable diversification of functional groups in the benthic food web, together with the high level of species richness and taxonomic diversity, is assumed to be indicative of an efficient degree of ecosystem functioning of the Tortolì lagoon 20 years later.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"313 ","pages":"Article 109067"},"PeriodicalIF":2.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150723","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}