Estuarine Coastal and Shelf Science最新文献

{"title":"Rare earth elements and neodymium isotopes in dissolved and particulate phases in the Cam River andNam Trieu Estuary, north Vietnam","authors":"Viet Quoc Pham ,&nbsp;Vu Duy Vinh ,&nbsp;Sylvain Ouillon ,&nbsp;Van Tu Vu ,&nbsp;Nguyen Thi Hue ,&nbsp;Dinh Hai Ngoc ,&nbsp;Xuan Tien Dau ,&nbsp;Moustafa Belhadj ,&nbsp;Catherine Jeandel","doi":"10.1016/j.ecss.2025.109248","DOIUrl":"10.1016/j.ecss.2025.109248","url":null,"abstract":"<div><div>Dissolved and particulate rare earth elements (REE) were measured in the Cam-Nam Trieu estuary (north Vietnam) to trace land inputs to the ocean and particulate-dissolved phase interactions. This work discusses REE measurements in 19 samples based on the analysis of three phases (dissolved, labile, and refractory) using a quadrispike method. Dissolved REE (dREE) concentrations ranged from 1.16 to 14.7 nmol/kg, while particulate REE concentrations (pREE, including labile and refractory fractions) ranged from 24.6 to 104.6 nmol/kg. In the solid phase, light REEs (LREE) were most abundant (up to 85 % of total REE content), followed by middle REEs (MREE), with heavy REEs (HREE) representing less than 15 %. Calculated anomalies of Ce, Eu, and Gd indicated minimal fractionation. Surprisingly, no significant trace of anthropogenic Gd was detected in this estuary. Neodymium isotopic composition analysis revealed no change in isotopic signals during particle transport from the midstream part of the riverto the estuary. The isotopic signatures of the dissolved and labile values were more radiogenic (<span><math><mrow><msub><mi>ε</mi><mrow><mi>N</mi><mi>d</mi></mrow></msub></mrow></math></span> = −10.9 ± 0.3) than those of the refractory fraction (<span><math><mrow><msub><mi>ε</mi><mrow><mi>N</mi><mi>d</mi></mrow></msub></mrow></math></span> = −12.5 ± 0.4).</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"319 ","pages":"Article 109248"},"PeriodicalIF":2.6,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685900","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":"Stomach content analysis: Comparison amongst different sources of sampling in the study of the diet of sea lions in Argentina","authors":"Ana Harrington ,&nbsp;Gustavo A. Daneri ,&nbsp;Esperanza A. Varela ,&nbsp;Adriana Farias ,&nbsp;Mariana Descalzo ,&nbsp;Alejandra V. Volpedo","doi":"10.1016/j.ecss.2025.109246","DOIUrl":"10.1016/j.ecss.2025.109246","url":null,"abstract":"<div><div>The South American sea lion, <em>Otaria flavescens,</em> has proven to be an excellent biological sampler of the marine biodiversity since it is possible, through the examination of its diet, to determinate the distribution and abundance of marine resources in the northern Patagonian ecosystem. There are different methods to analyze the diet of pinnipeds, such as the use of scats, stomach contents, fatty acids and stable isotopes. The aim of the present study was to compare the type of information obtained from stomach contents analysis according to different sources of sampling (1- stomach contents from animals found dead on the coast, 2- natural regurgitations and 3- stomach lavage of previously anesthetized individuals). Between 2005 and 2022 a total of 48 stomach contents of <em>O. flavescens</em> were obtained at the sea lions rookeries of Punta Bermeja (41°09′S, 63°05′ W), Promontorio Belén (41° 09′S; 63° 48′W) and Caleta de los Loros (41°02′ S 64°10′ W) (San Matías gulf, Argentina). These three sources of sampling provided different dietary information. Stomach contents from dead animals presented more diverse prey than those coming from the two other sources. Overall, the fish species <em>Raneya brasiliensis</em> was the main prey item found, followed by cephalopods and crustaceans, coinciding with previous dietary reports based on scat analysis. The results obtained suggest that scat analysis is still the most appropriate method for monitoring the diet of sea lions on a temporal and spatial basis, being stomach content analysis a good complementary source of information.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"318 ","pages":"Article 109246"},"PeriodicalIF":2.6,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629060","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":"Ontogenic shift of feeding habit in Manila clam Ruditapes philippinarum after settlement revealed by diatom specific DNA-metabarcoding diet analysis","authors":"Shouji Houki,&nbsp;Mana Ozaki ,&nbsp;Natsumi Sano","doi":"10.1016/j.ecss.2025.109244","DOIUrl":"10.1016/j.ecss.2025.109244","url":null,"abstract":"<div><div>Clarifying the feeding ecology of each life stage of the Manila clam is essential for an accurate assessment of the food environment for this species. However, information on the feeding habit of clams remains insufficient, and also the morphological and ecological characteristics of the diverse microalgal species in the coastal zone on which clams feed remains largely unknown. In this study, we investigated the ontogenic change in feeding habit of clams in natural waters based on chloroplast-targeting DNA metabarcoding. Samples of clams (spats, juveniles, adults), seawater and sediment were collected in three regions in Japan. DNA was extracted from each sample and PCR and DNA metabarcoding were performed using diatom-specific universal primers for chloroplasts (rbcL), after comparison with the universal primer for microalgae (psbA). Then, we calculated compositions of diatom genera in each sample, proportions of planktonic and benthic diatoms in gut contents of clams and similarities of diatom genera compositions between each sample. High proportions of benthic diatoms tended to be detected from spats and small juveniles with a shell length less than 2 mm. On the other hand, high proportions of planktonic diatoms were detected from gut contents of juveniles and adults with a shell length greater than 8 mm, and their composition was similar to that of diatoms in the ambient seawater. This diet shift may be attributed to the developmental completion of the inhalant siphon for filter-feeding at around 2 mm in shell length. From these results, the life history stages of the Manila clam after settlement can be divide into three phases: pedal-feeding phase from the settlement to 2 mm shell length, transition phase from 2 to 8 mm and filter-feeding phase larger than 8 mm.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"319 ","pages":"Article 109244"},"PeriodicalIF":2.6,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685887","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":"Impact of duck predation on the population of Manila clam (Ruditapes philippinarum) in tidal flat","authors":"Rikuto Honda ,&nbsp;Takehisa Yamakita ,&nbsp;Tatsuya Ozaki ,&nbsp;Nana Yamashita ,&nbsp;Tomohiro Komorita","doi":"10.1016/j.ecss.2025.109247","DOIUrl":"10.1016/j.ecss.2025.109247","url":null,"abstract":"<div><div>Ducks such as mallards (<em>Anas platyrhynchos</em>), have been the target of predation control, including extermination efforts, on land and in coastal regions, because they fly in colonies and prey on a wide variety of agricultural crops and marine products, including Manila clams (<em>Ruditapes philippinarum</em>). To date, stomach content analysis and behavioral observations have primarily been used to assess duck predation on clams. Although ducks appear to respond to water depth, their response to short-term changes in water depth (i.e., tidal height) has not been assessed in tidal flats. Therefore, a quantitative evaluation of the effects of duck predation on clams is needed to clarify the behavior of ducks on tidal flats and to conserve ducks and clams. In this study, the influence of duck predation on the clam population was investigated using anti-predation experiments on the Midorikawa River tidal flat in Ariake Bay, Kyushu, Japan. Furthermore, the relationships among water depth, duck activity, and duck flock density were investigated using a trail camera and a drone. In the anti-predation experiment during the study period, no significant difference in clam density was found between the experimental and control clam density. This study showed that duck predation may have a small impact on the Manila clam population in the tidal flats of the Midorikawa River.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"318 ","pages":"Article 109247"},"PeriodicalIF":2.6,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644538","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":"Contrasting beta-diversity patterns of temperate coastal fish species and their functional traits","authors":"Richard Zavalas ,&nbsp;Alex Rattray ,&nbsp;Jacquomo Monk ,&nbsp;Euan Harvey ,&nbsp;Christopher Henderson ,&nbsp;Daniel Ierodiaconou","doi":"10.1016/j.ecss.2025.109245","DOIUrl":"10.1016/j.ecss.2025.109245","url":null,"abstract":"<div><div>Useful measurements of biodiversity for the purpose of conservation planning are dependent on describing appropriate biological characteristics of assemblages at a representative spatial scale. Defining ecological connectivity and composition over the extents of a management region can provide insights on the spatial ecology of assemblages intended for protection. Here we investigated the biogeographic patterns in both taxonomic and functional beta-diversity of fish assemblages from two depth strata (infralittoral and circalittoral reefs) across 800 km of exposed coastline on the south-east Australian continental margin, including six no-take marine protected areas. A general increase in both functional and taxonomic beta-diversity from west to east was observed using a null modelling approach. Notably, patterns in functional beta-diversity were largely attributed to the nestedness component of beta-diversity between sites in contrast with taxonomic beta-diversity which showed patterns related mostly to species turnover. Defining functional and species beta-diversity of marine fish revealed these metrics did not always follow analogous patterns, despite the ecological niche similarities in the assemblages sampled across sites. This investigation of functional and taxonomic diversity can inform the inherent ecological resilience of assemblages across differing bio-regional scales. Furthermore, the application provides a unique and comparable representation of functional and taxonomic characteristics using existing biological datasets.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"319 ","pages":"Article 109245"},"PeriodicalIF":2.6,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685897","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":"Contribution of different bacterial groups in the carbon flow through the microbial food web","authors":"Danijela Šantić ,&nbsp;Iva Stojan ,&nbsp;Ana Vrdoljak Tomaš ,&nbsp;Blanka Milić Roje ,&nbsp;Izabela Mujakić ,&nbsp;Cristian Villena-Alemany ,&nbsp;Michal Koblížek ,&nbsp;Slaven Jozić ,&nbsp;Mladen Šolić ,&nbsp;Stefanija Šestanović","doi":"10.1016/j.ecss.2025.109228","DOIUrl":"10.1016/j.ecss.2025.109228","url":null,"abstract":"<div><div>Bacteria greatly contributes to the transfer of dissolved organic carbon to the upper trophic levels. Nevertheless, little is known about the contribution of specific bacterial groups. Here, we conducted three seasonal experiments (both, microcosm and mesocosm) in the coastal area of the central Adriatic with the aim of determining the contribution of selected bacterial groups to carbon flow through the microbial food web. We assessed the growth rates of four bacterial groups (Bacteroidota, SAR11, Rhodobacteraceae, and Gammaproteobacteria), as well as aerobic anoxygenic phototrophs, and their contributions to biomass production and carbon transfer to upper trophic levels. For the first time, we reported a significant contribution of aerobic anoxygenic phototrophs to the carbon flow, especially during the summer.</div><div>Under initial winter conditions, SAR11 contributed the most to bacterial biomass production, while Gammaproteobacteria were the primary contributors to grazing loss and served as the preferred prey. As temperature increased, the contribution of Gammaproteobacteria and Bacteroidota to bacterial biomass production also increased. Regarding grazing loss, SAR11 and Bacteroidota were the dominant contributors in spring, whereas Gammaproteobacteria and Rhodobacteraceae played the most significant role during summer. Under nutrient-enriched conditions, SAR11 contributed the most to both bacterial biomass production and grazing loss during winter. However, with rising temperatures, Gammaproteobacteria, Rhodobacteraceae and Bacteroidetes became the primary contributors to bacterial biomass production and Gammaproteobacteria and Bacteroidetes in grazing loss. Our estimates suggest that Gammaproteobacteria and the SAR11 clade were more significantly impacted by grazing, whereas Bacteroidota and Rhodobacteraceae were equally influenced by both nutrient availability and grazing pressure.</div><div>Therefore, the results obtained in this study are useful for evaluating the potential contributions of diverse bacterial groups to carbon cycling in marine ecosystems under changing environmental conditions, particularly during shifts in seawater temperature. We further analyzed the dynamics of bacterial community composition in relation to varying environmental factors.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"318 ","pages":"Article 109228"},"PeriodicalIF":2.6,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611617","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":"Impact of storm surge and power peaking on tidal-fluvial processes in microtidal Neretva River estuary","authors":"Nino Krvavica ,&nbsp;Marta Marija Gržić ,&nbsp;Silvia Innocenti ,&nbsp;Pascal Matte","doi":"10.1016/j.ecss.2025.109227","DOIUrl":"10.1016/j.ecss.2025.109227","url":null,"abstract":"<div><div>This study investigates the interactions between tides, storm surge, river flow, and power peaking in the microtidal Neretva River estuary, Croatia. Based on the existing NS_Tide tool, the study proposes a new non-stationary harmonic model adapted for microtidal conditions, which incorporates linear storm surge, as well as linear and quadratic river discharge terms. This model enhances the NS_Tide’s ability to accurately predict water levels from tide-dominated sections downstream to discharge-dominated areas upstream. River discharge was identified as the dominant factor for predicting stage levels at most stations, while the influence of storm surge, though consistent, decreased upstream. Strong tide-river interactions were observed throughout the study domain, with the stationary tidal component consistently contributing to water level fluctuations at all location and minimal influence from the tide-surge interaction component. Simulations using the STREAM numerical model were also used to isolate the variability in water levels caused by power peaking. These simulations demonstrated that high-frequency discharge fluctuations due to hydropower plant operations amplify the <span><math><msub><mrow><mi>S</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span> constituent in upstream river sections and modulate the amplitudes of other tidal constituents in the estuarine and tidal river sections. The proposed method proved highly effective in the microtidal context of the Neretva River and shows potential for adaptation to mesotidal and macrotidal systems.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"318 ","pages":"Article 109227"},"PeriodicalIF":2.6,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143621489","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":"Estimating primary production in the California Current System using machine learning methods","authors":"Zixu Ye ,&nbsp;Lingling Jiang ,&nbsp;Qianru Wang ,&nbsp;Qiang Li ,&nbsp;Lin Wang ,&nbsp;Siwen Gao ,&nbsp;Zhigang Jiang","doi":"10.1016/j.ecss.2025.109243","DOIUrl":"10.1016/j.ecss.2025.109243","url":null,"abstract":"<div><div>Primary Production (PP) is a key indicator for assessing the photosynthetic rate of marine phytoplankton. Over the past 40 years, models for estimating PP using remote sensing technology have been continuously developed. While these models have achieved high accuracy in open oceans, their performance in optically complex coastal regions remains limited. With an attempt to develop accurate and robust PP models for coastal environments from satellite measurements, this study aimed to explore machine learning (ML) methods in satellite retrieval of PP values. The California Current System (CCS), one of the world's four largest eastern boundary current systems, has abundant in-situ measurements of PP. Combining these data with remote sensing data, we developed multi-parameter fusion ML algorithms and conducted a comparative analysis with three other PP models. The results indicated that the ML model exhibited high applicability in the remote sensing inversion of PP. The inversion accuracy of the ML model (average <em>RMSE</em>: 266.3 mgC·m⁻²·d⁻¹, average <em>MAPD</em>: 49.9%, average <em>Bias</em>: 3.2 mgC·m⁻²·d⁻¹) outperformed PP models (average <em>RMSE</em>: 1127.0 mgC·m⁻²·d⁻¹, average <em>MAPD</em>: 151.6%, average <em>Bias</em>: 471.6 mgC·m⁻²·d⁻¹). The XGBoost model improves the inversion accuracy of PP in coastal waters more accurately than other models. Based on this model, we analyzed the spatio-temporal distribution characteristics of PP in the CCS from 2012 to 2022. The findings showed distinct monthly distribution patterns of PP on spatial scales, with a decrease from nearshore to offshore areas. On temporal scales, there was an increase trend from February to August, followed by a decline trend until the next February. Additionally, this study further explored the relationship between variations in PP within the CCS and climatic phenomena, specifically the El Niño-Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO). The results showed that abnormal changes in sea surface temperature (SST) were negatively correlated with PP. These findings enhance the methodologies for remote sensing observations of PP and provide innovative perspectives on understanding the dynamics of marine phytoplankton.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"318 ","pages":"Article 109243"},"PeriodicalIF":2.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680952","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":"The Great Mississippi River Flood of 1927: Morphodynamic analysis of the Caernarvon crevasse event","authors":"Ahmed Khalifa ,&nbsp;Ehab Meselhe ,&nbsp;Kelin Hu ,&nbsp;John Day ,&nbsp;Mead Allison","doi":"10.1016/j.ecss.2025.109234","DOIUrl":"10.1016/j.ecss.2025.109234","url":null,"abstract":"<div><div>Wetlands in deltas across the globe have been severely affected by climate change-induced sea level rise. One strategy to mitigate these impacts is to engineer large river sediment diversions. In this study, we use a morphodynamic model to simulate and quantify the depositional footprint of the 80-day Caernarvon crevasse event that occurred during the Great Mississippi Flood of 1927 in Breton Sound Basin, Louisiana, USA, as an analog to engineered diversions. We examine the effects of river sediment load by modeling the same crevasse splay formation under the past, current-day, and future projected sediment load decline of the Lower Mississippi River. To assess the model's performance, we compared crevasse formation to field-measured deposition thickness and mass per area. The model shows that under current sediment loads, a flood discharge comparable to the 1927 event would build 70% less land was it to occur today. Further, silt falling velocity and clay flocculation percentage are the two key factors controlling splay footprint and deposition. The model also demonstrates the effects of sediment supply decline on the land-building potential of engineered sediment diversions. These sediment diversions, designed to mimic natural crevasse splay formation, are being pursued as a coastal restoration strategy in the Mississippi Delta. The analysis presented here emphasizes key attributes of engineered diversions and their relevance to the successful implementation of these restoration strategies, including flow capacity, ability to distribute sediment in the receiving area, and the extent to which they would induce marsh inundation.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"318 ","pages":"Article 109234"},"PeriodicalIF":2.6,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578087","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":"Possible processes responsible for the decline in the stock of Manila clam based on long-term observations in Banzu tidal flat","authors":"Mitsuharu Toba ,&nbsp;Yutaka Kobayashi ,&nbsp;Toshihiro Hayashi ,&nbsp;Yuji Kagami","doi":"10.1016/j.ecss.2025.109232","DOIUrl":"10.1016/j.ecss.2025.109232","url":null,"abstract":"<div><div>In this study, we conducted three surveys of the Manila clam, <em>Ruditapes philippinarum</em>, in the Banzu tidal flat, Tokyo Bay, from the late 1980s to early 2020s. The surveys included core sampling at six sites along the onshore–offshore transect line to assess density changes after settlement, fishing gear sampling at 64 sites to examine changes in clam distribution across the area, and sampling at 14 sites to monitor changes in condition index. We identified two seasonal cohorts of clams per year derived from spring and autumn spawning, which consisted of complementary and primary components, respectively, to create the next-generation clam stock. The decline in the autumn spawning cohort is a fundamental aspect of the decrease in clam stocks in Banzu. This decline was attributed to reduced survival after settlement, primarily affecting relatively large individuals with a shell length (SL) of approximately &gt;20 mm. As the autumn cohort reaches an SL of &gt;20 mm only after the summer following spawning, it is assumed that size-dependent factors affecting clams with SL &gt; 20 mm after summer were responsible for the recorded decrease in clam stocks in Banzu. Thus, the decline in Manila clam stocks can likely be attributed to mortality from energy loss associated with spawning under oligotrophic and high-temperature conditions and increased predation pressure of black porgy populations with synergistically acting reduced burrowing ability of clams because of low water salinity.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"318 ","pages":"Article 109232"},"PeriodicalIF":2.6,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578088","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}