Estuarine Coastal and Shelf Science最新文献

{"title":"Century-long coral evidence of climate and anthropogenic influences on tropical coastal phosphorus cycling in the northern South China Sea","authors":"Ning Guo ,&nbsp;Wei Jiang ,&nbsp;Kefu Yu ,&nbsp;Jian-xin Zhao ,&nbsp;Yinxian Song ,&nbsp;Yue-xing Feng ,&nbsp;Chunmei Feng","doi":"10.1016/j.ecss.2026.109720","DOIUrl":"10.1016/j.ecss.2026.109720","url":null,"abstract":"<div><div>Phosphorus (P) is a critical and scarce nutrient in marine ecosystems, playing a vital role in sustaining primary productivity. Its dynamic variations are closely linked to coastal anthropogenic activities and climate change. However, due to the lack of long-term continuous observational data, our understanding of the evolution patterns of coastal nutrients at interannual to centennial scales remains limited. Coral skeletal phosphorus-to-calcium ratio (P/Ca) has been demonstrated to be a robust proxy for reconstructing long-term phosphate variations in seawater. This study utilized P/Ca ratios in <em>Porites lutea</em> coral from the Luhuitou fringing reef of Hainan Island to reconstruct the historical variations of dissolved inorganic phosphorus (DIP) in surface seawater since 1870. The results reveal that coral P/Ca ratios in the Sanya coastal waters are jointly regulated by terrestrial inputs and upwelling processes. Specifically, P fertilizer application in agricultural activities has significantly increased terrestrial P loading, which is subsequently transported to coastal waters via submarine groundwater discharge (SGD). Crucially, El Niño-Southern Oscillation (ENSO)-driven regional hydrothermal conditions play a pivotal regulatory role in this process. Precipitation provides the transport momentum, while the anomalous high temperatures during El Niño years significantly accelerate chemical weathering, thereby greatly enhancing the P transport flux. Furthermore, against the background of long-term climate warming, this temperature-dominated weathering and transport mechanism is intensifying. The ENSO-modulated upwelling transports P-enriched deep water to the surface, creating a cumulative effect with anthropogenic P sources that collectively enhances marine primary productivity. Notably, the decline in live coral coverage of the Luhuitou fringing reef occurred prior to the marked rise in the coral P/Ca ratio, indicating that elevated DIP concentrations in seawater are not the primary driver of ecological degradation in this reef. This study not only confirms the unique value of coral geochemical proxies in deciphering long-term nutrient dynamics, but also highlights that the ongoing intensification of soil P weathering-transport processes in tropical regions under anthropogenic climate warming may pose potential ecological risks. These findings provide critical scientific supports for integrated coastal zone management.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"330 ","pages":"Article 109720"},"PeriodicalIF":2.6,"publicationDate":"2026-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038337","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":"Prevelance of the parasitic copepod Acanthochondria diastema Kabata, 1965 in wild populations of the southern sand flathead, Platycephalus bassensis","authors":"Peter G. Coulson,&nbsp;Jawahar G. Patil,&nbsp;Adam Davey,&nbsp;Alyssa Marshell","doi":"10.1016/j.ecss.2026.109712","DOIUrl":"10.1016/j.ecss.2026.109712","url":null,"abstract":"<div><div>The spatial and temporal prevalence of the parasitic copepod <em>Acanthochondria diastema</em> was examined in three populations of a key recreational fishery species, the southern sand flathead, <em>Platycephalus bassensis</em> across three geographically separated coastal regions of Tasmania, Australia. The parasitic copepods were observed in the buccal cavity of 21–27 % of fish sampled. The weak significant difference in parasite prevalence between regions indicates that there is negligible spatial effect on the prevalence of <em>A. diastema</em> in <em>P. bassensis</em>. Seasonal patterns were region-specific and the effect of location was weak, suggesting high connectivity among <em>P. bassensis</em> populations, likely facilitated by egg/larval dispersal via ocean currents. Fish length was the strongest predictor of parasite presence, with the probability increasing by approximately 1 % for each 1 mm increase in fish length. Fish age contributed significantly in only one region, while there were no sex-specific differences. Although <em>A. diastema</em> was first reported decades ago in <em>P. bassensis</em>, routine encounters have only emerged in recent years, raising concerns that warming waters and fishing pressure are reshaping host–parasite dynamics. These findings highlight the utility of parasite data for understanding exploited fish populations and provide optimism for rebuilding <em>P. bassensis</em> stocks given the limited population structuring in Tasmanian coastal waters.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"331 ","pages":"Article 109712"},"PeriodicalIF":2.6,"publicationDate":"2026-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146015731","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":"Integration of causal deep learning for tide level forecasting in data-scarce coasts","authors":"Mohammad Reza Nikoo","doi":"10.1016/j.ecss.2026.109715","DOIUrl":"10.1016/j.ecss.2026.109715","url":null,"abstract":"<div><div>Accurate prediction of tide gauge heights is crucial for effective coastal risk management, especially in data-scarce regions like Oman, where monitoring networks are limited. High Tide Flooding (HTF) behavior on Masirah Island is investigated in this study by combining meteorological records and a cutting-edge causal deep learning model. We compare four models—Gated Recurrent Unit (GRU), Long Short-Term Memory (LSTM), its variant Bidirectional LSTM (Bi-LSTM), Temporal Convolutional Network (TCN), and a newly developed Causal-Bi-LSTM—for their suitability in modeling tide gauge levels using precipitation, temperature, wind speed, and sea level pressure derived from ERA5-Land climate variables. Our study reveals that HTF events are highly seasonal, with 70 % occurring in June, primarily due to the combined effects of tidal (median contribution: 53.24 %) and non-tidal residual (110.57 %) effects. The Causal-Bi-LSTM model performed best (Nash–Sutcliffe Efficiency = 0.961, Correlation Coefficient = 0.99) when incorporating physical constraints, while sensitivity analysis revealed that sea level pressure was the key driver. Future projections under SSP scenarios unveil alarming trends: while SSP126 maintains conditions relatively stable, SSP245 and SSP585 exhibit intensification and seasonality in HTF events, with the high emission scenario (SSP585) projecting 36 events by mid-century and extending vulnerability to months not affected before. These results highlight the need for region-specific adaptation strategies and reveal how causal deep learning can enhance flood forecasting in terms of both accuracy and physical interpretability. The study provides a methodology for coastal vulnerability assessment that can be applied to other data-scarce regions with rising flood hazards under climate change.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"330 ","pages":"Article 109715"},"PeriodicalIF":2.6,"publicationDate":"2026-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038338","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":"Impacts of submarine groundwater discharge on nutrient variations and diatom species dominance in a brackish pond","authors":"Yejin Park ,&nbsp;Jeonghyun Kim ,&nbsp;Soojin Kang ,&nbsp;Yebin Jeon ,&nbsp;Jinsoon Park ,&nbsp;Inho Yang ,&nbsp;Yong Hwa Oh","doi":"10.1016/j.ecss.2026.109716","DOIUrl":"10.1016/j.ecss.2026.109716","url":null,"abstract":"<div><div>Submarine groundwater discharge (SGD) is an important driver for dissolved chemical constituents to oceans. To quantify SGD and determine its effects on nutrient concentration variations and benthic diatom community in a brackish pond system, we measured the concentrations of dissolved inorganic nutrients (nitrogen, phosphorus, and silicate), dissolved organic carbon (DOC), fluorescent dissolved organic matter (FDOM), and ²²²Rn activities. Based on the ²²²Rn mass balance, the estimated SGD rate in summer (32 ± 30 cm d⁻¹) was approximately three times higher than that in winter (11 ± 6.2 cm d⁻¹), and the SGD-derived nutrient fluxes were approximately 4–6 times higher in summer than in winter. The excess FDOM and DOC in the pond water observed in summer seems to be due to relatively higher SGD-derived nutrient inputs followed by higher biological activities such as diatom production, which is supported by the high (&gt;1; favorable condition for diatoms) dissolved inorganic silicate (DSi) to nitrogen (DIN) ratio and significant correlations (r² = 0.88 for C1, 0.87 for C2, and 0.87 for C4, <em>p</em> &lt; 0.05) between the excess FDOM and DSi:DIN ratio in summer. The abundance of dominant benthic diatom species in the pond sediment indicated significant differences in diatom communities with salinity, which was primarily controlled by the SGD input. Furthermore, the actinomycetes (<em>Gordonia</em> sp.) observed in the pond sediments indicate that this pond had been used as a wastewater pathway in the past. Our results contribute to a better understanding of the influence of submarine groundwater discharge on nutrient concentrations and associated biogeochemical characteristics in coastal systems such as brackish ponds.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"330 ","pages":"Article 109716"},"PeriodicalIF":2.6,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038476","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":"Warming sensitivity limits the proliferation of Undaria pinnatifida (Phaeaophyceae) in the Dutch delta","authors":"Xiaowei Ding ,&nbsp;Klaas Timmermans","doi":"10.1016/j.ecss.2026.109714","DOIUrl":"10.1016/j.ecss.2026.109714","url":null,"abstract":"<div><div>The non-native kelp <em>Undaria pinnatifida</em> has invaded European coastlines for decades, yet its presence in the Dutch Delta remains non-dominant. The mechanisms underlying this limited proliferation are poorly understood, but thermal sensitivity has been proposed as a potential constraint under ongoing ocean warming. To evaluate this, we conducted a controlled 21-day laboratory experiment to assess the effects of temperature on the survival, growth, photosynthetic efficiency, and nutrient (NO₃⁻ and PO₄³⁻) uptake of juvenile <em>U. pinnatifida</em> sporophytes. Survival declined significantly at elevated temperatures, with less than 50 % of individuals surviving after one week, in contrast to &gt;90 % survival at lower temperatures. Growth rates fluctuated around zero across most treatments and became consistently negative at higher temperatures. Nutrient uptake rates remained positive at all temperatures and were significantly enhanced at higher temperatures. Overall, our results indicate that elevated temperatures reduce the survival and growth of <em>U. pinnatifida</em> despite sustained nutrient uptake. This physiological sensitivity suggests that ongoing ocean warming may already be limiting its proliferation in the Dutch Delta and potentially in other regions. These findings offer valuable insight for anticipating future invasion dynamics and refining risk assessments under climate change.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"330 ","pages":"Article 109714"},"PeriodicalIF":2.6,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038339","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":"Size-related and habitat-dependent trophic dynamics of Manila clam, Ruditapes philippinarum, via bulk and amino acid isotopic signatures","authors":"Minhwa Gu ,&nbsp;Hee Young Yun ,&nbsp;Hyuntae Choi ,&nbsp;Jun-Ho Koo ,&nbsp;Kyung-Hoon Shin","doi":"10.1016/j.ecss.2026.109713","DOIUrl":"10.1016/j.ecss.2026.109713","url":null,"abstract":"<div><div>Individual body size plays a fundamental role in shaping the trophic dynamics of large marine predators that feed on prey at different trophic levels. However, this has rarely been explored in filter feeding animals that rely on temporally and spatially variable diet sources of similar trophic level. We tested whether the trophic dynamics of the filter-feeder Manila clam (<em>Ruditapes philippinarum</em>) are significantly associated with size gradients in different environments, a less sandy site (Pado) and a more sandy site (Hwangdo), via analyzing bulk and amino acid (AA)-specific carbon and nitrogen isotope ratios. Our results showed that there were significant site variations in clam abundance in addition to bulk isotope values, phenylalanine (Phe)-δ¹⁵N values, and AA-based trophic positions (TP_AA), suggesting site-specific trophic baselines. Consistently, in both sites, larger individuals exhibited higher isotope values and elevated even TP_AA (adjusted R² = 0.21–0.44), except for Phe-δ¹⁵N values, implying size-dependent trophic shifts in the filter-feeder clam, determined as herbivore. Based on δ¹³C patterns of essential AAs, clams along with microphytobenthos co-sampled in situ were close to a microalgal group (e.g., dinoflagellates), regarded as nutritionally dominant resources. Our data suggest that the individual size spectrum, equivalent to environmental differences, influences the trophic variation in herbivorous clams that feed on benthic algae. These findings underscore the need for ecosystem-based fishery management approaches that incorporate the size-dependent trophic dynamics of benthic consumers, rather than relying on uniformly sized consumers.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"330 ","pages":"Article 109713"},"PeriodicalIF":2.6,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145978791","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":"Inter-habitat partitioning of estuary blue carbon stocks: A spatial assessment of storage capacity and restoration opportunities","authors":"Daniel H. Buttner ,&nbsp;Lucienne R.D. Human ,&nbsp;Janine B. Adams","doi":"10.1016/j.ecss.2026.109709","DOIUrl":"10.1016/j.ecss.2026.109709","url":null,"abstract":"<div><div>Coastal wetlands, such as salt marsh and seagrass beds, are important sedimentary carbon sinks attributed to their inherent sequestration proficiencies. Their spatial heterogeneity however, introduces uncertainties in sediment blue carbon assessments, requiring explanatory understanding of causal factors, particularly where environmental gradients are evident. This study measured the spatial variability in sediment carbon stocks associated with seagrass, salt marsh, and degraded (disturbed, unvegetated sites) habitats, identifying causal geochemical factors. Significant intra-habitat sediment carbon partitioning was observed (mean <span><math><mrow><mo>±</mo></mrow></math></span> SE), where degraded habitats (83.63<span><math><mrow><mo>±</mo></mrow></math></span> 9.67 Mg C ha⁻¹) and supratidal <em>Salicornia pillansii</em> marsh (65.36 <span><math><mrow><mo>±</mo></mrow></math></span> 8.62 Mg C ha⁻¹) had significantly lower carbon stocks than intertidal salt marsh, <em>Spartina maritima</em> (203.25 <span><math><mrow><mo>±</mo></mrow></math></span> 35.03 Mg C ha⁻¹) and <em>Salicornia tegetaria</em> (243.58 <span><math><mrow><mo>±</mo></mrow></math></span> 67.84 Mg C ha⁻¹), as well as seagrass <em>Zostera capensis</em> (211.4 <span><math><mrow><mo>±</mo></mrow></math></span> 20.12 Mg C ha⁻¹). At the estuary scale statistical correlations were found between sedimentary stocks and several explanatory biogeochemical factors including sediment bulk density (SDB, <em>p</em> &lt; 0.01), particle size (<em>p</em> &lt; 0.05), total organic matter (<em>p</em> &lt; 0.001), and salinity (<em>p</em> &lt; 0.05). Furthermore, a significant inverse association was found between sediment carbon stocks and landward oceanic distance – stressing the effect of geomorphic setting on net estuarine sedimentary carbon accretion. By interpolating the spatial variability in sediment carbon stocks, this study identified opportunities for enhancing salt marsh carbon stock through restoration (385.4ha). The potential carbon emissions, attributed to possible degradation and loss of all habitats from the Swartkops Estuary, was predicted to be 2962.51 Mg CO₂e ha⁻¹ yr⁻¹. This further highlights the value of extant carbon stocks, opportunities for restoration of disturbed habitats, and the implications for potential carbon emissions from blue carbon habitats. Furthermore, it reinforces the importance of accounting for local carbon stock variability for blue carbon restoration and/or conservation actions.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"330 ","pages":"Article 109709"},"PeriodicalIF":2.6,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145978793","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":"Seek in ports and you shall find them: Monitoring marine invasions over time using combined standard assessment methods","authors":"Karen L. Castro ,&nbsp;Clara B. Giachetti ,&nbsp;Nicolás Battini ,&nbsp;Enrique M. Morsan ,&nbsp;Evangelina Schwindt","doi":"10.1016/j.ecss.2026.109711","DOIUrl":"10.1016/j.ecss.2026.109711","url":null,"abstract":"<div><div>Marine biological invasions pose a significant threat to biodiversity. Port areas are sites of major interest, as artificial structures and intense maritime traffic facilitate the arrival and spread of non-native species. Ports act as hotspots for invasions and as stepping-stones for the secondary spread of species into surrounding natural habitats. In this study, we aimed to identify and quantify marine non-native and cryptogenic invertebrate and macroalgae species in the two main Patagonian ports, Puerto Madryn and San Antonio Este, using standardized, replicable assessment methods and comparing communities over time. We conducted field surveys combining two methods previously applied in these ports (fouling samples and recruitment panels) and incorporated sediment sampling to monitor the infaunal benthic invertebrate community. We detected 30 non-native and 7 cryptogenic species, including 15 new records, and others whose status shifted from cryptogenic to non-native based on updated regional revisions. Overall, non-native species richness tripled in Puerto Madryn over eleven years. Few non-native species were shared between ports, suggesting port-specific species pools. Regardless of the port, nearly half of the identified species in this study are non-natives, underscoring the current magnitude of marine invasions in Patagonian ports. Our findings highlight the value of using complementary methods to enhance detection, as some species were recorded by only one approach. Finally, persistent taxonomic challenges, especially in groups like polychaetes and sponges, underscore the need to strengthen taxonomic capacity to improve early detection and effectively monitor temporal and spatial changes in port communities, which is essential for understanding and managing marine invasions.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"330 ","pages":"Article 109711"},"PeriodicalIF":2.6,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145978792","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":"Length-based assessment of growth and overexploitation risk of Larimichthys polyactis in the Yellow Sea","authors":"Xu Chen ,&nbsp;Qun Liu ,&nbsp;Suman Barua ,&nbsp;Eman A. AboEleneen","doi":"10.1016/j.ecss.2026.109708","DOIUrl":"10.1016/j.ecss.2026.109708","url":null,"abstract":"<div><div><em>Larimichthys polyactis</em>, one of the most commercially important fish species in the Yellow Sea in China, requires scientific stock assessment to improve its management for population recovery. This study aimed to estimate the growth pattern and stock status by using length-frequency data. A Length-Based Spawning Potential Ratio (LBSPR) and a length-based integrated model (LIME) methods were used. Projections and sensitivity analysis were also conducted to evaluate catch strategies and model robustness. Results showed that the fitted growth equation was <span><math><mrow><msub><mi>L</mi><mi>t</mi></msub><mo>=</mo><mn>23.24</mn><mrow><mo>(</mo><mrow><mn>1</mn><mo>−</mo><mi>exp</mi><mrow><mo>[</mo><mrow><mo>−</mo><mn>0.27</mn><mrow><mo>(</mo><mrow><mi>t</mi><mo>−</mo><mrow><mn>0.59</mn><mo>|</mo></mrow><mi>A</mi><mi>u</mi><mi>g</mi><mi>u</mi><mi>s</mi><mi>t</mi><mspace></mspace><mn>3</mn><mi>r</mi><mi>d</mi></mrow><mo>)</mo></mrow><mo>−</mo><mi>S</mi><mrow><mo>(</mo><mi>t</mi><mo>)</mo></mrow><mo>+</mo><mi>S</mi><mrow><mo>(</mo><mrow><mrow><mn>0.59</mn><mo>|</mo></mrow><mi>A</mi><mi>u</mi><mi>g</mi><mi>u</mi><mi>s</mi><mi>t</mi><mspace></mspace><mn>3</mn><mi>r</mi><mi>d</mi></mrow><mo>)</mo></mrow></mrow><mo>]</mo></mrow></mrow><mo>)</mo></mrow></mrow></math></span>. The exploitation rate was 0.58. LBSPR tended to output higher SPR estimates than LIME, with both methods indicating low SPR levels (0.16–0.3). LIME showed a more depleted stock status, suggesting start length at selectivity (SL) of 10.6–13.52 cm, while LBSPR suggested SL of 8.79–10.23 cm. Projections indicate that catches should be reduced to approximately 60,000 tons in the Yellow Sea to facilitate stock recovery. Sensitivity analysis showed that Natural mortality (M) and growth coefficient (K) inputs significantly affect both models. SPR decreased with increasing K, while showing a unimodal response to M. The effects on SL estimation were totally determined by M and K for LIME but insignificant for LBSPR. This study enhances understanding of life history traits and population dynamics of Yellow Sea <em>L. polyactis</em> stock, highlights its overexploitation status, and demonstrates the application of length-based integrated assessment methods in fisheries.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"330 ","pages":"Article 109708"},"PeriodicalIF":2.6,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145978790","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":"Seasonal variation of sharks and predatory fish in the northern Galapagos Islands of Darwin and Wolf","authors":"Marthje H. Schüler ,&nbsp;Simon J. McKinley ,&nbsp;Gabriel M.S. Vianna ,&nbsp;Ana V. Moya-Serrano ,&nbsp;Pelayo Salinas-de-León","doi":"10.1016/j.ecss.2026.109710","DOIUrl":"10.1016/j.ecss.2026.109710","url":null,"abstract":"<div><div>This study describes the seasonal effect of oceanography on fish assemblages in the northern Galapagos archipelago, that lies at the convergence of major oceanic currents in the Tropical Eastern Pacific. Total fish biomass was over three times larger in the cold season (25 t/ha) than in the warm season (7 t/ha). This difference was primarily driven by scalloped hammerhead sharks (<em>Sphyrna lewini</em>), whose biomass increased from 5 t/ha in the warm season to 21 t/ha in the cold season, reflecting seasonal migration. Benthopelagic teleosts - including large carangids, serranids, lutjanids - and the schooling planktivore <em>Cephalopholis colonus</em> also showed lower biomass during the warm season, likely due to lower productivity and prey availability. In contrast, demersal meso-predator and herbivore biomass remained relatively stable across seasons. Seasonal variation in reef fish assemblages at the islands of Darwin and Wolf was assessed using three stereo-video methods: Diver-Operated Video surveys and Baited Remote Underwater Video systems, the latter deployed both at the sea bottom and mid-water. Sampling occurred in the warm (March) and cold (August) season of 2017 on the islands' northwestern and southeastern coastlines. Overall, the high biomass recorded underscores the global conservation significance of these islands as aggregation site for <em>S. lewini</em>, a Critically Endangered species. Moreover, these findings highlight the substantial seasonal variability in reef fish abundance in Galapagos, and the value of multiple stereo-video methods for detecting seasonal patterns. This is particularly the case at oceanic islands where highly mobile species show pronounced temporal variability.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"330 ","pages":"Article 109710"},"PeriodicalIF":2.6,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145978801","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}