Continental Shelf Research最新文献

{"title":"Marine heatwaves detected by a network of buoys along the entire US West Coast Shelf","authors":"Gavin Plume ,&nbsp;Ryan K. Walter ,&nbsp;Piero L.F. Mazzini ,&nbsp;Michael Dalsin","doi":"10.1016/j.csr.2025.105552","DOIUrl":"10.1016/j.csr.2025.105552","url":null,"abstract":"<div><div>Marine heatwaves (MHWs), prolonged periods of anomalously warm waters, pose an increasing threat to marine ecosystems globally. While satellite-based data offer insights into MHW patterns, coastal upwelling regions are prone to satellite biases and require long-term in-situ datasets for accurate characterization. Using two decades of temperature data from 22 surface buoys distributed along the US West Coast continental shelf (10–50 km offshore) spanning nearly 2000 km of coastline, we investigated, for the first time, coast-wide patterns of MHWs in this valuable region. The spatial extent of MHWs varied from 100% of buoys during the 2014–2016 North Pacific MHW, to less than 50% during regional events, to single buoys, highlighting the broad range of MHW scales and drivers. Upwelling was a strong contributor to MHW patterns, both on seasonal time scales with less MHWs during the spring/summer upwelling season, as well as synoptic time scales with the initiation and termination of MHWs linked with anomalously weak and strong upwelling, respectively. This was especially evident in central and northern California, where upwelling intensity and variability were stronger and regional co-occurrence lower, than in southern California and Oregon/Washington, where upwelling was weaker and regional co-occurrence higher. Furthermore, there were almost no long-term trends in MHW metrics along the coast, suggesting this region could serve as a thermal refugia in a warming ocean. Effective management and forecasting of coastal MHWs in this region will require capturing a broad range of spatial scales and drivers, with site-specific studies and/or high-resolution models important in many cases.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"294 ","pages":"Article 105552"},"PeriodicalIF":2.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144892882","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 role of barrier reef protection to storm surge during tropical cyclones in a narrow lagoon, New Caledonia, south west Pacific","authors":"Maxime Duphil ,&nbsp;Jérôme Lefèvre ,&nbsp;Swen Jullien ,&nbsp;Jean Roger ,&nbsp;Pascal Dumas ,&nbsp;Romain Le Gendre ,&nbsp;Jérôme Aucan ,&nbsp;Myriam Vendé-Leclerc ,&nbsp;Martin Bénébig ,&nbsp;Christophe Menkes","doi":"10.1016/j.csr.2025.105540","DOIUrl":"10.1016/j.csr.2025.105540","url":null,"abstract":"<div><div>Pacific islands are exposed to coastal hazards, particularly storm surges resulting from low pressure, extreme winds, and waves. While coral reefs naturally protect shorelines from incident waves, the diversity of reef geomorphologies induce various coastal responses, complicating hazard prediction based on offshore conditions. Understanding lagoon storm surge dynamics is therefore crucial for developing adaptation strategies to address global warming and sea-level rise. This study investigates the storm surge response of the narrow and shallow lagoon of Poe in New Caledonia using the SCHISM-SWAN coupled circulation-wave numerical model under tropical cyclone conditions. A retrospective of the 2019 cyclonic season shows that maximum storm surge is concentrated in the narrowest part of the lagoon, where human infrastructures are located, increasing exposure to extreme water levels. Modifying the reef structure to a more irregular form reveals that macro-scale reef features can mitigate wave setup intensity. Additionally, water depth variations over the reef crest significantly affect wave setup, with up to 30 % difference between high and low tides. A broader generalization based on 258 synthetic cyclone tracks highlights that within the lagoon, wave setup accounts for approximately 70 % of the storm surge, rising to 90 % during the most extreme event. These results showing that the wave contribution is essential for accurate storm surge prediction. The findings provide critical insights for improving coastal hazard assessment, land use planning, and resilience strategies in reef island environments facing climate change.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"294 ","pages":"Article 105540"},"PeriodicalIF":2.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144828860","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":"Silent survivors: diatom resilience in Mediterranean Temporary Ponds","authors":"Davide Taurozzi ,&nbsp;Massimiliano Scalici","doi":"10.1016/j.csr.2025.105547","DOIUrl":"10.1016/j.csr.2025.105547","url":null,"abstract":"<div><div>Mediterranean Temporary Ponds (MTPs) are ephemeral freshwater habitats hosting a large number of aquatic and terrestrial organisms. Among these, diatoms represent the bioindicators that contribute mostly to Earth's global primary production. Herein, we focused our attention on the role of seasonality and hydroperiod on benthic diatoms of MTPs. We analyzed the diatom community turnover along one year in two MTPs in the Latium region, Italy. The two MTPs showed different levels of anthropogenic pressures. Our results demonstrated that hydroperiod length and seasonality showed a moderate influence on diatom richness of MTPs; in particular, although the highest number of species was found during spring, taxonomic diversity remained stable at seasonal and inter-annual level despite strong changes in community composition and hydroperiod length. Overall, sampling sites showed different ecological conditions and chemical drivers: protected site was dominated by species occurring in minimally impacted oligo- to mesotrophic waters; unprotected site with high EC and ORP was dominated by species occurring in euryhaline brackish waters. Moreover, physicochemical parameters showed a low influence on diatom assemblages in the protected site and a strong influence in the unprotected site. No significant correlation between diatom ecological guilds and physicochemical parameters emerged. While for all the seasons the dominant guild was the motile guild, no inter-season variations emerged: diatom communities and ecological guilds in MTPs are resilient to seasonal variations. To provide novel insights, future research should focus on additional environmental drivers such as nutrient availability, sediment composition, and hydrological variability, including long-term monitoring plans.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"294 ","pages":"Article 105547"},"PeriodicalIF":2.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144851866","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":"Analysis of turbulence characteristics in a nearshore area beyond the surf zone of a mesotidal bay","authors":"Victor A. Arias-Esquivel,&nbsp;Victor M. Godínez,&nbsp;Markus Gross,&nbsp;Anahí Bermúdez-Romero,&nbsp;Vanesa Magar","doi":"10.1016/j.csr.2025.105530","DOIUrl":"10.1016/j.csr.2025.105530","url":null,"abstract":"<div><div>Turbulence impacts renewable energy converters’ performance due to differences in turbulent kinetic energy (TKE) production and TKE dissipation in estuarine, coastal, and shelf regions. However, the turbulence structure under different environmental forcings is not well understood. This study uses waves, tides, and wind data to analyse the mean flow field and turbulence characteristics in Todos Santos Bay (TSB), a mesotidal bay in the northern Mexican Pacific. The main results are based on a month-long time series obtained with a Sentinel V50, a five-beam Acoustic Doppler Current Profiler (ADCP), installed in a location within the bay where currents are less than 0.55 m s⁻¹. A tidal decomposition analysis of sea level and current data confirmed mixed and predominantly semi-diurnal tides. Waves and wind stresses affect the flow in the layers near the sea surface. We computed the Reynolds stresses, TKE, anisotropy, TKE production and TKE dissipation to characterize the turbulence properties. The zonal vertical Reynolds stress increases from the bottom upwards, while the meridional vertical Reynolds stress decreases from the bottom upwards. The turbulent kinetic energy increases from the bottom upwards. The waves do not significantly affect the Reynolds stresses, the TKE, or the anisotropy ratio when the significant wave height is less than 0.7 m. It is worth highlighting that strong wave conditions have an important effect on the turbulence characteristics of the site, even during spring tides. In addition, turbulent processes change with time following flood and ebb tides in the bay, and the TKE and the zonal vertical Reynolds stress are higher during neap tides than during spring tides. Finally, TKE budget computations showed that TKE dissipation dominates over TKE production, implying the existence of non-local transport to the TKE budget at the site; these turbulence metrics are enhanced during neap tides.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"294 ","pages":"Article 105530"},"PeriodicalIF":2.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144828908","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":"Bioproductivity of the surface waters in the Guiana Basin (Atlantic ocean): new integrated approach","authors":"Svetlana Krasheninnikova ,&nbsp;Alexander Sysoev ,&nbsp;Alexander Demidov ,&nbsp;Raisa Lee ,&nbsp;Inna Sysoeva ,&nbsp;Sergey Babich ,&nbsp;Fedor Gippius","doi":"10.1016/j.csr.2025.105550","DOIUrl":"10.1016/j.csr.2025.105550","url":null,"abstract":"<div><div>The purpose of this research to assess bioproductivity and trophicity of surface waters in the Guiana Basin to identify favorable conditions for the development of phytoplankton – a marker of the ocean ecosystem state. We use of data on phytoplankton (species and quantitative analysis) and biochemical parameters (concentrations of adenosine triphosphate and chlorophyll <em>a</em>) to determine the maturity stages and nutritional type of the communities using a new integrated approach. These data are obtained either from in situ measurements and sampling during a cruise in winter 2022, or satellite observations. An analysis of the phytoplankton distribution was carried out in conjunction with abiotic factors (temperature, salinity, dissolved oxygen, phosphate concentrations) for the photic layer 0–50 m. Generally, the main finding of our study is that in the Vema Fracture zone (mesotrophic waters) autotrophs prevail with the dominance of diatom microalgae (corresponding to equilibrium community); whereas in the Guiana section oligotrophic waters) heterotrophs prevail with the dominance of dinophytic microalgae (corresponding to developed and mature communities). This distribution is confirmed by the heterotrophic photoautotrophic index values (HPI). Concluding a discussion, we show that winter distribution of phytoplankton and the maturity degree of its community in the study area, are associated with the supply of nutrients due to the advection of Amazon waters by the North Brazil Current – North Equatorial Countercurrent system.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"294 ","pages":"Article 105550"},"PeriodicalIF":2.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144879794","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":"Simulation and Lagrangian analysis of coastal upwelling in the northwestern East/Japan sea","authors":"P.A. Fayman,&nbsp;I.S. Solonets,&nbsp;S.V. Prants,&nbsp;M.V. Budyansky,&nbsp;A.A. Didov","doi":"10.1016/j.csr.2025.105535","DOIUrl":"10.1016/j.csr.2025.105535","url":null,"abstract":"<div><div>The autumn monsoon coastal upwelling in the northwestern East/Japan Sea (EJS) was studied using five upwelling indices, 3D tracking of Lagrangian particles, finite-time Lyapunov exponents, and satellite data on sea surface temperature (SST) and chlorophyll-a concentration. The coastal upwelling, which had not yet been quantitatively simulated and studied in the area, begins at the end of September when northwesterly and westerly winds dominate. The simulations were conducted using the Regional Ocean Model System (ROMS) with a high horizontal resolution of 600 m. The upwelling intensity has been estimated by calculating SST difference between the coastal and offshore zones, the Ekman transport and pumping indices, sea surface height and speed of offshore surface currents. A strong upwelling event in the fall of 2017 was identified through calculations of the thermal upwelling index and other indices over the extended period from 1999 to 2019, based on model results and satellite observations. The intermittency of active and break phases during the 2017 upwelling event correlated with variations in wind direction and surface wind stress curl in the study area. The upwelling of cold bottom water to the surface was directly simulated via 3D Lagrangian particle tracking in the model velocity field. Deep-water upwelling is a dynamic process, with the distribution of upwelled particles reaching the surface layer correlating with the wind-induced upwelling index near the coastal area bounded by the 60 m isobath. Another key result of this study is the identification of transport barriers separating surface waters with different temperatures. These barriers were identified by maxima in the finite-time Lyapunov exponent, which provided insights into upwelling thermal fronts and associated transport patterns. The simulation results agreed with satellite-derived SST and chlorophyll-a data from the fall of 2017, as well as with satellite and <em>in situ</em> observations of coastal upwelling in the study area from other years.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"294 ","pages":"Article 105535"},"PeriodicalIF":2.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144851867","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 variations and controlling factors in phytoplankton composition at deep chlorophyll maxima in the Bay of Bengal","authors":"V.V.S.S. Sarma ,&nbsp;P. Paul ,&nbsp;J.S. Patil","doi":"10.1016/j.csr.2025.105539","DOIUrl":"10.1016/j.csr.2025.105539","url":null,"abstract":"<div><div>The occurrence of deep chlorophyll maxima (DCM) in the stratified oceanic regions is reported either due to photoacclimation or the availability of nutrients. The influence of mesoscale processes, such as eddies, on the depth of DCM, phytoplankton composition, and the fate of phytoplankton pigments in the Bay of Bengal is unclear. Based on the <em>in-situ</em> observations in the water column, the role of eddies on spatial variability in the depth of DCM and phytoplankton composition was studied. The depth of DCM varied between 20 and 80 m. It was shallowed and deepened in the cyclonic (CE) and anticyclonic (ACE) eddy regions by 20–40 m due to convergence and divergence, respectively. The depth of DCM displayed a significant linear relationship with nutricline and an inverse relationship with the percentage of surface photosynthetic active radiation (PAR) reaching the depth of DCM. The chlorophyll-a (Chl-a) concentration in the DCM varied between 0.2 and 1.1 mg m⁻³ and was inversely related to the PAR reached and nutrient concentrations at this depth. Prymnesiophytes, chlorophytes, cyanobacteria and prochlorophytes significantly contributed to the phytoplankton in the DCM, but their contribution varied with the amount of PAR received and nutrient concentrations at the DCM. The biomass of prymnesiophytes and chlorophytes increased with an increase in PAR and nutrients at DCM and contrasted with that observed for cyanobacteria and prochlorophytes. The dominance of prymnesiophytes and chlorophytes was observed in regions where shallow (&lt;40m) DCM was present. Cyanobacteria and prochlorophytes were abundant in areas with deep DCM, due to variable light adaptations. Some physical processes bring phytoplankton in the DCM to the surface, and to examine its fate, a microcosm experiment was conducted by incubating DCM waters under surface light. The microcosm experiments suggested that premnesiophytes and chlorophytes decreased by 85–90 %, whereas a 65 % decrease was noticed in the case of cyanobacteria and prochlorophytes from that of the initial. This suggests an increase in Chl-a, after intense physical mixing, may be due to new production arising from nutrients upwelling. The numerical models simulate the depth of DCM, but the composition of phytoplankton groups can be simulated using the governing factors derived in this study to evaluate their role in primary and export production and carbon sequestration in the stratified ocean.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"294 ","pages":"Article 105539"},"PeriodicalIF":2.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144828861","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":"Monitoring of marine pollution and stress responses: Radionuclides concentration and antioxidant molecules in macroalgae and seagrass","authors":"Nurdan Akakçe ,&nbsp;Aysun Uğur Görgün ,&nbsp;İnci Tüney ,&nbsp;Berkay Camgöz ,&nbsp;İlker Sert","doi":"10.1016/j.csr.2025.105538","DOIUrl":"10.1016/j.csr.2025.105538","url":null,"abstract":"<div><div>The biological effects of marine radionuclides on the macroalgae <em>Cystoseira crinita</em> and <em>Halopteris scoparia</em>, as well as the seagrass <em>Cymodocea nodosa</em>, were investigated in İzmir Bay. Concentrations of radionuclides ²¹⁰Pb, ²²⁶Ra, ²³²Th, and ⁴⁰K were measured in samples of <em>C. crinita</em> and <em>H. scoparia</em>, whereas only ²¹⁰Pb and ⁴⁰K concentrations were determined in <em>C. nodosa</em>. In this study, ²¹⁰Pb concentrations ranged from 11.38 to 31.72 Bq/kg in <em>C. crinita</em>, 19.7–98.02 Bq/kg in <em>H. scoparia</em>, and 26.09–81.27 Bq/kg in <em>C. nodosa</em>. Elevated ²¹⁰Pb levels in <em>H. scoparia</em> and <em>C. nodosa</em> were observed predominantly during autumn and winter. The ²¹⁰Po/²¹⁰Pb activity ratios were found to range between 1.45 and 2.25 in <em>C. crinita</em>, 0.15–1.30 in <em>H. scoparia</em>, and 0.70–1.47 in <em>C. nodosa</em>. The antioxidant defense mechanisms in response to radiation-induced stress were examined in both macroalgae and seagrass samples, focusing on key biomarkers such as ascorbate peroxidase (APX), catalase (CAT), and proline. Correlation analyses were conducted between radionuclide concentrations and antioxidant activity. <em>C. crinita</em> exhibited a defense response to ²¹⁰Pb exposure similar to that of ²¹⁰Po, primarily through increased CAT enzyme activity. In <em>C. nodosa</em>, elevated ⁴⁰K levels were associated with enhanced proline and APX responses, while the accumulation of ²¹⁰Pb was met with a significant increase in proline-mediated antioxidant defense.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"293 ","pages":"Article 105538"},"PeriodicalIF":2.2,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144780033","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":"Environmental DNA (eDNA) detection reveals strong connectivity and similar co-occurrence patterns of planktonic and benthic eukaryote communities in Dinghai bay","authors":"Qiushi Chen ,&nbsp;Qianqian Liu ,&nbsp;Peng Xiao ,&nbsp;Yifan Ma ,&nbsp;Zhongzhou Lin ,&nbsp;Zhuoyi Zhu ,&nbsp;Lianming Zheng ,&nbsp;Wenjing Zhang","doi":"10.1016/j.csr.2025.105525","DOIUrl":"10.1016/j.csr.2025.105525","url":null,"abstract":"<div><div>Exploring the relationship between planktonic and benthic eukaryotes in coastal zones is of great significance for us to further understand the influence of environmental conditions on microbial ecosystems and the integrated management of biological resources and ecological landscape in coastal areas. In this study, environmental DNA (eDNA), co-occurrence network analysis and the SourceTracker analysis were used to analyze seawater and sediment samples from Dinghai Bay, Fujian Province. Community structure, diversity, and co-occurrence patterns of eukaryotes, especially microeukaryotes in different habitats were compared. The results showed that: (1) There are differences between planktonic and benthic eukaryote communities to some extent. The diversity of benthic eukaryotes is significantly higher than that of planktonic eukaryotes. Environmental factors such as transparency, TDS (total dissolved solids) and salinity are significantly correlated with planktonic eukaryotes, while benthic eukaryotes are only correlated with conductivity. In addition, the planktonic community shows a strong distance-decay pattern while the benthic community did not. (2) There is strong connectivity between planktonic and benthic eukaryotes. The proportion of shared zero-radius operational taxonomic units (ZOTUs) in planktonic and benthic eukaryotes was 96.70% and 77.65%, respectively, and more than 92% of shared ZOTUs were not significantly different between two habitats. In addition, SourceTracker analysis showed that 59.70% of the benthos came from the planktonic community and 91.22% of the plankton from the benthic community. Plankton such as copepod, diatoms, dinoflagellata and ciliates live in sediments at some life stages,and there is often a planktonic larval stage in the life cycle of benthos. On the other hand, our study area is located in the intertidal zone and subtidal zone with special environmental conditions, which is influenced by tides, winds and river freshwater, and the constant mixing of surface and bottom water is also a possible reason. (3) The co-occurrence network analysis shows that the co-occurrence patterns of eukaryotes in the two habitats are similar to a considerable degree. Positive correlations are dominant in both planktonic and benthic communities, and the ratio of positive and negative correlations has no significant difference between two communities.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"293 ","pages":"Article 105525"},"PeriodicalIF":2.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144686949","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":"A three-year survey of hatched elasmobranch egg capsules on Santa Catarina Island, Southern Brazil","authors":"Carlos Alberto da Silva Junior ,&nbsp;Guilherme Burg Mayer ,&nbsp;Áthila Andrade Bertoncini ,&nbsp;Rafael de Lima ,&nbsp;Renato Hajenius Aché de Freitas","doi":"10.1016/j.csr.2025.105528","DOIUrl":"10.1016/j.csr.2025.105528","url":null,"abstract":"<div><div>Over a three-year survey, the present study investigated the diversity of hatched elasmobranch egg capsules along the six beaches of Santa Catarina Island, Southern Brazil. Egg capsules (1,773) from seven elasmobranch taxa were record, including six skate taxa (<em>Atlantoraja castelnaui</em>, <em>Atlantoraja</em> spp., <em>Psammobatis</em> spp., <em>Rioraja agassizii</em>, <em>Sympterygia acuta</em>, and <em>Sympterygia bonapartii</em>) and, notably, the first report of a shark egg capsules on a Brazilian beach, the frecked catshark <em>Scyliorhinus haeckelii</em>. The three species with the highest number of collected egg capsules (&gt;90) were selected to assess the influence of temperature on their reproductive cycles. There was a predominance of capsules in the <em>warm</em> (spring and summer) season for <em>S. acuta</em> and <em>Psammobatis</em> spp. There was no significant difference in the number of egg capsules between <em>warm</em> and <em>cold</em> (autumn and winter) seasons for <em>R. agassizii,</em> suggesting an active reproductive pattern throughout the year. We also verified the difference in the number of egg capsules among six beaches using data from <em>R. agassizii</em> which was related to areas sheltered (rocky coastline, island) from winds and prevailing ocean currents along the island. These findings were important to increase the knowledge of oviparous elasmobranch species from the Western South Atlantic, underscoring the importance of egg capsule monitoring to understand the biodiversity and reproductive ecology of the local species, which are crucial for effective conservation strategies.</div></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"293 ","pages":"Article 105528"},"PeriodicalIF":2.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144679261","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}