Continental Shelf Research最新文献

{"title":"Trophic variability of inter- and intra-copepod species in the South Sea of Korea during summer","authors":"Hyuntae Choi ,&nbsp;Seeryang Seong ,&nbsp;Nayeon Park ,&nbsp;Seunghan Lee ,&nbsp;Dokyun Kim ,&nbsp;Wonchoel Lee ,&nbsp;Kyung-Hoon Shin","doi":"10.1016/j.csr.2024.105175","DOIUrl":"10.1016/j.csr.2024.105175","url":null,"abstract":"<div><p><span><span>Spatial variation and interspecies differences in the trophic position (TP) of copepods were investigated using nitrogen isotope ratios<span> of amino acids. In the summer of 2021, coastal waters and the Changjiang diluted water generated clear seawater temperature and salinity fronts in the South Sea of </span></span>Korea. </span><em>Paracalanus parvus</em> s. l. was a dominant species in the copepod community, and the second dominant species differed among inshore, intermediate, and offshore sites. The TP of each copepod species was estimated in two ways, considering only metazoan diets (TP_Glu<span>, based on glutamic acid and phenylalanine nitrogen isotope ratios) and both metazoan and protistan diets (TP</span>_Ala, based on alanine and phenylalanine nitrogen isotope ratios). Both TP_Glu and TP_Ala indicated trophic variability among copepod species and the contribution of protistan diets as a food source in the study area. <span><em>Calanus</em><em> sinicus</em></span> showed a similar herbivorous TP of 2.0 in both TP_Glu and TP_Ala, suggesting little contribution from protistan diets. Two copepod species (<em>P. parvus</em> s. l. and <span><em>Acartia</em><em> omorii</em></span>) exhibited TP_Glu values of approximately 2.0 but their TP_Ala<span> values increased from 0.1 to 0.5, indicating mixed diets of both primary producers and protists. The other three copepods (</span><em>Pseudocalanus</em> sp., <em>Oithona similis</em>, and <em>O. atlantica</em>) showed a wide range in TP_Glu (2.4–3.1) and TP_Ala (2.7–3.4), suggesting that protistan trophic transfers enhance TP_Ala<span> (by up to 0.5) in omnivorous copepods. We found a spatial variation in the TPs of copepods among water masses by various controlling factors including surface seawater temperature, salinity, and size-fractionated Chl-</span><em>a</em>. Our findings support that the <span>TP</span> values could be potential indicative of interspecies variability, providing useful information on the composition of the planktonic food web.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139373798","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":"Surface circulation in Todos Santos Bay, Baja California, México","authors":"Reginaldo Durazo ,&nbsp;Xavier Flores-Vidal ,&nbsp;Rubén Castro ,&nbsp;Francisco J. Ocampo-Torres ,&nbsp;Johanna Saavedra ,&nbsp;Isaac Rodríguez-Padilla ,&nbsp;Marco Larrañaga","doi":"10.1016/j.csr.2024.105171","DOIUrl":"10.1016/j.csr.2024.105171","url":null,"abstract":"<div><p>Depending on dimensions, orientation and topographic features, the circulation of semi-enclosed seas adjacent to regions of coastal upwelling are strongly influenced by their interaction with a shelf upwelling jet of adjacent waters. A special case are square bays, where opening is about the same size as length, and are bordered by headlands at the entrance. This study analyzed surface currents measured between 2009 and 2020 with high-frequency (HF) radar in Todos Santos Bay, a square bay located in northwestern México, to obtain mean and seasonal surface circulation patterns. HF radar measurements indicate that the average circulation pattern within the bay is cyclonic, with water of the California Current (CC) entering primarily as a coastal jet through the northern mouth of the bay. The similarity of monthly average maps with the long-term average suggests the cyclonic circulation persists year-round. Scale analysis demonstrates that given the size of the bay, only one eddy, primarily controlled by inertia, is dominantly formed inside. The mean cyclonic circulation defines the bay as an upwelling shadow.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139102802","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":"Iberian Atlantic Margin: Natural and anthropogenic processes and records","authors":"Alejandro Cearreta,&nbsp;María Jesús Irabien,&nbsp;Ane García-Artola","doi":"10.1016/j.csr.2024.105174","DOIUrl":"10.1016/j.csr.2024.105174","url":null,"abstract":"","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139102969","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":"Relationships between high temperatures and Pacific Oyster disease and mortality in southeast Tasmania, Australia","authors":"Jiaxin Shi ,&nbsp;Jules B. Kajtar ,&nbsp;Hakase Hayashida ,&nbsp;Sarah C. Ugalde","doi":"10.1016/j.csr.2024.105173","DOIUrl":"10.1016/j.csr.2024.105173","url":null,"abstract":"<div><p>Warm ocean temperature extremes, including marine heatwaves, have profound impacts on natural marine systems and aquaculture industries across the globe. In Tasmania, Australia, one aquaculture industry that has been significantly impacted by warm temperatures is Pacific Oyster (<em>Magallana gigas</em>, previously named <em>Crassostrea gigas</em>) farming, due to recurring outbreaks of the virus <em>Ostreid herpesvirus 1.</em> Such viral outbreaks are understood to be driven by high seawater temperatures, but the temperature threshold or duration for triggering disease and mortalities remain unclear. This study investigates the relationship between in-situ farm temperatures and oyster disease and mortality on the southeast coast of Tasmania, Australia using daily observations from three oyster growing areas (Pipe Clay Lagoon, Upper Pittwater, and Lower Pittwater) over three seasons. It is found that a 12-day averaged daily mean temperature is an excellent measure of the occurrence of high mortality. Specifically, a 21-day mean of 23.7 °C resulted in a 70% likelihood of high mortality, which is defined here as oyster losses of &gt;15%. On the other hand, for lower levels of disease and mortality, a 12-day average of daily mean temperature gave the strongest relationship. A 12-day mean of 19.7 °C led to 70% probability of some disease and low mortality. The analysis also found in-situ farm temperature generally correlates well with remotely sourced temperature observations, indicating their potential usability for operational management. This study demonstrates a statistical risk analysis framework for the oyster farming industry, helping to improve the understanding of the detrimental impact of high temperatures on Pacific Oysters.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0278434324000037/pdfft?md5=99f99c159c8ecc4900d7fcc07bd50529&pid=1-s2.0-S0278434324000037-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139102806","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":"Diapycnal mixing induced by salt finger and internal tides on the northwest coast of India","authors":"M.S. Girishkumar ,&nbsp;K. Ashin ,&nbsp;E. Pattabhi Rama Rao","doi":"10.1016/j.csr.2024.105172","DOIUrl":"10.1016/j.csr.2024.105172","url":null,"abstract":"<div><p><span><span>Microstructure measurements of velocity shear from the continental slope of the northwest coast of India (NWCI) in the eastern </span>Arabian Sea<span> are used to quantify the relative importance of double diffusion and internal tides induced diapycnal mixing in the different depth layers. It is found that the hydrographic conditions in the NWCI are conducive to the formation of moderately strong salt fingering (Turner angle between 55° and 72°). However, salt finger-induced vertical mixing dominates only in the upper 180 m of the water column, below which intense shear-driven turbulent mixing due to internal tide reduces its significance. As a result of this, the staircase structures, a measure of salt finger dominance in the water column, are frequent, and the mean temperature change across the interface (</span></span><em>DT</em>_<em>IH</em>; 0.33 °C) is relatively larger in the upper 180 m compared to sporadic occurrence of steps with a small magnitude of <em>DT</em>_<em>IH</em><span> (0.18 °C) below 180 m. It is also found that in the upper 180 m of the water column in the NWCI, mean diapycnal diffusivity (</span><em>K</em>_<em>ρ</em>) is approximately a factor of eight larger (8.3 ± 1.3 × 10⁻⁵ m²s⁻¹<span>) than the estimation in the open ocean region of the eastern Arabian sea (5.4 ± 1.1 × 10</span>⁻⁶ m² s⁻¹). However, due to internal tides, the magnitude of <em>K</em>_<em>ρ</em> reaches as large as O (10⁻²) m² s⁻¹ below 180 m in the NWCI. The mean downward heat flux estimated in the salt finger-dominated (upper 180 m) layers is ∼ -6.1 Wm^-2, and the shear-driven mixing-dominated layers (below 180 m) is ∼ -10.2 Wm^-2.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139373560","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 distribution and habitat relationship of sea urchin assemblages (Echinodermata: Echinoidea) in Hong Kong waters","authors":"Sam King Fung Yiu ,&nbsp;Sheena Suet-Wah Chung","doi":"10.1016/j.csr.2023.105170","DOIUrl":"10.1016/j.csr.2023.105170","url":null,"abstract":"<div><p><span>Sea urchins<span> are important components of marine ecosystems<span><span> and can act as bioindicators, reflecting the health of reefs. The spatial patterns of sea urchins are largely shaped by the type of habitat. In Hong Kong, </span>coral communities are divided into two distinct types: reef-building coral habitats and non-reef-building coral habitats. In summer 2020, a qualitative survey was conducted using SCUBA at 56 sites across eastern and western waters, recording a total of 11 species from 6 families of sea urchins. Out of these 56 sites, 14 were selected for a quantitative survey to investigate the relationship between sea urchin assemblages and the two types of coral habitat. We found that the species composition of sea urchins differed significantly between the two habitats, and the presence of sand was a critical factor influencing the species composition of sea urchins. Sand coverage had a positive effect on </span></span></span><em>Salmasic sphaeroides</em> abundance but a negative effect on the abundance of <em>Diadema setosum</em> and <em>Heliocidaris crassispina</em>. The distribution of sea urchins across different degrees of sand coverage may be associated with food availability or species-specific adaptive behaviour, likely due to niche preferences.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139068831","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":"Corrigendum to “Typological representation of the offshore oceanographic environment along the Alaskan North Slope” [Continent. Shelf Res. 244 (2022)]","authors":"William K. Eymold ,&nbsp;Christopher Flanary ,&nbsp;Li Erikson ,&nbsp;Kees Nederhoff ,&nbsp;Christopher C. Chartrand ,&nbsp;Craig Jones ,&nbsp;Jeremy Kasper ,&nbsp;Diana L. Bull","doi":"10.1016/j.csr.2023.105148","DOIUrl":"10.1016/j.csr.2023.105148","url":null,"abstract":"","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0278434323002261/pdfft?md5=a10ed042aa65d5ced4997b248f22d57d&pid=1-s2.0-S0278434323002261-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138690675","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":"Benthic macroinfaunal communities of the pockmark fields in the south-eastern Bay of Biscay","authors":"Joxe Mikel Garmendia ,&nbsp;Iñigo Muxika ,&nbsp;José Germán Rodríguez ,&nbsp;Beatriz Arrese ,&nbsp;Irene Díez-García ,&nbsp;María Gómez-Ballesteros ,&nbsp;Francisco Sánchez ,&nbsp;Ángel Borja ,&nbsp;Ibon Galparsoro","doi":"10.1016/j.csr.2023.105162","DOIUrl":"10.1016/j.csr.2023.105162","url":null,"abstract":"<div><p>Pockmarks are concave depressions on the sea bottom produced by fluid escape from subaqueous sediments which can be found worldwide in muddy and silt/clay sediments. Due to their morphological and geochemical characteristics, certain pockmarks play an important role in structuring benthic communities, and consequently, they have been proposed to be protected. The present research provides a characterisation of the benthic macrofauna composition in pockmark fields in the southeaster Bay of Biscay. A total of 11 samples were acquired in and close to pockmarks covering a range of depths of 414–992 m. The survey strategy considered the acquisition of one sample inside of each of the selected pockmarks and another sample near, but out of them. Collected macrofaunal organisms were identified at lowest taxonomical level (species) when possible, structural parameters were calculated and a hierarchical cluster analysis carried out with species data. Species density, biomass, richness, diversity and evenness were found to be higher in samples collected inside pockmarks in comparison to samples obtained outside but not statistically significant. This could be explained by the inactivity of the studied pockmarks, which do not offer/generate a particular environment with unusual characteristics that limit or enhance the development of specific species/groups with special traits.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0278434323002406/pdfft?md5=0813bd7056ea95272da6adf0b637dcb3&pid=1-s2.0-S0278434323002406-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138569032","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":"Sedimentary mud and phaeophytin-a are reliable predictors of oxygen consumption and nitrogen turnover in the southern North Sea","authors":"Fabrizio Minutolo ,&nbsp;Kirstin Dähnke ,&nbsp;Marc Metzke ,&nbsp;Moritz Holtappels ,&nbsp;Andreas Neumann","doi":"10.1016/j.csr.2023.105161","DOIUrl":"10.1016/j.csr.2023.105161","url":null,"abstract":"<div><p>Coastal systems are exposed to variable human uses and anthropogenic pressures, yet they provide valuable ecosystem services. Understanding the benthic processes in these systems is crucial for their effective management and conservation. This study investigates sediment characteristics as proxies for oxygen and nitrogen turnover in coastal, sandy, permeable sediments. We incubated sediment samples to quantify the turnover of ammonium and nitrate and analyzed various sediment properties to determine the most suitable predictors of sediment reactivity. Oxygen consumption rates and rates of ammonium and nitrate turnover strongly correlate with mud content and phaeophytin-a, which are identified as the best proxies for sediment reactivity. Ultimately, our data show that sediment nutrient recycling and turnover is intimately linked to spring primary production in the water column. In order to deduce reaction rates of oxygen, ammonium and nitrate from sediment properties, we provide linear regression coefficients and their uncertainties, enabling access to previous observations that would otherwise remain inaccessible due to missing data. This study provides insights for the development of benthic models that ultimately can be used to assess the impact of anthropogenic pressures on coastal systems. The findings have implications for nutrient management and monitoring in the German Bight, as an improved understanding of sediment reactivity allows for more appropriate and sustainable management and monitoring policies to be implemented.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S027843432300239X/pdfft?md5=e095f508422433fa404bddfde789fe42&pid=1-s2.0-S027843432300239X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138513575","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":"The effect of alongshore wind stress on a buoyancy current’s stability","authors":"K.H. Brink","doi":"10.1016/j.csr.2023.105149","DOIUrl":"10.1016/j.csr.2023.105149","url":null,"abstract":"<div><p>Buoyancy fronts reach from the surface to the bottom over continental shelves, separating light inshore water from denser offshore water, and are known to be responsive to Ekman transport (and associated return flow at depth) driven by alongshore winds. The consequent changes in frontal structure are clearly related to changes in the gravitational Available Potential Energy (<em>APE</em>), so it is reasonable to expect that these winds will affect the eddy field that results from baroclinic instabilities. Idealized numerical experiments and scaling analyses are brought to bear on this problem. It is found that several days of wind-driven downwelling (which creates more nearly vertical isopycnals) generally leads to an enhancement in the time maximum of volume-averaged Eddy Kinetic Energy (<em>EKE</em>). Upwelling-favorable winds (which tend to flatten isopycnals) usually lead to a decrease in <em>APE</em>, hence in eddy energy. The exception to this rule occurs when the winds are strong enough that an upwelling front forms inshore of the buoyant water, in which case <em>APE</em> and <em>EKE</em> may increase.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0278434323002273/pdfft?md5=9bcd4ad401aed5d03376165b7f0ca863&pid=1-s2.0-S0278434323002273-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138513583","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}