Pub Date : 2024-11-04DOI: 10.3389/fmars.2024.1304930
Valérie Chavagnac, Christine Destrigneville, Cédric Boulart, Vincent Taillandier, Nathalie Vigier, Cecile Guieu, Sophie Bonnet
During the TONGA cruise (2019), seawater samples were collected to assess the effect of volcanic eruption versus submarine hydrothermal system on the water column. For this purpose, two locations were investigated, the first one located directly under the influence of the New Late’iki island (eruption in October 2019), and the second one showing ongoing submarine hydrothermal activity. At both locations, the total strontium (TSr) and lithium (TLi) concentrations vary between 94.4 and 152.3 µmol/L and 13.2 and 203.5 µmol/L, respectively. When combined, TSr and TLi concentrations of all samples in the water column are higher than those of the oligotrophic water. Both volcanic eruption and submarine hydrothermal activity (e.g. volcanic ashes, particles, gas condensate) can deliver substantial amount of TSr and TLi to the water column. The distribution of TSr versus TLi evidences linear trends either with a negative or positive slope. The negative correlation is observed in the water column at both sites, directly under the influence of the eruption and in the vicinity of the volcano with hydrothermal activity. The positive TSr versus TLi correlation is observed at site under submarine hydrothermal influence and is in line with black smokers related hydrothermal plumes. The 87Sr/86Sr ratios vary between 0.709147 and 0.709210 and δ7Li values vary between +10.1 and +37.6 ‰. While 92% of the measured 87Sr/86Sr ratios are in line with the mean value of oligotrophic waters, once combined with the δ7Li values, only 20% of them remains within this field. The wide range of δ7Li values decreases from sea-surface down to ~140 mbsl, before increasing at greater depth, while defining different linear trend according to the dissolved inorganic carbon concentrations. The variability of δ7Li values reflect hydrothermal contribution, mineral–seawater interaction and potentially biology–environment interaction. In the particular geological setting of the study, where both hydrothermal and volcanic activities were at play, disentangling both contributions on water column implies a combined use of elemental and isotopic signatures of Sr and Li tracers.
{"title":"Impact of submarine volcanic versus hydrothermal activity onto the strontium and lithium isotopic signatures of the water column (TONGA)","authors":"Valérie Chavagnac, Christine Destrigneville, Cédric Boulart, Vincent Taillandier, Nathalie Vigier, Cecile Guieu, Sophie Bonnet","doi":"10.3389/fmars.2024.1304930","DOIUrl":"https://doi.org/10.3389/fmars.2024.1304930","url":null,"abstract":"During the TONGA cruise (2019), seawater samples were collected to assess the effect of volcanic eruption versus submarine hydrothermal system on the water column. For this purpose, two locations were investigated, the first one located directly under the influence of the New Late’iki island (eruption in October 2019), and the second one showing ongoing submarine hydrothermal activity. At both locations, the total strontium (TSr) and lithium (TLi) concentrations vary between 94.4 and 152.3 µmol/L and 13.2 and 203.5 µmol/L, respectively. When combined, TSr and TLi concentrations of all samples in the water column are higher than those of the oligotrophic water. Both volcanic eruption and submarine hydrothermal activity (e.g. volcanic ashes, particles, gas condensate) can deliver substantial amount of TSr and TLi to the water column. The distribution of TSr versus TLi evidences linear trends either with a negative or positive slope. The negative correlation is observed in the water column at both sites, directly under the influence of the eruption and in the vicinity of the volcano with hydrothermal activity. The positive TSr versus TLi correlation is observed at site under submarine hydrothermal influence and is in line with black smokers related hydrothermal plumes. The <jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr ratios vary between 0.709147 and 0.709210 and δ<jats:sup>7</jats:sup>Li values vary between +10.1 and +37.6 ‰. While 92% of the measured <jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr ratios are in line with the mean value of oligotrophic waters, once combined with the δ<jats:sup>7</jats:sup>Li values, only 20% of them remains within this field. The wide range of δ<jats:sup>7</jats:sup>Li values decreases from sea-surface down to ~140 mbsl, before increasing at greater depth, while defining different linear trend according to the dissolved inorganic carbon concentrations. The variability of δ<jats:sup>7</jats:sup>Li values reflect hydrothermal contribution, mineral–seawater interaction and potentially biology–environment interaction. In the particular geological setting of the study, where both hydrothermal and volcanic activities were at play, disentangling both contributions on water column implies a combined use of elemental and isotopic signatures of Sr and Li tracers.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142574610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Primary production in the Southern Ocean is strongly influenced by the availability of light and iron (Fe). To examine the response of two distinct natural Antarctic phytoplankton communities (diatom vs. flagellates) to increasing light and Fe availability, we conducted two shipboard incubation experiments during late summer and exposed each community to increasing light intensities (30, 80, and 150 µmol photons m−2 s−1) with or without Fe amendment. Our results show clearly that both communities were Fe-limited since Fe addition resulted in higher particulate organic carbon (POC) production rates. The magnitude of the Fe-dependent increase in POC production, however, varied between the two stations being higher in the diatom-dominated community relative to the flagellate-dominated community. This differential response to increasing Fe supply could be attributed to the higher Fe requirement of the flagellate-dominated assemblage relative to the diatom-dominated assemblage. Irrespective of Fe availability, light also strongly stimulated the POC production of both communities between low and medium light supply (30 versus 80 µmol photons m−2 s−1), indicating that both assemblages were light-limited in situ. However, since POC production of both communities did not increase further at the highest light intensity (150 µmol photons m−2 s−1) even under high Fe supply, this suggests that light supply was saturated or that other conditions must be fulfilled (e.g., availability of trace metals other than Fe) in order for the communities to benefit from the higher light and Fe conditions.
{"title":"Distinct responses of diatom- and flagellate-dominated Antarctic phytoplankton communities to altered iron and light supply","authors":"Marianne Camoying, Florian Koch, Jasmin Stimpfle, Franziska Pausch, Christel Hassler, Scarlett Trimborn","doi":"10.3389/fmars.2024.1441087","DOIUrl":"https://doi.org/10.3389/fmars.2024.1441087","url":null,"abstract":"Primary production in the Southern Ocean is strongly influenced by the availability of light and iron (Fe). To examine the response of two distinct natural Antarctic phytoplankton communities (diatom vs. flagellates) to increasing light and Fe availability, we conducted two shipboard incubation experiments during late summer and exposed each community to increasing light intensities (30, 80, and 150 µmol photons m<jats:sup>−2</jats:sup> s<jats:sup>−1</jats:sup>) with or without Fe amendment. Our results show clearly that both communities were Fe-limited since Fe addition resulted in higher particulate organic carbon (POC) production rates. The magnitude of the Fe-dependent increase in POC production, however, varied between the two stations being higher in the diatom-dominated community relative to the flagellate-dominated community. This differential response to increasing Fe supply could be attributed to the higher Fe requirement of the flagellate-dominated assemblage relative to the diatom-dominated assemblage. Irrespective of Fe availability, light also strongly stimulated the POC production of both communities between low and medium light supply (30 versus 80 µmol photons m<jats:sup>−2</jats:sup> s<jats:sup>−1</jats:sup>), indicating that both assemblages were light-limited <jats:italic>in situ</jats:italic>. However, since POC production of both communities did not increase further at the highest light intensity (150 µmol photons m<jats:sup>−2</jats:sup> s<jats:sup>−1</jats:sup>) even under high Fe supply, this suggests that light supply was saturated or that other conditions must be fulfilled (e.g., availability of trace metals other than Fe) in order for the communities to benefit from the higher light and Fe conditions.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142580156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-04DOI: 10.3389/fmars.2024.1419953
K. S. Sreejith, V. V. S. S. Sarma, Sreenivas Pentakota, F. Feba, Ibrahim Hoteit, Karumuri Ashok
IntroductionThis study investigates the biogeochemical impact of Godavari River discharge (GRD) on the Bay of Bengal (BoB), focusing on the formation of an intense and shallow oxygen minimum zone (OMZ) near the river mouth during the fall season. Unlike the BoB’s typical intermediate-depth OMZ, this subsurface (~40-200 m) phenomenon is attributed to the interplay of GRD-driven nutrient enrichment, coastal upwelling, enhanced productivity, and subsequent organic matter decomposition.Data and MethodsOur analysis using the Biogeochemical-Argo floats and World Ocean Atlas 2018 data reveals that a clear shoaling and intensification of the OMZ in the fall season. Further, a comparative analysis at two geographically distinct locations highlighted the pivotal role of GRD.Results, Discussion, and ImplicationsThe location directly influenced by GRD exhibited significantly higher chlorophyll-a blooms, net primary production during the southwest monsoon, and pronounced oxygen consumption during the fall compared to the other. Our analysis suggests that GRD fuels primary productivity, leading to organic matter abundance and intense oxygen depletion in the subsurface layers, driving the observed shallow OMZ. Understanding the complex interplay between GRD, stratification, upwelling, and biogeochemical processes is crucial for predicting the impact of altered riverine inputs on coastal ecosystems, greenhouse gas emissions, and the overall health of the coastal BoB.
{"title":"Seasonal intensification of oxygen minimum zone: linking Godavari River discharge to fall hypoxia in the Bay of Bengal","authors":"K. S. Sreejith, V. V. S. S. Sarma, Sreenivas Pentakota, F. Feba, Ibrahim Hoteit, Karumuri Ashok","doi":"10.3389/fmars.2024.1419953","DOIUrl":"https://doi.org/10.3389/fmars.2024.1419953","url":null,"abstract":"IntroductionThis study investigates the biogeochemical impact of Godavari River discharge (GRD) on the Bay of Bengal (BoB), focusing on the formation of an intense and shallow oxygen minimum zone (OMZ) near the river mouth during the fall season. Unlike the BoB’s typical intermediate-depth OMZ, this subsurface (~40-200 m) phenomenon is attributed to the interplay of GRD-driven nutrient enrichment, coastal upwelling, enhanced productivity, and subsequent organic matter decomposition.Data and MethodsOur analysis using the Biogeochemical-Argo floats and World Ocean Atlas 2018 data reveals that a clear shoaling and intensification of the OMZ in the fall season. Further, a comparative analysis at two geographically distinct locations highlighted the pivotal role of GRD.Results, Discussion, and ImplicationsThe location directly influenced by GRD exhibited significantly higher chlorophyll-a blooms, net primary production during the southwest monsoon, and pronounced oxygen consumption during the fall compared to the other. Our analysis suggests that GRD fuels primary productivity, leading to organic matter abundance and intense oxygen depletion in the subsurface layers, driving the observed shallow OMZ. Understanding the complex interplay between GRD, stratification, upwelling, and biogeochemical processes is crucial for predicting the impact of altered riverine inputs on coastal ecosystems, greenhouse gas emissions, and the overall health of the coastal BoB.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142580151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-04DOI: 10.3389/fmars.2024.1426793
Ling Fang, Eun Jin Yang, Junho Yoo, Minkyoung Kim
Arctic fjords are inherently vulnerable to global warming, particularly because of the substantial freshwater influx resulting from the melting of glaciers. In this study, precipitation, river water, surface ice, and seawater samples from Kongsfjorden were collected to identify the main sources of freshwater. The dual water isotope (δ18O and δD) results and temperature–salinity profiles revealed that between 0% and 7% freshwater contributed to the fjord’s water. Furthermore, different freshwater sources for surface and deep water were identified by the dual water isotope analysis. Turbidity profiles confirmed the alter in particle discharge associated with surface runoff and subglacial discharge. Our study highlighted the sensitivity of water isotope analysis in elucidating the hydrological processes within the fjord system and demonstrated its potential for investigating the impact of meltwater on biological processes in the Arctic.
{"title":"Tracing freshwater sources and particle discharge in Kongsfjorden: insights from a water isotope approach","authors":"Ling Fang, Eun Jin Yang, Junho Yoo, Minkyoung Kim","doi":"10.3389/fmars.2024.1426793","DOIUrl":"https://doi.org/10.3389/fmars.2024.1426793","url":null,"abstract":"Arctic fjords are inherently vulnerable to global warming, particularly because of the substantial freshwater influx resulting from the melting of glaciers. In this study, precipitation, river water, surface ice, and seawater samples from Kongsfjorden were collected to identify the main sources of freshwater. The dual water isotope (δ<jats:sup>18</jats:sup>O and δD) results and temperature–salinity profiles revealed that between 0% and 7% freshwater contributed to the fjord’s water. Furthermore, different freshwater sources for surface and deep water were identified by the dual water isotope analysis. Turbidity profiles confirmed the alter in particle discharge associated with surface runoff and subglacial discharge. Our study highlighted the sensitivity of water isotope analysis in elucidating the hydrological processes within the fjord system and demonstrated its potential for investigating the impact of meltwater on biological processes in the Arctic.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142574606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-04DOI: 10.3389/fmars.2024.1491685
Shaolei Sun, Zhiqi He, Feijun Zhang, Zhiqiang Han
Global climate change has caused rapid temperature changes in marine environments. Understanding how marine organisms respond to temperature changes can help predict their richness of future biodiversity. In this study, we examined the gene expression levels and the difference in the pathways that are responsive to acute temperature stress in low- and high-latitude populations of the shore swimming crab, Charybdis japonica. The two populations of C. japonica were exposed to low- and high-temperature stresses (15°C and 28°C) and used for transcriptome sequencing. Genetic regulatory ability changes were compared to determine the diverse response of the two crab populations to temperature change. The gene expression levels and functional enrichment analysis showed that the low-latitude crab regulated more genes (938) that were mainly enriched in DNA replication and metabolic pathways, whereas the high-latitude crab regulated less genes (309) that were mainly enriched in genetic information processing at low-temperature stress. Furthermore, the low-latitude crab regulated less genes (33) that were mainly enriched in genetic information processing, whereas the high-latitude crab regulated more genes (280) that were mainly enriched in signal transduction and cellular process at high-temperature stress. These results implied that the low-latitude population was more resilient to high-temperature stress, while the high-latitude population was more resilient to low-temperature stress. This study enhances our understanding of how different geographic C. japonica populations respond to varying temperature environments in their living zone, which could be helpful for predicting future biodiversity trends of intertidal crustaceans under global climate change.
{"title":"Comparative transcriptome analysis of low- and high-latitude populations of Charybdis japonica under temperature stress","authors":"Shaolei Sun, Zhiqi He, Feijun Zhang, Zhiqiang Han","doi":"10.3389/fmars.2024.1491685","DOIUrl":"https://doi.org/10.3389/fmars.2024.1491685","url":null,"abstract":"Global climate change has caused rapid temperature changes in marine environments. Understanding how marine organisms respond to temperature changes can help predict their richness of future biodiversity. In this study, we examined the gene expression levels and the difference in the pathways that are responsive to acute temperature stress in low- and high-latitude populations of the shore swimming crab, <jats:italic>Charybdis japonica</jats:italic>. The two populations of <jats:italic>C. japonica</jats:italic> were exposed to low- and high-temperature stresses (15°C and 28°C) and used for transcriptome sequencing. Genetic regulatory ability changes were compared to determine the diverse response of the two crab populations to temperature change. The gene expression levels and functional enrichment analysis showed that the low-latitude crab regulated more genes (938) that were mainly enriched in DNA replication and metabolic pathways, whereas the high-latitude crab regulated less genes (309) that were mainly enriched in genetic information processing at low-temperature stress. Furthermore, the low-latitude crab regulated less genes (33) that were mainly enriched in genetic information processing, whereas the high-latitude crab regulated more genes (280) that were mainly enriched in signal transduction and cellular process at high-temperature stress. These results implied that the low-latitude population was more resilient to high-temperature stress, while the high-latitude population was more resilient to low-temperature stress. This study enhances our understanding of how different geographic <jats:italic>C. japonica</jats:italic> populations respond to varying temperature environments in their living zone, which could be helpful for predicting future biodiversity trends of intertidal crustaceans under global climate change.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142574605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-04DOI: 10.3389/fmars.2024.1481047
Duo Chen, Zewen Zheng, Ziquan Zhou, Yuxin Song, Zhi Chen, Gang Lin, Ting Xue
Oysters, particularly Portuguese oyster (Crassostrea angulata), are highly valued for their nutritional and flavor qualities, making them important in global aquaculture. Triploid oysters have gained attention for maintaining higher meat quality year-round compared to diploids, but there is limited research on how ploidy affects their biochemical and flavor profiles. This study uses a non-targeted metabolomics approach, including gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS), to investigate flavor substance differences between triploid and diploid C. angulata. A total of 13 volatile compounds were identified in diploid oysters, while 28 were found in triploids. Significant upregulation of inosine, guanosine, L-aspartic acid, and taurine in triploids contributes to their enhanced flavor profile. Additionally, triploids showed higher nicotinamide concentrations, while diploids had increased 25-hydroxycholesterol. These findings highlight the advantages of triploid oysters in aquaculture for improved flavor and nutrition, supporting their potential for year-round production.
牡蛎，尤其是葡萄牙牡蛎（Crassostrea angulata），因其营养和风味品质而备受青睐，在全球水产养殖业中占有重要地位。与二倍体牡蛎相比，三倍体牡蛎常年保持较高的肉质，因而备受关注，但有关倍性如何影响其生化和风味特征的研究却很有限。本研究采用非靶向代谢组学方法，包括气相色谱-质谱联用仪（GC-MS）和液相色谱-质谱联用仪（LC-MS），研究三倍体和二倍体 C. angulata 的风味物质差异。在二倍体牡蛎中发现了 13 种挥发性化合物，而在三倍体牡蛎中发现了 28 种挥发性化合物。三倍体中肌苷、鸟苷、L-天冬氨酸和牛磺酸的含量显著增加，这也是它们风味更佳的原因。此外，三倍体的烟酰胺浓度更高，而二倍体的 25-羟基胆固醇含量更高。这些发现强调了三倍体牡蛎在水产养殖中改善风味和营养的优势，支持其全年生产的潜力。
{"title":"Application of metabolomics approach to investigate the flavor substance differences between triploid and diploid oysters (Crassostrea angulata)","authors":"Duo Chen, Zewen Zheng, Ziquan Zhou, Yuxin Song, Zhi Chen, Gang Lin, Ting Xue","doi":"10.3389/fmars.2024.1481047","DOIUrl":"https://doi.org/10.3389/fmars.2024.1481047","url":null,"abstract":"Oysters, particularly Portuguese oyster (<jats:italic>Crassostrea angulata</jats:italic>), are highly valued for their nutritional and flavor qualities, making them important in global aquaculture. Triploid oysters have gained attention for maintaining higher meat quality year-round compared to diploids, but there is limited research on how ploidy affects their biochemical and flavor profiles. This study uses a non-targeted metabolomics approach, including gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS), to investigate flavor substance differences between triploid and diploid <jats:italic>C. angulata</jats:italic>. A total of 13 volatile compounds were identified in diploid oysters, while 28 were found in triploids. Significant upregulation of inosine, guanosine, L-aspartic acid, and taurine in triploids contributes to their enhanced flavor profile. Additionally, triploids showed higher nicotinamide concentrations, while diploids had increased 25-hydroxycholesterol. These findings highlight the advantages of triploid oysters in aquaculture for improved flavor and nutrition, supporting their potential for year-round production.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142574638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-04DOI: 10.3389/fmars.2024.1409689
Baris Salihoglu, Mustafa Yücel, Pinar Uygurer, Ezgi Şahin Yücel, Evangelos Papathanassiou, Devrim Tezcan, Adrian Stanica, Irina Stanciu, Snejana Petrova Moncheva, Nina Dzhembekova, Kremena Blagovestova Stefanova, Viktor Komorin, Tudor Castravet, Kakhaber Bilashvili, Valerian Melikidze, Mamuka Gvilava, Salome Kobaidze
The Black Sea is a vital resource with vast potential to boost the societal value of the Blue Economy for its surrounding countries. Improved knowledge and enhanced infrastructure together with better coordination and alignment of research and innovation efforts are critical for the better management of the deteriorated Black Sea ecosystem to help restore and maintain its resilience and enable sustainable use of natural resources. In 2019, the Black Sea Strategic Research and Innovation Agenda (Black Sea SRIA), was developed by the Black Sea experts, in cooperation with European marine institutes and organizations, with the support of the European Commission. Black Sea SRIA presents the priorities and ecosystem-based management options needed for a healthy, sustainable, and resilient Black Sea. Since 2019, efforts focused on developing concrete actions under the Black Sea SRIA Implementation Plan (IP) to contribute to the national blue economy strategies, better structuring of the relevant funding mechanisms for solution-oriented implementation and the international and regional strategies, supporting the co-funding mechanisms. In this study, we present a transnational process that has led to the development of the IP which utilized a bottom-up, co-design and co-creation-based approach. The SRIA and its IP support better governance of the blue economy principles towards sustainable development and conservation of unique Black Sea ecosystems. The Black Sea SRIA and IP address the fundamental research challenges of the region, promote the blue economy, and also build vital support systems and innovative research infrastructure and capacity together with academia, funding organizations, industry, policy, civil society and local communities. The IP is a long-lasting guide to catalyze new ideas and innovations towards and with the Black Sea community with strong implications for other sea basins.
黑海是一种重要的资源，具有巨大的潜力来提高其周边国家蓝色经济的社会价值。增进知识、加强基础设施、更好地协调和调整研究与创新工作，对于更好地管理日益恶化的黑海生态系统，帮助恢复和保持其复原力，实现自然资源的可持续利用至关重要。2019 年，在欧盟委员会的支持下，黑海专家与欧洲海洋研究所和组织合作制定了《黑海战略研究与创新议程》（Black Sea SRIA）。黑海战略研究与创新议程》提出了健康、可持续和具有复原力的黑海所需的优先事项和基于生态系统的管理方案。自 2019 年以来，工作重点是根据《黑海 SRIA 实施计划》（IP）制定具体行动，以促进国家蓝色经济战略，更好地构建以解决方案为导向的相关筹资机制，以及国际和区域战略，支持共同筹资机制。在本研究中，我们介绍了制定 IP 的跨国过程，该过程采用了自下而上、共同设计和共同创造的方法。SRIA 及其 IP 支持更好地管理蓝色经济原则，以实现可持续发展和保护独特的黑海生态系统。黑海区域创新与影响评估》和 IP 解决了该地区的基本研究挑战，促进了蓝色经济，并与学 术界、资助组织、行业、政策、民间社会和当地社区一起建立了重要的支持系统和创新研究 基础设施与能力。综合方案是一个长期指导方案，旨在促进面向黑海社区的新思路和创新，并对其他海盆产生重大影响。
{"title":"Implementing regional blue economy research and innovation strategies: a case study for the Black Sea","authors":"Baris Salihoglu, Mustafa Yücel, Pinar Uygurer, Ezgi Şahin Yücel, Evangelos Papathanassiou, Devrim Tezcan, Adrian Stanica, Irina Stanciu, Snejana Petrova Moncheva, Nina Dzhembekova, Kremena Blagovestova Stefanova, Viktor Komorin, Tudor Castravet, Kakhaber Bilashvili, Valerian Melikidze, Mamuka Gvilava, Salome Kobaidze","doi":"10.3389/fmars.2024.1409689","DOIUrl":"https://doi.org/10.3389/fmars.2024.1409689","url":null,"abstract":"The Black Sea is a vital resource with vast potential to boost the societal value of the Blue Economy for its surrounding countries. Improved knowledge and enhanced infrastructure together with better coordination and alignment of research and innovation efforts are critical for the better management of the deteriorated Black Sea ecosystem to help restore and maintain its resilience and enable sustainable use of natural resources. In 2019, the Black Sea Strategic Research and Innovation Agenda (Black Sea SRIA), was developed by the Black Sea experts, in cooperation with European marine institutes and organizations, with the support of the European Commission. Black Sea SRIA presents the priorities and ecosystem-based management options needed for a healthy, sustainable, and resilient Black Sea. Since 2019, efforts focused on developing concrete actions under the Black Sea SRIA Implementation Plan (IP) to contribute to the national blue economy strategies, better structuring of the relevant funding mechanisms for solution-oriented implementation and the international and regional strategies, supporting the co-funding mechanisms. In this study, we present a transnational process that has led to the development of the IP which utilized a bottom-up, co-design and co-creation-based approach. The SRIA and its IP support better governance of the blue economy principles towards sustainable development and conservation of unique Black Sea ecosystems. The Black Sea SRIA and IP address the fundamental research challenges of the region, promote the blue economy, and also build vital support systems and innovative research infrastructure and capacity together with academia, funding organizations, industry, policy, civil society and local communities. The IP is a long-lasting guide to catalyze new ideas and innovations towards and with the Black Sea community with strong implications for other sea basins.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142574607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-04DOI: 10.3389/fmars.2024.1449548
Mirae Kim, Jaeho Song, Seung Yeol Shin, Kazuhiro Kogure, Ilnam Kang, Jang-Cheon Cho
Despite previous culture-independent studies highlighting the prevalence of the order Burkholderiales in deep-sea environments, the cultivation and characterization of deep-sea Burkholderiales have been infrequent. A total of 243 deep-sea bacterial strains were isolated from various depths in the Northwest Pacific Ocean, with 33 isolates (13.6%) from a depth of 4000 m classified into Burkholderiales. Herein, we report the isolation and genome characteristics of strain SAORIC-580T, from a depth of 4000 m in the Northwest Pacific Ocean. The strain showed a close phylogenetic relationship with Limnobacter thiooxidans CS-K2T, sharing 99.9% 16S rRNA gene sequence identity. The complete whole-genome sequence of strain SAORIC-580T comprised 3.3 Mbp with a DNA G+C content of 52.5%. Comparative genomic analysis revealed average nucleotide identities between 79.4–85.7% and digital DNA-DNA hybridization values of 19.9–29.5% when compared to other Limnobacter genomes, indicating that the strain represents a novel species within the genus. Genomic analysis revealed unique adaptations to deep-sea conditions, including genes associated with phenol degradation, stress responses, cold adaptation, heavy metal resistance, signal transduction, and carbohydrate metabolism. The SAORIC-580T genome was found to be more abundant in the deep sea than at the surface in the trenches of the Northwest Pacific Ocean, suggesting adaptations to the deep-sea environment. Phenotypic characterization highlighted distinct differences from other Limnobacter species, including variations in growth conditions, enzyme activities, and phenol degradation capabilities. Chemotaxonomic markers of the strain included ubiquinone-10, major fatty acids such as C16:0, C16:1, and C18:1, and major polar lipids including phosphatidylethanolamine, phosphatidylglycerol, and diphosphatidylglycerol. Based on the polyphasic taxonomic data, it is concluded that strain SAORIC-580T (= KACC 21440T = NBRC 114111T) represents a novel species, for which the name Limnobacter profundi sp. nov. is proposed.
{"title":"Cultivation of deep-sea bacteria from the Northwest Pacific Ocean and characterization of Limnobacter profundi sp. nov., a phenol-degrading bacterium","authors":"Mirae Kim, Jaeho Song, Seung Yeol Shin, Kazuhiro Kogure, Ilnam Kang, Jang-Cheon Cho","doi":"10.3389/fmars.2024.1449548","DOIUrl":"https://doi.org/10.3389/fmars.2024.1449548","url":null,"abstract":"Despite previous culture-independent studies highlighting the prevalence of the order <jats:italic>Burkholderiales</jats:italic> in deep-sea environments, the cultivation and characterization of deep-sea <jats:italic>Burkholderiales</jats:italic> have been infrequent. A total of 243 deep-sea bacterial strains were isolated from various depths in the Northwest Pacific Ocean, with 33 isolates (13.6%) from a depth of 4000 m classified into <jats:italic>Burkholderiales.</jats:italic> Herein, we report the isolation and genome characteristics of strain SAORIC-580<jats:sup>T</jats:sup>, from a depth of 4000 m in the Northwest Pacific Ocean. The strain showed a close phylogenetic relationship with <jats:italic>Limnobacter thiooxidans</jats:italic> CS-K2<jats:sup>T</jats:sup>, sharing 99.9% 16S rRNA gene sequence identity. The complete whole-genome sequence of strain SAORIC-580<jats:sup>T</jats:sup> comprised 3.3 Mbp with a DNA G+C content of 52.5%. Comparative genomic analysis revealed average nucleotide identities between 79.4–85.7% and digital DNA-DNA hybridization values of 19.9–29.5% when compared to other <jats:italic>Limnobacter</jats:italic> genomes, indicating that the strain represents a novel species within the genus. Genomic analysis revealed unique adaptations to deep-sea conditions, including genes associated with phenol degradation, stress responses, cold adaptation, heavy metal resistance, signal transduction, and carbohydrate metabolism. The SAORIC-580<jats:sup>T</jats:sup> genome was found to be more abundant in the deep sea than at the surface in the trenches of the Northwest Pacific Ocean, suggesting adaptations to the deep-sea environment. Phenotypic characterization highlighted distinct differences from other <jats:italic>Limnobacter</jats:italic> species, including variations in growth conditions, enzyme activities, and phenol degradation capabilities. Chemotaxonomic markers of the strain included ubiquinone-10, major fatty acids such as C<jats:sub>16:0</jats:sub>, C<jats:sub>16:1</jats:sub>, and C<jats:sub>18:1</jats:sub>, and major polar lipids including phosphatidylethanolamine, phosphatidylglycerol, and diphosphatidylglycerol. Based on the polyphasic taxonomic data, it is concluded that strain SAORIC-580<jats:sup>T</jats:sup> (= KACC 21440<jats:sup>T</jats:sup> = NBRC 114111<jats:sup>T</jats:sup>) represents a novel species, for which the name <jats:italic>Limnobacter profundi</jats:italic> sp. nov. is proposed.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142574609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-01DOI: 10.3389/fmars.2024.1427595
Jennifer L. Ruesink, Katie Houle, Kristy J. Kroeker, Brett R. Dumbauld, Fiona C. Boardman, Nathaniel S. Lewis, Brooke A. McIntyre, Andrew D. Suhrbier, Bobbi Hudson
Species persist through resistance and recovery traits induced by natural stressors. Whether human activities exacerbate or moderate the effects of natural stressors is an open question. Because eelgrass (Zostera marina) creates coastal habitat, its response to natural stressors and human activities is of particular management importance. In this study, traits of intertidal eelgrass were examined across cumulative stressors of emersion and oyster culture, including two culture types: oysters grown directly on sediment (ground culture) or supported by gear above the sediment (off-bottom culture). Summer eelgrass was larger above- and below-ground and branched less than in spring, while density and cover were similar seasonally but declined at higher elevation and in ground culture. Eelgrass traits were divided into those related to resistance (larger above-ground size and below-ground storage) and recovery (increased flowering, branching, and rhizome extension). Resistance traits responded additively to intertidal elevation and oyster culture, with above- and below-ground size reduced in all conditions except that rhizome mass was maintained in ground culture. Smaller above-ground size may confer resistance to emersion stress, as a departure from expectations for other stressors. For resilience traits, flowering increased and internode length declined at higher elevation, whereas these traits did not change in ground culture, and off-bottom culture was associated with shorter internodes (additive cumulative stressor) and tended to moderate the enhanced flowering at higher elevations (non-additive, P=0.058). Transitory disturbance in ground culture may reduce eelgrass density with few effects on resilience, whereas off-bottom culture involves longer-term gear placement and trait responses by eelgrass.
{"title":"Intraspecific variation in resilience traits of eelgrass across intertidal stress gradients and oyster aquaculture methods","authors":"Jennifer L. Ruesink, Katie Houle, Kristy J. Kroeker, Brett R. Dumbauld, Fiona C. Boardman, Nathaniel S. Lewis, Brooke A. McIntyre, Andrew D. Suhrbier, Bobbi Hudson","doi":"10.3389/fmars.2024.1427595","DOIUrl":"https://doi.org/10.3389/fmars.2024.1427595","url":null,"abstract":"Species persist through resistance and recovery traits induced by natural stressors. Whether human activities exacerbate or moderate the effects of natural stressors is an open question. Because eelgrass (<jats:italic>Zostera marina</jats:italic>) creates coastal habitat, its response to natural stressors and human activities is of particular management importance. In this study, traits of intertidal eelgrass were examined across cumulative stressors of emersion and oyster culture, including two culture types: oysters grown directly on sediment (ground culture) or supported by gear above the sediment (off-bottom culture). Summer eelgrass was larger above- and below-ground and branched less than in spring, while density and cover were similar seasonally but declined at higher elevation and in ground culture. Eelgrass traits were divided into those related to resistance (larger above-ground size and below-ground storage) and recovery (increased flowering, branching, and rhizome extension). Resistance traits responded additively to intertidal elevation and oyster culture, with above- and below-ground size reduced in all conditions except that rhizome mass was maintained in ground culture. Smaller above-ground size may confer resistance to emersion stress, as a departure from expectations for other stressors. For resilience traits, flowering increased and internode length declined at higher elevation, whereas these traits did not change in ground culture, and off-bottom culture was associated with shorter internodes (additive cumulative stressor) and tended to moderate the enhanced flowering at higher elevations (non-additive, P=0.058). Transitory disturbance in ground culture may reduce eelgrass density with few effects on resilience, whereas off-bottom culture involves longer-term gear placement and trait responses by eelgrass.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142563041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-01DOI: 10.3389/fmars.2024.1466072
Jiang Gui, Jun Sun
The cellular carbon content and chlorophyll a (Chl a) concentration are two of the most significant indices for assessing phytoplankton biomass. Recording and monitoring these biomasses are essential tasks in phytoplankton research, and the carbon-to-chlorophyll a (C:Chl a) ratio serves as a crucial conversion tool between them. Although the C:Chl a ratio varies widely, it is influenced by external environmental factors, making modeling studies of C:Chl a particularly important. This paper provides an overview of the historical development of the C:Chl a model, beginning with early empirical models and progressing to the development of mechanistic models. This discussion is followed by an examination of existing gaps and future challenges in current C:Chl a modeling, particularly the potential underestimation of carbon biomass in existing C:Chl a models for dinoflagellates exhibiting multiple growth strategies. Finally, it is suggested that future C:Chl a models should strive to achieve a balance between reliability and applicability.
细胞碳含量和叶绿素 a（Chl a）浓度是评估浮游植物生物量的两个最重要指标。记录和监测这些生物量是浮游植物研究的基本任务，而碳-叶绿素 a（C:Chl a）比率则是它们之间的重要转换工具。虽然碳-叶绿素 a 比率变化很大，但它受外部环境因素的影响也很大，因此对碳-叶绿素 a 比率的建模研究尤为重要。本文概述了 C:Chl a 模型的历史发展，从早期的经验模型开始，逐步发展到机理模型。在讨论之后，研究了当前 C:Chl a 模型的现有差距和未来挑战，特别是现有 C:Chl a 模型可能低估了表现出多种生长策略的甲藻的碳生物量。最后，建议未来的 C:Chl a 模型应努力实现可靠性与适用性之间的平衡。
{"title":"Phytoplankton carbon to chlorophyll a model development: a review","authors":"Jiang Gui, Jun Sun","doi":"10.3389/fmars.2024.1466072","DOIUrl":"https://doi.org/10.3389/fmars.2024.1466072","url":null,"abstract":"The cellular carbon content and chlorophyll a (Chl <jats:italic>a</jats:italic>) concentration are two of the most significant indices for assessing phytoplankton biomass. Recording and monitoring these biomasses are essential tasks in phytoplankton research, and the carbon-to-chlorophyll a (C:Chl <jats:italic>a</jats:italic>) ratio serves as a crucial conversion tool between them. Although the C:Chl <jats:italic>a</jats:italic> ratio varies widely, it is influenced by external environmental factors, making modeling studies of C:Chl <jats:italic>a</jats:italic> particularly important. This paper provides an overview of the historical development of the C:Chl <jats:italic>a</jats:italic> model, beginning with early empirical models and progressing to the development of mechanistic models. This discussion is followed by an examination of existing gaps and future challenges in current C:Chl <jats:italic>a</jats:italic> modeling, particularly the potential underestimation of carbon biomass in existing C:Chl <jats:italic>a</jats:italic> models for dinoflagellates exhibiting multiple growth strategies. Finally, it is suggested that future C:Chl <jats:italic>a</jats:italic> models should strive to achieve a balance between reliability and applicability.","PeriodicalId":12479,"journal":{"name":"Frontiers in Marine Science","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142563044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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