Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
    - GEOPHYSICS (33 journals)
    - HYDROLOGY (29 journals)
    - OCEANOGRAPHY (88 journals)

EARTH SCIENCES (527 journals)                  1 2 3 | Last

Showing 1 - 200 of 371 Journals sorted by number of followers
Nature Geoscience     Full-text available via subscription   (Followers: 162)
IEEE Geoscience and Remote Sensing Letters     Hybrid Journal   (Followers: 151)
International Journal of Remote Sensing     Hybrid Journal   (Followers: 144)
Earth and Planetary Science Letters     Hybrid Journal   (Followers: 143)
Journal of Atmospheric and Solar-Terrestrial Physics     Hybrid Journal   (Followers: 133)
Journal of the Atmospheric Sciences     Hybrid Journal   (Followers: 83)
Ocean & Coastal Management     Hybrid Journal   (Followers: 62)
Marine Policy     Hybrid Journal   (Followers: 61)
International Journal of Geographical Information Science     Hybrid Journal   (Followers: 55)
Geochimica et Cosmochimica Acta     Hybrid Journal   (Followers: 54)
ICES Journal of Marine Science: Journal du Conseil     Hybrid Journal   (Followers: 53)
Natural Hazards     Hybrid Journal   (Followers: 53)
Journal of Earth System Science     Open Access   (Followers: 52)
Aquatic Conservation Marine and Freshwater Ecosystems     Hybrid Journal   (Followers: 44)
Hydrological Processes     Hybrid Journal   (Followers: 44)
Estuarine, Coastal and Shelf Science     Hybrid Journal   (Followers: 41)
Geophysical Journal International     Hybrid Journal   (Followers: 40)
Journal of Hydrologic Engineering     Full-text available via subscription   (Followers: 40)
Groundwater     Hybrid Journal   (Followers: 37)
International Journal of Earth Sciences     Hybrid Journal   (Followers: 37)
International Journal of Applied Earth Observation and Geoinformation     Open Access   (Followers: 36)
Physics of the Earth and Planetary Interiors     Hybrid Journal   (Followers: 34)
Journal of Atmospheric and Oceanic Technology     Hybrid Journal   (Followers: 33)
Geomorphology     Hybrid Journal   (Followers: 33)
Chemical Geology     Hybrid Journal   (Followers: 31)
Marine Geology     Hybrid Journal   (Followers: 31)
Geology Today     Hybrid Journal   (Followers: 31)
Marine Environmental Research     Hybrid Journal   (Followers: 31)
Journal of Quaternary Science     Hybrid Journal   (Followers: 31)
Reviews of Modern Physics     Full-text available via subscription   (Followers: 30)
Journal of Geotechnical and Geoenvironmental Engineering     Full-text available via subscription   (Followers: 30)
Journal of Geology     Full-text available via subscription   (Followers: 30)
Coastal Management     Hybrid Journal   (Followers: 29)
Advances In Physics     Hybrid Journal   (Followers: 29)
GPS Solutions     Hybrid Journal   (Followers: 28)
Bulletin of the Seismological Society of America     Full-text available via subscription   (Followers: 26)
Landslides     Hybrid Journal   (Followers: 26)
Journal of Structural Geology     Hybrid Journal   (Followers: 26)
Quaternary Science Reviews     Hybrid Journal   (Followers: 26)
Ground Water Monitoring & Remediation     Hybrid Journal   (Followers: 25)
Geoforum     Hybrid Journal   (Followers: 25)
Earth Surface Processes and Landforms     Hybrid Journal   (Followers: 25)
Environmental Geology     Hybrid Journal   (Followers: 25)
Tectonophysics     Hybrid Journal   (Followers: 24)
Geocarto International     Hybrid Journal   (Followers: 23)
Coral Reefs     Hybrid Journal   (Followers: 22)
Bulletin of Volcanology     Hybrid Journal   (Followers: 22)
Hydrogeology Journal     Hybrid Journal   (Followers: 21)
Hydrobiologia     Hybrid Journal   (Followers: 21)
Tellus A     Open Access   (Followers: 21)
Marine and Petroleum Geology     Hybrid Journal   (Followers: 21)
Water Resources     Hybrid Journal   (Followers: 21)
Journal of Plasma Physics     Hybrid Journal   (Followers: 21)
Earthquake Spectra     Hybrid Journal   (Followers: 20)
Tellus B     Open Access   (Followers: 20)
Journal of Marine Research     Full-text available via subscription   (Followers: 20)
Sedimentary Geology     Hybrid Journal   (Followers: 20)
Dynamics of Atmospheres and Oceans     Hybrid Journal   (Followers: 19)
Geophysics     Full-text available via subscription   (Followers: 19)
Quaternary Research     Full-text available via subscription   (Followers: 19)
Geological Journal     Hybrid Journal   (Followers: 19)
Global and Planetary Change     Hybrid Journal   (Followers: 18)
Physics of Metals and Metallography     Hybrid Journal   (Followers: 18)
African Journal of Aquatic Science     Hybrid Journal   (Followers: 17)
Computational Geosciences     Hybrid Journal   (Followers: 17)
Journal of Volcanology and Geothermal Research     Hybrid Journal   (Followers: 17)
Natural Hazards Review     Full-text available via subscription   (Followers: 16)
Geological Magazine     Hybrid Journal   (Followers: 16)
The Holocene     Hybrid Journal   (Followers: 16)
Atmosphere-Ocean     Full-text available via subscription   (Followers: 16)
Journal of Metamorphic Geology     Hybrid Journal   (Followers: 15)
Journal of Applied Geophysics     Hybrid Journal   (Followers: 15)
Journal of Asian Earth Sciences     Hybrid Journal   (Followers: 15)
Sedimentology     Hybrid Journal   (Followers: 15)
Ocean Development & International Law     Hybrid Journal   (Followers: 15)
Applied Geochemistry     Hybrid Journal   (Followers: 14)
Quaternary International     Hybrid Journal   (Followers: 14)
Journal of the World Aquaculture Society     Hybrid Journal   (Followers: 13)
Journal of Hydro-environment Research     Full-text available via subscription   (Followers: 13)
Pramana     Open Access   (Followers: 13)
Soil Dynamics and Earthquake Engineering     Hybrid Journal   (Followers: 13)
Electromagnetics     Hybrid Journal   (Followers: 13)
Ocean Modelling     Hybrid Journal   (Followers: 12)
European Journal of Mineralogy     Hybrid Journal   (Followers: 12)
Frontiers of Earth Science     Hybrid Journal   (Followers: 12)
Continental Shelf Research     Hybrid Journal   (Followers: 12)
Computers and Geotechnics     Hybrid Journal   (Followers: 12)
Arctic, Antarctic, and Alpine Research     Open Access   (Followers: 12)
Pure and Applied Geophysics     Hybrid Journal   (Followers: 12)
CATENA     Hybrid Journal   (Followers: 11)
Journal of Petrology     Hybrid Journal   (Followers: 11)
Ore Geology Reviews     Hybrid Journal   (Followers: 11)
Contributions to Mineralogy and Petrology     Hybrid Journal   (Followers: 11)
Applied Geophysics     Hybrid Journal   (Followers: 11)
Journal of African Earth Sciences     Hybrid Journal   (Followers: 11)
IEEE Journal of Oceanic Engineering     Hybrid Journal   (Followers: 11)
Marine Mammal Science     Hybrid Journal   (Followers: 10)
Cretaceous Research     Hybrid Journal   (Followers: 10)
Earth Interactions     Open Access   (Followers: 10)
Australian Journal of Earth Sciences: An International Geoscience Journal of the Geological Society of Australia     Hybrid Journal   (Followers: 10)
Bulletin of Earthquake Engineering     Hybrid Journal   (Followers: 10)
Gondwana Research     Hybrid Journal   (Followers: 10)
Physics of Plasmas     Hybrid Journal   (Followers: 10)
Journal of Seismology     Hybrid Journal   (Followers: 9)
Physik in unserer Zeit     Hybrid Journal   (Followers: 9)
Lithos     Hybrid Journal   (Followers: 9)
Limnology     Hybrid Journal   (Followers: 9)
Acta Geophysica     Hybrid Journal   (Followers: 9)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 9)
Journal of Marine Systems     Hybrid Journal   (Followers: 9)
Geotectonics     Hybrid Journal   (Followers: 9)
Facies     Hybrid Journal   (Followers: 9)
Comptes Rendus : Geoscience     Open Access   (Followers: 9)
Journal of Geodesy     Hybrid Journal   (Followers: 9)
Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards     Hybrid Journal   (Followers: 8)
Geophysical & Astrophysical Fluid Dynamics     Hybrid Journal   (Followers: 8)
Natural Resources Research     Hybrid Journal   (Followers: 8)
Geobiology     Hybrid Journal   (Followers: 8)
Quaternary Geochronology     Hybrid Journal   (Followers: 8)
Earthquake Engineering and Engineering Vibration     Hybrid Journal   (Followers: 8)
Geophysical Prospecting     Hybrid Journal   (Followers: 7)
Journal of Systematic Palaeontology     Hybrid Journal   (Followers: 7)
Physics of the Solid State     Hybrid Journal   (Followers: 7)
Plasma Physics Reports     Hybrid Journal   (Followers: 7)
Precambrian Research     Hybrid Journal   (Followers: 7)
Ocean Engineering     Hybrid Journal   (Followers: 6)
Petrology     Full-text available via subscription   (Followers: 6)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Journal of Sea Research     Hybrid Journal   (Followers: 6)
Geochemistry : Exploration, Environment, Analysis     Hybrid Journal   (Followers: 6)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Geo-Marine Letters     Hybrid Journal   (Followers: 6)
Journal of Coastal Conservation     Hybrid Journal   (Followers: 6)
Applied Ocean Research     Hybrid Journal   (Followers: 6)
Rock Mechanics and Rock Engineering     Hybrid Journal   (Followers: 6)
Chinese Geographical Science     Hybrid Journal   (Followers: 6)
Journal of Geodynamics     Hybrid Journal   (Followers: 6)
Resource Geology     Hybrid Journal   (Followers: 6)
Marine and Freshwater Research     Hybrid Journal   (Followers: 6)
Ocean Dynamics     Hybrid Journal   (Followers: 6)
International Journal of Geomechanics     Full-text available via subscription   (Followers: 6)
Island Arc     Hybrid Journal   (Followers: 5)
Geofluids     Open Access   (Followers: 5)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 5)
Marine Geophysical Researches     Hybrid Journal   (Followers: 5)
Geochemistry     Hybrid Journal   (Followers: 5)
Permafrost and Periglacial Processes     Hybrid Journal   (Followers: 5)
Zeitschrift für Geomorphologie     Full-text available via subscription   (Followers: 5)
Terra Nova     Hybrid Journal   (Followers: 5)
Energy Exploration & Exploitation     Open Access   (Followers: 4)
Organic Geochemistry     Hybrid Journal   (Followers: 4)
Mineralium Deposita     Hybrid Journal   (Followers: 4)
Marine Geodesy     Hybrid Journal   (Followers: 4)
Limnologica     Hybrid Journal   (Followers: 4)
Meteorologische Zeitschrift     Full-text available via subscription   (Followers: 4)
Letters in Mathematical Physics     Hybrid Journal   (Followers: 4)
Geostandards and Geoanalytical Research     Hybrid Journal   (Followers: 3)
Surveys in Geophysics     Hybrid Journal   (Followers: 3)
Lithology and Mineral Resources     Hybrid Journal   (Followers: 3)
Russian Geology and Geophysics     Hybrid Journal   (Followers: 3)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 3)
JETP Letters     Hybrid Journal   (Followers: 3)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 3)
Fundamental and Applied Limnology / Archiv für Hydrobiologie     Full-text available via subscription   (Followers: 3)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 3)
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen     Full-text available via subscription   (Followers: 3)
Geomagnetism and Aeronomy     Hybrid Journal   (Followers: 3)
Journal of Petroleum Science and Engineering     Hybrid Journal   (Followers: 3)
Journal of Marine Science and Technology     Hybrid Journal   (Followers: 3)
Zeitschrift der Deutschen Gesellschaft für Geowissenschaften     Full-text available via subscription   (Followers: 3)
Stratigraphy and Geological Correlation     Full-text available via subscription   (Followers: 2)
Annales Henri Poincaré     Hybrid Journal   (Followers: 2)
Rocks & Minerals     Hybrid Journal   (Followers: 2)
Newsletters on Stratigraphy     Full-text available via subscription   (Followers: 2)
Polar Record     Hybrid Journal   (Followers: 2)
Mineralogy and Petrology     Hybrid Journal   (Followers: 2)
International Journal of Coal Geology     Hybrid Journal   (Followers: 2)
Helgoland Marine Research     Open Access   (Followers: 2)
Journal of Geophysics and Engineering     Hybrid Journal   (Followers: 2)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Journal of Mining Science     Hybrid Journal   (Followers: 2)
Studia Geophysica et Geodaetica     Hybrid Journal   (Followers: 1)
The Leading Edge     Hybrid Journal   (Followers: 1)
Izvestiya, Atmospheric and Oceanic Physics     Full-text available via subscription   (Followers: 1)
Doklady Physics     Hybrid Journal   (Followers: 1)
Russian Physics Journal     Hybrid Journal   (Followers: 1)
Reports on Mathematical Physics     Full-text available via subscription   (Followers: 1)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 1)
Physics of Life Reviews     Hybrid Journal   (Followers: 1)
Neues Jahrbuch für Mineralogie - Abhandlungen     Full-text available via subscription   (Followers: 1)
Russian Journal of Pacific Geology     Hybrid Journal  
Russian Journal of Mathematical Physics     Full-text available via subscription  
Physics of Wave Phenomena     Hybrid Journal  
Moscow University Physics Bulletin     Hybrid Journal  
Moscow University Geology Bulletin     Hybrid Journal  
Marine Georesources & Geotechnology     Hybrid Journal  
Journal of Mountain Science     Hybrid Journal  
Grassland Science     Hybrid Journal  
Erwerbs-Obstbau     Hybrid Journal  
Bulletin of the Lebedev Physics Institute     Hybrid Journal  

        1 2 3 | Last

Similar Journals
Journal Cover
Journal of Oceanology and Limnology
Journal Prestige (SJR): 0.301
Citation Impact (citeScore): 1
Number of Followers: 3  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2096-5508 - ISSN (Online) 2523-3521
Published by Springer-Verlag Homepage  [2469 journals]
  • Characterization of subduction initiation

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      Abstract: Abstract Compression is required for all kinds of subduction initiations, which may cause either subsidence or uplift, depending on the ages of the oceanic plates. Subduction initiations associated with the old oceanic crust tend to amplify preexisting subsidence by compression, whereas those associated with young oceanic plates may result in uplift.
      PubDate: 2022-04-29
       
  • The key environmental factors driving the succession of phytoplankton
           functional groups in Hongfeng Reservoir, southwest China

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      Abstract: Abstract Reservoirs are an important water source in many densely populated areas in southwest China. Phytoplankton play an essential role in maintaining the structure and function of reservoir ecosystems. Understanding the succession in phytoplankton communities and the factors driving it are essential for effective water quality management in drinking water reservoirs. In this study, water samples were collected monthly at the surface layers from March 2016 to December 2019 in Hongfeng Reservoir, southwest China. The relationship between functional group succession was analyzed based on nonmetric multidimensional scaling analysis (NMDS), redundancy analysis (RDA), succession rate, and other analysis methods. The results showed distinct shifts in the community structure of phytoplankton functional groups within study period. The Cyclotella sp. was dominant in 2016 and 2017, and Pseudanabaena limnetica was the dominant group in 2018 and 2019. It appears that the phytoplankton composition and biomass are closely related to the water temperature and nutrient status in this reservoir. The results clearly showed that the permanganate index (CODMn) was the key factor of dramatic phytoplankton functional group succession, and the change in succession rates was closely caused by total nitrogen concentration (TN). Therefore, the succession pattern and key factors of Hongfeng Reservoir revealed in this study were important guidance for the management of drinking water reservoirs in southwest China. A reasonable limit on exogenous nutrient input should be a priority, especially in high water temperature period.
      PubDate: 2022-04-29
       
  • Petrology and geochemistry of cold seep carbonates from the northern
           Okinawa Trough, East China Sea: implications to early diagenesis

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      Abstract: Abstract Carbonate samples were collected from the northern Okinawa Trough in the East China Sea in 2013. The petrology, mineralogy, carbon and oxygen isotopes, and rare earth elements (REEs) of these samples were analyzed. Aragonite, high-Mg calcite, and dolomite were the main carbonate minerals, the contents of which varied greatly among the carbonate samples. Petrological observations revealed the common occurrence of framboidal pyrites. The δ13C values of carbonates varied from −53.7‰ to −39.39‰ (average of −47.3‰ based on Vienna Pee Dee Belemnite (V-PDB), n=9), and the δ18O values ranged from 0.6‰ to 3.4‰ (average of 1.9‰; V-PDB, n=9). The carbon and oxygen isotope characteristics indicated that the carbonates precipitated during the anaerobic oxidation of methane. The carbon source was a mixture of thermogenic methane and biogenic methane, possibly with a greater contribution from the former. The oxygen isotope data showed that gas hydrate dissociation occurred during carbonate precipitation. The Ce anomalies suggested that the carbonates precipitated in an anoxic environment. A slight enrichment of middle REEs (MREEs) could be attributable to the early diagenesis. The structures, minerals, oxygen isotopes, and MREEs all indicated that the carbonates experienced some degree of early diagenesis. Therefore, the influence of early diagenesis should be considered when using geological and geochemical proxies to reconstruct original methane seepage environments.
      PubDate: 2022-04-29
       
  • Effects of climate change on the potential habitat distribution of
           swimming crab Portunus trituberculatus under the species distribution
           model

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      Abstract: Abstract Over the last decades, the species distribution model (SDM) has become an essential tool for studying the potential effects of climate change on species distribution. In this study, an ensemble SDM was developed to predict the changes in species distribution of swimming crab Portunus trituberculatus across different seasons in the future (2050s and 2100s) under the climate scenarios of Representative Concentration Pathway (RCP)4.5 and RCP8.5. Results of the ensemble SDM indicate that the distribution of this species will move northward and exhibit evident seasonal variations. Among the four seasons, the suitable habitat for this species will be significantly reduced in summer, with loss rates ranging from 45.23% (RCP4.5) to 88.26% (RCP.8.5) by the 2100s. The loss of habitat will mostly occur in the East China Sea and the southern part of the Yellow Sea, while a slight increase in habitat will occur in the northern part of the Bohai Sea. These findings provide an information forecast for this species in the future. Such forecast will be helpful in improving fishery management under climate change.
      PubDate: 2022-04-29
       
  • Novel evolutionary insights into nemacheilid cavefish: evidence from
           comparative analysis of mitochondrial genomes

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      Abstract: Abstract Cavefish can be important models for understanding the relationships among evolution, adaptation, and development in extreme environments. However, cavefish remain poorly studied, particularly at the genome level. Here, we sequenced the complete mitogenome of three cavefish in the family Nemacheilidae (Paranemachilus pingguoensis, Oreonectes polystigmus, and Heminoemacheilus longibarbatus), which were collected from karst caves in South China. The mitogenomes each contained 37 genes (13 protein coding, 22 tRNA, and two rRNA genes) and a single control region, with the same genetic arrangement and distribution as those found in vertebrates. The non-synonymous/synonymous mutation ratios (Ka/Ks) of the mitogenomes indicated that the protein-coding genes (PCGs) of the three cavefish evolved under purifying selection. The mitogenomes of the three cavefish exhibit nucleotide composition biases for PCGs, tRNAs, rRNAs, and the whole genome, indicating that the mitochondrial DNA might have been subjected to evolutionary selection in response to extreme cave environments. Divergence time and evolutionary history analyses suggested that the speciation and diversification of the cavefish coincided with the Miocene uplift of the southern Qinghai-Tibet Plateau, which greatly changed cave habitats. Overall, our study sheds light on the mitogenomes, phylogeny, and evolutionary history of nemacheilid cavefish.
      PubDate: 2022-04-29
       
  • The potential distribution of adult Antarctic krill in the Amundsen Sea

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      Abstract: Abstract Antarctic krill is the key species of ecological system in the Amundsen Sea. At present, the suitable distribution is unobtainable by scientific surveys or data from the fishery. In this paper, the maximum entropy algorithm (Maxent) was used to obtain the potential distribution of adult Antarctic krill in order to provide useful information and reasonable reference for the policy on protecting potential krill habitats around the Amundsen Sea. Occurrence points and 17 environmental variables were used to simulate the distributions. Results show that the high and moderate suitable habitats lie between 65°S and 72°S in the Amundsen Sea. The high suitable habitat accounts for 8.1% of the total area of the Amundsen Sea. The sea ice persistence (ICE), total phytoplankton (PHYC), and the minimum value of dissolved iron (Fe_min) are the three dominant contributors to the model. Results from the response curves show that Antarctic krill preferred habitats with ICE of 0.42–0.93, PHYC of 2.48–2.77 mmol/m3 and Fe_min of (7.10×10−5)−(9.45×10−5) mmol/m3. Positive trends existed in the PHYC of the high and moderate suitable habitat, and a positive trend existed in the Fe_min of moderate suitable habitat. However, the probability of presence of Antarctic krill will decrease if the increase of the PHYC and Fe_min continues.
      PubDate: 2022-04-29
       
  • Sand mining impact on Poyang Lake: a case study based on high-resolution
           bathymetry and sub-bottom data

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      Abstract: Abstract Poyang Lake in the Changjiang (Yangtze) River catchment has undergone frequent spring drought since 2003, and some researchers attributed this phenomenon to sand mining and the lakebed deformation in the outlet channel linking the lake with Changjiang River main channel. However, there is still a lack of high-resolution subaqueous geomorphological evidence of how sand mining led to lakebed deformation in the outlet channel. We examined the bed morphology and sub-bottom sedimentary structure of the outlet channel, using a multibeam echo sounder and sub-bottom profiler in Poyang Lake. We found that: (1) the subaqueous micro-topography types of the outlet channel are characterized by sand mining disturbance, natural erosional topography, and flat bed and dunes, accounting for 44.9%, 21.4%, 28.6%, and 5.1% of the channel area, respectively; and (2) sand mining activity affects the local bed topography extensively and significantly. The depth of sandpits caused by sand mining varied from 1.4 m to 12 m deeper than the surrounding bed surface, with 4.41 m of depth increase on average. Hence, the large-scale high-intensity sand mining activities and their significant geomorphic effects demand for an improved assessment for future management and longer-term sustainability. Because of the large-scale and ongoing high-intensity sand mining activities in the Poyang Lake outlet channel, these effects should raise caution in the future and contribute to monitoring efforts that are essential to implement sustainable management solutions. The present study and techniques implemented can serve as a scientific reference for dam construction and sand mining within the Poyang Lake basin.
      PubDate: 2022-04-29
       
  • Observations of turbulent mixing and vertical diffusive salt flux in the
           Changjiang Diluted Water

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      Abstract: Abstract Based on microstructure measurements from a repeated sampling station southwest of the Jeju Island during summer, we studied the hydrography, pycnocline turbulence, and vertical salt flux in the Changjiang Diluted Water (CDW). The water column was well stratified with the CDW occupied the surface ~20 m. Most of the large turbulent kinetic energy dissipation rate (ε) were found in the bottom boundary layer. Interestingly, intermittent strong turbulence (ε>10−6 W/kg) occurred in the pycnocline, which may induce strong mixing events and increase the vertical diffusive salt flux at the base of CDW by one order of magnitude. The daily-mean vertical diffusive salt flux could reach 4.3 (2.1, 8.9)×10−6 m/s. Both moored velocity measurements and associated wavelet analysis showed the presence of velocity fluctuations when there was strong pycnocline turbulence. The moderate resolution imaging spectroradiometer (MODIS) satellite images further suggest that the velocity fluctuations are induced by the prevailing internal solitary waves (ISWs) which are mainly generated at the shelf break of the East China Sea or the topographic features surrounding Jeju Island. The calculated gradient Richardson number denote the occurrence of shear instability in the pycnocline when strong turbulence presents. The presented results have strong implications for the importance of ISWs in influencing the vertical diffusion of CDW and changes in other properties.
      PubDate: 2022-04-29
       
  • Application of biofloc technology in recirculation Artemia culture system

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      Abstract: Abstract Biofloc technology (BFT) improves water quality, and productivity of the farmed species through converting ammonium nitrogen to microbial protein, stabilizing microbial community, and reducing the production cost. In this study, a small-scale biofloc development unit was designed in combination of recirculation system (RAS) for Artemia culture. Artemia growth, water quality, and microbial composition of bioflocs in RAS were studied in comparison with in-situ batch culture (Glu). Glucose was added in RAS and Glu at C/N ratio of 10. The cultures without glucose addition, but with 50% daily water renewal (WRe) and without water renewal (NWRe) were considered as the controls. Artemia were cultured at 25 °C and salinity 30 for 24 days and fed formulated feed. The results showed that compared to the controls, Glu significantly improved the Artemia biomass, increased the biofloc volume, and reduced the content of total ammonia nitrogen (TAN), nitrite nitrogen (NO2−N) and nitrate nitrogen (NO3−N) in water column (P<0.05). In addition, RAS had similar results with Glu. High throughput sequencing analysis on biofloc microbial composition demonstrated that glucose supplement shaped the microbial community structure, and increased proportion of potential probiotic bacteria and suppressed pathogenic bacteria growth. Furthermore, we analyzed the relationship between the microbial composition of biofloc and environmental factors. Canonical correspondence analysis (CCA) indicated that inorganic nitrogen in culture water had great impact on biofloc microbial composition in NWRe and WRe, whilst the dissolved organic carbon (DOC) modified the microbial community in Glu and RAS. This study shows the advantages of BFT in Artemia culture and provides practical information for applying BFT-RAS in indoor Artemia culture.
      PubDate: 2022-04-29
       
  • Bacterial communities associated with hydromedusa Gonionemus vertens in
           different regions in Chinese coastal waters

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      Abstract: Abstract Bacteria communities in cnidarian jellyfish can be harmful to many important aquaculture species, as they can be key vectors of bacterial pathogens. However, our knowledge of bacterial communities associated with jellyfish in culture ponds and their potential roles in the regulation of aquaculture species remains unclear. In this study, sequencing based on the bacterial 16S rRNA gene was used to investigate the composition and variation of the bacterial communities associated with hydromedusa Gonionemus vertens in sea cucumber culture ponds and natural marine environment. The associated bacterial communities of G. vertens from the culture ponds in the Yellow Sea and Bohai Sea had significantly different compositions, when compared with those from ambient seawater environment. Furthermore, bacterial communities associated with G. vertens had similar diversity and composition in culture ponds and natural marine environment in the Yellow Sea. There were 31 unique bacterial biomarkers identified in three locations. The major communities were highly abundant in Kiloniellales, Octadecabacter, Polynucleobacter, and Polaribacter, and are related to the environmental information processing. Pathogen candidates such as Vibrionales and Chlamydiales had notably low relative abundances (<1%). The venom of the jellyfish was considered responsible for damage to the aquaculture. This study provides important data to help assess the impact of cnidarians-associated bacterial communities on pond aquaculture and the influences on material cycling and energy flow in marine ecosystems.
      PubDate: 2022-04-29
       
  • Validation and error analysis of wave-modified ocean surface currents in
           the northwestern Pacific Ocean

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      Abstract: Abstract By incorporating the wave-induced Coriolis-Stokes forcing into the classical Ekman layer, the wave-modified ocean surface currents in the northwestern Pacific Ocean were estimated. Thus, the ocean surface currents are the combination of classical Ekman current from the cross-calibrated multi-platform (CCMP) wind speed, geostrophic current from the mean absolute dynamic topography (MADT), and wave-induced current based on the European Centre for Medium-Range Weather Forecasts (ECMWF) Interim Re-Analysis (ERA-Interim) surface wave datasets. Weight functions are introduced in the Ekman current formulation as well. Comparisons with in-situ data from Lagrangian drifters in the study area and Kuroshio Extension Observatory (KEO) observations at 32.3°N, 144.6°E, and 15-m depth indicate that wave-modified ocean surface currents provide accurate time means of zonal and meridional currents in the northwestern Pacific Ocean. Result shows that the wave-modified currents are quite consistent with the Lagrangian drifter observations for the period 1993–2017 in the deep ocean. The correlation (root mean square error, RMSE) is 0.96 (1.45 cm/s) for the zonal component and 0.90 (1.07 cm/s) for the meridional component. However, wave-modified currents underestimate the Lagrangian drifter velocity in strong current and some offshore regions, especially in the regions along the Japan coast and the southeastern Mindanao. What’s more, the wave-modified currents overestimate the pure Eulerian KEO current which does not consider the impact of waves, and the zonal (meridional) correlation and RMSE are 0.95 (0.90) and 11.25 cm/s (12.05 cm/s) respectively. These comparisons demonstrate that our wave-modified ocean surface currents have high precision and can describe the real-world ocean in the northwestern Pacific Ocean accurately and intuitively, which can provide important routes to calculate ocean surface currents on large spatial scales.
      PubDate: 2022-04-29
       
  • Oil-gas reservoir in the Mesozoic strata in the Chaoshan depression,
           northern South China Sea: a new insight from long offset seismic data

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      Abstract: Abstract The Chaoshan depression, a Mesozoic basin in the Dongsha sea area, northern South China Sea, is characterized by well-preserved Mesozoic strata, being good conditions for oil-gas preservation, promising good prospects for oil-gas exploration. However, breakthrough in oil-gas exploration in the Mesozoic strata has not been achieved due to less seismic surveys. New long-offset seismic data were processed that acquired with dense grid with single source and single cable. In addition, the data were processed with 3D imaging method and finer processing was performed to highlight the target strata. Combining the new imaging result and other geological information, we conducted integrated interpretation and proposed an exploratory well A-1-1 for potential hydrocarbon. The result provides a reliable basis for achieving breakthroughs in oil and gas exploration in the Mesozoic strata in the northern South China Sea.
      PubDate: 2022-04-29
       
  • Geographical inhomogeneity and temporal variability of mixing property and
           driving mechanism in the Arctic Ocean

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      Abstract: Abstract Upper ocean mixing plays a key role in the atmosphere-ocean heat transfer and sea ice extent and thickness via modulating the upper ocean temperatures in the Arctic Ocean. Observations of diffusivities in the Arctic that directly indicate the ocean mixing properties are sparse. Therefore, the spatiotemporal pattern and magnitude of diapycnal diffusivities and kinetic energy dissipation rates in the upper Arctic Ocean are important for atmosphere-ocean heat transfers and sea ice changes. These were first estimated from the Ice-Tethered Profilers dataset (2005–2019) using a strain-based fine-scale parameterization. The resultant mixing properties showed significant geographical inhomogeneity and temporal variability. Diapycnal diffusivities and dissipation rates in the Atlantic sector of the Arctic Ocean were stronger than those on the Pacific side. Mixing in the Atlantic sector increased significantly during the observation period; whereas in the Pacific sector, it weakened before 2011 and then strengthened. Potential impact factors include wind, sea ice, near inertial waves, and stratification, while their relative contributions vary between the two sectors of the Arctic Ocean. In the Atlantic sector, turbulent mixing dominated, while in the Pacific sector, turbulent mixing was inhibited by strong stratification prior to 2011, and is able to overcome the stratification gradually after 2014. The vertical turbulent heat flux constantly increased in the Atlantic sector year by year, while it decreased in the Pacific sector post 2010. The estimated heat flux variability induced by enhanced turbulent mixing is expected to continue to diminish sea ice in the near future.
      PubDate: 2022-03-25
       
  • Archaeal diversity in the seawater of Changjiang River estuary reveals its
           adaptability to bottom seawaters

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      Abstract: Abstract Archaea regulate the biogeochemical processes of ocean systems. The Changjiang (Yangtze) River estuary (CRE) is a complex and dynamic area strongly affected by seawaters and ocean currents. In this study, the planktonic archaeal communities in the surface and bottom seawaters of the CRE were investigated. Significant differences in the archaeal community composition were found between the surface and bottom seawaters (P<0.001). Marine Group II (MG-II) was dominant in the surface layers, and Nitrosopumilales was enriched in the bottom layers. Marine Group III (MG-III) was more abundant in the bottom layers than in the surface ones (P<0.001). These results were completely different from previous findings in the CRE seawater. Instead of dissolved oxygen (DO), temperature and salinity were the most vital environmental variations in the distribution of the archaeal communities. According to the predicted metabolic pathways, the following functional subcategories were enriched in the hypoxic condition: replication and repair, membrane transport, glycan biosynthesis and metabolism, amino acid metabolism, metabolism of cofactors and vitamins, and xenobiotics biodegradation and metabolism (P<0.001), which indicated the strong adaptability of archaea to the harsh environment in the bottom seawater. These findings expand the understanding on archaeal structure and functions in the surface and bottom seawaters, including the hypoxic zones in the CRE, and may contribute to further works of the archaeal community in the CRE.
      PubDate: 2022-03-25
       
  • Characterization and comparison of two C-type lectins with novel key
           motifs from mud crab Scylla paramamosain

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      Abstract: Abstract As an important pattern recognition receptor (PRR) in the innate immune system, C-type lectin plays an important role in the innate immune process of invertebrates. Two C-type lectins SpCTL-C and SpCTL-D were characterized from mud crab (Scylla paramamosain). The predicted SpCTL-C and SpCTL-D proteins both contain a single carbohydrate-recognition domain (CRD) with key motif Gln-Pro-Ala (QPA) and Met-Pro-Ala (MPA), respectively. SpCTL-C and SpCTL-D transcripts distributed in all examined tissues, and the expression level was the highest in hepatopancreas. As PRR, the purified recombinant proteins rSpCTL-C and rSpCTL-D have high affinity for three kinds of pathogen-associated molecular patterns (PAMPs): β-glucan, lipopolysaccharide, and peptidoglycan. Besides, rSpCTL-D can bind to all nine microorganisms tested, while rSpCTL-C can bind to seven microorganisms except for Staphylococcus aureus and Micrococcus luteus. Both rSpCTL-C and rSpCTL-D showed agglutination activity towards fungi Pichia pastoris and Saccharomyces cerevisiae. However, rSpCTL-C and rSpCTL-D exhibited different antimicrobial activities: rSpCTL-D has a certain inhibitory effect on the growth of Vibrio fluvialis and M. luteus, while rSpCTL-C has no obvious inhibitory activity. The results show that rSpCTL-C and rSpCTL-D had better phagocytosis-promoting effect on M. luteus than the negative control. Meanwhile, both rSpCTL-C and rSpCTL-D had certain encapsulation-promoting activity. Collectively, two C-type lectins with novel key motifs make an important impact as PRR in immune response towards pathogens. At the same time, they play different functions in the innate immunity of mud crab S. paramamosain.
      PubDate: 2022-03-25
       
  • Thermal processing induced release and degradation of paralytic shellfish
           toxin from mussels Mytilus edulis

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      Abstract: Abstract Understanding the risk factors associated with shellfish consumption is a relevant public health concern because of the potential adverse effects of paralytic shellfish toxins (PSTs). This work aims to study the effects of the five most common heating treatments (steaming, boiling, frying, water-bath heating, and microwaving), for different processing times and temperature/power settings, on the content of PSTs in mussels (Mytilus edulis) collected in Qinhuangdao, China. The toxin concentration, removal percentages, and toxin distribution in the cooking liquor and meat were examined. The five processing modes effectively accelerated toxin release into the cooking liquor. The average percentage removal was 73.53%±16.50% from tissues. Microwaving led to the most significant toxin degradation among the methods tested. These findings should facilitate risk assessment of PSTs in mussels.
      PubDate: 2022-03-25
       
  • Heritability estimations of ammonia tolerance and survival of ridgetail
           white prawn Exopalaemon carinicauda

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      Abstract: Abstract Ridgetail white prawn Exopalaemon carinicauda is an important economic marine species in China. To improve the germplasm quality of cultured E. carinicauda, for the first time, we estimated the heritability of ammonia tolerance and survival of E. carinicauda, covering 263 full-sib families in multiple generations. Analysis models including binary linear animal model (BLA), binary linear sire-dam model (BLSD), probit threshold animal model (PTA), and probit threshold sire-dam model (PTSD) were used. The estimated heritability of tolerance to ammonia in different models ranged from 0.09 to 0.22, and that of survival rate ranged from 0.06 to 0.16. Concerning the tolerance to ammonia, both the PTSD and BLSD models showed comparatively better prediction accuracies (0.48 and 0.47, respectively) than PTA and BLA models (0.40 and 0.26, respectively), while to the survival rate, all four models presented relatively low predictive abilities (0.16–0.26). This study provided important information for the future breeding program of E. carinicauda.
      PubDate: 2022-03-25
       
  • Cytological and transcriptional analysis reveal phosphatidylinositol
           

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      Abstract: Abstract The phosphatidylinositol (PI) signaling system, a central regulator of eukaryotic metabolism, is widely found in eukaryotes for regulating a variety of cell activities. Most of the genes in the PI signaling system were found conserved in Pyropia yezoensis. In this experiment, wortmannin was used as an inhibitor to inhibit the activity of phosphatidylinositol-3 kinase (PI3K), an important regulator of the PI signaling system. After wortmannin treatment, the mitotic division of P. yezoensis was significantly inhibited in a dose-dependent manner, and the mitotic division percentage was reduced by 68.1% and 91.9% in the 5- and 10-µmol/L groups, respectively. When thalli were treated with wortmannin, the levels of reactive oxygen species (ROS) were significantly decreased. Furthermore, the expression level of PI3K was inhibited and the expression levels of downstream genes regulated by PI3K was significantly changed. In the PI3K-AGC signaling pathway, the expression levels of Serine/threonine protein kinase (AGC) and cyclin-dependent kinases A (CDKA) were downregulated, while WEE1 kinase gene (WEE1) was upregulated. Three nicotinamide adenine dinucleotide phosphate (NADPH) oxidase genes were downregulated after wortmannin treatment. These results indicate that the PI signaling system plays an important role in the regulation of cell activity in P. yezoensis. It was speculated that the growth and development of P. yezoensis might be regulated by P. yezoensis PI3K, which promoted the expression of the AGC gene and further regulates the expression of downstream WEE1 and CDKA genes to advance mitotic division, and also promoted the expression level of NADPH oxidase that regulates ROS homeostasis.
      PubDate: 2022-03-25
       
  • Reduced salinity interacts with ultraviolet radiation to alter photosystem
           II function in diatom Skeletonema costatum*

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      Abstract: Abstract To investigate the effect of reduced salinity on diatoms’ capacity to cope with changing ultraviolet radiation (UVR) and photosynthetically active radiation (PAR), Skeletonema costatum was grown in a range of salinity (15, 25, and 35). The photosystem II (PSII) function was analyzed by increasing PAR and UVR to mimic a mixing event in turbulent waters. The results show that high UVR exposure significantly reduced PSII activity, especially in cells grown at low salinity. UVR, but not salinity, stimulated the ‘removal’ rate of PSII protein PsbA. Salinity alone, in the range of 15 to 35, did not regulate PSII acceptor region; however, the low salinity+UVR treatment decreased the energy flux for electron transport per PSII reaction center in S. costatum. It showed that low salinity exacerbated the damaging effect of UVR on PSII function in S. costatum by suppressing PsbA protein synthesis and modifying the photochemistry of PSII. Although higher catalase (CAT) activity and NPQs were induced, they were unable to prevent the combined damage effect of low salinity+UVR. Our findings indicate that reduced salinity and increased UVR potentially affect the abundance and distribution of S. costatum with the escalation of climate disturbances.
      PubDate: 2022-03-25
       
  • Transcriptome analysis of Porphyridium purpureum under salinities of 0 and
           68

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      Abstract: Abstract The most prominent biological characteristic of Porphyridium purpureum is their unique extracellular sulfated polysaccharides that plays an important protective role against salt stress. Adaptation to stress is associated with metabolic adjustments. However, the molecular mechanisms underlying such metabolic changes remain elusive. This study presents the first transcriptome profiling of P. purpureum. A total of 8 019 assembled transcripts were identified, annotated, and classified into different biological categories and pathways based on a BLAST analysis against various databases. The in-depth analysis revealed that many of the differentially expressed genes in P. purpureum under salinities of 68 and 0 involved polysaccharide metabolism. A comparison of the gene expression levels under different salinities revealed that the polysaccharide synthetic pathway was significantly upregulated under the 68 salinity condition. The increased expression of the FBP, pfkA, CS, pgm, USP, UGP2, galE, and MPI transcripts in the polysaccharide synthetic pathway and the increase in ATP2 and ATP6 transcripts in the energy metabolic pathway revealed the molecular mechanism of high-salt adaptation. This sequencing dataset and analysis could serve as a valuable resource to study the mechanisms involved in abiotic stress tolerance in Rhodophyta.
      PubDate: 2022-03-25
       
 
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