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Bacterial and archaeal communities in deep sea waters near the Ninetyeast Ridge in Indian Ocean

Journal of Oceanology and Limnology 2021年第2期39卷 582-597页

作者： Ping GAO Lingyun QU Guangxun DU Qinsheng WEI Xuelei ZHANG Guang YANG Key laboratory of marine Eco-Environmental science and technology First Institute of OceanographyMinistry of Natural Resources(MNR)Qingdao 266061China laboratory for marine Fisheries science and Food Production Processes Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China laboratory for marine Ecology and Environmental science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

Depth-dependent distribution patterns of bacterial and archaeal communities in deep sea water column around the Ninetyeast Ridge in the Indian Ocean were investigated using 16S rRNA gene *** was conducted at the northern Ninetyeast Ridge(1°59.89′N–9°59.70′S,87°58.90′E–88°00.03′E)from September to November 2016 where samples were collected from the bathyal(1000 m)to bathypelagic depths(>4000 m)in four different stations.A total of 1565405 clean data falling into 6712 bacterial OTUs and 1452727 clean data falling into 806 archaeal OTUs based on 97%similarity level were *** of the bacterial 16S rRNA gene sequences were affiliated with Gammaproteobacteria,followed by Alphaproteobacteria and *** archaeal 16S rRNA gene sequences mostly affiliated to Nitrososphaeria(Thaumarchaeota)dominated with relative abundances ranging from 52.68%to 97.2%,followed by Thermoplasmata(Euryarchaeota).Vertical partitioning of bacterial and archaeal communities among different water layers was *** correspondence analysis(CCA)and Spearman’s correlations revealed that depth(P=0.003),dissolved oxygen(P=0.019),and nitrite(P=0.033)were the main environmental factors affecting bacterial community structure at genus level in the Ninetyeast *** the other hand,the first two CCA axes accounted for 74.4%of the explained total variance,it seems that the archaeal communities at genus level were heavily influenced by the environmental variables including depth,dissolved oxygen(DO),nitrite,salinity,phosphate,ammonia,nitrate,and silicate,but none of them exhibited any significant correlation on the structuring(P>0.1).

关键词： deep sea water the Ninetyeast Ridge 16S rRNA gene bacteria archaea

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Calcification of planktonic foraminifer Neogloboquadrina pachyderma(sinistral) controlled by seawater temperature rather than ocean acidification in the Antarctic Zone of modern Sothern Ocean

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science China Earth sciences 2022年第9期65卷 1824-1836页

作者： Qianwei SONG Bingbin QIN Zheng TANG Yanguang LIU Zhihua CHEN Jingteng GUO Zhifang XIONG Tiegang LI Key laboratory of marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China laboratory for marine Geology Pilot National Laboratory for Marine Science and TechnologyQingdao 266237China

Neogloboquadrina pachyderma(sinistral), the dominant planktonic foraminiferal species in the mid-to-high latitude oceans, represents a major component of local calcium carbonate(CaCO) production. However, the predominant factors,governing the calcification of this species and its potential response to the future marine environmental changes, are poorly understood. The present study utilized an improved cleaning method for the size-normalized weight(SNW) measurement to estimate the SNW of N. pachyderma(sin.) in surface sediments from the Amundsen Sea, the Ross Sea, and the Prydz Bay in the Antarctic Zone of the Southern Ocean. It was found that SNW of N. pachyderma(sin.) is not controlled by deep-water carbonate dissolution post-mortem, and can be therefore, used to reflect the degree of calcification. The comparison between N. pachyderma(sin.) SNW and environmental parameters(temperature, salinity, nutrient concentration, and carbonate system) in the calcification depth revealed that N. pachyderma(sin.) SNWs in the size ranges of 200–250, 250–300, and 300–355 μm are significantly and positively correlated with seawater temperature. Moreover, SNW would increase by ~30% per degree increase in temperature, thereby suggesting that the calcification of N. pachyderma(sin.) in the modern Antarctic Zone of the Southern Ocean is mainly controlled by temperature, rather than by other environmental parameters such as ocean acidification. Importantly, a potential increase in calcification of N. pachyderma(sin.) in the Antarctic Zone to produce CaCOwill release COinto the atmosphere. In turn, the future ocean warming will weaken the ocean carbon sink, thereby generating positive feedback for global warming.

关键词： Planktonic foraminiferal SNW Sonication CaCO3 production Ocean carbon cycle Climate change

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Effects on the STAT3-shRNA in Non-Small-Cell Lung Cancer Therapy: Design, Induction of Apoptosis, and Conjugation with Chitosan-Based Gene Vectors

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Journal of Ocean University of China 2021年第5期20卷 1097-1108页

作者： ZHANG Wangwang ZHANG Yan JIANG Zhiwen SUN Le WANG Litong GU Zhiyang LI Wenya GUO Lili CHEN Xiaotong ZHANG Haibin HAN Baoqin CHANG Jing College of marine Life science Ocean University of ChinaQingdao 266003China laboratory for marine Drugs and Bioproducts Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266235China

STAT3 plays a particularly important role in several cancer-related signal transduction *** STAT3 via RNA interference or small molecule inhibitors induces the apoptosis of tumor cells,thereby inhibiting the growth of the *** this study,short-hairpin RNA sequences targeting the STAT3 genes were designed,synthesized,and then connected to pGPU6/GFP/Neo plasmids as the shRNA-expression *** expression of STAT3-shRNA was analyzed by real-time PCR,western blotting,and cell apoptosis assay to study the growth and apoptosis of the ***,the effect of STAT3 knockdown on the NCI-H1650 cells was studied in a tumor mouse *** results revealed that,after an in vitro transfection,the proliferation of NCI-H1650 cells was inhibited,and the cells were induced to *** mRNA and protein expression levels of STAT3 were downregulated in the STAT3-shRNA *** vivo,the tumor mass and volume in the STAT3-shRNA group were significantly lower than in the other two *** the in vivo and in vitro results demonstrated a long-period inhibiting effect on NSCLC,especially in vivo,when the tumor inhibition rate could reach 50%in the STAT3-shRNA group,which is an exciting ***,the study of the conjugation of STAT3-shRNA and chitosan-based vectors revealed that they could be combined steadily with good cytocompati-bility and transfection *** results together provide convincing evidence for the application of STAT3-shRNA used in the treatment of non-small lung cancer,which could be a promoting prospect for the development of gene therapy.

关键词： signal transducer and activator of transcription 3 short-hairpin RNA target downregulation chitosan-based vectors gene therapy

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Physical-biogeochemical interactions and potential effects on phytoplankton and Ulva prolifera in the coastal waters off Qingdao(Yellow Sea, China)

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Acta Oceanologica Sinica 2019年第2期38卷 11-23页

作者： Qinsheng Wei Baodong Wang Qingzhen Yao Zhigang Yu Mingzhu Fu Junchuan Sun Bochao Xu Linping Xie Ming Xin First Institute of Oceanography Ministry of Natural Resources laboratory for marine Ecology and Environmental science Pilot National Laboratory for Marine Science and Technology (Qingdao) Key laboratory of marine Chemistry Theory and technology of Ministry of Education Ocean University of China

In recent years, the spectacular massive green tide of Ulva prolifera has become a recurrent phenomenon appearing every summer in the coastal waters off Qingdao(Yellow Sea, China), attracting the attention of scientists and local government. Based on multidisciplinary data collected during summer and winter, this study focuses on the hydrological characteristics and regional biogeochemical processes in coastal waters off *** results show that the boundary of the Yellow Sea Cold Water Mass(YSCWM) can reach the Qingdao coastal region in summer and is locally raised to the upper layers to form coastal upwelling beyond tidal mixing and favorable wind. The regional summer upwelling off the Qingdao coast effectively enriches the nutrient concentrations in the upper water column and thus promotes growth of phytoplankton but reduces the dissolved oxygen(DO) concentration and pH value in the bottom. The regional summer upwelling off Qingdao coast may facilitate the growth and regional blooming of the U. prolifera that migrate to this region with the southerly ***, the effects of the front on the aggregation of U. prolifera may be significant. In winter, the Yellow Sea Warm Current(YSWC) extends and spreads along the offshore region off the Subei Shoal towards the Qingdao coastal sea. This tongue-shaped warm water meets the cold coastal water off Qingdao, which leads to the formation of a physical front. As a consequence, remarkable fronts of nutrient and chlorophyll a(Chl a) also form between the shoreward warm water and the cold coastal water. This study increases the understanding of the interactions between the regional physical, chemical, and biological processes off the Qingdao coast.

关键词： biogeochemical process upwelling front Ulva prolifera Qingdao coast southern Yellow Sea

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A study of intra-seasonal variations in the subsurface water temperatures in the South China Sea

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Acta Oceanologica Sinica 2019年第4期38卷 97-105页

作者： Zhan Lian Baonan Sun Zexun Wei Yonggang Wang Xinyi Wang Key laboratory of marine science and Numerical Modeling First Institute of OceanographyMinistry of Natural Resources laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology (Qingdao)

Through analysis of the results of a verified high-fidelity numerical model, the intra-seasonal variations(ISVs) in the depth of the 22°C isotherm(D22) in the South China Sea(SCS) basin are investigated. The results show that the ISVs in the D22 exhibit distinct seasonality in the SCS. The ISVs in the D22 are quite significant, especially within a band along the northwestern boundary of the basin and at the southern end of the basin during boreal winter. In these areas, the ratio of the standard deviations(STDs) of intra-seasonal band to the STDs of total data could exceed 0.6. Although the ISVs in the D22 are detectable in the area affected by the Vietnam Offshore Current during boreal summer and autumn, these variations are sometimes overwhelmed by oscillations with other frequencies. An analysis of the causes of the ISVs in the D22 in the SCS indicates that sea surface fluxes and wind stirring are not the dominant external driving mechanisms of the phenomena described above. The ISVs in the D22 are thought to be induced mainly by the thermodynamic adjustment of the ocean itself and the associated instabilities. The energy of the northern and southern bands that display strong ISVs in the D22 may be derived from eddy kinetic energy, rather than eddy available potential energy. The diversity of the propagation of the ISVs in the D22 is very conspicuous within these two bands.

关键词： intra-seasonal variations depth of 22°C isotherm South China Sea

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Population differentiation in the dominant species(Ulva prolifera)of green tide in coastal waters of China

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Acta Oceanologica Sinica 2022年第11期41卷 108-114页

作者： Hongbin Han Yan Li Xiaojun Ma Wei Song Zongling Wang Mingzhu Fu Xuelei Zhang Key laboratory of marine Eco-Environmental science and technology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China laboratory of marine Ecology and Environmental science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

Since 2015,green tides with Ulva prolifera as the dominant species in the Qinhuangdao coastal waters have continued to *** this study,the relationship between green tides in Qinhuangdao and the Yellow Sea(setting sites in Rudong and Qingdao)was evaluated by genetic analyses of *** nucleotide polymorphism(SNP)markers were used to analyze genetic diversity and genetic relationships among *** differentiation was lower among floating *** populations in Rudong and Qingdao than in *** floating *** population had higher genetic diversity and polymorphism levels in Qingdao and Rudong than in *** experiments showed that the growth rate and net buoyancy of floating *** were highest in Qinhuangdao and Qingdao,respectively,under the same environmental conditions(temperature and light).Overall,these findings showed that *** populations in the Qinhuangdao and Yellow Sea green tides(Rudong and Qingdao)differ significantly at the molecular and physiological ***,the Qinhuangdao green tide is not correlated with the Yellow Sea green tide and has a different origin and development *** study provides insight into the mechanism underlying green tide blooms in coastal waters of China.

关键词： Ulva prolifera green tide dominant species population differentiation Qinhuangdao

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Characteristics and temporal variations of near-bottom currents near the Dongsha Island in the northern South China Sea

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Acta Oceanologica Sinica 2019年第4期38卷 80-89页

作者： Dawei Li Zexun Wei Yonggang Wang Shujiang Li Tengfei Xu Guanlin Wang Fei Teng Key laboratory of marine science and Numerical Modeling First Institute of OceanographyMinistry of Natural Resources laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology (Qingdao)

Near-bottom currents play important roles in the formation and dynamics of deep-water sedimentary *** study examined the characteristics and temporal variations of near-bottom currents, especially the tidal components, based on two campaigns(2014 and 2016) of in situ observations conducted southeast of the Dongsha Island in the South China Sea. Results demonstrated near-bottom currents are dominated by tidal currents, the variance of which could account for ～70% of the total current variance. Diurnal tidal currents were found stronger than semidiurnal currents for both barotropic and baroclinic components. The diurnal tidal currents were found polarized with predominantly clockwise-rotating constituents, whereas the clockwise and counterclockwise constituents were found comparable for semidiurnal tidal currents. It was established that diurnal tidal currents could induce strong current shear. Baroclinic tidal currents showed pronounced seasonal variation with large magnitude in winter and summer and weak magnitude in spring and autumn in 2014. The coherent components accounted for ～65% and ～50% of the diurnal and semidiurnal tidal current variances,respectively. The proportions of the coherent and incoherent components changed little in different seasons. In addition to tidal currents, it was determined that the passing of mesoscale eddies could induce strong nearbottom currents that have considerable influence on the deep circulation.

关键词： tidal currents South China Sea near-bottom currents mesoscale eddies

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Seasonal characteristics and forcing mechanisms of the surface Kuroshio branch intrusion into the South China Sea

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Acta Oceanologica Sinica 2019年第1期38卷 13-21页

作者： Jingsong Guo Zhixin Zhang Changshui Xia Binghuo Guo Key laboratory of marine science and Numerical Modeling First Institute of Oceanography Ministry of Natural Resources laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory of Marine Science and Technology (Qingdao)

Using observational data of Argos satellite-tracked drifters from 1988 to 2012, we analyzed seasonal characteristics of the surface Kuroshio branch(KB) intrusion into the South China Sea(SCS). The analysis results are as *** surface KB originates from the southern Balintang Channel(BLTC) and Babuyan Channel(BBYC). It begins in late September, reaches peak strength in November–December, and declines at the end of March. The mean speed of drifters along the KB path during their traverse of the Luzon Strait(LS) was 43% faster than during the two days before entering the LS for the flow originating from the southern BLTC, but there was a 24% increase in speed for the flow from the BBYC. The observations show that in winter, monthly-mean sea-level anomalies(SLAs) were positive southwest of Taiwan Island and extended to the northern LS. The SLAs were negative northwest of Luzon Island and extended to the southern LS, which acted like a pump, forcing a part of Kuroshio water westward into the SCS. The condition under which the KB forms was solved by a set of simplified motion equations. The results indicate that whether the KB can form depends upon the sea-level gradient at the central LS and region to the west, as well as the location, speed and direction of Kuroshio surface water when it enters the LS.

关键词： surface Kuroshio branch Luzon Strait forcing mechanisms

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Grain size characteristics of the carbonate-free fraction of surface sediments from the Southwest Indian Ridge area and its geological significance

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Acta Oceanologica Sinica 2019年第2期38卷 34-43页

作者： Qi Jia Dejiang Fan Xiaoxia Sun Ming Liu Wenqiang Zhang Zuosheng Yang Key laboratory of Submarine Geosciences and Prospecting Techniques of Ministry of Education Ocean University of China laboratory for marine Geology and Environment Pilot National Laboratory for Marine Science and Technology (Qingdao)

The carbonate-free fraction of 20 surface sediments collected from the ultraslow-spreading Southwest Indian Ridge(SWIR) was studied by grain size analysis and mineralogical analysis with X-ray powder diffraction(XRD),stereo microscopy and scanning electron microscopy(SEM). The characteristics of the carbonate-free fraction of the sediments were obtained, and related influential factors were discussed. The results show that the mean grain size of this fraction is in 1.96Φ–8.19Φ, with poorly sorting and unimodal, bimodal or irregular bimodal distribution patterns. Four grain size end members of the fraction are derived with the End Member Model method. The finest end member EM1 shows a significant contribution of terrigenous materials of the aeolian input and sediment carried by the bottom current. End member EM2 with medium size mainly reflects sediment of a siliceous bioclast origin. EM3 and EM4 are interpreted as representing the coarser volcanic materials related to bedrock weathering or volcanic activities. Multi-provenance is the dominant factor controlling the grain size pattern of the carbonate-free fraction of the sediments in that area. In addition, sediment transport processes such as the bottom current and wind are the minor factors that influence the grain size distribution of the carbonate-free fraction sediments.

关键词： Southwest Indian Ocean carbonate-free fraction grain size distribution pattern end member model provenance

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Origin of Cu in the PACMANUS hydrothermal field from the eastern Manus back-arc basin: evidence from mass balance modeling

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Acta Oceanologica Sinica 2019年第9期38卷 59-70页

作者： Yao Ma Xiaoyuan Wang Shuai Chen Xuebo Yin Bowen Zhu Kun Guo Zhigang Zeng Key laboratory of marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China laboratory for marine Mineral Resources Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao 266071 China University of Chinese Academy of sciences Beijing 100049 China Ocean science Isotope and Geochronology Center Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao 266071 China

Hydrothermal precipitates associated with active vents in the eastern Manus Basin, an actively opening back-arc basin in the Bismarck Sea, Papua New Guinea, are among the most Cu-rich on the modern seafloor. The volcanic rocks associated with this mineralization may be insufficiently enriched in Cu to account for the Cu content of the sulfides by simple leaching. The PACMANUS hydrothermal field lies in the eastern portion of the eastern Manus Basin. Mass balance modeling of the PACMANUS hydrothermal system indicates that simple leaching of a stationary reaction zone (0.144 km^3) by hydrothermal fluids cannot yield the Cu found in associated sulfide deposits because unacceptably high leaching, transportation and precipitation efficiencies are required to derive the Cu in sulfides by leaching processes. With 100% leaching, transport and precipitating efficiency, 0.166 km^3 of volcanic rocks would need to be leached to account for the Cu budget of hydrothermal sulfide deposits. The key requirement for forming metal-rich magmatic fluids is a large amount of metals available to enter the exsolved vapor phase. Magmas generated in the eastern Manus Basin inherently have high fO2 because of metasomatism of the mantle source by oxidized materials from the subducted slab, leading to copper enrichment in the magma chamber. Moreover, the presence of Cu in gas-rich melt inclusi on bubbles in Pual Ridge andesite is evidence that degassing and partitioning of Cu into the magmatic volatile phase has occurred in the eastern Manus Basin. Numerical mass balance modeling indicates that approximately 0.236 Mt Cu was potentially transferred to the hydrothermal system per cubic kilometer magma. Magmatic degassing seems to play a more significant role than leaching.

关键词： back-arc basin mass balance model PACMANUS hydrothermal field source of Cu

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