检索结果-南通市图书馆

Relationship between bacteria and phytoplankton during the giant jellyfish Nemopilema nomurai bloom in an oligotrophic temperate marine ecosystem

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2016年第10期35卷 107-113页

作者： ZENG Yang huang Xuguang huang bangqin MI Tiezhu Key Laboratory of Coastal and Wetland Ecosystems of Ministry of Education Xiamen University Fujian Provincial Key Laboratory of Coastal Ecology and Environmental Studies Xiamen University College of Chemistry and Chemical Engineering Ocean University of China

Bacterial abundance, phytoplankton community structure and environmental parameters were investigated to study the relationships between bacteria and phytoplankton during giant jellyfish Nemopilema nomurai blooms in the central Yellow Sea during 2013. N. nomurai appeared in June, increased in August, reached a peak and began to degrade in September 2013. Results showed that phosphate was possible a key nutrient for both phytoplankton and bacteria in June, but it changed to nitrate in August and September. Phytoplankton composition significantly changed that pico-phytoplankton relative biomass significantly increased, whereas other size phytoplankton significantly decreased during jellyfish bloom. In June, a significantly positive correlation was observed between chlorophyll a concentration and bacterial abundance（r=0.67, P0.001, n=34）.During jellyfish outbreak in August, there was no significant correlation between phytoplankton and bacteria（r=0.11, P0.05, n=25）, but the relationship（r=0.71, P0.001, n=31） was rebuilt with jellyfish degradation in September. In August, small size phytoplankton occupied the mixed layer in offshore stations, while bacteria almost distributed evenly in vertical. Chlorophyll a concentration significantly increased from（0.42±0.056） μg/L in June to（0.74±0.174） μg/L in August, while bacterial abundance just slightly increased. Additionally, the negative net community production indicated that community respiration was not entirely determined by the local primary productivity in August. These results indicated that jellyfish blooms potentially affect coupling of phytoplankton and bacteria in marine ecosystems.

关键词： jellyfish bloom Nemopilema nomurai phytoplankton pigments jellyfish DOM ecological consequence

Factors regulating population dynamics of the amphipod Ampithoe valida in a eutrophic subtropical coastal lagoon

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2013年第6期32卷 56-65页

作者： ZHENG Xinqing huang Lingfeng huang bangqin LIN Yongqing Third Institute of Oceanography State Oceanic Administration Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems Xiamen University

Year-round investigations were carried out to address the population dynamics of amphipod Ampithoe val- ida and its potential regulating factors in the Yundang Lagoon （a eutrophic subtropical coastal lagoon in Xiamen City, China） from October 2007 to October 2008. The results show that A. valida population was largely composed of juveniles and reached a peak abundance （12.02× 10^3 ind./m2） in March, but sharply shrunk in July. The monthly variation pattern ofA. valida seemed to follow that of Ulva lactuca which is the main food resource for A. valida, indicating a strong influence of food availability on A. valida popu- lation dynamics. Life cycle studies in laboratory indicate that A. valida adopted an r-selected life strategy, e.g., rapid growth rate （0.216-0.302 mm/d）, consecutive breeding （4-10 times）, short reproductive rhythm （9-17 d） and huge fecundity （24-192 eggs or 6-94 juveniles per brood）, which contributed to the fast pop- ulation growth ofA. valida from January to March. Although temperature may also be a significant cause, A. valida could grow quickly and show normal reproductive traits （i.e., the timing of sexual differentiation or maturity, the reproductive rhythm, the number of broods all through its lifespan and offspring produc- tion） in temperature between 15-30~ C. Therefore, the temperature variation in the lagoon water should not account for the sharp variation of A. valida population by affecting the survival, growth and reproduction of the amphipod. However, negative correlation between water temperature and U. lactuca biomass in the lagoon suggested that temperature could have indirectly affected the population dynamics ofA. ualida by affecting its food availability. The authors conclude that, in the Yundang Lagoon, the population dynamics ofA. validawas mainly controlled by the food availability rather than water temperature.

关键词： Ampithoe valida population dynamics food availability Ulva lactuca the Yundang Lagoon

The modification and optimizing of the CHEMTAX running in the South China Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2015年第2期34卷 124-131页

作者： WANG Lei huang bangqin LIU Xin XIAO Wupeng Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies/Key Laboratory of Coastal and Wetland Ecosystems of Ministry of Education College of the Environment and Ecology Xiamen University

In order to determine the phytoplankton community composition, the modification and optimizing of the CHEMical TAXonomy（CHEMTAX） running was carried out through samples grouping, successive run and evaluate the results for HPLC-pigment samples in the South China Sea（SCS）. The vertical distribution of the ratio of pigment to total Chl a（TChl a） exhibited three different patterns, including increasing with depth pattern（e.g., But-Fuco）, decreasing with depth pattern（e.g., Zea） and increasing at deep chlorophyll maximum（DCM） pattern（e.g., Hex-Fuco）. The vertical profiles for Fuco/TChl a and Pras/TChl a was higher in coast than in the shelf and basin, and the Zea and Dv-Chl a expressed conversely. So the samples in the coastal stations must be separated for the cluster analysis group procedure in the SCS. Successive run was introduced into the CHEMTAX calculation and the output results were evaluated by the convergence of pigment/TChl a ratios. Most of the ratios were well converged at the fifth running, except Zea/TChl a for Prochlorococcus and Chl b/TChl a for prasinophytes and so on. To evaluate the fifth running＇s results, haptophytes_8 and chlorophytes were two phytoplankton groups with much uncertainty. But the fifth estimated value was better than running once was supported by the regression evidence between the measured pigment concentration and calculation values. Synechococcus was another component with much mutability, and the CHEMTAX＇s result should be compared to the flow cytometry＇s cell abundance.

关键词： phytoplankton CHEMTAX pigment/Chl a ratio successive run South China Sea

Seasonal variations of phytoplankton phosphorus stress in the Yellow Sea Cold Water Mass

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2014年第10期33卷 124-135页

作者： WANG Dan huang bangqin LIU Xin LIU Guimei WANG Hui Key Laboratory of Research on Marine Hazards Forecasting National Marine Environmental Forecasting CenterState Oceanic Administration Key Laboratory of Coastal and Wetland Ecosystems Ministry of Education/Fujian Provincial Key Laboratory of Coastal Ecology and Environmental Studies Xiamen University

The Yellow Sea is located between the China Mainland and the Korean Peninsula, representing a typical shallow epicontinental sea. The Yellow Sea Cold Water Mass（YSCWM） is one of the most important physical features in the Yellow Sea. The characteristics of vertical profiles and seasonal variations of biogenic elements in the YSCWM may lead the variations of nutrient availability（e.g., phosphorus） and phosphorus stress of phytoplankton. In this study, the authors surveyed the seasonal variations of phytoplankton phosphorus stress with emphasis on the effect of the YSCWM during the four cruises in April and October 2006, March and August 2007. Using both bulk and single-cell alkaline phosphatase activity（APA） assays, this study evaluated phosphorus status of phytoplankton community, succession of phytoplankton community and ecophysiological responses of phytoplankton to phosphorus in the typical region of the YSCWM. With the occurrence of the YSCWM, especially the variations of concentration of dissolved inorganic phosphorus（DIP）, the results of bulk APA appeared corresponding seasonal variations. Along Transects A and B, the mean APA in August was the highest, and that in March was the lowest. According to the ELF-labeled assay＇s results, seasonal variations of the ELF-labeled percentages within dominant species indicated that diatoms were dominant in March, April and October, while dinoflagellates were dominant in August. During the four cruises, the ELF-labeled percentages of diatoms except Paralia sulcata showed that diatoms were not phosphorus deficient in April 2006 at all, but suffered from severe phosphorus stress in August 2007. In comparison, the ELF-labeled percentages of dinoflagellates were all above 50% during the four time series, which meant dinoflagellates such as Alexandrium and Scrippsiella, sustained perennial phosphorus stress.

关键词： alkaline phosphatase phosphorus stress phytoplankton Yellow Sea Cold Water Mass Yellow Sea

Physically modulated phytoplankton production and export at submesoscales in the oligotrophic South China Sea Basin

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第8期67卷 2681-2698页

作者： Zhonghua ZHAO Mengdi XU bangqin huang Wenfang LU Hongshuai QI Feng CAI Yuwu JIANG State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361102China College of Ocean and Earth Sciences Xiamen UniversityXiamen 361102China Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies Xiamen UniversityXiamen 361102China National Observation and Research Station for the Taiwan Strait Marine Ecosystem Xiamen UniversityXiamen 361102China School of Marine Sciences Sun Yat-Sen UniversitySouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519000China Laboratory of Ocean and Coast Geology Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China

Oceanic submesoscales can significantly influence phytoplankton production and export owing to their similar timescales of *** on two-year Biogeochemical Argo(BGC-Argo) observations,this study investigated the development of submesoscale instabilities,particularly symmetric and mixed-layer baroclinic instabilities,and their impacts on biological production and export in the oligotrophic South China Sea *** the northern basin,near-surface winter blooms consistently cooccurred with seasonally deepened mixed ***,significantly stronger and weaker winter blooms were observed over two consecutive winters within the BGC-Argo observation *** the first winter,symmetric-instability-induced upward nutrient entrainment played a crucial role in initiating the strong winter bloom in early December,when the mixed layer was approximately 20–30 m shallower than the *** bloom occurred approximately 20–30 days earlier than that anticipated owing to the contact between the seasonally deepened mixed layer and mesoscale-cyclone-induced uplifted *** symmetric instability also facilitated the export of fixed phytoplankton carbon from the surface to deeper ***,during the second winter,remarkably intense mixed-layer baroclinic instability associated with an intense mesoscale anticyclone led to more significant shoaling of the mixed layer compared to the nutricline,thus increasing the vertical distance between the two *** this condition,upward nutrient injection,phytoplankton bloom,and carbon export were *** contrast,the BGC-Argo float in the central basin revealed significantly inhibited seasonality of phytoplankton biomass and submesoscale instabilities compared to those in the northern basin,primarily owing to the significantly shallower winter mixed layer.

关键词： Submesoscale instability Phytoplankton Nutrient transport BGC-Argo South China Sea

The bacterial abundance and production in the East China Sea: seasonal variations and relationships with the phytoplankton biomass and production

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2014年第9期33卷 166-177页

作者： CHEN Bingzhang huang bangqin XIE Yuyuan GUO Cui SONG Shuqun LI Hongbo LIU Hongbin Fujian Provincial Joint Key Laboratory of Coastal Ecology and Environmental Studies and State Key Laboratory of Marine Environmental Science Xiamen University Division of Life Science Hong Kong University of Science and Technology Key Laboratory of Marine Ecology and Environmental Science Institute of Oceanology Chinese Academy of Sciences National Marine Environmental Monitoring Center State Oceanic Administration

The East China Sea is a productive marginal sea with a wide continental shelf and plays an important role in absorbing atmospheric carbon dioxide and transferring terrigenous organic matter to the open ocean. To investigate the roles of heterotrophic bacteria in the biogeochemical dynamics in the East China Sea, bacterial biomasses （BB） and productions （BP） were measured in four cruises. The spatial distributions of the BB and the BP were highly season-dependent. Affected by the Changjiang River discharge, the BB and the BP were high in shelf waters （bottom depth not deeper than 50 m） and generally decreased offshore in August 2009. In December 2009 to lanuary 2010, and November to December 2010, the BB and the BP were high in waters with medium bottom depth. The onshore-offshore decreasing trends of the BB and the BP also existed in May-June 2011, when the BB was significantly higher than in other cruises in shelf break waters （bottom depth deeper than 50 m but not deeper than 200 m）. The results of generalized additive models （GAM） suggest that the BB increased with the temperature at a range of 8-20~C, increased with the chlorophyll concentration at a range of 0.02-3.00 mg/m3 and then declining, and decreased with the salinity from 28 to 35. The relationship between the temperature and the log-transformed bacterial specific growth rate （SGR） was linear. The estimated temperature coefficient （Q10） of the SGR was similar with that of the phytoplankton growth. The SGR also increased with the chlorophyll concentration. The ratio of the bacterial to phytoplankton production ranged from less than 0.01 to 0.40, being significantly higher in November December 2010 than in May-June 2011. Calculated from the bacterial production and growth efficiency, the bacterial respiration consumed, on average, 59%, 72% and 23% of the primary production in August 2009, November-December 2010, and May-/une 2011, respectively.

关键词： bacterial production generalized additive model chlorophyll temperature East China Sea

Grazing impact of microzooplankton on phytoplankton in the Xiamen Bay using pigment-specific dilution technique

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2008年第5期27卷 147-162页

作者： huang bangqin LIU Yuan XIANG Weiguo TIAN Haojie LIU Hongbin CAO Zhenrui HONG Huasheng State Key Laboratory of Marine Environmental Science Environmental Science Research Center Xiamen University Xiamen 361005 China Atmospheric Marine and Coastal Environment Program and Department of Biology Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China

Phytoplankton group-specific growth and microzooplankton grazing were determined seasonally using the dilution technique with high-performance liquid chromatography （HPLC） in the Xiamen Bay, a subtropical bay in southeast China, between May 2003 and February 2004. The results showed that growth rates of phytoplankton ranged from 0.71 to 2.2 d^-1 with the highest value occurred in the inner bay in May. Mierozooplankton grazing rates ranged from 0.5 to 3.1 d^-1 with the highest value occurred in the inner bay in August. Microzooplankton grazing impact ranged from 39% to 95% on total phytoplankton Chl a biomass, and 65% to 181% on primary production. The growth and grazing rates of each phytoplankton group varied, the highest growth rate （up to 3.3 d^-1 ） was recorded for diatoms in August, while the maximum grazing rate （ up to 2.1 d ^-1 ） was recorded for chlorophytes in February in the inner bay. Among main phytoplankton groups, grazing pressure of microzooplankton ranged from 10% to 83% on Chl a biomass, and from 14% to 151% on primary production. The highest grazing pressure on biomass was observed for cryptophytes （83%） in August, while the maximum grazing pressure on primary production was observed for eyanobacteria （up to 151% ） in December in the inner bay. Net growth rates of larger phytoplanktons （diatoms and dinoflagellates） were higher than those of smaller groups （ prasinophytes, chlorophytes and cyanobacteria）. Relative preference index showed that microzooplankton grazed preferentially on prasinophytes and avoided to harvest diatoms in cold seasons （December and February）.

关键词： microzooplankton growth rate grazing mortality photosynthetic pigments Xiamen Bay dilution method

Diversity,community structure,and quantity of eukaryotic phytoplankton revealed using 18S rRNA and plastid 16S rRNA genes and pigment markers:a case study of the Pearl River Estuary

在线全文

学校读者我要写书评

暂无评论

Marine Life Science & Technology 2023年第3期5卷 415-430页

作者： Shumin Xu Guihao Li Cui He Yi huang Dan Yu Huiwen Deng Zhuyin Tong Yichong Wang Christine Dupuy bangqin huang Zhuo Shen Jie Xu Jun Gong School of Marine Sciences Sun Yat-Sen University(Zhuhai Campus)and Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519000China Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering Guangzhou 510006China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361102China BIOFEEL UMRi LIENSsLa Rochelle Université/CNRSLa RochelleFrance Centre for Regional Oceans Department of Civil and Environmental EngineeringFaculty of Science and TechnologyUniversity of MacaoMacaoChina

Understanding consistencies and discrepancies in characterizing diversity and quantity of phytoplankton is essential for better modeling ecosystem *** this study,eukaryotic phytoplankton in the Pearl River Estuary,South China Sea were investigated using nuclear 18S rRNA and plastid 16S or 23S rRNA genes and pigment *** was found that 18S abundance poorly explained the variations in total chlorophyll a(Chl-a).However,the ratios of log-transformed 18S abundance to Chl-a in the major phytoplankton groups were generally environment dependent,suggesting that the ratio has potential as an indicator of the physiological state of *** richness of 18S-based operational taxonomic units was positively correlated with the richness of 16S-based amplicon sequence variants of the whole phytoplankton community,but insignifcant or weak for individual phytoplankton ***,the 18S based,rather than the 16S based,community structure had a greater similarity to pigment-based *** to the pigment data,the proportion of haptophytes in the 18S dataset,and diatoms and cryptophytes in the 16S dataset,were *** study highlights that 18S metabarcoding tends to refect biomass-based community organization of eukaryotic *** there were lower copy numbers of plastid 16S than 18S per genome,metabarcoding of 16S probably approximates cell abundance-based community *** in biomass organization of the pigment-based community were sensitive to environmental *** together,multiple methodologies are recommended to be applied to more accurately profle the diversity and community composition of phytoplankton in natural ecosystems.

关键词： Accessory pigments Chloroplast Marker gene Metabarcoding Phytoplankton

Responses of phytoplankton and its satellite bacteria to exogenous ethanol

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第1期41卷 203-214页

作者： Rediat ABATE Buce Hanoch HETHARUA Vishal PATIL Daner LIN Demeke KIFLE Junrong LIANG Changping CHEN Lin SUN Shuh-Ji KAO Yonghong BI bangqin huang Yahui GAO Key Laboratory of Algal Biology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China School of Life Sciences Xiamen UniversityXiamen 361102China Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem College of Environment&EcologyXiamen UniversityXiamen 361102China State Key Laboratory of Marine Environmental Sciences Xiamen UniversityXiamen 361101China Department of Zoological Sciences Addis Ababa UniversityAddis AbabaPO Box 1176Ethiopia

The response of phytoplankton and its satellite bacteria to various concentrations(0.01%-10%v/v)of ethanol is *** elucidate the effect of ethanol,single-strains of phytoplankton(SSP)culture,pure strains of satellite bacteria isolated from nonaxenic SSP cultures,and Escherichia coli were *** indicate that ethanol could promote the growth and photo synthetic efficiency(F_(v)/F_(m))of S SP at 0.01%and the growth of satellite bacteria at 0.01%-1%.Nevertheless,ethanol inhibited the growth and F_(v)/F_(m)of SSP at 0.1%-1%,and killed bacteria and SSP at 10% *** investigation on a satellite bacterium(Mameliella alba)revealed that ethanol promotes growth by serving as a growth stimulant rather than a metabolic carbon *** 16 S rRNA gene amplicon indicated that all nonaxenic S SP cultures harbor distinct satellite bacteria communities where the SSP culture of Skeletonema costatum,Phaeodactylum tricornutum,and Dunaliella bardawil were dominated by bacteria genera of Marivita(~80%),Dinoroseobacter(~47%),and Halomonas(~87%),respectively,indicating that every SSP cultures have their own distinct satellite bacterial *** bacteria family Rhodobacteraceae was dominant in the two marine diatoms,whereas Halomonadaceae was dominant in the saline green *** to their respective controls,the supply of 0.5% ethanol to SSP cultures promoted the growth of the satellite bacteria but did not cause a significant difference in species composition of satellite ***,a low concentration of ethanol can promote the growth of bacteria in a non-selective *** study enriched our knowledge about the effect of ethanol on aquatic microbes and provided a baseline for basic and applied biotechnological re search in the aquatic environment in the future.

关键词： aquatic microbes bacteria diversity ethanol effect growth inhibition growth stimulation