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Dietary preferences and potential ecological impact on the zooplankton community of nemopilema nomurai based on stable isotope and fatty acid analyses

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Journal of Oceanology and Limnology 2022年第3期40卷 1085-1096页

作者： Junjian WANG Chaolun LI Guang YANG Zhencheng TAO Yanqing WANG Haochen XIAN Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China North China Sea Marine Forecasting Center of State Oceanic Administration Qingdao 266100China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Department of Engineering and Technology Institute of Oceanology Chinese Academy of SciencesQingdao 266071China

Information on the dietary composition and food preferences of the giant jellyfish nemopilema nomurai is important for understanding the trophic drivers of jellyfish outbreaks and their ecological consequences.We used fatty acid(FA)and stable isotope(SI)biomarkers to analyze the diet of N.nomurai from the Yellow Sea in August 2016.N.nomurai was found at all sampling stations,with abundances ranging from 59 inds./km^(2) to 1651 inds./km^(2).There were no significant differences between large(>80 cm in diameter)and small(20–30 cm in diameter)medusae,either in FA compositions or in SI values,which suggests that large and small jellyfi sh have the same food composition and similar trophic levels.Compared to other zooplanktons,the relatively high levels of C20꞉4n-6 in total FAs(~12%)indicates that organic detritus contributes considerably to the food composition of the jellyfish.The mixed model Stable Isotope Analysis in R(SIAR)revealed that N.nomurai tended to prey on smaller organisms(nomurai blooms will put high feeding pressure on the small plankton.The similar SI values and FA composition indicates that krill may share the same food resources with N.nomurai,which suggests that the jellyfi sh blooms may affect krill populations as a result of food competition.

关键词： nemopilema nomurai fatty acid stable isotope dietary preferences

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Physical processes determining the distribution patterns of nemopilema nomurai in the East China Sea

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Journal of Oceanology and Limnology 2023年第6期41卷 2160-2165页

作者： Song SUN Haochen XIAN Ziyuan HU Xiaoxia SUN Fang ZHANG Key Laboratory of Marine Ecology and Environmental Science Institute of OceanologyChinese Academy of SciencesQingdao 266071China Jiaozhou Bay National Marine Ecosystem Research Station Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Laoshan LaboratoryQingdao 266237China University of Chinese Academy of Sciences Beijing 100049China

The giant jellyfish nemopilema nomurai is the largest and most dangerous jellyfish species in East Asian waters,and the N.nomurai bloom causes serious problem in coastal industries,fisheries,and tourism.In the previous surveys,we found N.nomurai could not be observed in the south of 30°N.In this paper,we analyzed the mechanism of this phenomenon.After exploring the possible impacts of different environmental factors,we found that physical processes are essential to the distribution pattern of N.nomurai rather than biological or chemical factors in the East China Sea.The combination of the location of the initial breeding places of N.nomurai and the current system determine the distribution pattern.This study could provide important insights to the potential control of the giant jellyfish in the Chinese coastal waters.

关键词： giant jellyfish nemopilema nomurai distribution pattern physical process East China Sea

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

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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

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Experiments and evidences: jellyfish (nemopilema nomurai) decomposing and nutrients (nitrogen and phosphorus) released

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Acta Oceanologica Sinica 2015年第8期34卷 1-12页

作者： LI Xuegang SONG Jinming MA Qingxia LI Ning YUAN Huamao DUAN Liqin QU Baoxiao Institute of Oceanography Chinese Academy of Sciences University of Chinese Academy of Sciences

The aim of this study was to investigate nitrogen and phosphorus released in the process of the decomposition of giant jellyfish in the laboratory and found the evidence to verify the influence of nutrients released by the decomposition of jellyfish on the ecosystem in the field. The release of nitrogen and phosphorus from the decomposition of Nernopilerna nomurai was examined in a series of experiments under different incubation conditions such as different pH values, salinity values, temperatures and nitrogen and phosphorus concentrations. The results showed that the complete decomposition of nemopilema nomurai generally took about 4-8 d. The release of nitrogen and phosphorus from the decomposition of nemopilema nomurai could be divided into two stages： the early stage and the later stage, although the efflux rate of nitrogen was one order more than phosphorus. In the early stage of the decomposition of nemopilema nomurai, the concentrations of dissolved nitrogen, dissolved phosphorus, total nitrogen and total phosphorus in seawater increased rapidly, and the concentration of nitrogen could reach the highest level in the whole degradation process. In the later stage of the decomposition, the concentrations of dissolved nitrogen and total nitrogen declined slowly, while the concentration of phosphorus in water could reach a maximum in the degradation process. High pH, low salinity, high temperature and N/P will promote the release of nitrogen; low pH is unfavorable to the release of nitrogen but favorable to the release of phosphorus. In addition, we found the concentrations of ammonium and phosphate in the bottom water were higher than those in the surface water during the period of jellyfish bloom in the ]iaozhou Bay, proving that nutrients released by the decomposition of jellyfish have significant influence on nitrogen and phosphorus in the field. For the whole Yellow Sea, nutrients released by jellyfish carcasses may reach up to （2.63±2.98）x10^7 mol/d of dissolved nitrogen （DN） and （0.74±0.84）x10^8 mol/d o

关键词： nemopilema nomurai decomposition nitrogen phosphorus experiments evidences

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Molecular monitoring plankton community during jellyfish blooms in the water near the Liaoning Hongyan River Nuclear Power Plant

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Journal of Oceanology and Limnology 2023年第5期41卷 1781-1794页

作者： Ming YUE Tiezhu MI Ying LI Xianyu GONG Yu ZHEN Key Laboratory of Marine Environment and Ecology Ocean University of ChinaMinistry of EducationQingdao 266100China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China

The Liaoning Hongyan River Nuclear Power Plant is located on the east coast of Liaodong Bay in the Bohai Sea,China,and the safety of the cooling water is often threatened by large-scale jellyfish outbreaks.Thus,monitoring jellyfish growth,migration,and disappearance is essential to the safety of the nuclear power plant.In this study,high-throughput sequencing was used to analyze the community characteristics of mesoplankton in the sea area at the inlet and outlet from April to September 2019.At the same time,the micro-individuals of jellyfish(including oosperm,planula,polyps,or ephyra of jellyfish)in the water were detected by real-time fluorescent quantitative PCR(qPCR).Both the maximum abundance of Aurelia coerulea and nemopilema nomurai in July were detected by high-throughput sequencing and q PCR.Only three common taxa of plankton(Paracalanus,Calanoida,and Poaceae)were found in the waters near the inlet and outlet,and the beta diversity of plankton in the waters near the inlet and outlet was low in the same period.Based on the plankton community composition in the sea water near the inlet,it could be speculated that jellyfish outbreaks would have a significant impact on the plankton via the predation effect.The maximum mt-16S rDNA copy numbers of A.coerulea and N.nomurai in the samples from the waters of Liaodong Bay were detected in June 2019,and that of N.nomurai showed an increasing trend from north to south,with the jellyfish tending to move to the seawaters near the plant.The results indicate that the optimum monitoring period for jellyfish outbreaks in Liaodong Bay is from the end of May to the end of July.

关键词： jellyfish Aurelia coerulea nemopilema nomurai molecular monitoring community

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Species-specific detection and quantification of scyphomedusae in Jiaozhou Bay,China,using a quantitative real-time PCR assay

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Journal of Oceanology and Limnology 2021年第4期39卷 1360-1372页

作者： Jianyan WANG Tiezhu MI Zhigang YU Guoshan WANG Qinsheng WEI Jing YANG Yu ZHEN Department of Science Research Beijing Museum of Natural HistoryBeijing 100050China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education/Institute for Advanced Ocean StudyOcean University of ChinaQingdao 266100China National Marine Hazard Mitigation Service Ministry of Natural ResourcesBeijing 100194China First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China

Over the past decades,jellyfish occurred increasingly and abundantly in coastal areas worldwide.Usually,biomass of jellyfish,especially when they bloom,can be determined by visual counting.However,tiny individuals of jellyfish(e.g.,planulae,polyps,and ephyrae)are difficult to detect in the field.In this study,species-specific quantitative real-time PCR assays(qPCR)(SYBR Green I)targeting the mitochondrial 16S rDNA(mt-16S rDNA)of jellyfish were developed and were used to estimate the distribution and seasonal fluctuations of four jellyfish species(nemopilema nomurai,Cyanea nozakii,Rhopilema esculentum,and Aurelia coerulea)in Jiaozhou Bay(JZB),China in 2013.The mt-16S rDNA of A.coerulea and N.nomurai was detected in most of the survey months and it peaked in July(1.03×10^(4) copies/L)and September(1.08×10^(6) copies/L),respectively.The mt-16S rDNA of C.nozakii occurred from August to October only with monthly mean values of 7.18-46.17 copies/L and was mainly located from the middle part to the outer part of the bay.The mt-16S rDNA of R.esculentum was the least abundant among the four species and was detected in only one sample(B2 station in March),with a value of 88.49 copies/L.The Spearman correlation test revealed that phytoplankton biomass was significantly and positively correlated with the mt-16S rDNA abundance of A.coerulea(R=0.37,Pnomurai(R=-0.36,P<0.01).The qPCR assay will enable the identification and quantification of jellyfish species in their whole life history and can be used as an approach in combination of the traditional jellyfish survey.

关键词： jellyfish bloom Aurelia coerulea nemopilema nomurai Cyanea nozakii Rhopilema esculentum mitochondrial 16S rDNA

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Study on Jellyfish Outbreaks and Their Monitoring and Control Technology in the Yellow Sea and the Northern East China Sea

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Meteorological and Environmental Research 2020年第4期11卷 90-94,97页

作者： Bangping DENG Haofei ZHANG East China Sea Environmental Monitoring Center State Oceanic AdministrationShanghai 201206China Key Laboratory of Marine Ecological Monitoring and Restoration Technology Ministry of Natural ResourcesShanghai 201206China

Jellyfish outbreaks have become a new type of marine ecological disasters,and have great influence on the structure and function balance of marine ecosystems,fishery resources,production safety of coastal power plants,marine landscape and tourism.In recent years,the Yellow Sea and the northern East China Sea are the high risk areas of jellyfish outbreaks.In this paper,the research results of jellyfish outbreaks in the Yellow Sea and the northern East China Sea are summarized,and the species composition,distribution,life-history characteristics and hazards of jellyfish outbreaks are described.Meanwhile,the possible causes of jellyfish outbreaks are analyzed,and the monitoring and control technology of jellyfish disasters are discussed.It will provide a scientific basis for the monitoring,management,and emergency disposal of jellyfish disasters.

关键词： Jellyfish outbreaks Ecological disasters Cyanea nozakii nemopilema nomurai Aurelia aurita Yellow Sea Northern East China Sea

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