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Grazing and performance of the copepod Pseudodiaptomus poplesia on a Chinese strain of Aureococcus anophagefferens

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Acta Oceanologica Sinica 2018年第4期37卷 69-76页

作者： HE Xuejia HAN Didi HAN Liuyu lu songhui Research Center of Harmful Algae and Marine Biology Jinan University Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes Jinan University South China Sea Institute of Planning and Environmental Research State Oceanic Administration

Brown tides have recurred in estuary areas globally,but trophic interactions between the causative species Aureococcus anophagefferens and planktonic copepods remain poorly *** this study,we investigated performance（ingestion,growth,development and reproduction） of the planktonic copepod,Pseudodiaptomus poplesia,offered either mono-algal or mixed-algal diets containing a Chinese strain of ***.A typical Michaelis-Menten pattern existed between ingestion rate and food level when copepod fed on the monoalgal diet of this *** exhibited the highest maximum ingestion rate（Imax） than copepodids and adult *** addition,Imax value was higher in nauplii feeding on *** than on Skeletonema *** fed mixtures of *** and ***,*** selected against *** cells,but less strongly at the naupliar *** did not undergo metamorphosis and died at late naupliar stages feeding on *** alone,similar to those under ***,the presence of *** greatly reduced the reproduction rate of females in mixtures but did not influence the growth rate of *** results suggest that *** nauplii may exert grazing pressure on *** population during a brown tide,which,however,may not be persistent because of copepod population decline.

关键词： A. anophagefferens copepod grazing growth development reproduction

Response of size-fractionated phytoplankton to environmental factors near the Changjiang Estuary

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Acta Oceanologica Sinica 2019年第1期38卷 151-159页

作者： Li Li Jingyi Cen Lei Cui songhui lu Research Center for Harmful Algae and Marine Biology Jinan University Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes Jinan University

Size-based partitioning of phytoplankton is a useful tool for monitoring key phytoplankton traits, and it provides a better understanding of phytoplankton dynamics. Our aim is to determine the variation in the different size classes of phytoplankton to the total phytoplankton biomass during the spring and autumn of 2010 and examine the relationship between phytoplankton size structure and environmental variables and zooplankton community structure near the Changjiang Estuary. In the spring, phytoplankton populations were predominantly consisted of nanophytoplankton throughout the study region. In the autumn, picophytoplankton and nanophytoplankton collectively dominated the phytoplankton community. A Pearson correlation analysis highlighted the role of temperature and trophic conditions on the contributions of nanophytoplankton and picophytoplankton. The grazing pressure exerted by mesozooplankton could have played an important role in determining the microphytoplankton community structure.

关键词： phytoplankton size structure temperature trophic condition seasonal succession Changjiang Estuary

Characterization of the Complete Mitochondrial Genome of Arius dispar(Siluriformes: Ariidae) and Phylogenetic Analysis Among Sea Catfishes

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Journal of Ocean University of China 2020年第5期19卷 1198-1206页

作者： CUI Lei DONG Yuelei CAO Rongbo ZHOU Xiaoyu lu songhui Research Center of Harmful Algae and Marine Biology Jinan UniversityGuangzhou 510632China Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519000China

The mitochondrial genome(mitogenome) was 16792 bp in length, containing 13 protein coding genes(PCGs), two rRNA genes(12 S rRNA and 16 S rRNA), 22 tRNA genes, and two main non-coding regions. Among these 37 genes, 28 genes were encoded on the heavy strand, while 9 genes were transcribed on the light strand. The non-coding regions of A. dispar included a control region, a light strand replication and another 11 intergenic spacers. The CR of A. dispar contained 8 conserved sequence blocks(CSBs), a termination-associated sequence(TAS) and a pyrimidine tract. Phylogenetic analysis based on 12 PCGs revealed that A. dispar was genetically closest to Arius arius. The families Schilbeidae, Claroteidae, Mochokidae, and Ariidae formed a closely evolved clade. Molecular information from this research introduces mitogenomice data of A. dispar and suggests the phylogenetic relationships among Siluriformes.

关键词： mitochondrial genome Siluriformes Ariidae Arius dispar phylogeny

Seasonal variation of size-fractionated phytoplankton in the Pearl River estuary

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Chinese Science Bulletin 2013年第19期58卷 2303-2314页

作者： LI Li lu songhui JIANG Tao LI Xia Research Center for Harmful Algae and Marine Biology Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education InstitutesJinan University

To investigate the dynamics of phytoplankton size structure in the Pearl River estuary, concentrations of size-fractionated chlorophyll a (Chl a) were determined during four cruises carried out in 2008 and 2010. The distribution of Chl a in this geographical location showed a high degree of temporal variation. Chl a concentrations were highest in autumn, approximately three times higher than those in summer and winter. Microphytoplankton was the dominant contributor, accounting for 66.9% of the Chl a concentration in autumn 2008. In summer and spring 2008, nano-sized cells dominated the phytoplankton population throughout the study region. During the winter cruise, two different areas of water were found, characterized by (1) low salinity and high nutrient content and (2) high salinity and low nutrient content; nano- and picophytoplankton co-dominated the first area, while microphytoplankton dominated the second. It is arguable that grazing could have played a role in determining phytoplankton community size structure in winter. Nutrient concentrations were assumed not to limit phytoplankton growth during the investigation period. Size-differential capacity in competing for the resources available under different hydrodynamic conditions seemed to be the major factor in determining seasonal variation in the structure of the phytoplankton communities. High N:P ratios in the Pearl River estuary had major implications for nutrient pollution control. Our results indicated that studies of phytoplankton size structure provide greater insight into phytoplankton dynamics and are necessary to better manage water quality in the Pearl River estuary.

关键词：微微型浮游植物季节变化珠江口叶绿素a浓度水动力条件结构尺寸分离浮游植物群落

Allelopathic Interactions Between the Tropical Macrophyte Enhalus acoroides and Epibenthic HAB Dinoflagellate Prorocentrum concavum

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Journal of Ocean University of China 2022年第6期21卷 1656-1668页

作者： LIU Hui ZOU Jian XIE Hang ZHENG Chengzhi lu songhui Research Center of Harmful Algae and Marine Biology College of Life Science and TechnologyJinan UniversityGuangzhou 510362China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519000China Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632China

A benthic harmful dinoflagellate bloom caused by Prorocentrum concavum occurred at Xincun Bay,a lagoon characterized by a tropical seagrass ecosystem in the southern China,in summer *** abiotic and biotic factors may affect the abundance dynamics of *** of the biotic factors,allelopathy,is known to be especially common among aquatic species and is suggested to be an economical and environmentally-friendly way to eliminate Benthic Harmful Algal Blooms(BHABs).To investigate the possible allelopathic interactions between seagrasses and ***,a field survey was conducted to study the cell densities of *** on four major substrates over 12 *** laboratory,fresh Enhalus acoroides leaves and a crude aqueous extract of dry *** leaves were added to the culture of *** respectively to assess possible effects on the growth and photosynthesis activities of *** *** results showed that the average abundance of *** on *** leaves was statistically lower than that on the sediment outside the seagrass meadow and that on Thalassia hemperichii *** the growth and photosynthesis activities of *** cells were inhibited in the two experiments,which can be attributed to the release and production of allelochemicals by *** results offer new insights into the interaction between the submerged seagrass *** and the benthic harmful algal bloom dinoflagellate ***,which can influence the abundance dynamics of *** and provide an alternative for reducing potential threat of BHABs.

关键词： allelopathy Prorocentrum concavum Enhalus acoroides growth photosynthesis inhibition

Temporal and Spatial Variations of Abundance of Phycocyaninand Phycoerythrin-Rich Synechococcus in Pearl River Estuary and Adjacent Coastal Area

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Journal of Ocean University of China 2016年第5期15卷 897-904页

作者： JIANG Tao CHAI Chao WANG Jifang ZHANG Ling CEN Jingyi lu songhui Key Laboratory of Sustainable Development of Marine Fisheries of Ministry of Agriculture Yellow Sea Fisheries Research Institute Chinese Academy of Fishery Sciences Qingdao Engineering Research Center for Rural Environment Qingdao Agricultural University College of Life Science and Technology Jinan University

Three surveys were carried out in Pearl River Estuary and adjacent coastal area in May, August, and November, 2013, to investigate the temporal and spatial variations of abundance of phycoerythrin-rich Synechococcus(PE-rich SYN) and phycocyanin-rich Synechococcus(PC-rich SYN). The effects of environmental factors on the alternation of the different Synechococcus groups were also elucidated. PE-rich SYN was detected in three surveys, whereas PC-rich SYN was detected in May and August, but not in November. The highest abundances of PE-rich SYN and PC-rich SYN were recorded in August and May, with mean values of 74.17×103 and 189.92×103 cells m L-1, respectively. From May to November, the relative abundance of PE-rich SYN increased, whereas that of PC-rich SYN declined. PE-rich and PC-rich SYN presented similar horizontal distributions with high abundance in the southern estuary in May, and in the western estuary in August. The abundances of PE-rich and PC-rich SYN were high at 27–32℃and salinity of 10–20. PC-rich SYN was not detected at < 24℃, and PC:PE-rich SYN decreased in abundance with salinity increase. When less than 20 mg L-1, suspended particulate matter(SPM) was helpful for Synechococcus growth. PE-rich SYN decreased in abundance when the concentration of dissolved inorganic nitrogen increased in May and November, and the concentration of phosphate increased in November. However, PC-rich SYN abundance and nutrients showed no correlation. Principal component analysis and regression analysis indicated that PE-rich SYN significantly correlated with the principal components that were affected by environmental factors.

关键词： Pearl nutrients suspended declined dissolved abundance ammonium inorganic estuary salinity

A re-investigation of the bloom-forming unarmored dinoflagellate Karenia longicanalis(*** umbella)from Chinese coastal waters

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Journal of Oceanology and Limnology 2018年第6期36卷 2202-2215页

作者： WANG Jianyan CEN Jingyi LI Si lu songhui CHAN Kin-Ka JIANG Tao LEI Xiangdong Department of Science Research Beijing Museum of Natural History College of Life Science and Technology Jinan University Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes Jinan University Marine Biological Section Department of BiologyUniversity of Copenhagen School of Science & Technology Open University of Hong Kong Key Laboratory of Sustainable Development of Marine Fisheries Ministry of AgricultureYellow Sea Fisheries Research InstituteChinese Academy of Fishery Sciences Wenzhou Marine Environmental Monitoring Center Station State Oceanic Administration

The dinoflagellate genus K arenia is known for recurrent harmful blooms worldwide. However, species diversity of the genus is generally overlooked owing to the difficulty of identifying small unarmored dinoflagellates. We have established four clonal cultures of K arenia longicanalis isolated from the type locality, Hong Kong harbor(strain HK01) and other three locations along the Chinese coasts(strains YB01, DT01, and NJ01). The morphology of the strain was studied by light and scanning electron microscopy(LM and SEM) and the pigment composition analyzed by high-performance liquid chromatography. We provide the first molecular data of K. longicanalis based on the large subunit(LSU) rRNA gene sequence and internal transcribed spacer(ITS). The four strains showed identical LSU rDNA sequences with a similarity of 99.4% to the holotype of K arenia umbella(strain KUTN05) from Australia. In the ITS phylogeny, the sequence of K. umbella branched between the Chinese strains of K. longicanalis. A careful comparison of the morphology of K. longicanalis and K. umbella reveals the similarity in the diagnostic characters. Diff erences may appear due to the sample treatment for SEM. We conclude that K. umbella is a junior synonym of K. longicanalis.

关键词： harmful algal blooms(HABs) phytoplankton morphology phylogeny large subunit(LSU)rRNA internal transcribed spacer(ITS)

Karlodinium elegans sp. nov. (Gymnodiniales, Dinophyceae), a novel species isolated from the East China Sea in a dinofl agellate bloom

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Journal of Oceanology and Limnology 2021年第1期39卷 242-258页

作者： Jingyi CEN Jianyan WANG Lifen HUANG Yarou LIN Guangmao DING Yuzao QI songhui LÜ Research Center of Harmful Algae and Marine Biology Jinan UniversityGuangzhou 510632China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519000China Department of Science Research Beijing Museum of Natural HistoryBeijing 100050China Fujian Fishery Resources Monitoring Center Fuzhou 350003China Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632China

Abstract On May 24–29,2019,a harmful algal bloom occurred in Pingtan coastal areas,Fujian,southeast China,and caused mass mortality of cage-cultured fi *** clonal cultures of an unknown naked dinofl agellate were set up from seawater samples taken during the *** cultures were examined for morphological features,ultrastructure characters,photosynthetic pigments,the large subunit(LSU)of the rRNA gene,and the internal transcribed spacer(ITS)sequences,as well as acute toxicity *** cell was unarmored,small-sized,and ovoid,and was characterized by elaborate striations on the epicone and *** nucleus was large,ellipsoid to oval or kidney-shaped,and centrally located in the cell.A long linear apical groove originated above the sulcus in the ventral epicone and extended to the dorsal *** elongate,slit-like“ventral pore”was located on the left of the epicone,well away from the apical *** chloroplasts were yellowish brown,numerous,band like,and irregularly distributed in the cell *** was the main accessory pigment *** topology reconstructed on partial LSU rDNA showed that the unknown dinofl agellate branched as a sister species to Karlodinium sp.(strain IFR981&IFR797,from France)and Karlodinium corrugatum(strain KDGSO08,from Australia),with genetic divergences of 0.6%and 3.3%,*** on the morphological and molecular phylogenetic analysis,we describe the novel dinofl agellate as Karlodinium elegans ***.A toxicity assay revealed that the clonal culture of ***(strain PTB601)had no adverse eff ect on brine shrimp(Artemia salina)and marine medaka(Oryzias melastigma),indicating it may not be a toxic species.

关键词： Karlodinium Kareniaceae harmful algal bloom toxicity dinofl agellate

Distribution and germination of viable diatom resting stage cells in sediments of the East China Sea

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Acta Oceanologica Sinica 2010年第5期29卷 121-128页

作者： ZHANG Yuyu lu songhui ZHANG Chuansong GAO Yahui Key Laboratory of Ministry of Education for Coast and Wetland Ecosystems School of Life Sciences Xiamen University Xiamen 361005 China Research Center for Harmful Algae and Aquatic Environment Jinan University Guangzhou 510632 China College of Life Science South China Normal University Guangzhou 510631 China College of Chemistry and Chemical Engineering Ocean University of China Qingdao 266100 China

The abundance and temporal patterns of viable diatom resting stage cells in sediments of the East China Sea in 2006 have been *** abundance of viable resting stages was enumerated with the most probable number（MPN） ***,25 diatom species（including varieties） belonging to 16 genera were *** resting stage cells were common,on the order of 103 to 106 cells/g dry *** abundant taxa included Skeletonema marina,***,Chaetoceros curvisetus and Thalassiosira spp.,with Skeletonema accounting for 83.3% of the *** effects of temperature（10,15,20,25 ℃）,salinity（20,25,30,35 psu） and light intensity（0,300,4 000,8 000 lux） on the germination of resting stages in sediment samples were also *** results showed that light intensity had a significant positive effect on the germination of diatom resting stage cells（p 〈0.01） and that diatoms could not germinate in *** and salinity had no noticeable effects on the *** present study suggests that there are abundant diatom resting cells in sediments of the East China Sea,which could serve as a ＂seed bank＂ in the phytoplankton population succession and contribute to the initiation of algal blooms.

关键词： diatom germination MPN resting stages seed bank sediment