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A comparison on the phytoremediation ability of triazophos by different macrophytes

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Journal of Environmental Sciences 2014年第2期26卷 315-322页

作者： Zhu Li Huiping Xiao Shuiping Cheng Liping Zhang Xiaolong Xie Zhenbin Wu state key laboratory of freshwater ecology and biotechnology Institute of Hydrobiology Chinese Academy of Sciences University of the Chinese Academy of Sciences Wuhan Yangtze Business University key laboratory of Yangtze River Water Environment Ministry of Education Tongji University

The strategy of choosing suitable plants should receive great performance in phytoremediation of surface water polluted by triazophos （O,O-diethyl-O-（1-phenyl- 1,2,4-triazol-3-base） sulfur phosphate, TAP）, which is an organophosphorus pesticide widespread applied for agriculture in China and moderately toxic to higher animal and fish. The tolerance, uptake, transformation and removal of TAP by twelve species of macrophytes were examined in a hydroponic system and a comprehensive score （CS） of five parameters （relative growth rate （RGR）, biomass, root/shoot ratio, removal capacity （RC）, and bio-concentration factor （BCF）） by factor analysis was employed to screen the potential macrophyte species for TAP phytoremediation. The results showed that Thalia dealbata, Cyperus alternifolius, Canna indica and Acorus calamus had higher RGR values, indicating these four species having stronger growth capacity under TAP stress. The higher RC loading in Iris pseudacorus and Cyperus rotundus were 42.11 and 24.63μg/（g ***）, respectively. The highest values of BCF occurred in A. calamus （1.17）, and TF occurred in Eichhornia crassipes （2.14）. Biomass and root/shoot ratio of plant showed significant positive correlation with first-order kinetic constant of TAP removal in the hydroponic system, indicating that plant biomass and root system play important roles in remediation of TAP. Five plant species including C. alternifolius, A. calamus, T. dealbata, C. indica and Typha orientalis, which owned higher CS, would be potential species for TAP phytoremediation of contaminated water bodies.

关键词： pesticide removal capacity relative growth rate bio-concentration factor transfer factor root/shoot ratio factor analysis

Effects of deep placement of fertilizer on periphytic biofilm development and nitrogen cycling in paddy systems

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Pedosphere 2021年第1期31卷 125-133页

作者： Yanhui ZHAO Xiong XIONG Chenxi WU state key laboratory of freshwater ecology and biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China University of Chinese Academy of Sciences Beijing 100049China

Periphytic biofilms are commonly presented at the water-soil interface in paddy fields. Different fertilization methods can affect the concentration and distribution of nutrients in paddy fields and thus affect the development of periphytic biofilms. In this study, the roles of periphytic biofilms in nitrogen(N) cycling in paddy systems and how they are affected by different fertilization methods were studied using microcosm experiments. Microcosms were prepared using soil samples from a paddy field and treated with surface and deep fertilization under light and dark conditions. Surface fertilization under light condition promoted the development of periphytic biofilms, while deep fertilization under dark condition inhibited their development. The development of periphytic biofilms increased the pH and dissolved oxygen levels in the overlying water. Surface fertilization resulted in high N concentrations in the overlying water and the topsoil layers, which enhanced NH3 volatilization and nitrification-denitrification but inhibited N fixation. The development of periphytic biofilms reduced NH3 volatilization loss but increased nitrification-denitrification loss and the overall N loss in the paddy system. The results from this work suggest that the presence of periphytic biofilms in paddy fields could increase N loss by 3.10%–7.11%. Deep fertilization is an effective method to retard the development of periphytic biofilms in the paddy system and can potentially increase the overall N use efficiency.

关键词： deep fertilization denitrification potential N loss N use efficiency NH3 volatilization paddy field

Essential roles of stat5.1/stat5b in controlling fish somatic growth

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Journal of Genetics and Genomics 2017年第12期44卷 577-585页

作者： Shuting Xiong Jie Mei Peipei Huang Jing Jing Zhi Li Jingliang Kang Jian-Fang Gui College of Fisheries Key Laboratory of Freshwater Animal Breeding Ministry of Agriculture Huazhong Agricultural University state key laboratory of freshwater ecology and biotechnology Institute of Hydrobiology Chinese Academy of Sciences University of the Chinese Academy of Sciences Medical Research Institute Wuhan University

Signal transducer and activator of transcription 5b（STAT5b） has been identified as a key downstream mediator of growth hormone（GH） signaling in somatic growth of mammalian. However, the corresponding homologue gene of Stat5b is unknown in fish species. In this study, we generated loss-offunction mutants in stat5.1 and stat5.2, two stat5 homologues existing in zebrafish. In stat5.1-deficient zebrafish, a significant reduction of body length and body weight was detected in the embryos/larvae and adults compared with the wild-type control fish, and sexual size dimorphism in adult zebrafish was also eliminated. However, the stat5.2-deficient zebrafish displayed a normal developmental phenotype during all lifespan. Chromatin immunoprecipitation combined with deep sequencing（Ch IP-seq） method was adopted to further investigate the potential transcriptional targets of Stat5 protein and cast much light upon the biological function of Stat5. We identified more than 800 genes as transcriptional targets of Stat5 during zebrafish embryogenesis. KEGG analysis indicated that the Stat5 target gene network is predominantly linked to the metabolic pathways, neuroactive ligand-receptor interaction and JAK-STAT signaling pathways. Further validation studies suggested that Stat5.1 protein could directly regulate the expression of gh1, and stat5.1-mutated zebrafish showed a reduction of gh1 mRNA level. In the present study, stat5.1 was revealed as the corresponding homologue gene of Stat5b in fish species. Additionally,we found a novel molecular interaction between Stat5.1/Stat5b and GH, and unraveled a positive feedback loop Stat5.1-GH-Stat5.1 which is necessary for somatic growth and body development in zebrafish.

关键词： Zebrafish Stat5 Body growth Sexual size dimorphism Growth hormone

Genetic structure and demographic histories of two sympatric Culter species in eastern China

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Journal of Oceanology and Limnology 2020年第2期38卷 408-426页

作者： XIONG Ying LI Wei YUAN Jing ZHANG Tanglin LI Zhongjie XIAO Wuhan LIU Jiashou state key laboratory of freshwater ecology and biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China University of Chinese Academy of Sciences Beijing 100049China

Geographic isolation is a key factor in shaping the genetic structure of many fish *** sympatric species,Culter alburnus and ***,are economically important fish that are widely distributed in China and have been recently used as new aquaculture *** used the mitochondrial DNA control region(CR)as a marker to investigate the genetic structure of the two *** analysis revealed two major lineages(Lineages I and II)that were highly consistent with geographical patterns for *** and *** on genetic distance,the Zhujiang(Pearl)River Basin(ZRB)populations potentially represented a cryptic subspecies,which might be differentiated as the result of strict geographic isolation,an earlier diverged event,or peripheral *** diversity analysis suggested that the Changjiang(Yangtze)River Basin(CRB)populations are located at,or near the core region of their origination,not only due to the larger population size at the CRB,but also their habitat diversity and suitability for its survival,and the genetic diversity dif ferences among basin populations were significant for the two ***,demographic analysis indicated that the two Culter species and most populations had undergone a period of population expansion during warm interglacial ***,the *** population of Huaihe River Basin(Weishan Lake)exhibited different patterns during the interglacial period,which may due to the latest diverged time of HRB and Weishan Lake located at the ***,the ZRB(in Songtao Reservoir)*** population showed no genetic diversity and had a unique haplotype,which could be treated as a special gene pool for species *** summary,geographic isolation is most likely responsible for the two Culter species distribution patterns.

关键词： Culter species drainage basin genetic differentiation geographic isolation

Spatiotemporal variations of internal P-loading and the related mechanisms in the large shallow Lake Chaohu

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Science China Earth Sciences 2006年第Z1期49卷 72-81页

作者： ZHANG Min XIE Ping XU Jun LIU Bingqin YANG Hong Donghu Ecosystem Experimental Station of Lake Ecosystems State Key Laboratory of Freshwater Ecology and Biotechnology of ChinaInstitute of HydrobiologyChinese Academy of SciencesWuhan 430072China

Spatiotemporal variations of P species and adsorption behavior in water column,interstitial water,and sediments were investigated in the large shallow eutrophic Lake ***(Ortho-P)and total phosphorus(TP)concentrations were significantly higher in the western part than in the eastern part of the lake,due to different nutrient inputs from the surrounding ***,particulate phosphorus(PP)concentration was in a similar spatial pattern to Ortho-P and TP concentrations,and also showed significantly positive correlation with the biomass of Microcystis,indicating more uptake and store of phosphorus by Microcystis than by other *** of pH and intensive utilization of P by phytoplankton were the main factors promoting P(especially Fe-P)release from the sediment to interstitial water during the cyanobacterial blooms in Lake *** dynamics in TP concentration,P species and adsorption behavior of the sediment,coupled with the statistical analyses,suggested that the spatial heterogeneity of P contents in the sediment was influenced by various factors,*** activities,soil geochemistry and mineral *** spite of similar TP contents in the sediments,increase in proportion of Fe-P concentration in the sediment may result in a high risk of P release.

关键词： eutrophication water column sediment phosphorus species sorption and release Lake Chaohu cyanobacterial blooms.

The ecological risks of hydrogen peroxide as a cyanocide:its effect on the community structure of bacterioplankton

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Journal of Oceanology and Limnology 2018年第6期36卷 2231-2242页

作者： LIN Lizhou SHAN Kun XIONG Qian ZHOU Qichao LI Lin GAN Nanqin SONG Lirong state key laboratory of freshwater ecology and biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China University of Chinese Academy of Sciences Beijing 100049China

Microcystis blooms are an environmental and ecological concern that has received a serious attention. Hydrogen peroxide(H_2O_2) is an environment-friendly cyanocide that is commonly used to control Microcystis blooms. While the ecological safety of H_2O_2 has been previously studied, its influence on bacterioplankton has not been investigated to date. In this study, we used mesocosm experiments to determine the influence of H_2O_2 on the dynamic changes of the community structure of bacterioplankton. By using deep-sequencing and metagenomics strategy we determined the community structures of phytoplankton and bacterioplankton assemblages that were dominated by M icrocystis at a highly eutrophic Dianchi Lake, China. The results showed that M icrocystis was more sensitive to H_2O_2 than other eukaryotic algae. More interestingly, application of H_2O_2 changed the community structure of bacterioplankton, evidenced by the emergence of F irmicutes as the dominant species in place of B acteroidetes and Proteobacteria. The H_2O_2 treatment resulted in the community of bacterioplankton that was primarily dominated by E xiguobacterium and Planomicrobium. Our results show that the abundance changed and the bacterioplankton diversity did not recover even after the concentration of H_2O_2 reached to the background level. Thus, the response of bacterioplankton must be considered when assessing the ecological risks of using H_2O_2 to control Microcystis blooms, because bacterioplankton is the key player that forms the basis of food web of aquatic environment.

关键词： hydrogen peroxide Microcystis bloom ecological risks bacterioplankton

Size-dependent responses of zooplankton to submerged macrophyte restoration in a subtropical shallow lake

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Journal of Oceanology and Limnology 2018年第2期36卷 376-384页

作者： ZENG Lei HE Feng ZHANG Yi LIU Biyun DAI Zhigang ZHOU Qiaohong WU Zhenbin state key laboratory of freshwater ecology and biotechnology Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China University of Chinese Academy of Sciences Beijing 100049 China

To explore the size-dependent responses of zooplankton to submerged macrophyte restoration, we collected macrophyte, zooplankton and water quality samples seasonally from a subtropical shallow lake from 2010 to 2012. Special attention was given to changes in rotifers and crustaceans （cladocerans and copepods）. The rotifers were grouped into three size classes （〈200 μm, 200μm-400μm, 〉400 μm） to explore their size-related responses to macrophyte restoration. The results showed that during the restoration, the annual mean biomass and macrophyte coverage increased significantly from 0 to 637 g/m2 and 0 to 27%, respectively. In response, the density and biomass of crustaceans and the crustacean-to-rotifer ratio increased significantly, while the rotifer density decreased significantly. Moreover, rotifers showed significant size- dependent responses to macrophyte restoration. Specially, rotifers 〈400 ~tm were significantly suppressed, while those≥400 μm were significantly encouraged. Overall, the population of large-sized zooplankton tended to boom, while that of small rotifers was inhibited during macrophyte restoration. Redundancy analysis （RDA） revealed positive correlations between macrophytes and crustaceans, rotifers and COD or Chl-a, but negative correlations between macrophytes and COD or Chl-a, and between crustaceans and Chl-a. Moreover, the results indicate that increased predation on phytoplankton by large-sized zooplankton might be an important mechanism for macrophyte restoration during development of aquatic ecosystems, and that this mechanism played a very important role in promoting the formation of a clear-water state in subtropical shallow lakes.

关键词： crustacean rotifer large-sized zooplankton subtropical shallow lakes

Sustainable fisheries in shallow lakes:an independent empirical test of the Chinese mitten crab yield model

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Chinese Journal of Oceanology and Limnology 2017年第4期35卷 894-901页

作者：王海军梁小民王洪铸 state key laboratory offreshwater ecology and biotechnology Institute of HydrobiologyChinese Academy of Sciences

Next to excessive nutrient loading,intensive aquaculture is one of the major anthropogenic impacts threatening lake *** China,particularly in the shallow lakes of mid-lower Changjiang(Yangtze) River,continuous overstocking of the Chinese mitten crab(Eriocheir sinensis) could deteriorate water quality and exhaust natural resources.A series of crab yield models and a general optimum-stocking rate model have been established,which seek to benefit both crab culture and the *** this research,independent investigations were carried out to evaluate the crab yield models and modify the optimum-stocking *** percentage errors(average 47%,median 36%) between observed and calculated crab yields were *** values were defined for adult crab body mass(135 g/ind.) and recapture rate(18%and 30%in lakes with submerged macrophyte biomass above and below 1 000 g/m^2)to modify the optimum-stocking *** based on the modified optimum-stocking model indicated that the actual stocking rates in most lakes were much higher than the calculated optimum-stocking *** implies that,for most lakes,the current stocking rates should be greatly reduced to maintain healthy lake ecosystems.

关键词： Chinese mitten crab sustainable fishery yield model optimum-stocking model independent test Changjiang lakes

Off-flavor compounds from decaying cyanobacterial blooms of Lake Taihu

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Journal of Environmental Sciences 2013年第3期25卷 495-501页

作者： Zhimei Ma Yuan Niu Ping Xie Jun Chen Min Tao Xuwei Deng freshwater ecology and biotechnology of China Institute of HydrobiologyChinese Academy of Sciences

The effect of cyanobacterial bloom decay on water quality and the complete degradation of cyanobacterial blooms in a short period were examined by an enclosure experiment in Gonghu Bay of Lake Taihu,*** quality parameters as well as taste and odor compounds during the breakdown of cyanobacterial blooms were *** showed that the decay of cyanobacterial blooms caused anoxic water conditions,decreased pH,and increased nutrient loading to the lake *** highest concentrations of dimethyl sulfide （DMS）,dimethyl trisulfide （DMTS）,and β-cyclocitral were observed in the anoxic water,at 62331.8,12413.3,and 1374.9 ng/L,respectively.2-Methylisoborneol was dominant during the live growth phase of cyanobacterial blooms,whereas DMS and DMTS were dominant during the decomposition *** oxygen,pH,and chlorophyll a were negatively correlated with DMS,DMTS,and β-cyclocitral,whereas total phosphorus,total nitrogen,and ammonium （NH4＋-N） were positively correlated with DMS,DMTS,β-cyclocitral,and β-*** experimental results suggested that preventing the anaerobic decomposition of cyanobacterial blooms is an important strategy against the recurrence of a malodor crisis in Lake Taihu.

关键词： cyanobacterial blooms decay taste and odor compounds Lake Taihu water crisis