Дисертації з теми "Cyanobacterial bloom"
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Tran, Thi Thu Huong, Trung Kien Nguyen, Thi Thuy Thi Nguyen, Phuong Thu Ha, Thi Phuong Quynh Le, Van Binh Do, Thi Hai Van Dinh, Quang Huy Trinh, and Thi Thuy Duong. "Nanoparticles as a control for cyanobacterial bloom." Technische Universität Dresden, 2016. https://tud.qucosa.de/id/qucosa%3A32610.
Повний текст джерелаMục đích của nghiên cứu này là khảo sát độc tính của vật liệu nano đồng được tổng hợp bằng phương pháp khử hóa học và ảnh hưởng của các yếu tố môi trường đến sinh trưởng và phát triển của quần xã thực vật nổi (chủ yếu là chi Microcystis) trong nước hồ Tiền phú dưỡng, tại Hà Nội, Việt Nam. Các thông số phân tích bao gồm: thủy lý (pH và độ đục), hóa học (hàm lượng amoni, photphat và hàm lượng đồng kim loại), sinh học (hàm lượng chất diệp lục, mật độ tế bào). Đặc trưng của vật liệu được xác định bằng các phương pháp quang phổ UV-VIS, XRD, SEM và TEM. Vật liệu nano đồng có dạng hình cầu, kích thước đồng nhất từ 20 đến 40 nm. Kết quả thử nghiệm sau 8 ngày cho thấy các mẫu có bổ sung vật liệu nano đồng ức chế sinh trưởng quần xã thực vật nổi ở nồng độ 1mg/l. Mật độ quần xã thực vật nổi và chi Microcystis trong mẫu xử lý với CuNPs đã giảm tương ứng sau 8 ngày từ 647.037 và 467.037 xuống còn 381.111 và 202.592.
Du, Plooy Schalk Jacobus. "Ecophysiology and nutrient uptake mechanisms facilitating the prolonged bloom persistence by Cyanothece sp. in Lake St Lucia, South Africa." Thesis, Nelson Mandela Metropolitan University, 2017. http://hdl.handle.net/10948/7344.
Повний текст джерелаTuttle, Taylor A. "Characterization of the Persistent Cyanobacterial Bloom, Planktothrix, in Sandusky Bay, Lake Erie." Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1435180971.
Повний текст джерелаAkins, Leighannah. "Understanding the relationship between bacterial community composition and the morphology of bloom-forming Microcystis." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1543502274681124.
Повний текст джерелаLange, Erik David. "Investigation of Microcystis Cell Density and Phosphorus in Benthic Sediment and Their Effect on Cyanobacterial Blooms on Western Lake Erie in the Summer of 2009." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1272581269.
Повний текст джерелаLu, Songhui. "Ecological studies of phytoplankton and harmful algal blooms in Junk Bay, Hong Kong." Click to view the E-thesis via HKUTO, 2001. http://sunzi.lib.hku.hk/hkuto/record/B42576209.
Повний текст джерелаWang, Jia Ph D. Massachusetts Institute of Technology. "Structural dynamics of community gene expression In a freshwater cyanobacterial bloom over a day-night cycle." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/70769.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 124-131).
Studies of community gene expression, or metatranscriptomics, provide a powerful approach for quantifying changes in both the taxonomic composition (structure) and activity (function) of complex microbial systems in response to dynamic environmental conditions. We have used next-generation Illumina sequencing to characterize the metatranscriptome of a tropical eutrophic drinking water reservoir dominated by the toxigenic cyanobacterium Microcystis aeruginosa over a day-night cycle. Cyanobacterial blooms are a major problem in eutrophic lakes and reservoirs, negatively impacting the ecology of the water body through oxygen depletion upon bloom decay and in some cases through production of toxins. Waterborne Cyanobacterial toxins pose a public health risk through drinking and recreational exposure. The frequency of harmful Cyanobacterial blooms (CyanoHABs) is predicted to increase due to warming regional climates and increases in non-point source pollution due to urban expansion. CyanoHABs represent complex consortia of Cyanobacteria that live in association with diverse assemblages of heterotrophic and anoxygenic- photosynthetic bacteria, archaea, microbial Eukaryotes (algae, protozoa, and fungi) as well as viruses and zooplanktonic grazers. Water sampling was carried out at six time points over a 24 hour period to capture variability associated with changes in the balance between phototrophic and heterotrophic activity. Total RNA was extracted and subjected to ribosomal depletion followed by cDNA synthesis, sequencing, and quality control, generating 493,468 to 678,064 95-101 bp reads per sample. Hierarchical clustering of transcription profiles supported sorting of samples into two clusters corresponding to "day" and "night" collection times. Annotation of reads through the MGRAST pipeline (Metagenomics- Rapid Annotation using Subsystem Technology) revealed that the community taxonomic composition was relatively constant throughout the day-night cycle and was dominated by transcripts with highest identity to members of the phyla Cyanobacteria, Proteobacteria, Firmicutes, Actinobacteria and Bacteroidetes (in decreasing order) where Microcystis transcripts represented 15.3 to 25.6% of the total Bacterial transcriptomes (Eave=10~ ). Community transcripts were enriched with genes from the Cyanobacterial photosynthetic KEGG pathway during the day (p=0.004). In contrast, Proteobacterial transcripts were enriched at night (20.4% of the total Bacterial transcriptome compared to 14.3% in the day, p=0.039). Metatranscriptomic quantification of microbial community gene expression in a Cyanobacterial bloom dominated by M. aeruginosa contributes to a fundamental understanding of nutrient and energy cycling over a day-night cycle. A better understanding of the structure, function, and interaction between members of the complex communities that support the proliferation of toxigenic Cyanobacteria will improve our ability to prevent and control CyanoHABs.
by Jia Wang.
S.M.
Ha, Joo Hyun. "A study on characteristics of microcystin-producing cyanobacterial bloom and microcystin production using real-time PCR." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/124526.
Повний текст джерелаHipsher, Carissa. "Assessment of Chromophoric Dissolved Organic Matter and Thamnocephalus platyurus as Tools to Monitor Cyanobacterial Bloom Development and Toxicity." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1566210122121367.
Повний текст джерелаWang, Kai. "INTERACTIONS OF CYANOBACTERIA AND CO-OCCURRING MICROORGANISMS DURING CYANOBACTERIAL HARMFUL ALGAL BLOOMS." Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent1619622253977384.
Повний текст джерелаDeng, Li. "Cyanophages of bloom-forming cyanobacteria." Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492570.
Повний текст джерелаMacário, Inês Adriana Patrunilho Efe. "Stepwise strategy for monitoring cyanobacterial blooms." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12148.
Повний текст джерелаO desenvolvimento de blooms cianobacterianos pode representar um risco para a saúde pública e, num contexto de alterações climáticas, o desenvolvimento de grandes concentrações destes organismos pode ser potenciado. Portugal, à semelhança de outros países, adoptou a metodologia para a monitorização de cianobactérias proposta pela Organização Mundial de Saúde, que considera a clorofila a e a densidade celular, como indicadores da presença de cianobactérias. Contudo, tendo em conta as limitações destes indicadores, o presente trabalho visa propor uma estratégia rápida, simples e menos onerosa, a médio prazo, para a monitorização de blooms cianobacterianos em sistemas de água doce utilizados para uso recreativo. Esta estratégia propõe uma abordagem sequencial: i) fluorimetria (análise de pigmentos); ii) determinação da clorofila a, observação microscópica e enumeração das espécies cianobacterianas dominantes; iii) técnicas moleculares, baseadas em PCR, para avaliação do potencial tóxico; e v) quantificação das cianotoxinas, apenas quando necessário. O trabalho incluiu a determinação de valores de referência para ficocianina, através de fluorimetria, por forma a poder aplicá-los na estratégia de monitorização proposta. Para esta determinação foram utilizadas as espécies Microcystis aeruginosa, Nostoc muscorum e Cylindrospermopsis raciborskii. Para validação da estratégia de monitorização proposta, foram amostrados nove sistemas lênticos de água doce, do norte, centro e sul de Portugal. Os dados de parâmetros físico-químicos e biológicos das amostras foram integrados, de modo a obter informação acerca do contexto ecológico do desenvolvimento de blooms. A determinação dos valores de referência de ficocianina mostrou diferenças inter-específicas, suportando a necessidade de existirem vários valores de referência, que possam ser utilizados de acordo com a espécie cianobacteriana dominante num bloom. A metodologia proposta, ao ser faseada, permitiu ir excluindo amostras à medida que o perigo de desenvolvimento de um bloom tóxico foi sendo descartado, tendo sido detetadas apenas 2 amostras tóxicas, na Lagoa da Vela e na albufeira da barragem da Aguieira (ambas com blooms de Microcystis spp.). Esta estratégia de monitorização provou ser uma mais-valia para o desenvolvimento de planos de gestão de prevenção e controlo do crescimento excessivo de cianobactérias em lagos e albufeiras.
The massive growth of cyanobacteria into blooms has risks to the public health and, under a context of climate change, the development of these organisms may be enhanced. Portugal, like other countries, has adopted the methodology proposed by the World Health Organization which uses chlorophyll a and cell density as indicators for cyanobacterial density assessment. However, these indicators have several limitations. Therefore, this study aims to propose a strategy for a faster, easier and more cost-effective monitoring of cyanobacterial blooms in lentic freshwater bodies used for recreation purposes. This strategy considers several steps, proposed sequentially: i) fluorometry (pigment analysis); ii) chlorophyll a determination, microscopic observation and enumeration of dominant cyanobacterial species; iii) PCR-based methodologies to screen the potential for cyanotoxins production; and v) cyanotoxins quantification, only if required. The study included the determination of phycocyanin thresholds though fluorometry in order to use them in the proposed monitoring strategy. The species used for this determination included Microcystis aeruginosa, Nostoc muscorum and Cylindrospermopsis raciborskii. For the validation of the monitoring strategy proposal, nine lentic freshwater bodies from northern, central and southern Portugal were sampled. The physico-chemical and biological parameters were integrated in order to provide information about the ecological context for the recorded cyanobacterial blooms. The determined phycocyanin thresholds showed inter-specific differences, highlighting the need for the proposal of not just a general threshold value for phycocyanin, but specific values, according to the dominant bloom-forming cyanobacterial species. The sequential stepwise strategy, allowed the exclusion of samples as the danger of the development of a toxic bloom is being discarded, remaining only two toxic samples at Vela Lake and Aguieira reservoir (both with Microcystis spp. blooms). This monitoring strategy proved to be a valuable and cost-effective tool for an early warning of cyanobacterial blooms, which may be important for the development of effective management plans to prevent and control the massive growth of cyanobacteria in target water bodies.
Duan, Hongmei. "Monitoring and characterization of toxic cyanobacterial blooms." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66915.
Повний текст джерелаUn suivi de la dynamique des populations de Microcystis qui ont la capacité de produire des toxines a été effectué à la baie Missisquoi (partie canadienne du lac Champlain) à l'aide d'outils moléculaires. Deux types de membranes ont été utilisés : un filtre standard (GF/C) pour quantifier les microcystines, et un filtre pour capturer les bactéries. Cette étude a démontré que le filtre standard (GF/C) est approprié pour déterminer les concentrations de microcystines, mais qu'il n'est pas adéquat pour caractériser avec des techniques moléculaires, les populations de bactéries et de cyanobactéries. Une bonne corrélation a été obtenue en 2006, entre les concentrations de microcystines déterminées par les méthodes ELISA et HPLC et le nombre de copies du gène mcyD (impliqué dans la biosynthèse des microcystines). Les résultats ont donc démontré le potentiel de cette méthode de PCR en temps réel, ciblant le gène mcyD, pour la détection et le suivi des proliférations de cyanobactéries qui produisent des toxines. La présence du pathogène fécal Escherichia coli a été évaluée afin de déterminer la relation entre l'application de lisier et de fumier et l'augmentation dans l'eau du lac, des nutriments qui causent les proliférations. Une bonne corrélation a été obtenue entre l'application du lisier et du fumier et les précipitations ainsi qu'entre les concentrations élevées d'azote dans le lac, suggérant qu'une meilleure gestion des matières fertilisantes est nécessaire pour réduire les apports de nutriments dans la baie Missisquoi.
Lee, Seungjun. "Microbiome and Virome Dynamics in Lakes Impacted by Cyanobacterial Harmful Algal Blooms and the Fate of Cyanobacteria and Cyanotoxin in Crops and Soil." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1513690700478319.
Повний текст джерелаRichardson, Ralph William. "Florida Bay Microalgae Blooms: Physiological Characteristics and Competitive Strategies of Bloom Forming Cyanobacteria and Diatoms of Florida Bay." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000369.
Повний текст джерелаZhang, Feng. "Cyanobacterial blooms: causes, innovative monitoring and human health impact." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1405800137.
Повний текст джерелаBaptista, Ana Mafalda Saraiva. "Chemical factors related with freshwater blooms of cyanobacteria." Master's thesis, Porto : [s.n.], 2008. http://hdl.handle.net/10216/64181.
Повний текст джерелаBaptista, Ana Mafalda Saraiva. "Chemical factors related with freshwater blooms of cyanobacteria." Dissertação, Porto : [s.n.], 2008. http://catalogo.up.pt/F?func=find-b&local_base=FCB01&find_code=SYS&request=000103009.
Повний текст джерелаKinsman, Robin. "Molecular and structural studies of gas vesicles of bloom-forming cyanobacteria." Thesis, University of Bristol, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240813.
Повний текст джерелаDash, Padmanava. "SeaWiFS Algorithm for Mapping Phycocyanin in Incipient Freshwater Cyanobacterial Blooms." Bowling Green State University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1120594611.
Повний текст джерелаJaffee, Brian Alexander. "Using Oxygen Depletion and Chlorophyll-a as Proxies for Estimates of Cyanobacteria Blooms to Create Predictive Lake Erie Hazardous Algae Bloom Models." Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1435241581.
Повний текст джерелаLips, Inga. "Abiotic factors controlling the cyanobacterail bloom ocurrence in the gulf on finland /." Online version, 2005. http://dspace.utlib.ee/dspace/bitstream/10062/940/5/lips.pdf.
Повний текст джерелаHogfors, Hedvig. "Summer cyanobacterial blooms in the Baltic Sea - implications for copepod recruitment." Doctoral thesis, Stockholms universitet, Systemekologiska institutionen, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-81680.
Повний текст джерелаAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Manuscript. Paper 5: Manuscript.
DeMarco, Jonathan R. "Cyanobacterial Blooms in Chautauqua Lake, NY: Nutrient Sources and Toxin Analyses." Bowling Green State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1625052848648708.
Повний текст джерелаAnselmo, António Eduardo Vicente. "The use of Corbicula fluminea in the remediation of cyanobacterial blooms." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/22395.
Повний текст джерелаCyanobacterial blooms are frequentetly linked to eutrophication in waterbodies and can be a problem for other organisms since some cyanobacteria are toxic, not only to aquatic organisms, but also to all those ingesting contaminated water or organisms that had previously accumulated toxins in their tissues. Studies exploring new strategies to control/remediate affected waters are thus of major relevance. This motivated the present study, where the assessment of the suitability of the freshwater bivalve Corbicula fluminea as a bioremediator agent within such scenarios was aimed. Although C. fluminea is a problematic invasive species, mostly in Europe and North America, its distribution is already wide, thus the exploitation of its powerful filtration capacities can become a valuable add-on in this pest’s management via compensating damage resulting from its impacts in invaded ecosystems. In a first stage, microscopic characterisation and genetic typing were carried out over a set of laboratory cyanobacteria cultures. These represent the most common taxa composing blooms that have been monitored in national waterbodies, including strains potentially producing cianotoxins. Some of the taxa considered were Anabaena cylindrica, Microcystis and Oscillatoriales. In a second stage, the capacity of the clams to filter and ingest each cyanobacteria was assessed, using short-term assays where each cyanobacteria was offered to the clams respecting densities typically found in blooms. The results often showed low filtration rates, especially compared to those reached as a green microalgae (Raphidocelis subcapitata) was offered. However, chlorophyll a mass balance analysis in the test system (Chl a filtered, retained in pseudofaeces and non-filtered) allowed some important outcomes. The agreggation and settling of filtered cyanobacteria promoted by C. fluminea through the production of pseudofaeces was notorious. This process resembles the use of flocculants to remove organic matter and microrganisms from the water column into the bottom for further aspiration, thus opening avenues to continuing assessing the possibility of using C. fluminea as a remediation for cyanobacterial blooms.
Os blooms cianobacterianos estão associados à eutrofização em massas de água. Isto pode ser um problema para os restantes organismos, já que algumas cianobactérias podem ser tóxicas, não só para organismos aquáticos, como para os que ingiram água contaminada ou que acumulem toxinas nos seus tecidos. É assim da maior relevância o desenvolvimento de estudos que explorem formas de controlar/remediar águas afetadas pelo problema. Tal constituiu a principal motivação do presente estudo, cujo objetivo geral foi a avaliação da capacidade de um bivalve de água doce, Corbicula fluminea, enquanto agente bioremediador nestes cenários. Embora C. fluminea seja uma espécie invasora problemática na Europa e América do Norte, a sua distribuição já é muito alargada, pelo que o aproveitamento do seu elevado poder de filtração poderá ser uma boa estratégia de gestão da peste via compensação de danos resultantes do seu impacto em ecossistemas invadidos. Numa primeira fase do trabalho foi caracterizado (com recurso a ferramentas de microscopia e de tipagem genética) um conjunto de culturas laboratoriais de cianobactérias representativo da composição mais comum dos blooms ocorrentes em massas de água nacionais, incluindo espécies potencialmente produtoras de cianotoxinas. Alguns dos taxa de cianobactérias consideradas foram Anabaena cylindrica; Microcystis ou Oscillatoriales. Na segunda fase do trabalho foi avaliada a capacidade de C. fluminea para filtrar e ingerir cada uma das cianobactérias, em ensaios de curta duração com cada cianobactéria, oferecida em densidade típica de bloom. Os resultados obtidos revelaram baixas taxas de filtração em muitos casos, sobretudo quando comparadas com as taxas de filtração atingidas quando foi oferecida uma microalga verde (Raphidocelis subcapitata). No entanto, a análise de balanço de massa de clorofila a no sistema (filtrada e ingerida, retida em pseudofezes e não filtrada) permitiu algumas anotações importantes. Foi notória a relevância da agregação e sedimentação de cianobactérias filtradas promovida por C. fluminea, através das pseudofezes. Este processo tem semelhanças com o que é conseguido com a aplicação de químicos floculantes, usados para remover matéria orgânica e organismos microscópicos indesejados da coluna de água (por sedimentação e posterior aspiração), assim abrindo caminho para a continuação da exploração da possibilidade de utilização de C. fluminea como agente de remediação de blooms cianobacterianos.
Cong, Danni. "Cyanobacteria blooms: from impacts on the environment to management strategies." Kansas State University, 2015. http://hdl.handle.net/2097/18930.
Повний текст джерелаDepartment of Biological & Agricultural Engineering
Philip L. Barnes
Bloom-forming cyanobacteria are harmful to both environment and public health because of the release of water soluble toxins. This report provides a broad overview of cyanobacteria and cyanotoxins and the current state of knowledge about the bloom control management. Cyanobacteria blooms usually flourish in warm, lentic, and eutrophic waters. Several environmental factors such as temperature, nutrients, light intensity, and turbulence can affect cyanobacterial growth and the formation of bloom. Cyanobacteria can synthesize multiple types of toxins, which cause human and animal toxications worldwide. Cyanobacterial blooms also cause detrimental effects on aquatic ecosystems, and the taste and odor problems in drinking water supplies. Due to the adverse effects, treatments that are used for removing both cyanobacterial cells and aqueous cyanotoxins should be carried out once cyanobacterial blooms occur in freshwaters. Strategies based on physical, chemical, and biological methods are carried out to remove the cyanobacteria and cyanotoxins. All of these strategies have both advantages and disadvantages: some physical treatment methods can remove cyanotoxins within the intact molecules, but the cost is usually high and further processing is needed; some chemical methods are cheap and can degrade the cyanotoxins, however, the toxicological characterization of the chemical and the by-products needs to be investigated; some biological treatments are more environmentally friendly, but the long reaction time and some other external factors also pose some problems that affect the efficiency of the treatments. The paper concludes that the key to success is to find a reasonable balance between those advantages and disadvantages, and the specific conditions of each unique aquatic ecosystem should be taken into consideration. As well, some suggestions are also proposed for the further development of more robust monitoring and management strategies.
Jonasson, Sara. "Monitoring the cellular phosphate status in bloom-forming cyanobacteria of the Baltic Sea /." Stockholm : Department of Botany, Stockholm university, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1302.
Повний текст джерелаCoyle, Sadie Marie. "Investigations of microcystins (cyanobacterial peptide toxins) : detection, purification and analysis." Thesis, Robert Gordon University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360091.
Повний текст джерелаTrowbridge, Peter J. "Forecasting cyanobacteria in Lake Rockwell using historical data." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1510311070018351.
Повний текст джерелаRen, Jie. "Mapping Cyanobacterial Blooms in the Western Basin of Lake Erie using MERIS." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1336150800.
Повний текст джерелаGorham, Tyler James. "Investigation of cyanobacterial blooms as an environmental risk factorfor various cancer types." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1494055981679989.
Повний текст джерелаLawson, Gabriella Marie. "Seasonal Nutrient Limitations of Cyanobacteria, Phytoplankton, and Cyanotoxins in Utah Lake." BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/9183.
Повний текст джерелаMedeiros, Leonardo Rafael. "Unraveling knowledge gaps about cyanobacterial blooms and proposing an alternative for lake restoration." PROGRAMA DE P?S-GRADUA??O EM ECOLOGIA, 2016. https://repositorio.ufrn.br/jspui/handle/123456789/22293.
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A eutrofiza??o artificial tem sido considerada um problema de grande preocupa??o nos ecossistemas aqu?ticos em todo o mundo. Desde 1960, os avan?os cient?ficos t?m sido feitos a fim de desenvolver t?cnicas que atenuem os efeitos da eutrofiza??o. V?rios procedimentos f?sicos, qu?micos e biol?gicos podem ser usados e combinados para recuperar lagos de flora??es de cianobact?rias, como a aplica??o de um floculante combinado com argila natural ou modificada. No entanto, a efic?cia dos solos de regi?es ?ridas na mitiga??o de flora??es ? desconhecida para lagos artificiais brasileiros. Neste artigo, apresentamos uma an?lise bibliom?trica da evolu??o de publica??es sobre flora??es de cianobact?rias e identificamos registros que diretamente objetivam superar a ocorr?ncia dessas flora??es. Al?m disso, avaliamos, por meio de experimentos laboratoriais, o efeito do uso combinado do floculante policloreto de alum?nio (PAC) e um solo local do entorno do lago (LS), como lastro, no controle de flora??es de cianobact?rias em um lago raso da regi?o semi?rida do Brasil. A pesquisa bibliom?trica foi conduzida com o banco de dados "Web of Science" atrav?s da fun??o de busca ?TS = ((cyanobacteri* or blue green algae or cyanoprokariote or cyanophyceae) and (mass accumulation or bloom or domina*))?, de 1969 a junho de 2016. Realizamos uma an?lise de freq??ncia de palavras-chave e quantificamos o n?mero de registros com uma abordagem de restaura??o. Al?m disso, foram realizadas tr?s s?ries de experimentos em tr?s momentos com flora??es diferentes em composi??o e biomassa no Reservat?rio Armando Ribeiro Gon?alves. Nossa pesquisa revelou que os estudos sobre as flora??es de cianobact?rias aumentaram exponencialmente e seu impacto quantitativo nas ci?ncias aqu?ticas aumentou significativamente ao longo dos anos (F = 97,52; p <0,0001). Os EUA se destacam como a na??o mais produtiva, seguida pela China e pa?ses europeus. A China aumentou impressionantemente sua contribui??o para essa ?rea, superando os EUA nos ?ltimos cinco anos. Estudos sobre Microcystis e toxinas, tais como microcistinas, s?o tend?ncias de investiga??o, devido a sua omnipresen?a e suas consequ?ncias negativas hist?ricas. Tamb?m enfatizamos a necessidade de mais estudos com o objetivo de desenvolver t?cnicas para resolver e/ou mitigar a quest?o das flora??es. Em vista disso, nossos experimentos revelaram que o uso de PAC e LS teve um efeito not?vel na biomassa de cianobact?rias da coluna de ?gua em todas as amostragens, reduzindo at? 90% a concentra??o de clorofila-a. O uso de LS sozinho foi ineficiente para remover a biomassa de algas azuis. Em duas amostragens, a combina??o de floculante e lastro apresentou a mesma efic?cia que o uso apenas de PAC. Mesmo assim, o uso de LS ? importante para garantir a sedimenta??o. Combinado com PAC, o LS foi um lastro t?o eficiente em remover cianobact?rias quanto uma argila modificada comercialmente dispon?vel (Phoslock?). Embora LS in natura tenha liberado quantidades consider?veis de f?sforo e n?o apresentou capacidade de adsor??o de P, tal argila conseguiu adsorver quantidades moderadas de f?sforo dissolvido ap?s a mat?ria org?nica ter sido removida por muflagem. Este estudo mostra que LS ? uma alternativa economicamente vi?vel e sustent?vel para ser utilizada como a??o de manejo em reservat?rios apresentando flora??es na regi?o semi?rida do Brasil.
Artificial eutrophication has been considered a problem of major concern in aquatic ecosystems around the world. Since 1960, scientific advances have been made in order to develop techniques that mitigate the effects of eutrophication. Several physical, chemical and biological procedures can be used and combined to recover lakes from cyanobacterial blooms, such as the application of a flocculant combined with natural or modified clay. However, the efficacy of local dryland soils in mitigating blooms is unknown for Brazilian manmade lakes. In this paper, we present a bibliometric analysis of the evolution of publications about cyanobacterial blooms and identify records that directly aim to overcome the occurrence of these blooms. Also, we evaluate, through laboratory experiments, the effect of the combined use of flocculent polyaluminum chloride (PAC) and a local soil from the lake catchment (LS), as ballast, in controlling cyanobacterial bloom in a shallow lake of the semiarid region of Brazil. The bibliometric research was conducted with the ?Web of Science? database through the search function ?TS = ((cyanobacteri* or blue green algae or cyanoprokariote or cyanophyceae) and (mass accumulation or bloom or domina*))?, from 1969 to June 2016. We performed a keyword frequency analysis and quantified the number of records with a restoration approach. Besides, three sets of experiments were performed in three sampling occasions with different bloom compositions and biomass in Armando Ribeiro Gon?alves Reservoir. Our study revealed that studies about cyanobacterial blooms increased exponentially and their quantitative impact on the aquatic sciences increased significantly along the years (F = 97.52; p < 0.0001). The USA stands out as the most productive nation, followed by China and European countries. China has impressively increased its contribution to this area, surpassing the USA in the last five years. Studies about Microcystis and toxins, such as microcystins, are trends in research, due to their ubiquitousness and historical negative consequences. We also emphasize the need for more studies aiming at developing techniques to solve and/or mitigate the issue of blooms. In view of this, our experiments revealed that the use of PAC and LS had a remarkable effect on cyanobacterial biomass in the water column in all samplings, reducing up to 90% top chlorophyll-a concentration. The use of LS alone was inefficient to settle blue-green-algal biomass. In two samplings, the combination of flocculant and ballast exhibited the same efficacy as the use of solely PAC. Even so, the use of LS is important to ensure sedimentation. Combined with PAC, LS was as efficient a ballast to remove cyanobacteria as a commercially available modified clay (Phoslock?). Althugh LS in natura released considerable amounts of phosphorus and did not present P adsorption capacity, it managed to adsorb some dissolved phosphorus after organic matter was removed through muffling. This study shows that LS is a cheap, feasible and environment-friendly alternative to be used as a management action in reservoirs undergoing blooms in the semiarid region of Brazil.
Brunkalla, Roberta Joann. "Influence of Mixing and Buoyancy on Competition Between Cyanobacteria Species in Upper Klamath Lake." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3998.
Повний текст джерелаGorney, Rebecca Michelle. "Trophic Dynamics and Cyanobacteria Blooms In Shallow Eutrophic Bays Of Lake Champlain." ScholarWorks @ UVM, 2014. http://scholarworks.uvm.edu/graddis/3.
Повний текст джерелаMcNamara, Shari J. "Using multispectral sensor WASP-LITE to analyze harmful algal blooms /." Online version of thesis, 2007. http://hdl.handle.net/1850/5856.
Повний текст джерелаWallström, Jenny. "Public’s behavioural responses to cyanobacterial blooms in Sweden : economic impact and demand for information." Thesis, Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-30824.
Повний текст джерелаAndrade, Fabiana Martins de. "Determinação de cianotoxinas em amostras de florações de cianobactérias coletadas em pesque-pagues e pisciculturas situadas na região do Alto Mogi." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/75/75132/tde-12112009-153503/.
Повний текст джерелаThe rapid growth of aquaculture in the state of São Paulo may be causing a number of environmental problems. The contribution to the eutrophication process is among the consequences of these undertakings, given that the tanks used in fish farming as well as the changes around these establishments are becoming eutrophic systems due to excessive nutrients. A frequent consequence of eutrophication in waters is the massive development of cyanobacteria.The occurrence of these blooms induces severe problems, as Microcystis aeruginosa, the most widespread distributed cyanobacteria, which can produce microcystin-LR. Toxic effects of MC have been described in liver, lungs, stomach, and intestine. Deaths in wildlife, livestock and human beings were also associated with microcystin exposition, which can occur directly by ingestion, inhalation, contact, intravenous inoculation of contaminated water (hemodialysis) or indirectly, by the consumption of animals, as fish and mollusks, the major ingestors of cyanobacteria and its toxins. Thus we need a program to control the quality of water tanks and reservoirs and also the fish breeded there, as cyanobacteria blooms have been found in various water bodies. This study focused on the determination of the cyanotoxins microcystin-LR, using techniques such as solid phase extraction and liquid chromatography for the detection and quantification of microcystin-LR in samples of cyanobacteria blooms. Tests performed with solid phase extraction showed that this procedure is not necessary for all the samples because there were cases where no difference was obtained in interfering peaks near the retention time of the analyte studied. As the parent of such samples are very complex and vary greatly, because the extracts contained too much coextrated material that interfered in the LC-UV detection, and depending on the way in which it is recommended to be assessed, case by case, the solid phase extraction needs to be promoted, because it is a process that demands a longer period of analysis and consequently an increase in costs. A liquid chromatography method was established and validated, which is deemed capable of providing reproducible and reliable data, by testing for selectivity, limit of detection and quantification, linearity, precision, accuracy and recovery, in accordance with the acceptance criteria of Resolution No. 899 of 2003 of ANVISA. The detection limit of the method was set at 0.1 µg mL-1, and the lower limit of quantification at 0.5 µg mL-1 determined according to the signal to noise ratio proposed by the Validation Guide of Bioanalytical Methods, ANVISA. Quantification of microcystin-LR was performed using the matrix-matched method, which minimizes and/or offsets the effect of possible matrix interference or present in the sample. The analytical curve obtained y = 1.5888 + 21.849 x, with a coefficient of correlation of 0.997 shows a good linearity. Real aquaculture samples were analyzed that were detected and quantified according to the method developed.
Morimoto, Daichi. "Comprehensive studies on transcriptional dynamics of cyanoviruses infecting a bloom-forming cyanobacterium Microcystis aeruginosa." Kyoto University, 2019. http://hdl.handle.net/2433/242690.
Повний текст джерела0048
新制・課程博士
博士(農学)
甲第21813号
農博第2326号
新制||農||1066(附属図書館)
学位論文||H31||N5185(農学部図書室)
京都大学大学院農学研究科応用生物科学専攻
(主査)教授 左子 芳彦, 教授 澤山 茂樹, 准教授 吉田 天士
学位規則第4条第1項該当
Wu, X. "The effects of ultrasonic treatment on cyanobacteria in surface waters." Thesis, Coventry University, 2010. http://curve.coventry.ac.uk/open/items/d0d31d7e-fe64-436a-88b3-24c2b4656eba/1.
Повний текст джерелаMoore, David. "Studies on the life cycle of the cyanobacterium Cylindrospermopsis raciborskii, focusing on akinete differentiation and germination /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18987.pdf.
Повний текст джерелаTate, Rachel Shanae. "Landsat Collections Reveal Long-Term Algal Bloom Hot Spots of Utah Lake." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8585.
Повний текст джерелаHampel, Justyna J. "Ammonium cycling and nitrifier community composition in eutrophic waters affected by cyanobacterial harmful algal blooms." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1558619262925446.
Повний текст джерелаCrafton, Elizabeth Ann. "Investigation and Management of Cyanobacteria-dominated Harmful Algal Blooms in a Drinking Water Source." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1539688257233302.
Повний текст джерелаMuñoz, Ramos Valentina. "Relationship between toxic cyanobacterial blooms, physico-chemical factors and multiple source excreta contamination in affected watershed." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=117190.
Повний текст джерелаLa baie Missisquoi (BM) est un écosystème d'eau douce tempérée situé dans un bassin versant où les activités agricoles sont importantes. La baie est fréquemment exposée à la prolifération de Microcystis, des cyanobactéries qui ont un potentiel toxique. La dynamique des populations de cyanobactéries est influencée par une multitude de facteurs qui peuvent varier d'un site à l'autre. Une caractérisation spécifique des facteurs qui sont responsables des floraisons est donc nécessaire afin de développer des mesures préventives et des stratégies de remédiation efficaces. C'est la première fois qu'une étude de biosurveillance combine des données de séquençage d'amplicons ARN ribosomal 16S à haut débit, la PCR en temps réel et des paramètres environnementaux d'échantillons qui ont été prélevés de façon spatio-temporelle pour identifier les facteurs qui causent les floraisons. De plus, le séquençage à haut débit d'amplicons ciblant l'ADN mitochondrial a été utilisé pour identifier qualitativement les sources potentielles de nutriments qui proviennent d'excréments d'origine animale. Une insistance a été accordée plus spécifiquement à 1) l'évaluation de l'existence d'un lien entre les nutriments provenant de sources externes et les périodes de floraison de cyanobactéries et 2) l'analyse in situ des impacts des facteurs environnementaux (particulièrement les concentrations d'azote (N) et de phosphore (P)) sur la structure des communautés de cyanobactéries, leur abondance et leur toxicité.Les concentrations de P et de N à la baie Missisquoi en 2009 étaient fortement corrélées avec l'abondance des cellules de cyanobactéries, des gènes de Microcystis (ARNr 16S et mcyD) ainsi qu'avec la concentration de microcystine intracellulaire. Les résultats suggèrent que les sources externes de nutriments telles que le ruissellement de surface et les excréments d'origine animale ont contribué de manière importante à la charge d'éléments nutritifs dans la baie et ainsi à la prolifération de cyanobactéries qui produisent des toxines. Ces conclusions ont été corroborées par la présence d'ADN mitochondrial d'hôtes non aquatiques et les liens entre les types de ruissellement de surface, les concentrations de nutriments, et les dénombrements de E.coli et de cyanobactéries. Les sources potentielles de nutriments provenant des excréments animaux dans la baie incluaient les rongeurs, les oiseaux, le bétail et les humains. Ces résultats indiquent que des efforts sont requis dans la baie Missisquoi pour contrôler la pollution provenant des excréments d'origine animale.Pendant la période de floraison, la communauté de cyanobactéries était principalement composée de Chroococcales et Nostocales. Les cyanobactéries du genre Microcystis étaient à la fois les principales porteuses du gène mcyD et les principales productrices de microcystine. Ce taxon a donc été le plus problématique pendant les fleurs d'eau. Les corrélations observées entre les facteurs environnementaux suggèrent que la dominance des Microcystis a été associée à l'augmentation des concentrations en nutriments, à un ratio TN:TP (masse) d'une valeur aux environs de 11:1, combinée à une hausse de température.Même si l'importance des concentrations et des ratios de nutriments sur la dynamique des cyanobactéries et des Microcystis a déjà été documentée, c'est la première fois qu'un ratio optimum pour le genre Microcystis est observé sur le terrain. Cette observation est en accord avec la théorie voulant que les ratios de nutriments soient importants pour déterminer la composition des espèces faisant partie de la communauté phytoplanctonique. La validité et le potentiel de prédiction de ce ratio optimum pour la dominance des Microcystis devraient être vérifiés à l'aide d'études à long terme, car il pourrait devenir un critère important pour développer des stratégies de gestion de nutriments qui permettraient d'éviter la prolifération de ce genre de cyanobactéries nocives.
Arthur, Karen E. "Ecotoxicology of the cyanobacterium Lyngbya majuscula and health implications for green sea turtles (Chelania mydas) /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18909.pdf.
Повний текст джерелаIsles, Peter D. F. "A Multiscale Analysis of the Factors Controlling Nutrient Dynamics and Cyanobacteria Blooms in Lake Champlain." ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/561.
Повний текст джерелаMotwani, Nisha H. "Trophic complexity of zooplankton–cyanobacteria interactions in the Baltic Sea : Insights from molecular diet analysis." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-116219.
Повний текст джерелаAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Accepted.
Prentice, Matthew James. "Temporal and spatial variations of cyanobacteria in Karori Reservoir, Wellington." The University of Waikato, 2008. http://hdl.handle.net/10289/2363.
Повний текст джерелаKennedy, Matthew R. "The Role of Microzooplankton and Mesozooplankton Grazing During the Planktothrix-Dominated Cyanobacterial Blooms in Sandusky Bay, Lake Erie." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1589546747826657.
Повний текст джерела