Drivers of water quality in a large water storage reservoir during a period of extreme drawdown

Baldwin, Darren S.; Gigney, Helen; Wilson, Jessica S.; Watson, Garth; Boulding, Amy N.

doi:10.1016/j.watres.2008.08.020

Cited by 68 publications

(41 citation statements)

References 21 publications

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“…The elevated concentrations of cyanobacteria in the Murray River between Lake Hume and Lake Mulwala in early 2007 were thought to have resulted from their physical transport from Lake Hume along the river downstream (9). Lake Hume experienced extreme drawdown in early 2007, having less than 4% of its capacity at the time, thus creating the specific conditions for a cyanobacterial bloom (8). Early 2009 was also a period of extreme drawdown for this reservoir, ranging from 10% to 2% of full capacity, which would have contributed to the March 2009 cyanobacterial bloom and potentially to the bloom in the river as far downstream as Corowa, seeded with A. circinalis from the lake.…”

Section: Discussionmentioning

confidence: 99%

Community Composition, Toxigenicity, and Environmental Conditions during a Cyanobacterial Bloom Occurring along 1,100 Kilometers of the Murray River

Al-Tebrineh

Merrick

Ryan

et al. 2012

Appl Environ Microbiol

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A cyanobacterial bloom impacted over 1,100 km of the Murray River, Australia, and its tributaries in 2009. Physicochemical conditions in the river were optimal to support a bloom at the time. The data suggest that at least three blooms occurred concurrently in different sections of the river, with each having a different community composition and associated cyanotoxin profile. Microscopic and genetic analyses suggested the presence of potentially toxic Anabaena circinalis, Microcystis flos-aquae, and Cylindrospermopsis raciborskii at many locations. Low concentrations of saxitoxins and cylindrospermopsin were detected in Anabaena and Cylindrospermopsis populations. A multiplex quantitative PCR was used, employing novel oligonucleotide primers and fluorescent TaqMan probes, to examine bloom toxigenicity. This single reaction method identified the presence of the major cyanotoxin-producing species present in these environmental samples and also quantified the various toxin biosynthesis genes. A large number of cells present throughout the bloom were not potential toxin producers or were present in numbers below the limit of detection of the assay and therefore not an immediate health risk. Potential toxin-producing cells, possessing the cylindrospermopsin biosynthesis gene (cyrA), predominated early in the bloom, while those possessing the saxitoxin biosynthesis gene (sxtA) were more common toward its decline. In this study, the concentrations of cyanotoxins measured via enzymelinked immunosorbent assay (ELISA) correlated positively with the respective toxin gene copy numbers, indicating that the molecular method may be used as a proxy for bloom risk assessment.

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Section: Discussionmentioning

confidence: 99%

Community Composition, Toxigenicity, and Environmental Conditions during a Cyanobacterial Bloom Occurring along 1,100 Kilometers of the Murray River

Al-Tebrineh

Merrick

Ryan

et al. 2012

Appl Environ Microbiol

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“…Assim, ocorrem prejuízos não apenas para a qualidade da água do reservatório, mas também para a fertilidade do solo quando áreas agrícolas são lixiviadas (HAREGEWEYN et al, 2008). Baldwin et al (2008) relataram uma diminuição da profundidade de um reservatório na Austrália devido a um período crítico de estiagem, o que provocou maior facilidade de mistura da coluna de água pela ação dos ventos e, consequentemente, maior disponibilidade de nutrientes. Os impactos de longos períodos de estiagem sobre reservatórios e sistemas de abastecimento de água potável, independentemente de sua localização geográfica, são uma preocupação em diversos países e foram discutidos por Watts et al (2012).…”

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Heterogeneidade espacial e variabilidade temporal do reservatório de Itupararanga: uma contribuição ao manejo sustentável dos recursos hídricos da bacia do rio Sorocaba (SP)

Cunha¹

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"A palavra é o meu meio de comunicação. Eu só poderia amá-la. Eu jogo com elas como se lançam dados: acaso e fatalidade. A palavra é tão forte que atravessa a barreira do som. Cada palavra é uma ideia. Cada palavra materializa o espírito.Quanto mais palavras eu conheço, mais sou capaz de pensar o meu sentimento. Devemos modelar nossas palavras até se tornarem o mais fino invólucro dos nossos pensamentos." Clarice LispectorDedico esta tese a todos os meus familiares e à Juliana, que nunca questionaram o mérito dos meus sonhos e sempre me incentivaram a buscá-los com perseverança, ainda que isso implique, em alguns momentos, abdicação de precioso tempo ao lado deles. AGRADECIMENTOSA gratidão é um dos mais nobres sentimentos humanos, pois representa o reconhecimento da importância da colaboração de outras pessoas para a realização das atividades cotidianas e a superação de desafios. Ninguém é o que é, ou conquista o que conquista, por merecimento exclusivo, mas sim por mérito compartilhado com outros indivíduos -que são os verdadeiros amigos, na mais genuína acepção da palavra. Por isso, tenho a oportunidade, neste momento, de expressar meus sinceros agradecimentos a pessoas que surgiram na minha vida, ao acaso ou não, há muito tempo ou recentemente, e com as quais tenho a satisfação de conviver.À Profª Maria do Carmo Calijuri, grande exemplo profissional, pela verdadeira amizade construída desde 2004, ano em que comecei a desenvolver projeto de iniciação científica, sob sua orientação, quando ainda cursava o primeiro ano de graduação em Engenharia Ambiental na EESC-USP. Pela força e confiança sempre transmitidas, pelo apoio incondicional, pela dedicação, pelo acolhimento, pelas longas e agradáveis conversas sobre a profissão e sobre a vida e pela oportunidade única de aprendizado e formação, deixo aqui registradas a minha admiração e a minha sincera gratidão. Tenha certeza que a amizade, o respeito e a cumplicidade serão eternos. , revealed the meso-eutrophic condition of the reservoir. The phytoplankton community structure and the high abundance of Chlorophyceae and Cyanobacteria as the dominant groups, especially the species Cylindrospermopsis raciborskii and Monoraphidium contortum, were associated with the possible co-limitation by nutrients and light availability in different spatial compartments of the reservoir, the hydraulic retention time, the circulation patterns within the water column and the interaction with zooplankton and macrophytes. The tributary rivers (Una, Sorocabuçu Sorocamirim) were recognized as point sources of pollution and as the main drivers of water quality degradation in the reservoir. Smaller relative importance was attributed to the diffuse sources (agricultural runoff). In order to aid in the local water resources management, the following topics were discussed: the role of the reservoir for retention or exportation of solids and nutrients, the water quality frequency curves and the proposal of a new Trophic State Index for subtropical reservoirs, the TSI sr .

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“…Although no data have been presented, lakes of similar characteristics in the UK have been shown to be stratified with a distinct thermocline developing during the summer period and a likely turnover in the autumn (Kay & McDonald 1980;De Cesare et al 2006;George et al 2007;Baldwin et al 2008;Elci 2008;Wilhelm & Adrian 2008;Caliskan & Elci 2009 The mains drinking water supply was treated by pressure filtration (aimed primarily at reduction of naturally occurring manganese) and disinfection by chlorination, and is more fully described in the accompanying paper by Mason et al (2010).…”

Section: Study Catchment and Mains Water Supplymentioning

confidence: 99%

Detection of Cryptosporidium species and sources of contamination with Cryptosporidium hominis during a waterborne outbreak in north west Wales

Chalmers

Robinson

Elwin

et al. 2009

Journal of Water and Health

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As part of investigations into the cause of a waterborne outbreak of Cryptosporidium hominis infection linked to a mains water supply, surface waters and wastewater treatment plants were tested for Cryptosporidium spp. Oocyst counts in base flow surface water samples ranged from nil to 29 per 10 l. Oocyst counts in effluent from a community wastewater treatment plant were up to 63 fold higher and breakout from one septic tank five logs higher. There were no peak (storm) flow events during the investigation. C. hominis, four named genotypes (cervine, muskrat II, rat, W19) and six new small subunit ribosomal RNA gene sequences were identified. Four of the new sequences were closely related to Cryptosporidium muskrat genotype I, one was closely related to the fox genotype and one to Cryptosporidium canis. C. hominis was found extensively in the catchment, but only at sites contaminated by wastewater, and in the treated water supply to the affected area. All were gp60 subtype IbA10G2, the outbreak subtype.Multiple routes of contamination of the reservoir were identified, resulting in persistent detection of low numbers of oocysts in the final water. This work demonstrates the utility of genotyping Cryptosporidium isolates in environmental samples during outbreak investigations.

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Drivers of water quality in a large water storage reservoir during a period of extreme drawdown

Cited by 68 publications

References 21 publications

Community Composition, Toxigenicity, and Environmental Conditions during a Cyanobacterial Bloom Occurring along 1,100 Kilometers of the Murray River

Community Composition, Toxigenicity, and Environmental Conditions during a Cyanobacterial Bloom Occurring along 1,100 Kilometers of the Murray River

Heterogeneidade espacial e variabilidade temporal do reservatório de Itupararanga: uma contribuição ao manejo sustentável dos recursos hídricos da bacia do rio Sorocaba (SP)

Detection of Cryptosporidium species and sources of contamination with Cryptosporidium hominis during a waterborne outbreak in north west Wales

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