Environmental variables involved in the development of bloom-forming cyanobacteria in a meso-to-eutrophic reservoir

Willame, Raphaël; Thys, Isabelle; Jacquet, Véronique; Verbanck, Michel; Cauchie, Henri-Michel; Hoffmann, Lucien

doi:10.1127/1864-1318/2008/0126-0229

algol_stud

2008

DOI: 10.1127/1864-1318/2008/0126-0229

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Environmental variables involved in the development of bloom-forming cyanobacteria in a meso-to-eutrophic reservoir

Raphaël Willame¹,

Isabelle Thys²,

Véronique Jacquet³

et al.

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Cited by 3 publications

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Two-year monitoring of Cryptosporidium parvum and Giardia lamblia occurrence in a recreational and drinking water reservoir using standard microscopic and molecular biology techniques

Helmi

Skraber²,

Burnet³

et al. 2010

Environ Monit Assess

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Starting in 2006, a monitoring of Giardia lamblia and Cryptosporidium parvum occurrence was conducted for 2 years in the largest drinking water reservoir of Luxembourg (Esch-sur-Sûre reservoir) using microscopy and qPCR techniques. Parasite analyses were performed on water samples collected from three sites: site A located at the inlet of the reservoir, site B located 18 km downstream site A, at the inlet of the drinking water treatment plant near the dam of the reservoir and site C where the finished drinking water is injected in the distribution network. Results show that both parasites are present in the reservoir throughout the year with a higher occurrence of G. lamblia cysts compared to C. parvum oocysts. According to our results, only 25% of the samples positive by microscopy were confirmed by qPCR. (Oo)cyst concentrations were 10 to 100 times higher at site A compared to site B and they were positively correlated to the water turbidity and negatively correlated to the temperature. Highest (oo)cyst concentrations were observed in winter. In contrast, no relationship between the concentrations of (oo)cysts in the reservoir and rain events could be established. Though a correlation has been observed between both parasites and faecal indicators in the reservoir, some discrepancies highlight that the latter do not represent a reliable tool to predict the presence/absence of these pathogenic protozoa. In summer 2007, the maximal risk of parasite infection per exposure event for swimmers in the reservoir was estimated to be 0.0015% for C. parvum and 0.56% for G. lamblia. Finally, no (oo)cysts could be detected in large volumes of finished drinking water.

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Two-year monitoring of Cryptosporidium parvum and Giardia lamblia occurrence in a recreational and drinking water reservoir using standard microscopic and molecular biology techniques

Helmi

Skraber²,

Burnet³

et al. 2010

Environ Monit Assess

View full text Add to dashboard Cite

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Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil)

Oliveira¹,

Ara

Moreira

et al. 2014

An. Acad. Bras. Ciênc.

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This study investigated the water quality in an urban eutrophic reservoir in Northeastern Brazil, considering the influence of seasonality. Monthly, samples were collected in the sub-surface reservoir. The following abiotic variables were analyzed: temperature, pH, dissolved oxygen, apparent color, turbidity, conductivity, fluoride, total nitrogen, chlorides, total dissolved solids, total hardness, iron, copper, manganese, aluminum, chlorophyll-a and phaeophytin. Total and thermotolerant coliforms were analyzed according to APHA (2012). Cyanobacteria density was quantified through its biomass. The data were analyzed using one-way ANOVA and Pearson correlation test. Higher values mean phytoplankton biomass (26.3mm 3 .L -1 ) occurred in the dry season, especially Planktothrix agardhii and Geiterinema amphibium, which occurred in 100% of samples. High trophic state index was detected throughout the year. Seasonality exerted some influence on both biotic and abiotc variables, leading to changes in water quality of the reservoir.

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<b>Cyanobacteria community in two tropical eutrophic reservoirs in northeastern Brazil

Oliveira

Silva

Costa

et al. 2015

Acta Sci. Biol. Sci.

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ABSTRACT. This study investigated the effect of seasonality on the Cyanobacteria community in two tropical eutrophic reservoirs in northeastern Brazil. Monthly samplings were conducted in the sub-surface of reservoirs. The following abiotic variables were analyzed: apparent color, turbidity, conductivity, alkalinity, calcium, magnesium, sodium, potassium, sulfate, total phosphorous, ammonia, nitrate, nitrite, chlorides, total hardness and chlorophyll-a, according to APHA (2012). Cyanobacteria density was quantified through biomass. Data were analyzed using one-way ANOVA and Redundancy Analysis (RDA). Higher mean values of Cyanobacteria biomass occurred in the dry (9.9mm ) season in Jucazinho and Carpina reservoirs, respectively, especially Planktothrix agardhii, Cylindrospermopsis raciborskii and Geiterinema amphibium, which occurred in 100% of the samples. RDA analysis revealed that the variables nitrite, ammonia, conductivity, calcium, sulfate, chlorides and alkalinity influenced most the Cyanobacteria community in both reservoirs. High trophic state index was observed throughout the year. Seasonality affected both biotic and abiotic variables.Keywords: abiotic parameters, phytoplankton, seasonality.Comunidade de cianobactérias em dois reservatórios eutróficos e tropicais no nordeste do Brasil RESUMO. Este estudo investigou o efeito da sazonalidade sobre a comunidade de cianobactérias em dois reservatórios eutróficos tropicais no nordeste do Brasil. Mensalmente, amostras foram coletadas na subsuperfície dos reservatórios. Foram analisados os seguintes fatores abióticos: cor aparente, turbidez, condutividade, alcalinidade, cálcio, magnésio, sódio, potássio, sulfato, fósforo total, amônia, nitrato, nitrito, cloretos, dureza total e clorofila-a, de acordo com APHA (2012). A densidade de cianobactérias foi quantificada por meio de sua biomassa. Os dados foram analisados usando Anova (one-way) e Análise de Redundância (RDA). Maiores valores médios de biomassa de cianobactérias ocorreram na estação seca (9,9 mm ) nos reservatórios de Jucazinho e Carpina, respectivamente, especialmente Planktothrix agardhii, Cylindrospermopsis raciborskii e Geitlerinema amphibium que ocorreram em 100% das amostras. A análise de RDA revelou que os parâmetros nitrito, amônia, condutividade, cálcio, sulfato, cloretos e alcalinidade foram mais influentes na comunidade de Cyanobacteria em ambos os reservatórios. Elevado índice de estado trófico foi detectado durante todo o ano. A sazonalidade exerceu influência tanto nas variáveis bióticas como abióticas.Palavras-chave: parâmetros abióticos, fitoplâncton, sazonalidade.

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Environmental variables involved in the development of bloom-forming cyanobacteria in a meso-to-eutrophic reservoir

Cited by 3 publications

References 0 publications

Two-year monitoring of Cryptosporidium parvum and Giardia lamblia occurrence in a recreational and drinking water reservoir using standard microscopic and molecular biology techniques

Two-year monitoring of Cryptosporidium parvum and Giardia lamblia occurrence in a recreational and drinking water reservoir using standard microscopic and molecular biology techniques

Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil)

<b>Cyanobacteria community in two tropical eutrophic reservoirs in northeastern Brazil

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