Consequences of eutrophication in the management of water resources in Mediterranean reservoirs: A case study of Lake Cedrino (Sardinia, Italy)

Padedda, Bachisio Mario; Sechi, Nicola; Lai, Giuseppina Grazia; Mariani, Maria Antonietta; Pulina, Silvia; Sarria, Marco; Satta, Cecilia Teodora; Virdis, Tomasa; Buscarinu, Paola; Lugliè, Antonella Gesuina Laura

doi:10.1016/j.gecco.2017.08.004

Cited by 87 publications

(42 citation statements)

References 54 publications

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“…These results clearly support the substantial literature describing the association of cyanobacterial blooms with elevated inorganic N and P (e.g., [9,11,14,[88][89][90]), and are comparable to patterns documented in freshwater lakes across the globe, e.g., Lake Cedrino in Italy [91], Lake Erie in the United States [18], and Lake Taihu in China [92].…”

Section: Role Of Eutrophication On Cyanobacterial Blooms In Vancouversupporting

confidence: 88%

“…At the height of the late summer cyanobacterial blooms in Vancouver Lake, cyanobacterial carbon biomass reached as high as 20 µ g L −1 , with total chl a concentrations often exceeding 750 µ g L −1 . These levels are substantially higher than many other large lakes plagued by harmful cyanobacterial blooms, e.g., Lake Agawam in New York, USA [70], Lake Cedrino in Italy [91], Lake Our experimental results also demonstrated that during this period prior to the blooms, cyclopoid copepods shifted away from consuming heterotrophic ciliates and dinoflagellates (which had been promoting diatom growth through a trophic cascade) to a diet more dominated by diatoms and other algae. This effectively reduced algal competition with cyanobacteria for limited nitrogen.…”

Section: Interactive Effects Of Eutrophication and Zooplankton Trophimentioning

confidence: 44%

“…At the height of the late summer cyanobacterial blooms in Vancouver Lake, cyanobacterial carbon biomass reached as high as 20 µg L −1 , with total chl a concentrations often exceeding 750 µg L −1 . These levels are substantially higher than many other large lakes plagued by harmful cyanobacterial blooms, e.g., Lake Agawam in New York, USA [70], Lake Cedrino in Italy [91], Lake Taihu in China [102], Lake Erie in USA [103,104], and Lake Okeechobee in Florida, USA [105]. Yet the duration of the peaks in chl a biomass in Vancouver Lake was typically only 8-12 weeks, often shorter than in these other lakes.…”

Section: Interactive Effects Of Eutrophication and Zooplankton Trophimentioning

confidence: 86%

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Beyond Eutrophication: Vancouver Lake, WA, USA as a Model System for Assessing Multiple, Interacting Biotic and Abiotic Drivers of Harmful Cyanobacterial Blooms

Rollwagen‐Bollens

Lee

Rose

et al. 2018

Water

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Eutrophication of lakes and reservoirs has contributed to an increase in the magnitude and frequency of harmful cyanobacterial blooms; however, the interactive effects of nutrient availability (eutrophication) and other abiotic and biotic drivers have rarely been comprehensively studied in the field. We undertook an eight-year (2005-2013) research program that assessed the interaction of multiple factors driving cyanobacterial blooms in Vancouver Lake, a large, shallow eutrophic lake in Washington, USA. Our program consisted of nearly continuous monthly or weekly monitoring of water quality and plankton community composition over eight years, as well as multiple zooplankton grazing experiments over three years. We found a relatively consistent seasonal succession of phytoplankton and zooplankton assemblages, and a pattern of interacting factors influencing cyanobacterial bloom dynamics. Typically, a combined effect of decreased dissolved inorganic nitrogen (N), a sudden increase of dissolved inorganic phosphorus (P), and a cascading effect of zooplankton grazing created a 'perfect storm' of conditions that promoted the rapid proliferation of cyanobacteria over the two to three weeks before a bloom. At the blooms' peaks, cyanobacterial carbon biomass reached as high as 20 µg L −1 , with total [chl a] often exceeding 750 µg L −1. In the weeks following the blooms' peaks, [PO 4-P] and [NH 4-N] dropped and copepod feeding rates fell to near zero, whereas microzooplankton grazing rates reached their maxima. Microzooplankton grazing impact, combined with low nutrient availability, then drove down cyanobacteria abundance. Vancouver Lake serves as a model for understanding multiple, interacting drivers of cyanobacterial bloom dynamics in shallow, temperate lakes, and is therefore an important system in which to investigate new questions related to the science and management of harmful algal blooms.

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Section: Role Of Eutrophication On Cyanobacterial Blooms In Vancouversupporting

confidence: 88%

Section: Interactive Effects Of Eutrophication and Zooplankton Trophimentioning

confidence: 44%

“…At the height of the late summer cyanobacterial blooms in Vancouver Lake, cyanobacterial carbon biomass reached as high as 20 µg L −1 , with total chl a concentrations often exceeding 750 µg L −1 . These levels are substantially higher than many other large lakes plagued by harmful cyanobacterial blooms, e.g., Lake Agawam in New York, USA [70], Lake Cedrino in Italy [91], Lake Taihu in China [102], Lake Erie in USA [103,104], and Lake Okeechobee in Florida, USA [105]. Yet the duration of the peaks in chl a biomass in Vancouver Lake was typically only 8-12 weeks, often shorter than in these other lakes.…”

Section: Interactive Effects Of Eutrophication and Zooplankton Trophimentioning

confidence: 86%

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Beyond Eutrophication: Vancouver Lake, WA, USA as a Model System for Assessing Multiple, Interacting Biotic and Abiotic Drivers of Harmful Cyanobacterial Blooms

Rollwagen‐Bollens

Lee

Rose

et al. 2018

Water

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“…This work showed that, during the decade 2006-2015, significant multiannual changes occurred in both environmental and phytoplankton variables in Bidighizu Lake, more in summer than during the other seasons. Our results confirmed those reported from other LTER studies in Sardinian reservoirs (Mariani et al 2015, Pulina et al 2016, Padedda et al 2017. In the Mediterranean climate, winters are mild and wet and summers are warm-to-hot dry, whereas spring and autumn are more variable (Lionello 2012).…”

Section: Discussionsupporting

confidence: 92%

Multiannual decrement of nutrient concentrations and phytoplankton cell size in a Mediterranean reservoir

Pulina¹,

Lugliè²,

Mariani³

et al. 2019

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Reservoirs are primary water resources for many uses in the Mediterreanean region and need dedicated studies for understanding the complexity of their dynamics particularly vulnerable to local and global stressors. This study focused on phytoplankton variations in relation to seasonal environmental changes on a multiannual time scale (2006–2015) at a Mediterranean eutrophic reservoir (Bidighinzu Lake, Italy) belonging to the Italian, European and International Long Term Ecological Research networks. Phytoplankton cell density, volume and biomass and chlorophyll a concentrations were analysed together with meteo-climatic, hydrological, physical and chemical variables to detect trends and correlations. The period under study was also compared with previous years to assess the presence of significant differences in the environmental and planktonic compartments. Multiannual changes were more pronounced in summer than in the other seasons during the decade under study. The most conspicuous environmental changes were a significant decrease in summer nutrient concentrations in the reservoir and a simultaneous anthropic pressure reduction in the watershed. In addition, the mixing zone and euphotic zone ratio also increased. Multiannual changes in summer phytoplankton composition consisted of an increased density of smaller Bacillariophyceae and Cyanophyceae, which replaced larger species of the same phytoplankton classes. This resulted in opposite trends of total phytoplankton cell density (increasing) and mean phytoplankton cell volume (decreasing) over the study years. The nutrient decrement was statistically the strongest environmental driver of the phytoplankton changes observed in the reservoir. However, the mixing zone and the euphotic zone ratio and water temperature also significantly affected the multiannual phytoplankton variations. Therefore, we conclude that the success of small cell-sized phytoplankton in Bidighinzu Lake was most probably due to the synergic interactions of more environmental forces related to changing anthropic pressures and climate variability. Our results highlight the importance of long-term monitoring of reservoirs in the Mediterranean basin, especially in semi-arid regions where the need and scarcity of high quality water will be further exacerbated due to the global climate change.

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“…In addition, the nutrient substance in the water causes rapid growth of algae, which in turn, has a serious impact on water quality [2]. In severe cases, it can lead to the death of fish and other aquatic organisms.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Ampholytic Flocculant CPCTS-g-P (CTA-DMDAAC) and Its Flocculation Properties for Microcystis Aeruginosa Removal

et al. 2018

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Abstract:The ampholytic chitosan based flocculant carboxylated chitosan graft-(3-chloro-2-hydroxypropyl) trimethylammonium chloride-dimethyl diallyl ammonium chloride (CPCTS-g-P (CTA-DMDAAC)) was synthesized by photo polymerization using carboxylated chitosan (CPCTS), 3-chloro-2-chloropropyltrimethylammonium chloride (CTA) and dimethyldiallylammonium chloride (DMDAAC) as the cationic co-monomers. The effects of monomer concentration, the ratio of CPCTS and cationic monomers, cationic degree, initiator time, photoinitiator concentration, and pH value on the properties of CPCTS-g-P (CTA-DMDAAC) were studied. The microcystis aeruginosa that was cultured in laboratory was used for CPCTS-g-P (CTA-DMDAAC) flocculation tests. The effects of CPCTS-g-P (CTA-DMDAAC) dosage, pH value and G value on flocculation performance were investigated. The maximum removal rate of chlorophyll-a (Chl-a) and chemical oxygen demand (COD) that were obtained by CPCTS-g-P (CTA-DMDAAC) were 98.8% and 96.5% under the conditions of dosage 4 mg/L, pH 7 and G value 200 s −1 , respectively. The flocculation experiments showed that chitosan-based flocculant CPCTS-g-P (CTA-DMDAAC) had better flocculation performance than commercially available flocculants cationic polyacrylamide (CPAM), Polyferric Sulfate (PFS), and polymeric aluminium (PAC).

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Consequences of eutrophication in the management of water resources in Mediterranean reservoirs: A case study of Lake Cedrino (Sardinia, Italy)

Cited by 87 publications

References 54 publications

Beyond Eutrophication: Vancouver Lake, WA, USA as a Model System for Assessing Multiple, Interacting Biotic and Abiotic Drivers of Harmful Cyanobacterial Blooms

Beyond Eutrophication: Vancouver Lake, WA, USA as a Model System for Assessing Multiple, Interacting Biotic and Abiotic Drivers of Harmful Cyanobacterial Blooms

Multiannual decrement of nutrient concentrations and phytoplankton cell size in a Mediterranean reservoir

Synthesis and Characterization of Ampholytic Flocculant CPCTS-g-P (CTA-DMDAAC) and Its Flocculation Properties for Microcystis Aeruginosa Removal

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