A numerical index for evaluating phytoplankton response to changes in nutrient levels in deep mediterranean reservoirs

Marchetto, Aldo; Padedda, Bachisio Mario; Mariani, Maria Antonietta; Lugliè, Antonella Gesuina Laura; Sechi, Nicola

doi:10.4081/jlimnol.2009.106

Cited by 77 publications

(70 citation statements)

References 35 publications

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“…The reservoirs were classified as eutrophic (Cantonieria, Mulargia, Gusana, Monte Lerno, Benzone, Is Barrocus, Leni and Cucchinadorza), mesotrophic (Medio Fludendosa, Torrei, Sos Canales, Punta Gennarta) and hyper-eutrophic (Bidighinzu, Cixerri, Pranu Antoni) (Sechi & Lugliè 1992;Marchetto et al 2009) Crustacean zooplankton taxa composition Overall, we identified 21 crustacean zooplankton taxa, thirteen belonging to the Cladocera and eight to the Copepoda ( Fig. 2A).…”

Section: Resultsmentioning

confidence: 99%

“…Conductivity, DO, TN and RP were analyzed following Strickland & Parsons (1972) (Table 1). Data on the morphology, renewal time and trophy of all reservoirs were taken from previous studies (Sechi & Lugliè 1992Marchetto et al 2009). Qualitative samples were collected via vertical hauls with an Apstein zooplankton net (mesh size 200 µm), from 20 m depth to the surface, and preserved in 90% ethanol.…”

Section: Methodsmentioning

confidence: 99%

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First record of planktonic crustaceans in Sardinian reservoirs

Fadda

Marková²,

Kotlı́k³

et al. 2011

Biologia

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Sardinian man-made lakes are reservoirs of species richness, hosting zooplankton taxa from the Mediterranean region and North Africa. To provide a first record of the taxa composition and diversity of zooplankton communities, we sampled 15 reservoirs during [2008][2009], from the north of the island to the south, representative of a range of size, depth, renewal time, and trophy. The survey was complemented by seasonal sampling in one of the largest lakes studied. Water samples collected from surface to bottom provided data on hydrochemistry and trophy. Crustacean dormant stages were inspected from sediments of the richest, and most diverse, Lake Sos Canales. RDA suggested that productivity, water depth, renewal time and altitude were the main variables related to taxa composition. The ubiquitous Copidodiaptomus numidicus, and its persistence in the water column, resulted from the production of subitaneous eggs throughout the year, an adaptive strategy in perennial water bodies. Genetic analyses of DNA sequences of the diagnostic gene ND5 placed the Sardinian Daphnia pulex in the North American group. Moreover, the ND5 sequence found in Sardinia was identical with that of an asexual hybrid clone between the American D. pulex and American D. pulicaria that replaced native D. pulex throughout Africa. The presence of this ND5 haplotype in Sardinia shows that this invasive clone also poses an invasive threat to native populations in Europe.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

First record of planktonic crustaceans in Sardinian reservoirs

Fadda

Marková²,

Kotlı́k³

et al. 2011

Biologia

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“…Three phytoplankton composition metrics were proposed: the contribution of cyanobacteria (%) to total phytoplankton biovolume; the IGA (Índex de grups algals), also known as the Catalan Index (Catalan et al 2003); and the Mediterranean Phytoplankton Trophic Index (MedPTI; Marchetto et al 2009). These metrics have only been intercalibrated for deep and large reservoirs, but some could also be reliable in shallower reservoirs (Marchetto et al 2009) and thus could be suitable metrics for assessing the ecological status of the Pareja limno-reservoir under the WFD requirements.…”

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confidence: 99%

Phytoplankton and suitability of derived metrics for assessing the ecological status in a limno-reservoir, a Water Framework Directive nondefined type of Mediterranean waterbody

Molina‐Navarro

Martínez‐Pérez

Sastre-Merlín

et al. 2014

Lake and Reservoir Management

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“…Therefore a good water management plan is essential. Most of the Sardinian reservoirs were eutrophic (Total Nitrogen, 594-2057 μg L -1 ; Total Phosphorus, 23-180 μg L -1 ), with phytoplankton communities dominated by CB (Sechi and Lugliè, 1996;Begliutti et al, 2007;Marchetto et al, 2009 Cabras et al (2013) (Supplementary Tab. 2), which refer to the period of the monitoring activities described in this paper.…”

Section: Discussionmentioning

confidence: 99%

Cyanobacterial dynamics and toxins concentrations in Lake Alto Flumendosa, Sardinia, Italy

et al. 2017

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Seasonal blooms of cyanobacteria (CB) are a typical feature of Lake Alto Flumendosa (Sardinia, Italy). The waters of this lake are used for drinking water supply, for agricultural and industrial uses, and fish farming activities. Since cyanotoxins are not monitored in edible organisms, diet could be a relevant route of human exposure. CB also represent a threat for the health of wild and domestic animals that use lake water for beverage. Therefore, to characterize the CB community and assess the risk for human and animal population, CB dynamic, mcyB+ fraction, and microcystins (MCs) concentration have been followed monthly for 18 months, in three stations. Results confirmed the presence of several toxigenic species. Planktothrix rubescens dominated between August 2011 and April 2012 (3.5×106 cells L-1), alternating with Woronichinia naegeliana (8×106 cells L-1) and Microcystis botrys (9×105 cells L-1). Dolichospermum planctonicum was always present at low densities (104 cells L-1). MCs were detected, at values well below the 1 µg L-1 threshold of WHO for drinking water. The molecular analysis of mcyB gene for P. rubescens indicated the presence of a persistent toxic population (average 0.45 mcyB/16S rDNA). Highly significant linear regressions were found between P. rubescens and the sum of the demethylated MC variants, and between M. botrys and the sum of MC-LR and MC-LA, also when co-occurring, suggesting that these two species were responsible for different MC patterns production. The regression lines indicated a quite stable MC cell quota. However, in some spotted samples very different values were obtained for both MC concentrations and cell quota (from 10-fold lower to 30-40-fold higher than the ‘average’) showing an unexpected significant variability in the rate of toxin production. The relatively low cell densities during the monitoring period is consistent with the low-to absent MC contamination level found in trout muscle; however, the analytical method was affected by low recovery, probably due to MC-protein binding. Our results show that, during the study period, no risk of exposure for the human and animal population occurred. However, the persistence of a complex CB community characterised by a significant toxic fraction suggests the need for periodic monitoring activity. Particularly, the hidden deep summer P. rubescens blooms, located where water is taken for drinking water supply, and M. botrys, able to produce the most toxic MC variants with high cell quota, should be kept under control. The documentation and interpretation of sudden changes in toxins concentrations deserve special attention. This is particularly relevant in proximity of fish farming plants and water catchment sites.

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A numerical index for evaluating phytoplankton response to changes in nutrient levels in deep mediterranean reservoirs

Abstract: This paper proposes a new ecological index based on phytoplankton (MedPTI

Cited by 77 publications

References 35 publications

First record of planktonic crustaceans in Sardinian reservoirs

First record of planktonic crustaceans in Sardinian reservoirs

Phytoplankton and suitability of derived metrics for assessing the ecological status in a limno-reservoir, a Water Framework Directive nondefined type of Mediterranean waterbody

Cyanobacterial dynamics and toxins concentrations in Lake Alto Flumendosa, Sardinia, Italy

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