Spatiotemporal changes and drivers of trophic status over three decades in the largest shallow lake in Central Europe, Lake Balaton

Hatvani, István Gábor; Barros, Vinicius Deganutti de; Tanos, Péter; Kovács, József; Kovács, Ilona Székely; Clement, Adrienne

doi:10.1016/j.ecoleng.2020.105861

Cited by 25 publications

(24 citation statements)

References 56 publications

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“…Taxonomic identification of cyanobacteria was conducted similarly to Tokodi et al [ 16 ] and according to different taxonomic keys [ 18 , 19 , 20 ]. Identification was conducted under a Motic BA310 (Wetzlar, Germany) light microscope using a Bresser (9MP) digital camera and Micro Cam Lab software (Bonneuil, France).…”

Section: Methodsmentioning

confidence: 99%

“…Cyanotoxin Analyses 2.6.1. Preparation of Water Samples for Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) Preparation of water samples for LC-MS/MS was similar to the procedure described in Tokodi et al [16]. In short, toxin concentration was determined by first filtering 100-250 mL of water samples depending on the bloom intensity through 2-3 µm filters.…”

Section: Determination Of Cyanotoxin-coding Genesmentioning

confidence: 99%

“…Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) The theoretical and practical framework of LC-MS/MS experiments and examples of mass spectra in the context of cyanobacterial toxins have been recently presented by Caixach et al[31]. The LC-MS/MS experiments of this paper were carried out on an Agilent 1200 Rapid Resolution (RR) LC coupled to a Bruker Daltonics HCT Ultra iontrap mass spectrometer (Bremen, Germany) with an electrospray ion (ESI) source as reported earlier[16,27,32]. The 1200 RR LC system consisted of a binary pump, a vacuum degasser, an SL autosampler and a thermostatted column compartment.The separation of the MC samples was achieved on an Ascentis C18, 50 mm × 3 mm I.D.…”

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confidence: 99%

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Does the Kis-Balaton Water Protection System (KBWPS) Effectively Safeguard Lake Balaton from Toxic Cyanobacterial Blooms?

et al. 2021

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Lake Balaton is the largest shallow lake in Central Europe. Its water quality is affected by its biggest inflow, the Zala River. During late 20th century, a wetland area named the Kis-Balaton Water Protection System (KBWPS) was constructed in the hopes that it would act as a filter zone and thus ameliorate the water quality of Lake Balaton. The aim of the present study was to test whether the KBWPS effectively safeguards Lake Balaton against toxic cyanobacterial blooms. During April, May, July and September 2018, severe cyanobacterial blooming was observed in the KBWPS with numbers reaching up to 13 million cells/mL at the peak of the bloom (July 2018). MC- and STX-coding genes were detected in the cyanobacterial biomass. Five out of nine tested microcystin congeners were detected at the peak of the bloom with the concentrations of MC-LR reaching 1.29 µg/L; however, accumulation of MCs was not detected in fish tissues. Histopathological analyses displayed severe hepatopancreas, kidney and gill alterations in fish obtained throughout the investigated period. In Lake Balaton, on the other hand, cyanobacterial numbers were much lower; more than 400-fold fewer cells/mL were detected during June 2018 and cyanotoxins were not detected in the water. Hepatic, kidney and gill tissue displayed few alterations and resembled the structure of control fish. We can conclude that the KBWPS acts as a significant buffering zone, thus protecting the water quality of Lake Balaton. However, as MC- and STX-coding genes in the cyanobacterial biomass were detected at both sites, regular monitoring of this valuable ecosystem for the presence of cyanobacteria and cyanotoxins is of paramount importance.

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Section: Methodsmentioning

confidence: 99%

Section: Determination Of Cyanotoxin-coding Genesmentioning

confidence: 99%

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confidence: 99%

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Does the Kis-Balaton Water Protection System (KBWPS) Effectively Safeguard Lake Balaton from Toxic Cyanobacterial Blooms?

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“…A sequential univariate outlier detection procedure (Ben-Gal, 2005) was applied to the data to find possible outlying values that deviate to a high extent from the other observations (Barnett and Lewis, 1974;Hawkins, 1980). During the procedure, the time series of the stations were compared pairwise for each year.…”

Section: Data Preprocessingmentioning

confidence: 99%

Isoscape of amount-weighted annual mean precipitation tritium (<sup>3</sup>H) activity from 1976 to 2017 for the Adriatic–Pannonian region – AP<sup>3</sup>H_v1 database

Kern

Erdélyi²,

Vreča

et al. 2020

Earth Syst. Sci. Data

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Abstract. Tritium (3H) as a constituent of the water molecule is an important natural tracer in hydrological sciences. The anthropogenic tritium introduced into the atmosphere unintentionally became an excellent tracer of processes on a time scale of up to 100 years. A prerequisite for tritium applications is to know the distribution of tritium activity in precipitation. Here we present a database of isoscapes derived from 41 stations for amount-weighted annual mean tritium activity in precipitation for the period 1976 to 2017 on spatially continuous interpolated 1 km×1 km grids for the Adriatic–Pannonian region (called the AP3H_v1 database), with a special focus on post-2010 years, which are not represented by existing global models. Five stations were used for out-of-sample evaluation of the model performance, independently confirming its capability of reproducing the spatiotemporal tritium variability in the region. The AP3H database is capable of providing reliable spatiotemporal input for hydrogeological application at any place within Slovenia, Hungary, and their surroundings. Results also show a decrease in the average spatial representativity of the stations regarding tritium activity in precipitation from ∼440 km in 1970s, when bomb tritium still prevailed in precipitation, to ∼235 km in the 2010s. The post-2010 isoscapes can serve as benchmarks for background tritium activity for the region, helping to determine potential future local increases in technogenic tritium from these backgrounds. The gridded tritium isoscape is available in NetCDF-4 at https://doi.org/10.1594/PANGAEA.896938 (Kern et al., 2019).

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“…Water quality indicators are usually more closely monitored in the period between spring and autumn (Hatvani et al, 2020) as T w is high at this time of the year in case of non-thermal waters. However, the water of Lake Hévíz and its effluent are also of higher temperature in the winter period, so the water quality should be varied in the non-thermal water during this time of the year.…”

Section: Introductionmentioning

confidence: 99%

Some preliminary investigations of water quality parameters in a Hungarian thermal lake, Hévíz

Simon¹,

Simón²,

Soós³

et al. 2020

JCEA

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Spatiotemporal changes and drivers of trophic status over three decades in the largest shallow lake in Central Europe, Lake Balaton

Cited by 25 publications

References 56 publications

Does the Kis-Balaton Water Protection System (KBWPS) Effectively Safeguard Lake Balaton from Toxic Cyanobacterial Blooms?

Does the Kis-Balaton Water Protection System (KBWPS) Effectively Safeguard Lake Balaton from Toxic Cyanobacterial Blooms?

Isoscape of amount-weighted annual mean precipitation tritium (<sup>3</sup>H) activity from 1976 to 2017 for the Adriatic–Pannonian region – AP<sup>3</sup>H_v1 database

Some preliminary investigations of water quality parameters in a Hungarian thermal lake, Hévíz

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Spatiotemporal changes and drivers of trophic status over three decades in the largest shallow lake in Central Europe, Lake Balaton

Cited by 25 publications

References 56 publications

Does the Kis-Balaton Water Protection System (KBWPS) Effectively Safeguard Lake Balaton from Toxic Cyanobacterial Blooms?

Does the Kis-Balaton Water Protection System (KBWPS) Effectively Safeguard Lake Balaton from Toxic Cyanobacterial Blooms?

Isoscape of amount-weighted annual mean precipitation tritium (&lt;sup&gt;3&lt;/sup&gt;H) activity from 1976 to 2017 for the Adriatic–Pannonian region – AP&lt;sup&gt;3&lt;/sup&gt;H_v1 database

Some preliminary investigations of water quality parameters in a Hungarian thermal lake, Hévíz

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Isoscape of amount-weighted annual mean precipitation tritium (<sup>3</sup>H) activity from 1976 to 2017 for the Adriatic–Pannonian region – AP<sup>3</sup>H_v1 database