Phytoplankton biomass and functional composition in the Danube River and selected tributaries: a case study Joint Danube Survey 4

Stanković, Igor; Hanžek, Nikola; Mischke, Ute; Krisa, Harald; Velická, Zuzana; T-Krasznai, Enikő; Kiss, Keve Tihamér; Belkinova, Detelina; Bălan, Marinela; Amăriucăi, Vlad; Diaconu, Ionela; Borics, Gábor

doi:10.1007/s10750-023-05359-4

Cited by 2 publications

(2 citation statements)

References 41 publications

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“…The other two models were also relatively good for prediction, having the following values: a prediction rate of 74.80% and 0.64 Kappa Index for NO 3 , and, respectively, 71.55% and 0.17 for PO 4 . Stankovic et al, in 2023, used macrophyte presence-absence data obtained from the Joint Danube Survey (JDS3) to predict the water quality of the Danube River, pointing out the differences caused by the Iron Gates dam [54]. For each water quality variable (dissolved oxygen, nitrate-nitrogen, and orthophosphates), a multi-layer feed-forward artificial neural network model (ANN) was constructed.…”

Section: Resultsmentioning

confidence: 99%

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Overview of the Eutrophication in Romanian Lakes and Reservoirs

Dumitran,

Vuta,

Popa

2024

Limnological Review

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In this paper, attention is drawn to the deterioration of Romanian surface water ecosystems due to eutrophication, an important environmental issue both at national and international levels. An inventory of existing studies dealing with the issue of the eutrophication of lakes and reservoirs in Romania is made, aiming to identify the main problems Romania is facing in monitoring, classifying, and managing eutrophic ecosystems. On Web of Science, the keyword “Eutrophication”, with “Romania” as country/region, leads to 50 publications, which are analyzed in this review. The number of articles found does not reflect the real environmental issue represented by eutrophic lakes and reservoirs in Romania. At a national level, only 126 lakes and reservoirs have been monitored and assessed between 2018 and 2020, in terms of ecological status/ecological potential. Thus, at a global evaluation, 77% of natural lakes and 33% of artificial ones do not reach the quality objectives. The results of this study showed that the frequency of measurements taken by water quality indicators is not the strongest point of measurement campaigns, as it is not sufficient for the diagnosis of eutrophic lakes, and supplementary measures must be undertaken to better understand and mitigate this phenomenon.

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Section: Resultsmentioning

confidence: 99%

“…At present, the structure of the zoobenthos, as well as of the phytoplankton and zooplankton, is characteristic of the limnic-rheophilic ecosystems. n y n [54] Danube Delta 1…”

Section: Measurements ** Namementioning

confidence: 99%

Overview of the Eutrophication in Romanian Lakes and Reservoirs

Dumitran,

Vuta,

Popa

2024

Limnological Review

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Phytoplankton in Deep Lakes of the Dinaric Karst: Functional Biodiversity and Main Ecological Features

Hanžek,

Šiljeg,

Šikić

et al. 2024

Plants

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Phytoplankton is a polyphyletic group of organisms that responds rapidly to environmental conditions and provides a reliable response to changes, making it a good ecological indicator for water quality monitoring. However, a gradient is almost essential for a reliable relationship between pressure and impact. In a low-gradient environment, ingenuity is required to outsmart the limitations of the commonly used linear relationship. Here, we examine changes in biomass and functional biodiversity by analysing larger data sets (2013–2022) in six ecologically diverse, natural, deep Croatian karst lakes with low nutrient gradients using nonlinear correlation coefficients and multivariate analyses in 209 samples. We found that phytoplankton biomass was most strongly influenced by nutrients, salinity and alkalinity, while light availability and total nitrogen strongly influenced phytoplankton functional biodiversity. An additional analysis of the TN:TP ratio revealed that the oligotrophic Lake Vransko is nitrogen-limited, and lakes Kozjak and Prošće are phosphorus-limited. This further clarified the relationship of phytoplankton to nutrients despite the low gradient. The complex analysis in this study provides a new perspective for predicting changes in the structure and succession of phytoplankton in deep karst lakes for successful management under apparent anthropogenic pressure and climate change.

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Phytoplankton biomass and functional composition in the Danube River and selected tributaries: a case study Joint Danube Survey 4

Cited by 2 publications

References 41 publications

Overview of the Eutrophication in Romanian Lakes and Reservoirs

Overview of the Eutrophication in Romanian Lakes and Reservoirs

Phytoplankton in Deep Lakes of the Dinaric Karst: Functional Biodiversity and Main Ecological Features

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