scholarly journals Functional diversity of phytoplankton highlights long-term gradual regime shift in the middle section of the Danube River due to global warming, human impacts and oligotrophication

2018 ◽  
Vol 63 (5) ◽  
pp. 456-472 ◽  
Author(s):  
András Abonyi ◽  
Éva Ács ◽  
András Hidas ◽  
István Grigorszky ◽  
Gábor Várbíró ◽  
...  
Keyword(s):  
Global Warming ◽  
Functional Diversity ◽  
Regime Shift ◽  
Human Impacts ◽  
Danube River ◽  
Middle Section ◽  
The Danube River

scholarly journals Is the Water Temperature of the Danube River at Bratislava, Slovakia, Rising?

2008 ◽  
Vol 9 (5) ◽  
pp. 1115-1122 ◽  
Author(s):  
Pavla Pekarova ◽  
Dana Halmova ◽  
Pavol Miklanek ◽  
Milan Onderka ◽  
Jan Pekar ◽  
...  
Keyword(s):  
Time Series ◽  
Water Temperature ◽  
Heat Load ◽  
Empirical Relationship ◽  
Danube River ◽  
Average Heat ◽  
The Danube River ◽  
Average Temperature ◽  
Monthly Discharge

Abstract This paper aims to reveal the annual regime, time series, and long-term water temperature trends of the Danube River at Bratislava, Slovakia, between the years 1926 and 2005. First, the main factors affecting the river’s water temperature were identified. Using multiple regression techniques, an empirical relationship is derived between monthly water temperatures and monthly atmospheric temperatures at Vienna (Hohe Warte), Austria, monthly discharge of the Danube, and some other factors as well. In the second part of the study, the long-term trends in the annual time series of water temperature were identified. The following series were evaluated: 1) The average annual water temperature (To) (determined as an arithmetic average of daily temperatures in the Danube at Bratislava), 2) the weighted annual average temperature values (Toυ) (determined from the daily temperatures weighted by the daily discharge rates at Bratislava), and 3) the average heat load (Zt) at the Bratislava station. In the long run, the To series is rising; however, the trend of the weighted long-term average temperature values, Toυ, is near zero. This result indicates that the average heat load of the Danube water did not change during the selected period of 80 yr. What did change is the interannual distribution of the average monthly discharge. Over the past 25 yr, an elevated runoff of “cold” water (increase of the December–April runoff) and a lower runoff of “warm” water (decrease of the river runoff during the summer months of June–August) were observed.

Human Impacts on Fish Fauna in the Danube River in Serbia: Current Status and Ecological Implications

2020 ◽  
pp. 257-279
Author(s):  
Mirjana Lenhardt ◽  
Marija Smederevac-Lalić ◽  
Aleksandar Hegediš ◽  
Stefan Skorić ◽  
Gorčin Cvijanović ◽  
...  
Keyword(s):  
Human Impacts ◽  
Fish Fauna ◽  
Danube River ◽  
Current Status ◽  
The Danube River ◽  
Ecological Implications

Changes in the Quality of the Danube River Water in the Section Smederevo-Kladovo in the Conditions of Backwater Effects

1990 ◽  
Vol 22 (5) ◽  
pp. 181-188 ◽  
Author(s):  
M. Peršić ◽  
M. Miloradov ◽  
V. Tutundžić ◽  
Z. Čukić
Keyword(s):  
River Water ◽  
Danube River ◽  
Hydropower Plant ◽  
Biochemical Processes ◽  
The Danube River ◽  
Global View ◽  
Physico Chemical ◽  
Composition And Structure

The paper describes specific changes in the quality of the Danube river water under the conditions of backwater effects in the Hydropower Plant Djerdap I storage. The results of longterm tests in five profiles of the investigated section, at various discharges give a global view of the intensity of changes in the composition of water mass. The analysis included changes in the contents of: organic matter, oxygen regime, reduction of turbidity and changes in the composition and abundance of plankton. The specific changes in the domain of physico-chemical and biochemical processes and changes in the biological status of the watercourse (composition and structure of plankton) at varying retention times complete the picture of short-term changes in the investigated system. Presentation of some settling effects and processes in the sediment of the storage provides an idea of some long-term changes in the conditions of backwater effects of the Danube in the investigated section.

Long-term monitoring of the Danube river—Sampling techniques, radionuclide metrology and radioecological assessment

2009 ◽  
Vol 67 (5) ◽  
pp. 894-900 ◽  
Author(s):  
F.J. Maringer ◽  
V. Gruber ◽  
M. Hrachowitz ◽  
A. Baumgartner ◽  
S. Weilner ◽  
...  
Keyword(s):  
Danube River ◽  
Sampling Techniques ◽  
The Danube River ◽  
Long Term Monitoring ◽  
Radionuclide Metrology ◽  
Term Monitoring

Changes of the nutrient loads of the Danube since the late eighties: an analysis based on long term changes along the whole Danube River and its main tributaries

2005 ◽  
Vol 51 (11) ◽  
pp. 205-212 ◽  
Author(s):  
J. van Gils ◽  
H. Behrendt ◽  
A. Constantinescu ◽  
F. Laszlo ◽  
L. Popescu
Keyword(s):  
Human Impacts ◽  
Inorganic Nitrogen ◽  
Danube River ◽  
The Black Sea ◽  
Nutrient Loads ◽  
Economic Changes ◽  
Long Term Changes ◽  
Eastern European Countries ◽  
River Loads

The Danube nutrient loads are affected by human impacts mainly from agriculture and wastewater discharges. Knowledge about the Danube nutrient loads and the changes of these loads over time is essential for understanding the changes within the ecosystem of the Black Sea, induced by these loads. The paper shows the long term changes of the nutrient load along the Danube estimated by measurements from different countries and institutions. The results show large differences between Dissolved Inorganic Nitrogen (DIN) and Total Phosphorus (TP). For TP, the Danube River loads show a strong decrease since 1988–1992, especially in the Middle and Lower basin. This change is probably partly connected to the dramatic economic changes in the Middle and Eastern European countries following the collapse of the communist system. The DIN load does not show a decreasing trend in the last decade. The data indicate that there may be a decreasing trend in the anthropogenic emissions, but that such a trend is counteracted by a significantly increasing trend of the Danube discharge in the last decade. The accuracy of the available data is analysed in the paper as well.

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