Chlorophyll-a concentrations along the River Elbe

Desortová, Blanka; Prange, Andreas; Punčochář, Pavel

doi:10.1127/lr/10/1996/203

Cited by 4 publications

(4 citation statements)

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“…Maximum values of Chl a in the two stations (\7 lg l -1 ) were around one order of magnitude lower than maxima recorded in other European rivers, e.g., Danube, Thames, Elbe and Meuse (150-285 lg l -1 ; Bothár & Kiss, 1990;Ruse & Hutchings, 1996;Desortová et al, 1996;Gosselain et al, 1998;Young et al, 1999). This aspect was underscored in previous research, when in three stations along a 26-km stretch of the lowland course of the River Adige, Salmaso and Braioni (2008) recorded maximum concentrations of Chl a ranging from 23 to 31 lg l -1 .…”

Section: Constraints To Phytoplankton Developmentmentioning

confidence: 67%

At the extreme of physical gradients: phytoplankton in highly flushed, large rivers

Salmaso

Zignin

2009

Hydrobiologia

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Phytoplankton and associated environmental factors were collected fortnightly during a 1-year cycle in the upper and lower reaches of the River Adige (northeastern Italy). The river has a typical Alpine flow, with the period of high flow and flooding occurring in the spring and summer months. Phytoplankton biomass was constrained by physical variables, mainly water discharge and associated variables directly linked to water fluxes. These factors acted negatively and synchronously by diluting phytoplankton cells and worsening the light regime. Nutrient concentrations did not appear to limit phytoplankton growth. Compared to many other central European rivers, the very low maximum algal biomasses supported by River Adige (Chl a \ 7 lg l -1 ) are due to the Alpine flow regime, which is characterised by higher flow during the warmer months, when conditions for algal development are more favourable. Hydrology and flow regime, along with the channelisation of the river, caused development of a simplified phytoplankton community, which was almost exclusively composed of diatoms. Moreover, these factors contributed significantly to the lack of ordered and cyclic temporal patterns in phytoplankton dynamics. In fact, the gradient of species composition showed a strong association with hydrological factors. If the scenarios predicting increase of atmospheric temperatures and decrease of atmospheric precipitations and water availability in the regions south of the Alps are realistic, algal biomasses may rise and be associated with an increase of groups other than diatoms.

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Section: Constraints To Phytoplankton Developmentmentioning

confidence: 67%

At the extreme of physical gradients: phytoplankton in highly flushed, large rivers

Salmaso

Zignin

2009

Hydrobiologia

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“…During a two-day survey of the river Elbe by helicopter (Desortova et al [24]), the maximum chlorophyll-a concentrations were found at km 280 and km 560. However, these "snapshots" do not consider the hydrological/meteorological history of the sampled water body.…”

Section: Discussion Of the Resultsmentioning

confidence: 98%

The Effects of Nutrient Concentrations in the River Elbe

Guhr

Spott

Bormki

et al. 2003

Acta hydrochim. hydrobiol.

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The nutrient turnover and the resulting development of phytoplankton biomass were investigated during four river surveys in the free-flowing reach of the river Elbe under almost constant hydrological and meteorological conditions taking into account the transport time and the time of day.The chlorophyll-a concentration was found to increase by a factor of between 3 and 6 depending on the season, while the biomass load increased by a factor of up to 18. The concentrations of dissolved silicate and dissolved total phosphate behaved oppositely to this development, while the levels of particulate bound nutrients rose accordingly. Depending on the season, 6...23 % of the total bound nitrogen was found to be removed from the river by denitrification. The river Saale contains the highest load of nutrients of all the tributaries. At the end of the investigated reach, algae biomass accounts for as much as 75 % of the POC. Nährstoffumsatz in der ElbeMit 4 transport-und tageszeitkonformen Längsschnittbereisungen der frei fließenden Elbe bei jeweils annähernd gleichbleibenden hydrologisch-meteorologischen Bedingungen konnte der Nährstoffumsatz und die sich daraus entwickelnde Phytoplanktonbiomasse verfolgt werden. Die Chlorophyllkonzentration nimmt auf der Fließstrecke von der Grenze zu Tschechien bis nahe Geesthacht je nach Jahreszeit um das Drei-bis Sechsfache zu, die Fracht um bis zum 18fachen. Insbesondere die Konzentrationen an gelöstem Silicat und gelöstem Gesamtphosphat verhalten sich zu dieser Entwicklung gegenläufig, während die partikulär gebundenen Nährstoffgehalte entsprechend ansteigen. Je nach Jahreszeit werden durch Denitrifikation 6...23 % des gebundenen Gesamtstickstoffs aus dem Gewässer entfernt. Von den Nebenflüssen weist die Saale die höchste Nährstoffbelastung auf. Am Ende der Untersuchungsstrecke hat die Algenbiomasse einen Anteil von bis zu 75 % am POC.

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“…In the Tigris River, chlorophyll‐ a concentrations were found to be lower compared to Chl‐ a values of other large European rivers, such as the Trent, Thames, Elbe, Rhine, Ebro, Meuse, and Po (Admiraal et al, ; Desortova, Prange, & Puncochar, ; Gosselain, Hamilton, & Descy, ; Ruse & Hutchings, ; Skidmore, Maberly, & Whitton, ; Tavernini et al, ; Tornes et al, ). The Euphrates River in Iraq had a mean Chl‐ a concentration of 9.3 μg/L, which was similar to the Tigris River with a mean Chl‐ a concentration of 7.75 μg/L (Al‐Saadi et al, ).…”

Section: Discussionmentioning

confidence: 98%

Abiotic factors controlling the seasonal and spatial patterns of phytoplankton community in the Tigris River, Turkey

Varol

Şen

2017

River Research & Apps

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In this study, the seasonal and spatial dynamics of the phytoplankton community in the Tigris River (Turkey) and the relationships with environmental factors were analysed. Bacillariophyta were the most important taxonomic group both in terms of abundance and species number.Phytoplankton abundance increased from winter to autumn associated with a decline in discharge and an increase in nutrient concentrations and water temperature. There was a downstream increase in phytoplankton abundance and species number in the river. Similar spatial and seasonal patterns were observed in chlorophyll-a concentration and phytoplankton abundance. Redundancy analysis and correlation analysis revealed that chemical variables, mainly nutrients were the most important abiotic factors controlling phytoplankton abundance in the Tigris River.

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Chlorophyll-a concentrations along the River Elbe

Cited by 4 publications

References 0 publications

At the extreme of physical gradients: phytoplankton in highly flushed, large rivers

At the extreme of physical gradients: phytoplankton in highly flushed, large rivers

The Effects of Nutrient Concentrations in the River Elbe

Abiotic factors controlling the seasonal and spatial patterns of phytoplankton community in the Tigris River, Turkey

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