Phytoplankton and submerged macrophytes in the aquatic ecosystems of the Danube Delta during the last decade

Vădineanu, Angheluţă; Cristofor, Sergiu; Ignat, Gheorghe

doi:10.1007/978-94-011-2745-5_14

Cited by 10 publications

(7 citation statements)

References 2 publications

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“…With rapidly increasing amounts of fertilizers used in the agricultural landscape and manifold hydro-engineering measures completed, the biota of running waters have been exposed to an ever-increasing pressure in the last century with consequences for macrophyte diversity and community composition (Phillips et al, 1978;Robach et al, 1996;Smith et al, 1999;Egertson et al, 2004;Hilton et al, 2006;Kozlowski & Vallelian, 2009). Eutrophication of water bodies by oxidised and reduced nitrogen compounds, but also by phosphorus, is known to cause profound shifts in the plant community composition of running waters, where rooted macrophytes may eventually be replaced by green macroalgae or phytoplankton as a consequence of light deficiency (Sand-Jensen & Borum, 1991;Vadineanu et al, 1992;Marques et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Diversity loss in the macrophyte vegetation of northwest German streams and rivers between the 1950s and 2010

Steffen

Becker

Herr³

et al. 2013

Hydrobiologia

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This resampling study in 338 semi-permanent plots analyses changes in river macrophyte diversity in 70 water courses (small streams to medium-sized rivers) from four regions of the northwest German lowlands during the last six decades. The total macrophyte species pool decreased between the 1950s and 2010/2011 by 28% (from 51 to 37 species), mean plot-level species richness by 19% (from 4.7 to 3.8 species per relevé) and the number of red-listed species by 40% (from 30 to 18 species). Species loss was associated with marked change in species traits: species with presumably higher mechanical stress tolerance (indicated by low specific leaf area and short leaf longevity) are more abundant today. Nearly, half of the species present in the 1950s had either disappeared or been replaced by other species in the recent relevés. The dramatic impoverishment is likely a consequence of continued nutrient input that drove oligo-and mesotraphent species to extinction, and of restructuring and maintenance works in the water courses that reduced stagnant and undisturbed river habitats, where stress-intolerant species can persist. Efficient measures to reduce the nutrient load and to re-naturalise stream and river beds are urgently needed to halt and reverse the loss of macrophyte diversity.

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Section: Introductionmentioning

confidence: 99%

Diversity loss in the macrophyte vegetation of northwest German streams and rivers between the 1950s and 2010

Steffen

Becker

Herr³

et al. 2013

Hydrobiologia

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“…Aquatic vascular macrophytes are adapted to living under certain aquatic conditions and their occurrence and distribution depend on an array of factors. These factors include water depth, transparency, regime, chemical composition, pH and salinity [2][3][4][5][6][7][8][9][10][11]. Sediment composition and properties are also important for the presence of certain macrophytic species in aquatic ecosystems [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Primary production dynamics of dominant hydrophytes in Lake Provala (Serbia)

2009

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Abstract:The objective of this investigation was to analyze the primary production of the dominant hydrophytes by monitoring levels of organic matter and organic carbon and estimating photosynthetic potential via the total chlorophyll content. The survey was conducted in Lake Provala (Serbia) throughout the peak vegetation period of the year 2000. . Chlorophyll A (Chl a) and chlorophyll A+B (Chl a+b) pigments ranged from 1.54 mg g (Chl a+b) in C. demersum. At full leaf out, the latter aquatic plants exceeded 50% cover of the open water surface. All species achieved maximum growth in June, but significant differences in growth dynamics were observed. At the end of the vegetation period, these plants sink to the bottom and decompose

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“…Therefore, Matita, Dracului, and Trei Iezere lakes were included in this study. In the case of Matita Lake, previous investigations were undertaken (Cristofor et al, 2003;V˘adineanu et al, 1992); however, Dracului and Trei Iezere lakes were recently included in this program. These two lakes belong to the Matita-Merhei hydrological sub-unit of the Danube Delta, having indirect connection with the main river channel.…”

Section: Methodsmentioning

confidence: 99%

Seasonal Variation of Eutrophication in Some Lakes of Danube Delta Biosphere Reserve

Liliana

Tőrök

Cârstea

et al. 2017

Water Environment Research

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To understand the trophic state of lakes, this study aims to determine the dynamics of phytoplankton assemblages and the main factors that influence their seasonal variation. Sampling campaigns were carried out in three lakes from the Danube Delta Biosphere Reserve. Spectral analysis of specific phytoplankton pigments was applied as a diagnostic marker to establish the distribution and composition of phytoplankton taxonomic groups. Fluorescence spectroscopy was used to quantify changes in dissolved organic matter (DOM). The relative contribution of the main phytoplankton groups to the total phytoplankton biomass and the trend of development during succession of the seasons showed that cyanobacteria could raise potential ecological or human health problems. Moreover, fluorescence spectroscopy revealed that Cryptophyta and cyanobacteria were the main contributors to the protein-like components of DOM. It was concluded that fluorescence could be used to provide a qualitative evaluation of the eutrophication degree in Danube Delta lakes.

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Phytoplankton and submerged macrophytes in the aquatic ecosystems of the Danube Delta during the last decade

Cited by 10 publications

References 2 publications

Diversity loss in the macrophyte vegetation of northwest German streams and rivers between the 1950s and 2010

Diversity loss in the macrophyte vegetation of northwest German streams and rivers between the 1950s and 2010

Primary production dynamics of dominant hydrophytes in Lake Provala (Serbia)

Seasonal Variation of Eutrophication in Some Lakes of Danube Delta Biosphere Reserve

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