Constructed inshore zones as river corridors through urban areas?The Danube in Vienna: preliminary results

Chovanec, Andreas; Schiemer, F.; Cabela, A.; Gressler, S.; Grötzer, C.; Pascher, Kati; Raab, Rainer; Teufl, H.; Wimmer, Romana

doi:10.1002/(sici)1099-1646(200003/04)16:2<175::aid-rrr578>3.0.co;2-c

Cited by 23 publications

(13 citation statements)

References 18 publications

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“…The flow regime has an alpine character with variable and stochastic patterns (regulated low discharge: 915 m 3 s −1 , mean discharge: 1930 m 3 s −1 , annual flood discharge: 5300 m 3 s −1 , 30 year flood discharge: 9340 m 3 s −1 ). Following the major regulation scheme in 1875, the Danube River was confined between flood protection dams, thus the main channel was disconnected from the adjacent floodplains (Chovanec et al, 2000). Restoration projects began in 1997 with the goal of reconnecting several floodplains to the main channel of the Danube (Hein et al, 2004; Schiemer et al, 1999).…”

Section: Methodsmentioning

confidence: 99%

Large-scale controls on potential respiration and denitrification in riverine floodplains

Welti

Bondar‐Kunze

Singer

et al. 2012

Ecological Engineering

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Restoration measures of deteriorated river ecosystems generally aim at increasing the spatial heterogeneity and connectivity of these systems in order to increase biodiversity and ecosystem stability. While this is believed to benefit overall ecological integrity, consequences of such restoration projects on biogeochemical processes per se (i.e. ecosystem functioning) in fluvial systems are rarely considered. We address these issues by evaluating the characteristics of surface water connection between side arms and the main river channel in a former braided river section and the role and degree of connectivity (i.e. duration of surface water connection) on the sediment biogeochemistry. We hypothesized that potential respiration and denitrification would be controlled by the degree of hydrological connectivity, which was increased after floodplain restoration. We measured potential microbial respiration (SIR) and denitrification (DEA) and compared a degraded floodplain section of the Danube River with a reconnected and restored floodplain in the same river section. Re-establishing surface water connection altered the controls on sediment microbial respiration and denitrification ultimately impacting potential microbial activities. Meta-variables were created to characterize the effects of hydrology, morphology, and the available carbon and nutrient pools on potential microbial processing. Mantel statistics and path analysis were performed and demonstrate a hierarchy where the effects of hydrology on the available substrates and microbial processing are mediated by the morphology of the floodplain. In addition, these processes are highest in the least connected sites. Surface water connection, mediated by morphology regulates the potential denitrification rate and the ratio of N2O to N2 emissions, demonstrating the effects of restoration in floodplain systems.

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Section: Methodsmentioning

confidence: 99%

Large-scale controls on potential respiration and denitrification in riverine floodplains

Welti

Bondar‐Kunze

Singer

et al. 2012

Ecological Engineering

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“…Rivers and streams are complex and dynamic systems supporting high landscape biodiversity (Chovanec et al, 2000). Despite this fact they are among the environments most disturbed and threatened by humans (Nilsson & Jansson, 1995;Nilsson & Svedmark, 2002).…”

Section: Introductionmentioning

confidence: 99%

Distribution of macrophytes and condition of the physical environment of streams flowing through agricultural landscape in north-eastern Slovenia

et al. 2007

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The distribution and abundance of macrophytes, land-use beyond the riparian zone, characteristics of the riparian zone and selected channel properties have been studied in 9 streams flowing through an agricultural landscape in the north-eastern part of Slovenia. The streams studied supported a rich macrophyte community. Altogether, 53 plant taxa were observed on 93 km of the streams. Canonical correspondence analysis indicated that 10 out of the 11 parameters examined significantly influenced macrophyte distribution. Of these, substrate characteristics and riparian vegetation type were the most influential. Species composition analysis revealed that the majority of species indicated moderate nutrient load while, in the more strongly modified reaches, species indicating eutrophic conditions, i.e. Myriophyllum spicatum and different species of genus Potamogeton, were more abundant.

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“…Rivers are diverse and dynamic systems that play an important role in the complexity of the landscape (Chovanec et al 2000). Aquatic macrophytes are fundamental to the structure and functioning of lowland river habitats (Baatrup-Pedersen & Riis 1999), and description of environmental parameters influencing their patterns of composition and distribution are of crucial importance.…”

Section: Introductionmentioning

confidence: 99%

Ecological characteristics of plant species and associations along two Dinaric karstic rivers (Bosnia and Herzegovina, the Balkans)

et al. 2013

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This paper describes the plant communities of two oligotrophic karstic rivers with a slight anthropogenic influence -the Trebižat and the Lištica -in South Bosnia and Herzegovina, their sinecology, and the relationship between vegetation and plant species and environmental parameters. According to 87 relevés, a total of 26 plant associations, using Braun-Blanquet methods, were found in the rivers and nearby surveyed area. Only nine associations were common to both rivers. Eight associations were recorded for the territory of Bosnia and Herzegovina for the first time. Associations from both rivers differed according to following parameters measured at the sampling site: water temperature, distance from the mouth (river kilometers), river width, water depth, flow, pH and slope. There were no differences in nutrient concentrations among the associations. According to Canonical Correspondence Analysis (CCA), three environmental variables out of the 11 initially considered were retained as being related to plant distribution. The first two axes explained 56.8% and 35.2% of variance of species-environment relationship in the Trebižat and Lištica rivers, respectively. Water depth in the Trebižat River, and pH and river kilometers in the Lištica River were found to be the most influential, while nutrients and other physico-chemical parameters were not significant in either river. Water depth vector was identified as an underlying environmental factor determining distribution of Potamogeton lucens and Myriophyllum verticillatum (Potamion), and Nymphaea alba (Nymphaeion albae). According to in situ measurements of light intensity, the highest coefficients of light attenuation, radiance and reflection were found at a station with dense populations of Potamogeton lucens and Nuphar luteum (Potametum lucentis). The vegetation and floristic value of the rivers is discussed as a basis for biodiversity conservation programmes and evaluating the state of these ecosystems in the future.

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Constructed inshore zones as river corridors through urban areas?The Danube in Vienna: preliminary results

Cited by 23 publications

References 18 publications

Large-scale controls on potential respiration and denitrification in riverine floodplains

Large-scale controls on potential respiration and denitrification in riverine floodplains

Distribution of macrophytes and condition of the physical environment of streams flowing through agricultural landscape in north-eastern Slovenia

Ecological characteristics of plant species and associations along two Dinaric karstic rivers (Bosnia and Herzegovina, the Balkans)

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