Spatial and temporal diversity of small shallow waters in river Lužnice floodplain

Pithart, David; Pichlová, Radka; Bílý, Michal; Hrbáček, Jaroslav; Novotná, Kateřina; Pechar, Libor

doi:10.1007/s10750-007-0607-8

Cited by 28 publications

(17 citation statements)

References 20 publications

(21 reference statements)

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“…Similar effects in small ponds were observed, e.g. by Declerck et al (2007) and Pithart et al (2007). In contrast, effects of macrophyte photosynthesis on water quality could not be detected.…”

Section: Second Component: Agricultural Solutes Inputsupporting

confidence: 71%

Grasping the heterogeneity of kettle hole water quality in Northeast Germany

Lischeid

Kalettka

2011

Hydrobiologia

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In the young moraine landscape in Northeast Germany, small glacially created ponds, the so-called kettle holes, are very abundant. They exhibit large spatial heterogeneity, seemingly rendering each kettle hole unique. However, this would not be consistent with any scientific approach. Thus, a classification scheme has been developed for kettle holes in Northeast Germany based on morphology, hydrodynamics and connection to stream networks of the kettle holes as well as size, topography and land use of the respective catchment. These indices are assumed to be related both to water quality as well as to biological issues of the kettle holes. Starting in the mid-1990s, an extensive monitoring program has been established in the federal state of Brandenburg, Germany. In this study, a subset comprising 1,316 samples from 79 kettle holes was analysed, where 21 parameters had been determined. Sampling intervals varied widely, and were between bi-weekly and three-monthly at most sites. A nonlinear principal component analysis was performed. The first four components explained 90% of the variance. These components seem to provide quantitative measures of phosphorus release from the sediments during hypoxic periods, agricultural solute input, algae primary production, and geogenic compounds. This allowed differentiating between the natural and anthropogenic impact factors on water quality. In addition, scores of single components were related to properties of the kettle holes and their environments. The results contribute to a better understanding of biological and biogeochemical processes and can be used to verify the effects of conservation and management strategies for kettle holes.

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Section: Second Component: Agricultural Solutes Inputsupporting

confidence: 71%

Grasping the heterogeneity of kettle hole water quality in Northeast Germany

Lischeid

Kalettka

2011

Hydrobiologia

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“…However, after the floods, the washing out effect of nutrients from the floodplain area resulted with an increase in nutrient concentrations due to the natural input and accumulation of organic matter from terrestrial vegetation. Thus, the floodplain served as a ''zone of storage and turnover of organic matter'' (Pithart et al 2007). …”

Section: Discussionmentioning

confidence: 99%

The influence of extreme floods from the River Danube in 2006 on phytoplankton communities in a floodplain lake: Shift to a clear state

Mihaljević

Špoljarić

Stević

et al. 2010

Limnologica - Ecology and Management of Inland Waters

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a b s t r a c tThe influence of extreme floods from the River Danube in 2006 on the species composition and vertical distributions of phytoplankton was studied in a shallow floodplain lake, Lake Sakadaš (Kopački Rit Nature Park, Croatia) which in the last few decades was in a turbid state characterised by high phytoplankton concentrations. As a consequence of extremely high floods, the whole floodplain area (approximately 16 km 2 ) became one lentic habitat with well developed macrophyte vegetation. Seasonal dynamics of chlorophyll a (Chl a) concentration in the lake had a characteristic pattern for the shallow lakes with dense macrophyte vegetation. Extremely low mean phytoplankton abundance and biomass were found in the conditions of very high nutrient concentrations. Dominant phytoplankton species were diatoms and chlorococcal green algae from the functional groups characteristic for a mixed environment. The canonical correspondence analysis (CCA) demonstrated that nutrients and temperature were significant environmental variables for their development. The sequence of phytoplankton seasonality, vertical distribution of phytoplankton, as well as the domination of rapidly acclimating phytoplankton forms (R-strategists) indicated clear, well-mixed conditions and a highly disturbed environment. Our results suggest that the occurrence of extreme flooding can be a stressor high enough for the transition from a turbid to a clear state of the floodplain lake. Possibly, cyclic shifts between alternative stable states in floodplain ecosystems can be expected as a consequence of the impact of extreme hydrological events induced by a climate change.

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“…The high levels of nutrients (especially TP) established during the limnophase indicated that the river water did not serve as a major source of nutrients as is characteristic for tropical floodplains (Nabout et al, 2006;Weilhoefer and Pan, 2007). Thus, the nutrient enrichment during potamophase can be considered as the result of the in-lake processes due to the natural input and accumulation of organic matter from terrestrial vegetation in the river-floodplain system, generally recognized as ''zones of storage and turnover of organic matter'' (Keckeis et al, 2003;Pithart et al, 2007). The appearance of dissolved oxygen demand during the usually flooded year confirmed strong organic matter degradation and interface nitrogen transformation (McCarthy et al, 2008) consequently expressed as high NO 2 concentrations.…”

Section: Discussionmentioning

confidence: 99%

Dual impact of the flood pulses on the phytoplankton assemblages in a Danubian floodplain lake (Kopački Rit Nature Park, Croatia)

et al. 2008

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There are several conflicting hypothesis that deal with the influence of flooding in the natural river-floodplain systems. According to the Flood Pulse Concept, the flood pulses are not considered to be a disturbance, while some recent studies have proven that floods can be a disturbance factor of phytoplankton development. In order to test whether flooding acts as a disturbance factor in the shallow Danubian floodplain lake (Lake Sakadaš), phytoplankton dynamics was investigated during two different hydrological yearsextremely dry (2003) without flooding and usually flooded (2004). A total of 18 phytoplankton functional groups were established. The sequence of phytoplankton seasonality can be summarized P/D ? E (W1, W2) ? C/P (only in potamophase) ? S2/H1/S N / S1 ? W1/W2 ? P/D. The canonical correspondence analysis (CCA) demonstrated that the water level was a significant environmental variable in 2004. Due to the higher total biomass of Bacillariophyceae established under potamophase conditions, floodings in the early spring seem to be a stimulating factor for phytoplankton development. On the other hand, the flood pulses in May and June had dilution effects on nutrients, so that a significantly lower phytoplankton biomass was established indicating that flooding pulses can be regarded as a disturbance event. Such conditions supported diatom development (D, P, C species) and prolonged its dominance in the total phytoplankton biomass. A long-lasting Cyanoprokaryota bloom (various filamentous species-S1, S2, S N and H1 representatives) with very high biomass characterized the limnophase (dry conditions) in summer and autumn of both years. In-lake variables (lake morphology, internal loadings of nutrients from sediments, light conditions) seem to be important for the appearance of Cyanoprokaryota bloom. The equilibrium phase was found during the Cyanoprokaryota bloom only in the extremely dry year. This study showed that depending on the time scale occurrence, flood pulses can be a stimulating or a disturbance factor for phytoplankton development in Lake Sakadaš.

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Spatial and temporal diversity of small shallow waters in river Lužnice floodplain

Cited by 28 publications

References 20 publications

Grasping the heterogeneity of kettle hole water quality in Northeast Germany

Grasping the heterogeneity of kettle hole water quality in Northeast Germany

The influence of extreme floods from the River Danube in 2006 on phytoplankton communities in a floodplain lake: Shift to a clear state

Dual impact of the flood pulses on the phytoplankton assemblages in a Danubian floodplain lake (Kopački Rit Nature Park, Croatia)

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