Freshwater marsh vegetation response to flooding patterns in the lower delta of the Parana river

Kandus, Patricia; Adámoli, Jorge M.

doi:10.1007/bf00188155

Cited by 11 publications

(9 citation statements)

References 11 publications

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“…Vegetation of deltas forming in natural lakes or in estuaries has been studied more thoroughly (e.g. Kandus & Adamoli, 1993; Golub & Barmin, 1995; Vadineanu et al ., 1998), but extrapolation to reservoirs may be tenuous because of the greater water surface fluctuations behind hydroelectric dams (Hill, Keddy & Wisheu, 1998).…”

Section: Novel Ecosystemsmentioning

confidence: 99%

Riparian vegetation diversity along regulated rivers: contribution of novel and relict habitats

2002

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1. The creation and maintenance of spatial and temporal heterogeneity by rivers flowing through floodplain landscapes has been disrupted worldwide by dams and water diversions. Large reservoirs (novel ecosystems) now separate and isolate remnant floodplains (relict ecosystems). From above, these appear as a string of beads, with beads of different sizes and string connections of varying lengths. 2. Numerous studies have documented or forecast sharp declines in riparian biodiversity in relict ecosystems downstream from dams. Concurrently, novel ecosystems containing species and communities of the former predam ecosystems have arisen along all regulated rivers. These result from the creation of new environments caused by upper reservoir sedimentation, tributary sedimentation and the formation of reservoir shorelines. 3. The contribution of novel habitats to the overall biodiversity of regulated rivers has been poorly studied. Novel ecosystems may become relatively more important in supporting riverine biodiversity if relict ecosystems are not restored to predam levels. The Missouri River of the north‐central U.S.A. is used to illustrate existing conditions on a large, regulated river system with a mixture of relict and novel ecosystems.

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Section: Novel Ecosystemsmentioning

confidence: 99%

Riparian vegetation diversity along regulated rivers: contribution of novel and relict habitats

2002

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“…Likewise, the colonization and growth of free-floating plants native to South America have been related to water level variations in the Amazon floodplain (Junk 1986;Junk Piedade 1997). Moreover, the distribution and diversity of hydrophytes in the lower delta of the Paraná River respond to flooding patterns and landscape configuration (Kandus and Adamoli 1993).…”

Section: Introductionmentioning

confidence: 99%

Water level as the main driver of the alternation between a free-floating plant and a phytoplankton dominated state: a long-term study in a floodplain lake

et al. 2010

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This 10-year field data study explores the relevance of water level fluctuations in driving the shift from a free-floating plant (FFP) to a phytoplankton dominated state in a shallow floodplain lake from the Lower Paraná River. The multi-year natural flood pulse pattern in the Lower Paraná River drove the ecosystem regime from a FFP-dominant state during very high waters (1998)(1999) to absolute phytoplankton prevalence with blooms of nitrogen fixing Cyanobacteria during extreme low waters (2008)(2009). Satellite images support the observed changes over the decade and show the decrease of the surface lake area covered by FFP as well as the modification of the spectral firm in open waters, which documents the significant increases in phytoplankton chlorophyll a concentrations. We discuss the possibility that, despite a slow eutrophication in these highly vegetated systems, water level changes and not nutrients account for the shift from a floating macrophyte community to phytoplankton dominance. Cyclic shifts may occur in response to the seasonal floodpulse, but more strongly, as indicated by our results, in association to the extreme drought and flood events related to the El Niño Southern Oscillation, which is linked to discharge anomalies in the Paraná River.

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“…The Lower Delta is a heterogeneous region, with important environmental dissimilarity in flood pattern, geomorphology in the islands, human activity and vegetation patterns (Kandus and Adámoli, 1993). The main variation in chemical water composition accounted for different conditions determined by water level in a complex fluvial system.…”

Section: Discussionmentioning

confidence: 99%

“…The climate here is humid temperate without a dry season (Cabrera and Willink, 1980). Freshwater marshes cover 16% to 50% (according to the zone) of the floodplain (Kandus and Adámoli, 1993). This area could be influenced by 'Sudestada', which is a strictly local meteorological phenomenon, and is bad weather in the Río de la Plata area.…”

Section: Study Areamentioning

confidence: 99%

Physicochemical variables and plankton from the Lower Delta of the Paraná River (Argentina) in relation to flow

Cabo¹,

Puig²,

Arreghini³

et al. 2003

Hydrological Processes

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Abstract:This study evaluates temporal variations of physicochemical variables and densities of phytoplankton and zooplankton, under different flow conditions. Four samplings were carried out at four sites on the Lower Delta of the Paraná River (Argentina). This first approach was developed in 1995 and included a flood of high amplitude and average duration. Daily data analysis along the year qualified sampling water levels as very high, medium (two opportunities) and low level. Triplicate subsuperficial water samples were taken in the middle of the navigation channel. Dissolved oxygen, pH, conductivity and temperature were determined in situ; nutrients and concentration of major solutes in the laboratory. Quantitative samples of phytoplankton (concentrated by sedimentation) and zooplankton (80 l; 48 µm) were obtained. Temporal variation of most physical, chemical and biological variables exceeded the spatial variation. Physicochemical variables were mainly associated in time with the hydrological regime. In the main channel water exchange originated by the flood of marshy environments caused dissolved oxygen, nitrate and sulphate to decrease and phosphate, conductivity, bicarbonate, calcium and magnesium to increase. The dilution-concentration action of flow was evidenced in chloride variation (conservative ion). The plankton variables would be affected directly and indirectly by water level, and also by seasonal climatic condition. The densities of phytoplankton and zooplankton increased during low flow. For some organisms, the variation in density exceeded the simple concentration effect of flow decrease. The lowest plankton densities coincided with a temperature minimum.

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Freshwater marsh vegetation response to flooding patterns in the lower delta of the Parana river

Cited by 11 publications

References 11 publications

Riparian vegetation diversity along regulated rivers: contribution of novel and relict habitats

Riparian vegetation diversity along regulated rivers: contribution of novel and relict habitats

Water level as the main driver of the alternation between a free-floating plant and a phytoplankton dominated state: a long-term study in a floodplain lake

Physicochemical variables and plankton from the Lower Delta of the Paraná River (Argentina) in relation to flow

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