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The Lower Paraguay river-floodplain habitats in the context of the Fluvial Hydrosystem Approach

100%

Drago E. C., Wantzen K. M., Paira A. R.

International Journal of Ecohydrology and Hydrobiology

2008

tom 08

nr 1

We report herein the first description of the physical structure of the aquatic habitats of the Lower Paraguay River along 390 km from Asunción city (Paraguay) to the confluence with the Paraná River. The hierarchical ordination of the Fluvial Hydrosystem Approach (FHA) allowed us to classify the Lower Paraguay as a meandering functional sector where five functional sets were identified: (a) main channel, (b) floodplain channel, (c) floodplain lentic environment, (d) tributary, and (f) aquatic-terrestrial transition zone. These functional sets encompassed twenty one functional units and sixty one major mesohabitats. We attribute the riverine habitat diversity to the changes in the channel-floodplain morphology and in the strength, duration and frequency of their hydrological connectivity. The variable riverfloodplain- tributary complex developed several types of fluvial-lacustrine boundaries and riverine ecotones.

Aquatic habitats of the Upper Paraquay River-Floodplain-System and parts of the Pantanal (Brazil)

100%

Wantzen K. M., Drago E., Da Silva C. J.

International Journal of Ecohydrology and Hydrobiology

2005

tom 05

nr 2

The Paraguay-Paraná river system forms an important ecological corridor across South America. Here, we report the first description of the fluvial geomorphology and the physical structure of aquatic habitats along the main channel a 200-km long section of the Upper Paraguay River between Cáceres city and Taiamã island (Mato Grosso, Brazil). Four functional sets were identified: (a) main channel and anabranches, (b) floodplain channel, (c) floodplain lake, and (d) aquatic-terrestrial-transition zone. The diversity of functional units was higher in the meandering and transitional sectors (Brillouin index 1.957 and 2.003) than in the straight and fluviolacustrine sectors (Brillouin index 1.562 and 1.577, respectively). In the transversal dimension, the relatively homogeneous habitats of the main channel contrasted with the heterogeneous floodplain habitats. We attribute this morphological diversity to changes in the hydrological connectivity, caused e.g. by drifting large macrophyte mats or by multi-year periods of higher and lower inundation phases.

Ograniczanie wyników

2 International Journal of Ecohydrology and Hydrobiology

2 Wantzen K. M.

1 Da Silva C. J.

1 Drago E.

1 Drago E. C.

1 Paira A. R.

1 2008

1 2005

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The Lower Paraguay river-floodplain habitats in the context of the Fluvial Hydrosystem Approach

Aquatic habitats of the Upper Paraquay River-Floodplain-System and parts of the Pantanal (Brazil)