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

To propose a concept of their mutual diversity, twenty-nine permanent shallow floodplain pools and oxbows in the river Lužnice floodplain were analysed for area, depth, shape, flooding, and shading by terrestrial vegetation, and sampled in all seasons for their water chemistry, phytoplankton composi...

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Bibliographic Details
Published in:Hydrobiologia 2007-06, Vol.584 (1), p.265-275
Main Authors: Pithart, David, Pichlová, Radka, Bílý, Michal, Hrbáček, Jaroslav, Novotná, Kateřina, Pechar, Libor
Format: Article
Language:English
Subjects:
Algae
Animal and plant ecology
Animal, plant and microbial ecology
Aquatic plants
artificial shade
Biological and medical sciences
Chrysophyceae
Cladocera
Cryptophyceae
Euglenophyceae
Eutrophication
Flooding
Floodplain
Floodplains
Floods
Freshwater
Fundamental and applied biological sciences. Psychology
General aspects
Herbivores
Lakes
Leaf litter
Oxygen
Oxygen consumption
Photosynthesis
Phytoplankton
Plankton
Rivers
Rotifera
Shallow water
Synecology
Terrestrial ecosystems
Terrestrial-aquatic interactions
Vegetation
Water chemistry
Water depth
Zooplankton
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Summary:To propose a concept of their mutual diversity, twenty-nine permanent shallow floodplain pools and oxbows in the river Lužnice floodplain were analysed for area, depth, shape, flooding, and shading by terrestrial vegetation, and sampled in all seasons for their water chemistry, phytoplankton composition and biomass, and zooplankton composition. The sites are regularly flooded, eutrophic, and often shaded by surrounding vegetation. Cryptophyceae, Chrysophyceae and Euglenophyceae dominated the phytoplankton, while Cyanophytes were rare. Within the rich zooplankton assemblage (63 species), cladocerans and rotifers dominated. Correlation matrices and multivariate analyses indicated that shaded and relatively deeper sites had lower oxygen saturation and higher concentrations of PO₄-P and NH₄-N. Shade and relative depth correlated negatively with phytoplankton biomass and number of phytoplankton taxa, and positively with Cryptophytes and large cladocerans--thus indicating poor mixing, poor light availability and low fish pressure on herbivores. Decomposition of leaf litter increased oxygen consumption, while shade from terrestrial vegetation restricted photosynthesis and decreased oxygen production. Larger sites were more species-rich in phytoplankton and supported Euglenophyceae, green algae and rotifers.
ISSN:0018-8158
1573-5117
DOI:10.1007/s10750-007-0607-8