Plant communities and their changes in the surroundings of the Dobczyce Reservoir (Southern Poland) (original) (raw)
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Transformations of flora and vegetation result from natural processes taking place in the landscape as well as various types of human impact leading to synanthropization of the vegetation [1-3]. The changes are gradually accelerated and their scope and scale are increasing. This results from the growing human pressure on natural communities and their environment [4-6]. All the transformations of plant communities involve also other components of ecosystems. This leads to fundamental changes in functioning of the ecosystems [7, 8]. The intensity and types of human impact affect the scope and rate of changes, which are reflected in the decline of species typical of natural vegetation and the creation of new anthropogenic communities [2, 3, 9, 10]. At early stages of synanthropization, floristic diversity usually increases [2, 8, 11, 12], whereas intensification of human impact usually leads to a decline in diversity [13-16]. River valleys are one of the best models for research on species diversity [5, 17, 18], the process of synanthropization [1, 17, 19, 20], the dynamics of flora [21], as well as transformations of the vegetation associated with river val
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Effects of flood on the functioning of the Dobczyce reservoir ecosystem
Hydrobiologia, 2000
The effects of two summer floods, in 1997 and 2001 on phytoplankton, zooplankton and fish in the Dobczyce reservoir are presented. Shifts in phytoplankton distribution (from hypolimnion into the whole water column) and species composition (domination of diatoms after the flood) were observed. High water flow eliminated large species of cladocerans and copepods (the most effective filtrators) and favoured development of rotifers. Both, the total zooplankton biomass and chlorophyll a concentration after the flood dropped considerably. In the case of fish, the observed changes in their distribution and decrease in concentration were attributed to their behaviour. During the flood, fish were avoiding open water also during the night, but two weeks following the flood they returned to their usual migratory behaviour. The Dobczyce reservoir ecosystem showed great regeneration abilities to recover after the flood.
2009
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Hydrobiological status of the Wielki Bytyń reserve area, Poland
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Long-term changes of macrophyte vegetation in lakes of the Dovinė river catchment area
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Changes of submerged vegetation over the last 50 years in lakes Dusia, Simnas, Žuvintas and Amalvas, related with re-arrangement of the Dovinė river basin and alteration of the hydrological regime are discussed. The study is based on reference information and data of recent field investigations. Most significant changes of submerged vegetation were revealed in the shallow Lake Žuvintas. Twenty species of submerged plants became extinct (8 Charophyta, 10 Potamogeton, 2 Bryophyta) in the period from 1961 to 2004. The group of extinct plants includes sparse in the lake and rare in Lithuania species (Tolypella prolifera, Nitella syncarpa, N. mucronata, Fontinalis hypnoides). Formerly abundant and dominant species, such as Chara globularis, C. strigosa, C. hispida, Nitellopsis obtusa, significantly decreased. The increase of the number of charophytes and their abundance in 1997 has indicated that reduction of inflow of nutrients from the basin can significantly improve the state of submerged vegetation in the lake. Significant changes took place only in the deepest (8–10 m) zone of the deep Lake Dusia (mean depth 15.7 m). Vegetation of this zone after damming did not recover and communities formed by filamentous algae and mosses became extinct. The zone of vegetation distribution reduced from 9 to 6 m depth limit. It is possible that in the last 50 years charophytes became extinct in Lake Simnas, whereas in Lake Amalvas pondweeds and possibly charophytes disappeared.