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The task of optimal management of the dam reservoir ecosystem was formulated in a very abstract and general way. To solve this problem, on the simplified example of such an ecosystem, method of fuzzy logic was employed. Various scenarios of ecosystem management of dam reservoir has been investigated. Water level changes, inflow of waste waters and fish culturing were taken into consideration. It was...
The paper presents the differences in metabolic processes of the bottom sediments of the River Raba up- and downstream the reservoir and in the Dobczyce Reservoir (southern Poland). In the sediments of the reservoir character and the intensities of metabolic processes were similar. In the river above the reservoir the metabolizm of sediments has the autotrophic character (the ratio of primary production...
Interactions between phyto- and zooplankton species have been discussed on the basis of literature data and partially of own, rather general investigations. The ways of taking food by zooplankton was reviewed. The literature data on potential consumers of phytoplankton taxa of a different size is presented in a tabular form. Two aspects of interactions have been analysed: influence of zooplankton...
The goal of the study was to compare enzymatic activities of Candida albicans, Candida guilliermondii and Rhodotorula glutinis collected from different aquatic ecosystems of Olsztyn. The highest enzymatic activity was observed in isolates obtained from astatic reservoirs (isolates of Candida albicans and Rhodotorula glutinis produced the complete set of 19 hydrolases tested). A slightly lower enzymatic...
The tenor in organic matter has been assessed in an urban aquatic ecosystem the Mfoundi River Basin of Cameroon.The double technique of the Biochemical Oxygen Demand (BOD5) and the Oxydability test have been employed in this assessment. The results obtained indicate a high content of organic matter in the watershed with the highest values of BOD 297.5 mg O2 dm-3 and Oxydability 50.255 mg O2 dm-3 observed...
This article introduces the rationale and the brief review of the content of the selected papers from the International Symposium “Ecohydrology for sustainable water ecosystems and society in Ethiopia” held on 18th-21st of November 2009 in Addis Ababa, Ethiopia” organized by the European Regional Centre for Ecohydrology under the auspices of UNESCO and the Ministry of Water and Energy of Ethiopia,...
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