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Abstract
Saprobiological investigation using plankton is a part of everyday monitoring practice for determination of water quality in Hungary. However there is an important question: Is this way of using plankton (mainly phytoplankton) good enough and bringing enough information? We can hear, this method is too old and its result are not collateral with different chemical way's describing saprobity. Another problem of this biological method is being so labor-intensive, demanding a well qualified knowledge on algology and protozoology. To solve these problems and questions we examined saprobiological and the chemical results, describing water quality of tributaries of Hungarian Upper-Tisa, in years 2001-2002. Summarizing results of our investigations, we can say: biological (saprobiological) method of analyses for saprobity is not worse than chemical ways and can give us more information about ecological parameters.
... Ortendorfer and Hofrat's list of indicator species was used for determination of water quality (Ortendorfer and Hofrat, 1983). Most of the indices were transformed on the basis of Felfoldy (1987) and Turoboyski (1979) to determine the category of saprobity (Imre, 2004;Dulic et al., 2006). ...
The species diversity of a cultural eutrophic lake at Ranchi was studied in relation to external variables (forcing functions) and internal or state variables. The lake receives daily detergent inputs in the form of washings of a variety of objects. A model was constructed for the estimation of detergent inputs from the increase in the phosphate concentration, and from changes in the concentration of inorganic carbon. Nutrients such as inorganic carbon, nitrates, phosphates, sulphates were found to be high in contrast to natural unpolluted systems. The DOM, COD and BOD were also found to be high suggesting organic pollution of the system with an organic carbon load of 5.4 m moles l-1. The growth and development of the plankton constituents was studied in this regime. The natural planktonic rhythm was found to be modified by the polluted condition existing in the lake. The phytoplankton exhibited four peaks in March, May, August, and November while, the zooplankton showed three peaks in February, July and October. The abundance of zooplankton during the annual cycle oscillated with that of the phytoplankton. There was much more evenness in the zooplankton population in comparison to the phytoplankton. Analysis of both, the zooplankton as well as the phytoplankton population was done using the Bray-Curtis dissimilarity index, importance value index and Shannon-Weaver diversity index. The importance value index was found to provide a better evaluation of the plankton community than the diversity index. The phytoplankton population showed no correlation with nutrient availability as indicated by the correlation-regression analysis and the planktonic rhythm was not in tune with normal unpolluted conditions. The lake was classified as meso-polysaprobic using biological and chemical indices (Pantle and Buck index:3.5, BOD:60; DOM:9.3 and COD: 130).
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