Use of desmids to assess the natural conservation value of a Hungarian oxbow (Malom-Tisza,NE-Hungary) |
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Authors: | Enikő Krasznai Gizella Fehér Gábor Borics Gábor Várbíró István Grigorszky Béla Tóthmérész |
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Institution: | (1) Department of Ecology, Debrecen University, Egyetem tér 1, H-4010 Debrecen, Hungary;(2) Lower Danube Valley Directorate for Environment and Water, Széchenyi u 2/C, H-6500 Baja, Hungary;(3) Environmental Protection, Nature Conservation and Water Authority, Trans-Tiszanian Region, Hatvan u. 16, H-4025 Debrecen, Hungary;(4) Department of Hydrobiology, Debrecen University, Egyetem tér 1, H-4010 Debrecen, Hungary |
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Abstract: | A method recently proposed by Coesel that uses the desmid flora to assess the conservation value of aquatic habitats was applied
to an alkaline and hypertrophic oxbow of the Upper Tisza river (NE Hungary). According to the macrophyte community the oxbow
contains two distinct habitats, both of which provide suitable conditions for the development of a rich desmid flora. High
temporal and spatial differences in the algal flora were observed in periphyton and plankton samples taken in June and August
2004. The sample of Utricularia vulgaris periphyton collected in August was characterised by the most species-rich desmid flora. The conservation value of this sample
was the maximum according to Coesel’s method. The latter also proved to be useful for the assessment of the conservation value
of plankton net samples taken from among the macrophytes. The use of modified rarity value calculations as recently proposed
by Fehér did not significantly affect the conservation value, but different enumeration methods to quantify the floristic
diversity did result in different conservation values. We found that Coesel’s desmid based method is a useful tool for assessing
the conservation value of the studied oxbow. Based our results the Coesel method’s applicability and usefulness depended on
(i) the sampling location (open water or macrophytic region) samples were taken from open water or from macrophytic region;
and (ii) species enumeration procedures (up to 400 specimens counted, or whole droplets counted).
Presented at the International Symposium Biology and Taxonomy of Green Algae V, Smolenice, June 26–29, 2007, Slovakia. |
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Keywords: | oxbow Desmidiales Coesel’ s method nature conservation value |
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