Nature conservation oriented algal biodiversity monitoring investigations in the main arm and some dead arms of the River Tisza II. Phytoplankton

Kiss, Keve Tihamér and Ács, Éva (2002) Nature conservation oriented algal biodiversity monitoring investigations in the main arm and some dead arms of the River Tisza II. Phytoplankton. In: Proceedings of the 34th conference in Tulcea, Romania, 2002. Limnological reports (34). Academiei Romane, Bukarest, pp. 163-171. ISBN 9789732709153

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Abstract

The species composition and to a certain extent the individual number of the phytoplankton in the studied dead arms in the floodplain of the River Tisza is basically determined by the most important water supply, the river itself, which enters the dead arms during floods. After floods, when the connection between the main arm and the dead arms discontinued, the phytoplankton of the dead arms „remember?” its origin but then gradually changes and start to resemble the algae flora of lentic waters also developing several unique characters. The algal flora of nearly all investigated dead arms had a nature conservation value primarily because of their diversity, or the presence of several rare algae. From among the investigated dead arms, Kacsa-tó, Marót-zugi-holt-Tisza and Oláh-zugi-holt-Tisza showed less obvious natural values partly due to neighbouring villages partly due to human use (mainly intensive angling). Human impacts are the least pronounced at the Remete-zugi-Holt-Tisza, which has important natural values. It should be stressed, however, that the valuable algae flora of one or another site can only be maintained by the protection of the habitat (dead arm) and its watershed. In the case of less valuable dead arms (e.g. the eastern part of the Kacsa-tó, Oláh-zugi-holt-Tisza) it might mean the acceptance of the present situation with some improvement (e.g. controlling the number of angles around the dead arm). In other cases direct human use should be stopped and dead arm reconstruction is to be made to help the development of semi-natural conditions, e.g. at the Remete-zugi-holt-Tisza.

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