Dr. Fűköh Levente szerk.: Malakológiai Tájékoztató 12. (Eger, 1993.)

I. FINTHA-P. SÜMEGI-G. SZILÁGYI: A New Biotope of Chilostoma banaticum (Rossmässler, 1838) in Hungary and its Nature Conservational Asppects

A New Biotope of Chilostoma banaticum (Rossmässler, 1838) in Hungary and its Nature Conservational Asppects I. Fintha-P. Sümegi-G. Szilágyi Abstract: In this paper a recently found biotope of Chilostoma banaticum and its ecological characteristics are discussed, considerint the faune-historical and palaentological aspects of the species, as well as the possible way of the colonization of the population. Statistical analysis of shell parameters and some characteristics of the biotope important from a nature conservational point of view are also mentioned. István Fintha from the Hortobágy National Park Authority during his field studies in September, 1992 has found adult individuals of Chilostoma banaticum near Tiszabecs (NE-Hungary). In the course of the subsequent joint visit of the authors to the area it has been turned out that a new, until now unknown biotope of Chilostoma banaticum was found, where juvenile and adult individuals of the species could be collected. The characteristics of the new biotope are as follows: The biotope Szabó-füzes, Tiszabecs, along the Hungarian-Ukrainian border part of River Tisza, 50500 m far from the river on the left, Hungarian side of it, with a 1.5-2 km length. Vegetation Remarkably disturbed with semi-cultural features. The original vegetation might be a soft wood gallery forest, remained patches of which consist of Salix triandra, S. alba and Populus nigra. In the plantation replacing the gallery forest Robinia pseudoacacia is the dominant tree species with Acer negundo, Sambucus nigra and S. ebulus, but individuals of Chilostoma banaticum were found in the actively cultivated walnut (Juglans regia) platations as well. The most characteristic plant species of the undergrowth of all forest types are Urtica dioica and Stellaria media. On the other hand one can find there two interesting species (Fintha I. 1992, manuscript), namely Telekia speciosa, which has its only occurrence on the Hungarian Great Plain here and Heracleum mantegazziani, with its sometimes more than 3 m tall individuals, and also other species (Impatiens galdulifera, Chrysosplenium alternifolium, etc.) demonstrating that the original vetetation of the area could be very valuable with a lot of species which were carried into the biotope by the river and populations of wich successfully established here. Today only relic patches of this original valuable vegetation are found on the area. Seat-rock Fluviatile, clayey silt, mixed with gravel, with carbonate free, water-affected flood plain soil on it, rich in SÍO2 (pH: 5.5-6.0).