Uherkovich Ákos: A Barcsi borókás élővilága III. (Dunántúli Dolgozatok Természettudományi Sorozat 3., 1983)

Bába K.: A Barcsi borókás puhatestű faunája (Mollusca). - The mollusc fauna of the Juniper Woodland of Barcs, Hungary

The Mollusc Fauna of Juniper Woodland of Bares, Hungary KÁROLY BÁBA On the basis of six years investigations, the author summarizes the land and water mollusc fauna of the Juniper Woodland at Bares. He investigated 40 sampling sites by quadratic methods (10x25x25 cms)> 119 resp. 207 specimens of 15 water resp. land species were found (Tables 1, 2). Snails resp. shells turned up in 45 p.c. of the water sampling sites and 9.2 p.c. of land ones. The sampling sites are under effects of cultivation. The causes of the poverty in specimens and species are the desiccation of the area, the forest plantations, occupying a large part of the area (Scotch fir). It refers to desiccation that a large part of the land fauna found there, with the exception of two or three species, are meso-hygrophilous. Tiis refers to that the original state was a humid biotope. In the water biotopes, there were found some species different in respect of biotopesand of quantitative relations. I have not investigated into the water snails in the Kisbók and Nagybók swamps. The land biotopes were formed in the water-side strip of waters. In case of the Rigóc brook it could be established that in this area it takes a part in spreading the fauna, similarly to the part of larger rivers in distributing the fauna. This is demostrated in the 100 m stripe by a more and more decreasing number of species and specimens in the different vegetable stocks. The Juniper Woodland at Bares lies at the frontier of two physical-geographical regions (SOMOGYI 1961). The author separated two biotope-groups in the preservation area (sampling sites 8-34 resp. 35-39 and 40) -which can be - on the basis of their vegetation - included in the Dráva Plain resp. Belső-Somogy ( SOÓ 1964). BÁBA (1981) has found the two biotope-groups, based on his results, with a mathematical procedure, to be different on 10 p.c. significance level.The result seems to be supported by the Dráva Plain gallery forest, taken into consideration as 19 controls, with which the gallery forest biotopes of the Juniper Woodland show a nearer similarity than the biotopes of the Austrian oak grove ( Table 3). It is to be established that - on the basis of the average A per sq. m. percentages - the biotopes of gallery forests are under a stronger Submediterranean effect and the ratio of the Pontomediterranean fauna elements (Pagetum illiricum) is very high in them. In the fauna of'the biotopes of Austrian oak forests the continental and Holomedietrranean effects are stronger. The differentiating elements of the biotopes in the gallery forest and the Austrian oak forest are the fauna-elements of Turkestan and Boreo-Alps (Table 4). Author's address: Dr. K. Bába H-7620 SZEGED Vár u. 6. 125