A Békés Megyei Múzeumok Közleményei 30. (Békéscsaba, 2007)

Deli Tamás: Some data the land snail fauna of Transtisza I. Szatmár-Beregi-sík

Deli Tamás Some data to the land snail fauna of Transtisza I. Szatmár-Beregi-sík - Tamás Deli Resume This paper collects the results of the malacofaunistic studies carried out between 1993 and 2005 in the Szatmár-Beregi-sík. The outcome of the research in the past 13 years is 801 items (11,731 specimens) of 50 species (including the ones came up from the scum) detected in the Szatmár-Beregi-sík. In addition to the faunistic data, I describe the land snail fauna of the particular biotopes by emphasizing the characteristic species. Beyond the malacofaunistic investigations, I have tried to find an answer to the question how the expansion of the particular land snail species could proceed from the direction of the mountainous district towards the flatland region. For this, I have compared the fauna of one mountainory reach of Tisza (next to Huszt) with the recens and scum fauna in the flood plain of Bagiszeg (Vásárosnamény). Furthermore, in some cases, I have examined what kind of relic faunas had remained on the "hills" standing out in flatland, and what kind of role they could had played in the development of the malacofauna of the flatland forests. In zoogeographical characterization, I have laid a particular stress on the high proportion of Carpathian endemisms (14 percent) in the almost entirely closed forest fauna, being a unique characteristic in the Alföld (Great Plain). Deli Tamás Békés Megyei Múzeumok Igazgatósága H-5600 Békéscsaba, Gyulai út 1. E-mail: deli@bmmi.hu 42