Puhatestű közösségek térbeli mintázata és diverzitása eltérő vízterek mentén

Bódis, Erika and Tóth, Bence and Pohner, Zsuzsanna and Szekeres, József and Bíró, Péter and Ács, Éva (2013) Puhatestű közösségek térbeli mintázata és diverzitása eltérő vízterek mentén. Acta Biologica Debrecina. Supplementum oecologica hungarica, 31. pp. 9-21. ISSN 0236-8684

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Abstract

In this study we examined the structure and diversity of malacological communities at human disturbed and undisturbed sites of oxbow lakes and medium-sized rivers in the water system of the River Danube and Tisza. Sampling was carried out at total 33 sites in 2011 and 2012. According to the malacological species composition and the water chemistry the sampling sites of the water system of the River Danube and Tisza, and certain water bodies can be distinguished. An unambiguous pattern cannot be observed according to the presence-absence of human disturbance. However the Shannon-Wiener diversity and the number of endangered and rare species was significantly higher in the undisturbed Mosoni-Danube, and the number of invasive species was higher at the antropogenically disturbed sampling sites. A total of 49 species were collected, among them 29 species are common, 6 species are endangered and protected in Hungary (Unio crassus, Pseudanodonta complanata, Anisus vorticulus, Borysthenia naticina, Esperiana daudebartii, Esperiana esperi, Theodoxus danubialis), 7 species are rare in Hungary (Pisidium amnicum, Sphaerium rivivola, Sphaerium solidum, Acroloxus lacustris, Anisus spirorbis, Bathyomphalus contortus, Physa fontinalis), and 6 species are invasive. The two endangered bivalve species cannot be found in the oxbow lakes, and the occurrence frequency and density of P. complanata was very low in the studied rivers. The invasive C. fluminea was recorded in the tributary Ipoly, Rába, Bodrog only at sampling sites located close to the mouth of river, and it was not found in the reaches of Tisza above Tokaj. The study was supported by the Hungarian Scientific Fund (KTIA-OTKA) under the contract No. CNK80140.

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