%0 Book part %A Sirbu Ioan %D 2002 %G English %B Tiscia monograph series %B Ecological aspects of the Tisa River Basin : 10 years anniversary regional conference 21nd - 24th March 2002., Târgu Mureş, Romania %@ 1418-0448 %T Endangered freshwater mollusc species from the Eastern tributaries of the Tisa river (Romanian territory) %U http://acta.bibl.u-szeged.hu/10259/1/tiscia_mono_006_071-080.pdf %X Based on long-term research this paper aims to reveal the status of 10 highly endangered freshwater mollusc spccics from the eastern Tisa River Basin. In all cases the adverse human pressure (pollution, hydrotcchnical works and drastic reduction of wetlands) is responsible for the present-day status of this fauna, several species having a highly patchy distribution, some became rare or even extinct. Despite these facts some trends of recovery are also registered on the main rivers in Transylvania.