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DIATOM DIVERSITY IN SOME NATURA 2000 HABITATS IN VITOSHANATURE PARKP. Ivanov, Tz. IshevaFaculty of Biology, Sofia University „St. Kliment Ohridski”, 8 Dragan TsankovBlvd., 1164 Sofia; E-mail: plamen_new@abv.bgТhe algal flora of Vitosha Mts. is not yet thoroughly studied although its proximityto the city of Sofia. In the period 2008-2010, the diatom diversity was investigatedon the territory of Nature Park (NP) Vitosha within a project framework forinvestigation of the algal diversity in the park. The basins of the streams Bistrishka,Boyanska and Struma were studied in subsequent Natura2000 habitats, situatedalong the streams from their springs to the point where they leave Vitosha NP.During the seasonal field visits, samples for diatoms were collected from varioushabitats and substrates. The samples were processed in a laboratory, based on thenewest European standards. Observations by scanning electron microscopy wereconducted and many taxa were photo-documentated. The results show very highdiatom diversity: a total of 354 species, varieties and forms were identified. Theybelonged to 69 genera. New for Bulgarian diatom flora were 82 taxa (23% from allidentified taxa). A new diatom species belonging to the genus Gomphonema wasfound as well as a new morphotype of the same genus. Among the species, 59 hadthe status of rare, including 24 extremely rare and found only in few localitiesworldwide (such as Luticola charlatii, Navicula harderii); 106 species are in theRed List of Diatoms, 5 of which are almost extinct (such as Achnanthes rupestris,Eunotia triodon) and 6 are extremely endangered. Based on the changes in thetaxonomic composition of diatoms, a polluted part of Boyanska Stream wasdetermined, in an anthropogenically affected stretch of the stream. The studiedNatura2000 habitats and stream catchments in Vitosha NP are important forconservation because they possess high abundance of diatoms as well as many rareand endangered species.14:15-14:30КОНСЕРВАЦИОННА ЗНАЧИМОСТ НА ФАУНАТА НАСУХОЗЕМНИТЕ ОХЛЮВИ В БЪЛГАРИЯИ. ДедовЦентрална лаборатория по обща екология, БАН, ул. Гагарин № 2,1113 София, Е-поща: idedov@gmail.comФауната на сухоземните охлюви в България се състои от над 250 таксона отвидовата група. От тях почти половината (113 таксона) са консервационнозначими. Към тази група се отнасят ендемити (42 български и 36 балкански),реликтни видове – остатъци от палеогенната (9 таксона) или неогеннатафауна (33 таксона), а също и видове със стопанско ползване като биологичниресурси (2 вида).64