Ćurčić, M. et al: Comparison of silicate ...... Archives for Technical Sciences 2020, 22(1), 51-58 Technical Institute Bijeljina, Archives for Technical Sciences. Year XII – N 0 22. 51 Original Scientific paper UDK 582.26(497.6):[551.311.1:556.53 DOI: 10.7251/afts.2020.1222.051C COBISS.RS-ID 8859160 COMPARISON OF DIATOMS IN WELL AND DRENOVAĈA SWAMP IN VELINO SELO VILLAGE, IN BOSNIA AND HERZEGOVINA Ćurĉić Milenko 1 , Milinković Dragica 1 , Radivojević Dragana 1 , Đurić Dijana 2 1 Faculty of Education, University of East Sarajevo, Bosnia and Herzegovina, e.mail. ljekobilje@teol.net 2 Faculty of Civil Engineering Subotica, University of Novi Sad, Serbia ABSTRACT: Parallel with the research of Bacillariophyta flora in the well with shadoof on the area of Semberija was researched Bacillariophyta flora of other freshwater systems that are located in the near or distant environment from the researched wells, such as Drenovaĉa swamp, Sava river, Jelaz canal, artesian wells and ephemeral swamps. It is very interesting to compare Bacillariophyta flora that inhabits wells and Bacillariophyta flora of Drenovaĉa swamp that is only a dozen meters away from the researched well of Lazić Mijo, a local in the village Velino Selo. All identified Bacillariophyta in researched well belong to aerophile, which indicates on certain ecology of the well, that is a specific life conditions that are present in wells as anthropogenic creations. Contrary to the well flora, Bacillariophyta flora of Drenovaĉa swamp is composed party of algae belonging to benthos. In Lazić Mijo well were identified 33Bacillariophyta, all aerophile, while in Drenovaĉa swamp were identified 57 Bacillariophyta, from which only 18 are aerophile and others belong to benthos. Considering that Bacillariophyta is a component of aeroplankton, and that via air currents can be transmitted over long distances, it is assumed that similarly aerophile Bacillariophyta were transmitted on mosses associations on the well wall, manifested their adaptive attributes in such biotopes, and by that became autochthonous flora of the well. Large qualitative differences in Bacillariophyta flora in wells with shadoof and in Bacillariophyta flora of Drenovaĉa swamp also indicate on autochthony of Bacillariophyta flora of the well, which means that species were not transmitted from the neighborhood. Key words: aerophile, swamp, benthos, well, diatoms INTRODUCTION Floristic researches of Bacillariophyta in wells with shadoof are poor in world literature. In the area of former Yugoslavia, the first researches of this algae were conducted in the period from 1981 to 1993 [1,2,3,4,5,6,7]. Our research included several wells and other freshwater ecosystems on the area of Semberija, and the subject of this paper is a comparison of identified Bacillariophyta flora of a well that is located near Drenovaĉa swamp and Bacillariophyta flora of the same swamp. The collection of researches showed that there is no large similarity in the number of prominent Bacillariophyta in the well and the swamp even though they are only ten meters away from each other. Of course, the physical – chemical factors