20.500.12556/RUL-145223 Združbe makroinvertebratov in makrofitov v izbranih kalih na Krasu Communities of macroinvertebrates and macrophytes in selected karst ponds on the Karst plateau V magistrski nalogi smo preučevali združbe makroinvertebratov in makrofitov v izbranih kalih na Krasu. Lokacije 16 kalov smo izbrali na istih mestih, kot so znani iz diplomske naloge, ki je bila zaključena pred 12 leti, kar nam je omogočalo primerjavo določenih parametrov in sestavo združbe makrofitov. Na terenu smo popisali ožje prispevno območje kalov, izmerili fizikalne in kemijske dejavnike, popisali makrofite, vzorčili makroinvertebrate ter zabeležili prisotnost rib. V laboratoriju smo v vzorcih vode določili količino nitratov in fosfatov. Na podlagi vseh zbranih podatkov smo naredili statistične analize, izračunali diverzitetne indekse in naredili direktno gradientno analizo, da smo videli, kateri dejavniki vplivajo na sestavo preučevanih združb. V povprečju smo v kalih izmerili visoko koncentracijo hranil, koncentracija in nasičenost s kisikom sta bili odvisni od prisotnosti primarnih producentov v kalih, izmerili smo tudi visoke temperature vode, kar je za te plitve ekosisteme poleti značilno. V vseh kalih skupaj smo našli 44 različnih taksonov makrofitov. Na sestavo združbe makrofitov vplivata raba tal v prispevnem območju in prosojnost vode. Določili smo skupno 28 družin makroinvertebratov. Nekateri kali imajo zelo nizko pestrost, saj smo v enem našli le eno družino makroinvertebratov, medtem ko smo v najbolj pestrem kalu našli 16 družin. Na združbo makroinvertebratov so vplivali elektroprevodnost, prisotnost rib, koncentracija klorofila a in temperatura vode. Ribe smo našli v štirih kalih. We studied communities of macrophytes and macroinvertebrates in selected ponds on the Karst plateau. 16 locations were chosen from older graduation thesis, so we could compare the changes of certain parameters and community structure of macrophytes in 12 years. During the fieldwork, we assessed the catchment area of each pond, measured environmental parameters, made an inventory of macrophytes, took samples of macroinvertebrates and checked if there are any fishes in the ponds. We determined concentrations of nitrates and phosphates in the laboratory. We performed statistical analyses with collected data, calculated diversity indices and made direct gradient analysis to see which parameters shape the structure of the studied communities. In general, we measured high concentrations of nutrients in Karst ponds, the concentration and saturation with oxygen mostly depended on presence of primary producers, we also measured high water temperatures, which is typical for this shallow ecosystems in the summer. In total, we found 44 taxa of macrophytes. Land use of the catchment area and Secchi depth influenced the composition of macrophyte communities. We found a total of 28 families of macroinvertebrates. In one pond only 1 family was found, but in most diverse pond we found 16 families. Communities of macroinvertebrates are shaped by electroconductivity, presence of fish, concentration of chlorophyll a and temperature. We found fish in 4 ponds. kali Kras makrofiti makroinvertebrati združbe Karst ponds macrophytes macroinvertebrates communities true false false [N. Štrekelj] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2023-04-13 11:42:51 2023-04-13 11:42:53 2023-04-18 11:56:59 0000-00-00 00:00:00 2023 0 0 0000-00-00 NiDoloceno Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 574 217660 149557251 MAG_Strekelj_Nina_2023.pdf MAG_Strekelj_Nina_2023.pdf 1 A8315A92F15C290B49366F3D0368A1D7 31008ccebba8854a0c6863566223d4f9efa9e2a4d8da6417fa0418b9a471db5b 69773aa3-d9df-11ed-a314-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=167939 Biotehniška fakulteta 0 0 0