20.500.12556/RUL-154489 Vpliv različnih taksonov v zooplanktonu na strukturo fitoplanktonske združbe Influence of various zooplankton taxa on the structure of phytoplankton community Namen magistrskega dela je ugotoviti učinke različnih zooplanktonskih taksonov na strukturo fitoplanktonske združbe in povezave s spremembami koncentracij nutrientov. Na jezeru Klostersee smo vzpostavili sistem 35 mezokozmosov s 7 različnimi okolji zooplanktonskih taksonov, prefiltriranih i z omenjenega jezera. V obdobju od 14.7. do 2.8.2021 smo v teh okoljih vzorčili in določali količine hranil, fitoplanktona in zooplanktona. Hranila in fitoplankton smo vzorčili zjutraj z integriranim vzorčevalnikom z globine 4 m in 1 m. Zooplankton smo vzorčili ponoči z vertikalnim dviganjem z globine 4 m. Ugotovili smo, da je pogostost cianobakterij (Cyanophyta) naraščala zaradi selektivne paše herbivorega taksona Eudiaptomus gracilis. Največje zmanjšanje gostote fitoplanktona, oziroma ple- njenje s stranih herbivorov je bilo v okoljih s prevladujočim taksonom Cladocera in v okoljih s taksonoma Cladocera in Copepoda. V okolju, kjer je bil priso- ten predatorski takson Chaoborus spp., je bil takson Copepoda manj plenjen kot takson Cladocera. Opazili smo upad koncentracije silikata in nato diatomej. The main goal of the master’s thesis was to investigate the influence of various zooplankton taxa on the structure of phytoplankton community according to va- riations in nutrient concentrations. A system of 35 mesocosms with 7 different treatments was established on the Klostersee lake and filled with zooplankton taxa from it. Experiment was performed from 14.7. to 2.8.2021, where nutrients, phytoplankton and zooplankton were sampled and later analyzed. Nutrients and phytoplankton were sampled in the mornings with the integrated sampler from 4 m and 1 m depth. Zooplankton was towed in the night time from 4 m depth. We found that the frequency of cyanobacteria (Cyanophyta) increased due to selec- tive grazing of the herbivorous taxa Eudiaptomus gracilis. The greatest decrease of the phytoplankton density (herbivore predation) was in the treatments domi- nated by Cladocera taxa and Cladocera taxa combined with Copepoda taxa. In the treatments with carnivore taxa Chaoborus spp., the Copepoda taxa was less preyed compared to the Cladocera taxa. A decline in the silica concentration and later diatoms was noticed. zooplankton fitoplankton prehranjevalni splet mezokozmos limnologija zooplankton phytoplankton food web mesocosms limnology true false false [E. Mur Eržen] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2024-02-17 07:15:48 2024-02-17 07:15:52 2024-02-26 10:42:47 0000-00-00 00:00:00 2024 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 556.55(043.2) 236269 186734339 38397.pdf 38397.pdf 1 B339D61A1EEC1A311CBDAE3AC078B7C4 5dc0bcda642921b3aa18f9e6d8a81402d876100d4c32ec23d778ed3c1b16e47f 011d1a97-cd5c-11ee-a3c7-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=180949 Biotehniška fakulteta 0 0 0