20.500.12556/RUL-188442 Vpliv vodostaja in človekovih posegov v strugo reke Stržen na strukturo makroinvertebratske združbe The influence of water level and human interventions in the channel of the Stržen river on the structure of the macroinvertebrate community V magistrski nalogi smo preučevali vpliv vodostaja in človekovih posegov v strugo reke Stržen na strukturo makroinvertebratske združbe. Ker je bil Stržen v preteklosti reguliran, pred nekaj leti pa so bili na njem izvedeni renaturacijski projekti, nas je zanimalo ekološko stanje vodnega ekosistema po posegih. Vzorčenje je potekalo na dveh renaturiranih in dveh naravnih (referenčnih) odsekih vodotoka, kjer smo izvedli meritve fizikalno-kemijskih in hidromorfoloških parametrov, določili procent pokrovnosti makrofitskih vrst ter nabrali vzorce makroinvertebratov. Pri analizi podatkov smo izračunali abundanco makroinvertebratov ter različne diverzitetne in biotske indekse, na podlagi katerih smo ugotavljali, kakšni sta struktura in pestrost makroinvertebratske združbe. V vzorcih smo našli 10994 osebkov makroinvertebratov, ki smo jih razvrstili v 27 različnih družin, izmed katerih je bila najbolj zastopana družina Chironomidae. Spremembe v višini vodostaja so vplivale na določene abiotske dejavnike in na abundanco ter pestrost makroinvertebratov. Glede na primerjavo z rezultati iz leta 2021 je razvidno predvsem izboljšanje razmer v renaturiranem malem okljuku (vzorčno mesto M), kjer se je pestrost makroinvertebratov povečala. Človeški posegi v vodotok so negativno vplivali na ekološke razmere reke Stržen, ker pa je ponovna vzpostavitev vodnega ekosistema dolgotrajen proces, predvidevamo, da bo kompleksnost makroinvertebratske združbe v naslednjih letih naraščala. In this master's thesis, we researched the influence of water level and human intervention in the channel of the Stržen river on the structure of the macroinvertebrate community. Since Stržen was regulated in the past and renaturation projects were conducted on it a few years ago, we evaluated the ecological state of the ecosystem after the interventions. Sampling took place in two renatured and two natural (reference) sections of the watercourse, where we measured physical, chemical and hydromorphological parameters, determined the percentage of macrophyte species coverage and collected macroinvertebrate samples. When analysing the data, we calculated the abundance of macroinvertebrates and various diversity and biotic indices, based on which we determined the structure and diversity of macroinvertebrate community. We found 10,994 macroinvertebrate individuals, which we classified into 27 different families, of which the Chironomidae family was the most represented. Changes in water level affected certain abiotic factors, the abundance and diversity of macroinvertebrates. Compared to the results from 2021, the improvement of conditions in the renatured small bend (sample site M) is particularly evident, because the diversity of macroinvertebrates has increased. Human interventions in the watercourse have negatively affected the ecological conditions of the Stržen river, but since the restoration of aquatic systems is a long-term process, we expect that the complexity of the macroinvertebrate community will increase in the following years. makroinvertebrati reka Stržen Cerkniško jezero vodostaj ekološko stanje pestrost macroinvertebrates Stržen river lake Cerknica water level ecological state biodiversity true false false [M. Štuhec] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-09-23 07:18:48 2026-09-23 07:18:51 2026-09-25 09:15:46 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 574:592/595(282Stržen)(043.2) 290916 292463363 62552.pdf 62552.pdf 1 6B8ECF7FE262F4783DF7BA681459E893 95c0bc5e2c585f52d414cee95379cc355e74a11769d97ae854be132cb4e8cbe2 32449947-b70e-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=248618 Biotehniška fakulteta 0 0 0