Procjena utjecaja urbanizacije na proljetnu dinamiku makrozoobentosa, drifta i fizikalno-kemijskih značajki vode duž potoka Bliznec

master's thesis

• Title (english): Assessment of urbanization influence on the spring dynamics of macrozoobenthos, drift and physicochemical water characteristics along Bliznec stream
• Author: Matea Svoboda
• Mentor: Mirela Sertić Perić (mentor)
• Committee member: Mirela Sertić Perić (predsjednik povjerenstva)
• Committee member: Sara Essert (član povjerenstva)
• Committee member: Draginja Mrvoš-Sermek (član povjerenstva)
• Committee member: Vesna Petrović Peroković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2020-09-29, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Istraživanje je provedeno na urbanom potoku Bliznec. Bliznec izvire u Parku prirode Medvednica i teče kroz središte grada do odvodnog kanala koji se ulijeva u rijeku Savu. Cilj ovog istraživanja bio je procijeniti promjene kvalitativnog i kvantitativnog sastava organizama makrozoobentosa u uzorcima bentosa i drifta te fizikalno-kemijske značajke vode na tri postaje smještene duž potoka Bliznec tijekom proljeća (travnja i lipnja) 2016. godine. Najuzvodnija postaja B1 bila je smještena unutar... More Parka prirode Medvednica, postaja B2 predstavljala je srednji tok potoka, dok je najnizvodnija postaja B3 bila smještena u najurbaniziranijoj zoni. Na sve tri postaje, tijekom svakog izlaska na teren, sakupljeni su triplikatni uzorci bentosa i drifta. Uzorci su podvrgnuti postupku izolacije organizama makrozoobentosa te determinacije pomoću lupe u svrhu kvalitativne i kvantitativne analize. Mjereni fizikalno-kemijski parametri vode uključivali su: temperaturu vode, masenu koncentraciju otopljenog kisika, volumni udio kisika, električnu provodnost vode, pH, ukupnu koncentraciju otopljenih soli, kemijsku potrošnju kisika, alkalinitet, ukupnu tvrdoću vode, masene koncentracije nitratnih, nitritnih i fosfatnih iona te koncentraciju klorofila a u bentosu. Premda vrijednosti ključnih fizikalno-kemijskih parametara nisu ukazale na statistički značajne razlike među postajama, opažen je njihov porast s porastom urbanizacije duž toka potoka Bliznec. U prosjeku najveća brojnost jedinki makrozoobentosa u bentosu je zabilježena u donjem dijelu toka, uz najveći udio Oligochaeta, Chironomidae, Ephemeroptera i Trichoptera. Najuzvodnija postaja (smještena unutar Parka prirode Medvednica) se istaknula najvećom raznolikošću organizama, premda je na sve tri postaje opažena dominacija Oligochaeta - skupine tolerantne na onečišćenje. U prosjeku najveća zabilježena gustoća drifta bila je u donjim dijelovima toka, gdje je zabilježena i prosječno najviša brzina strujanja vode. U gornjem dijelu toka, u driftu je opažena zastupljenost terestričkih organizama, vjerojatno zbog prisutnosti guste obalne vegetacije u šumskom području Parka prirode Medvednica. U donjem dijelu toka, u driftu je zabilježena velika brojnost planktonskih rakova rašljoticalaca (Cladocera), za koje se pretpostavlja da su otplavnjeni iz uzvodno smještenog Maksimirskog jezera. Less

Abstract (english)

The research was conducted on the urban stream Bliznec. Bliznec sources in the Medvednica Nature Park and flows through the city center to a drainage canal that flows into the Sava River. The aim of the present research was to assess changes in the qualitative and quantitative composition of macrozoobenthos within benthos and drift samples, and physicochemical water properties at the three sampling sites located along the Bliznec stream during spring (April, June) 2016. Site B1 was the... More uppermost site located within the Medvednica Nature Park, site B2 represented the middle stream reach, whereas the lowermost site B3 was located in the most urbanized zone. At each site, on each sampling occasion, triplicate benthos and drift samples were collected. The samples were subjected to isolation and determination of macrozoobenthos by stereomicroscope, for the purpose of its qualitative and quantitative analysis. The measured physicochemical water parameters included: water temperature, mass concentration of dissolved oxygen, oxygen saturation, electrical conductivity, pH, total concentration of dissolved salts, chemical oxygen demand, alkalinity, total water hardness, mass concentrations of nitrate, nitrite and phosphate ions and concentration of benthic chlorophyll a. Although the values of key physicochemical parameters did not indicate statistically significant differences between the sampling sites, their increase was observed with the increase of urbanization along the Bliznec stream. On average, the highest number of macrozoobenthos in benthos samples was recorded in the lower stream reaches, with the highest share of Oligochaeta, Chironomidae, Ephemeroptera and Trichoptera. The uppermost station (located within the Medvednica Nature Park) showed the greatest organism diversity, but at all three stations the dominance of Oligochaeta was observed. On average, the highest recorded drift density was in the lower stream reaches, where also the highest mean flow velocity was recorded. In the upper stream reaches, terrestrial organisms were observed in drift, probably due to the presence of dense riparian vegetation in the forest area of Medvednica Nature Park. In the lower stream reaches, a large number of planktonic cladoceran crustaceans (Cladocera) was recorded, which presumably drifted from the upstream Maksimir Lake. Less

• Keywords: urbani potok; fizikalno-kemijski parametri; bentos; drift; beskralježnjaci; antropogeni učinak
• Keywords (english): macrozoobenthos; benthos; drift; physicochemical parameters of water; anthropogenic impact
• Language: croatian
• URN:NBN: urn:nbn:hr:217:595395
• Study programme: Title: Integrated undergraduate and graduate university study of Biology and Chemistry Education; specializations in: Integrated undergraduate and graduate university study of Biology and Chemistry Education; Course: Integrated undergraduate and graduate university study of Biology and Chemistry Education; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: magistar/magistra edukacije biologije i kemije (magistar/magistra edukacije biologije i kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-10-27 08:29:28