Utjecaj hidrološkog stresa na praživotinje u obraštaju sedrenih barijera

master's thesis

• Title (english): The influence of hydrological stress on periphytic protozoa of tufa barriers
• Author: Petra Lordan
• Mentor: Renata Matoničkin Kepčija (mentor)
• Committee member: Renata Matoničkin Kepčija (predsjednik povjerenstva)
• Committee member: Vesna Petrović Peroković (član povjerenstva)
• Committee member: Mirela Sertić Perić (član povjerenstva)
• Committee member: Iva Juranović Cindrić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2018-09-28, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Obraštaj ili perifiton podrazumijeva zajednicu mikroorganizama i njihovih zajedničkih ekstracelularnih produkata na površini koja je povremeno ili stalno u vodi. Ovu zajednicu čine različite skupine organizama među kojima su i praživotinje koje predstavljaju važan biomedijator osedravanja. Cilj istraživanja bio je utvrditi i usporediti otpornost praživotinja na hidrološki stres u vidu visokih protoka na umjetnim podlogama (predmetna stakalca) na postajama u sklopu Nacionalnog parka „Krka“: Skrdinski buk i Roški slap kroz razdoblja prosječnog i visokog protoka tijekom jednogodišnjeg razdoblja (rujan 2013. - listopad 2014.). Iako se navedene postaje nisu međusobno značajno razlikovale po fizikalno-kemijskim parametrima vode, sastav praživotinja na istraživanim postajama se uvelike razlikovao. Dominantna skupina su bili trepetljikaši sa udjelom od 97% u brojnosti praživotinja na obje postaje. Hidrološki stres utjecao je pozitivno na brojnost praživotinja na postaji Roški slap, a negativno na brojnost praživotinja na postaji Skradinski buk. Na postaji Roški slap dominirale su pokretne svojte, većinom dorzo-ventralno spljoštenog oblika, koje su se pokazale otpornim na hidrološki stres, dok su zajednice Skradinskog buka činile većinom sesilne svojte (sisaraci i kružnotrepetljikaši), koje su se pokazale manje otpornim na visoke protoke. Sastav obraštaja pod snažnim je utjecajem uzvodnih područja, pri čemu jezero Visovac ima velik utjecaj na biocenoze Skradinskog buka.

Abstract (english)

Peryphiton is the community of microorganisms and their mutual extracellular products on a surface that is constantly or occasionally in water. This community includes different organisms, among others protozoans and they represent one of the important biomediators of tufa deposition. The aim of this study was to determine and compare protozoan resistance on hydrological stress caused by high discharge, using artificial substrates (glass slides) during one year period (September 2013 - October 2014) on two locations within Krka National Park: Roški slap (RS) and Skradinski buk (SB) during low and high discharge. Although two sites had almost equal physical and chemical parameters, the protozoan assemblages differed. Ciliates dominated in abundance with an average share of 97%. Hydrological stress had positive effect on protozoan abundance on Roški slap site, while Skradinski buk site showed much lower abundance in these conditions. Vagile, flattened forms of ciliates dominated periphyton in site Roški slap and they coped well with hydrological stress, while sessile ciliates (Peritrichia and Suctoria) dominated between ciliates on Skradinski Buk site, and they showed significant decrease in abundance caused by hydrological stress. The composition of periphyton is under a great influence of upstream areas, with Visovac lake having a great influence on Skradinski buk biocenosis.

• Keywords: umjetne podloge; nacionalni park „Krka“; trepetljikaši; pokretne svojte; sesilne svojte
• Keywords (english): artificial substrates; Krka National Park; ciliates; vagile forms; sessile forms
• Language: croatian
• URN:NBN: urn:nbn:hr:217:348954
• 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; Embargo expiration date: 2020-09-28
• Created on: 2018-10-29 11:37:11