Dijatomeje kao biološki pokazatelji ekološkog stanja izvora rijeke Gacke

master's thesis

• Title (english): Estimating ecological status using diatoms in two springs of Gacka River
• Author: Mirela Šušnjara
• Mentor: Marija Gligora Udovič (mentor)
• Committee member: Marija Gligora Udovič (predsjednik povjerenstva)
• Committee member: Dražen Balen (član povjerenstva)
• Committee member: Zlatko Mihaljević (član povjerenstva)
• Committee member: Neven Bočić (član povjerenstva)
• Committee member: Vlasta Ćosović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2016-02-26, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Prema Okvirnoj Direktivi o vodama (ODV) bentičke dijatomeje predstavljaju jedan od pet bioloških elemenata kakvoće vode koji se koriste za procjenu ekološkog stanja rijeka i izvora. Fitobentos dvaju izvora rijeke Gacke, Tonkovića vrila i Majerovog vrila, uzorkovan je od ožujka do rujna 2014. godine. U 12 uzoraka određeno je ukupno 52 vrste dijatomeja. Dominantne vrste u oba izvora bile su Achnanthidium minutissimum, Cocconeis placentula, Meridion circulare i Staurosirella pinnata. Subdominantne... More vrste zabilježene tijekom lipnja i rujna su Cymbella lange-bertalotii i Encyonema ventricosum. Fizikalno-kemijski čimbenici koji utječu na sastav dijatomejske zajednice su pH, alkalinitet, provodljivost i brzina strujanja vode. Prema indikatorskim vrijednostima najveći broj dijatomejskih vrsta opisan je kao alkalifilne i cirkumneutralne, oksifilne vrste tipične za eutrofna i oligo-eutrofna staništa. Ekološko stanje izvora procijenjeno je na temelju trofičkog indeksa dijatomeja (TIDRH) i saprobnog indeksa (SIHRIS). Ekološko stanje Majerovog vrila ocijenjeno je kao dobro, dok je ekološko stanje Tonkovića vrila vrlo dobro. Less

Abstract (english)

According to the Water Framework Directive (WFD) benthic diatoms constitute one of five biological quality elements used for ecological assessments of rivers and springs. Diatom communities in the two karstic springs of Gacka River, Tonkovića and Majerovo vrilo, were sampled monthly from March to September 2014. Diatom flora consisted of 52 taxa, with Achnanthidium minutissimum, Cocconeis placentula, Meridion circulare and Staurosirella pinnata as the most abundant species. Subdominant taxa in... More June and September included Cymbella lange-bertalotii and Encyonema ventricosum. Main environmental variables influencing diatom communities were pH, conductivity, alkalinity, oxygen saturation and current velocity. Most of the taxa were alkaliphilous and circumneutral, eutraphentic and oligo- to eutraphentic, with fairly high to continuously high oxygen requirements. The ecological status of springs was estimated by using Trophic Diatom indeks (TIDHR) and Saprobic Index (SIHRIS). According to both indices the ecological status of Majerovo vrilo was estimated as moderate (mesotrophic to meso-eutrophic) and Tonkovića vrilo as high (oligotrophic to oligo-mesotrophic). Less

• Keywords: bentičke dijatomeje; krški izvori; ekološko stanje; trofički indeks dijatomeja
• Keywords (english): benthic diatoms; karstic springs; trophic indices; ecological assessment
• Language: croatian
• URN:NBN: urn:nbn:hr:217:812251
• Study programme: Title: Enviromental Sciences; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra struke znanosti o okolišu (magistar/magistra struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-05-12 11:33:36