Estimating ecological status using diatoms in two springs of Gacka River

Šušnjara, Mirela (2016) Estimating ecological status using diatoms in two springs of Gacka River. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

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 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).

Item Type: Thesis (Diploma thesis)
Keywords: benthic diatoms, karstic springs, trophic indices, ecological assessment
Supervisor: Gligora Udovič, Marija
Co-supervisor: Žutinić, Petar
Date: 2016
Number of Pages: 46
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 24 Mar 2016 12:08
Last Modified: 24 Mar 2016 12:08
URI: http://digre.pmf.unizg.hr/id/eprint/4615

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