Alge kremenjašice - biološki element kakvoće vode u bentosu akumulacija rijeke Drave

master's thesis

• Title (english): Diatoms - biology quality element of_water in benthos of river Drava reservoirs
• Author: Ema Keder
• Mentor: Anđelka Plenković-Moraj (mentor)
• Committee member: Anđelka Plenković-Moraj (predsjednik povjerenstva)
• Committee member: Ines Radanović (član povjerenstva)
• Committee member: Zora Popović (član povjerenstva)
• Committee member: Vesna Petrović Peroković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2013-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Dijatomeje ili alge kremenjašice dominantna su komponenta perifitona/bentosa te sastavom i brojnosti vrsta odražavaju fizikalna i kemijska obilježja vodotoka. Istraživanje je provedeno tijekom četrnaest godina, od 1999. do 2012. godine u sustavu akumulacija rijeke Drave (Varaždin, Čakovec i Dubrava), smještenim u sjevernom dijelu Hrvatske. Uzorci bentosa uzorkovani su struganjem akumuliranog perifitona sa potopljenih stabala, kamenja ili šljunka. Za svaki uzorak izračunata je relativna brojnost, a za praćenje promjena unutar zajednica dijatomeja iz dobivenih podataka izračunati su slijedeći indeksi: trofički indeks dijatomeja, opći indeks dijatomeja, Shannon–Wiennerov, Margalefov, Simsonov i Pielou-ov indeks, indeks saprobnosti te ukupan broj vrsta te je ustanovljeno postoje li statistički značajne razlike među njima s obzirom na postaje odnosno godine uzorkovanja. Dobivene vrijednosti dodatno su uspoređene sa fizikalno–kemijskim parametrima vode radi određivanja relevantnosti algi kremenjašica kao indikatora kakvoće vode. Rezultati su pokazali da dolazi do značajnih promjena u sastavu i brojnosti dijatomeja kao i samih vodenih uvjeta. Ukupan broj dijatomeja u prosjeku je niži svake godine, a povećava se pH vrijednost, nutrijenti i trofija proučavanih vodenih staništa.

Abstract (english)

Diatoms are usually the dominant component of periphyton/benthos and they reflect physical and chemical conditions of the water. Investigation was conducted seasonally during the period of fourteen years, from 1999 to 2012 in River Drava system of reservoirs (Varaždin, Čakovec and Dubrava), situated in the North part of Croatia. Samples were taken scraping the sunken trees, stones or pebbles. For each sample relative abundance was calculated. To explore changes inside diatom community based on collected data, several indexes were calculated: Trophic Diatom Index, Generic Diatom Index, Shannon–Wienner Margalefs, Simpsons, Pielou's index, saprobity index and species richness and it was determined if there are any statistical differences between years, sampling points and reservoirs. Results were compared with physical and chemical water parameters to determine relevance of diatoms as indicators for water quality. The results showed that there are significant changes in the composition and abundance of diatoms and also in water conditions. The total number of diatoms in average is lower each year and values of pH, nutrients and trophic level increases in studied aquatic habitats.

• Keywords: dijatomeje; monitoring; hrvatski indeks dijatomeja; indeks saprobnosti; trofički indeks
• Keywords (english): diatoms; monitoring; generic diatom index; saprobity index; trophic diatom index
• Language: croatian
• URN:NBN: urn:nbn:hr:217:130773
• 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: Access restricted to students and staff of home institution
• Created on: 2017-04-27 09:04:45