Struktura i raznolikost zajednica riba u vodama hidroenergetskog sustava na rijeci Dravi

master's thesis

• Title (english): Structure and diversity of fish communities in the waters of the Drava River hydropower system
• Author: Anja Bukovac
• Mentor: Milorad Mrakovčić (mentor)
• Committee member: Milorad Mrakovčić (predsjednik povjerenstva)
• Committee member: Jasna Hrenović (član povjerenstva)
• Committee member: Sandra Radić Brkanac (član povjerenstva)
• Committee member: Jasna Lajtner (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2012-10-15, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Uslijed tehnološkog napretka, riječni ekosustavi su najviše pogođeni izgradnjom brana i hidroelektrana. One pregrađuju rijeke i utječu na njihove tokove, mijenjajući pritom ekološke uvjete. Na Dravi u Hrvatskoj, zahvaljujući njenom hidroenergetskom potencijalu, izgrađena su tri hidroenergetska sustava. U svrhu utvrđivanja stanja ihtiopopulacije rijeke Drave, vršena su istraživanja na devet postaja hidroenergetskih sustava – Varaždin, Čakovec, Dubrava. Postaje i metode uzorkovanja i obrade su standardizirane, te daju sliku strukture ihtiopopulacije za svaku godinu od 1991. g. do 2010. g. Cilj rada bio je utvrditi promjene u strukturi ihtiopopulacija nastale nakon izgradnje triju hidroelektrana na rijeci Dravi. Raznolikost ihtiofaune je opisana pomoću alfa raznolikosti (indeksi raznolikosti, te grafički prikazi redoslijeda gustoća i K-dominantnosti) i beta raznolikosti (SHE analiza). Rezultati indeksa raznolikosti pokazuju da najveći broj vrsta ne znači nužno najveću ihtioraznolikost. Ukupna raznolikost ihtiofaune nije se znatnije promijenila tijekom cjelokupnog razdoblja istraživanja, ali se promijenila struktura zajednica. Akumulacijska jezera su stvorila nove zajednice lakustričkih vrsta riba s izraženom dominacijom.

Abstract (english)

Due to technological progress, river ecosystems are most affected by hydropower plants and dams. They influence and divert the river's flow, changing ecological conditions at the same time. The river Drava, owing to its hydropower potential, has currently three hydropower systems in Croatia. For the purpose of determining ichthyofauna population in the river Drava, research was performed at nine stations of hydropower systems – Varaždin, Čakovec, Dubrava. Stations and sampling methods are standardised, so they represent ichthyofauna structure for every year in the period from 1991 to 2010. The purpose of this thesis is to define changes in ichthyofauna population, which are the result of construction of three hydropower plants on the river Drava. Diversity of ichthyofauna is described by alpha diversity (diversity indices, the K-dominance and the rank/abundance plot) and beta diversity (SHE analysis). Diversity indices results show us that the highest number of species doesn't mean the highest fish diversity. The total fish diversity hasn't significantly changed during the research period, but the structure of fish communities has changed. Hydropower plant reservoirs have created new lacustric species with expresive domination.

• Keywords: ihtiofauna Drave; bioraznolikost; hidroenergetski sustav; indeks raznolikosti; SHE analiza
• Keywords (english): ichthyofauna of the Drava river; biodiversity; hydropower system; diversity index; SHE analysis
• Language: croatian
• URN:NBN: urn:nbn:hr:217:668248
• Study programme: Title: Ecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra ekologije i zaštite prirode (magistar/magistra ekologije i zaštite prirode)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-04-28 12:27:21