Structure and diversity of fish communities in the waters of the river Drava hydropower system

Bukovac, Anja (2012) Structure and diversity of fish communities in the waters of the river Drava hydropower system. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

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.

Item Type: Thesis (Diploma thesis)
Keywords: ichthyofauna of the Drava river, biodiversity, hydropower system, diversity index, SHE analysis
Supervisor: Mrakovčić, Milorad
Date: 2012
Number of Pages: 108
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 25 Feb 2014 12:47
Last Modified: 18 Sep 2014 12:52
URI: http://digre.pmf.unizg.hr/id/eprint/496

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