The impact of hydromorphological changes of middle and lower course of the Sava River on molluscan assemblages (Mollusca: Gastropoda, Bivalvia)

Dekić, Svjetlana (2013) The impact of hydromorphological changes of middle and lower course of the Sava River on molluscan assemblages (Mollusca: Gastropoda, Bivalvia). Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

The aim of this study was to determine the effect of hydromorphological changes of middle and lower course of the Sava River on molluscan assemblages. Field research was carried out during autumn 2011 at 10 sites. Quantitative samples of natural and artificial substrate were collected. A total of 25 species of molluscs, of which 17 species of snails and 8 species of bivalves were recorded. More species of molluscs were found on natural substrate, but species achieve higher densities on artificial substrate (especially snails). We recorded three invasive bivalves: Corbicula fluminea, Dreissena polymorpha and Sinanodonta woodiana.C. fluminea is a dominant bivalve throughout the investigated part of the course regardless of the type of substrate. The molluscan assemblages did not show a longitudinal gradient because microhabitat determines the composition of the assemblages on individual sites. We can conclude that hydromorphological changes of the river course alter molluscan assemblages and induce disturbance in structure and function of the biocenosis.

Item Type: Thesis (Diploma thesis)
Keywords: hydromorphological changes, the Sava River, molluscs, invasive species
Supervisor: Lajtner, Jasna
Date: 2013
Number of Pages: 54
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 30 Sep 2014 09:24
Last Modified: 30 Sep 2014 09:24
URI: http://digre.pmf.unizg.hr/id/eprint/2875

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