Utjecaj hidromorfoloških promjena srednjeg i donjeg toka rijeke Save na zajednicu mekušaca (Mollusca: Gastropoda, Bivalvia)

master's thesis

• Title (english): The impact of hydromorphological changes of middle and lower course of the Sava River on molluscan assemblages (Mollusca: Gastropoda, Bivalvia)
• Author: Svjetlana Dekić
• Mentor: Jasna Lajtner (mentor)
• Committee member: Jasna Lajtner (predsjednik povjerenstva)
• Committee member: Jasenka Sremac (član povjerenstva)
• Committee member: Nenad Buzjak (član povjerenstva)
• Committee member: Sven Jelaska (član povjerenstva)
• Committee member: Renata Matoničkin Kepčija (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2013-07-08, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Cilj ovog rada bio je utvrditi utjecaj hidromorfoloških promjena srednjeg i donjeg toka rijeke Save na zajednicu mekušaca. Istraživanje je provedeno tijekom jeseni 2011. godine na ukupno 10 postaja. Skupljeni su kvantitativni uzorci na umjetnom i prirodnom supstratu. Zabilježeno je ukupno 25 vrsta mekušaca, od kojih je 17 vrsta puževa i 8 vrsta školjkaša. Na prirodnom supstratu pojavljuje se veći broj vrsta mekušaca, a na umjetnom supstratu vrste imaju veću gustoću (osobito puževi). Tijekom istraživanja pronađene su tri invazivne vrste školjkaša: Corbicula fluminea, Dreissena polymorpha i Sinanodonta woodiana. Vrsta C. fluminea je dominantna vrsta školjkaša cijelom dužinom istraživanog toka bez obzira na tip supstrata. Zajednice mekušaca ne pokazuju longitudinalni gradijent jer na pojedinim postajama mikrostanište uvjetuje sastav zajednice. Možemo zaključiti da hidromorfološke promjene toka rijeke mijenjaju sastav zajednica mekušaca te dovode do poremećaja u strukturi i funkciji biocenoze.

Abstract (english)

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.

• Keywords: hidromorfološke promjene; rijeka Sava; mekušci; invazivne vrste
• Keywords (english): hydromorphological changes; the Sava River; molluscs; invasive species
• Language: croatian
• URN:NBN: urn:nbn:hr:217:921562
• Study programme: Title: Enviromental Sciences; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra struke znanosti o okolišu (magistar/magistra struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-04-27 07:35:05