Slatkovodna malakofauna rijeke Bednje

master's thesis

• Title (english): Freshwater malacofauna of the Bednja River
• Author: Marcela Jadrić
• Mentor: Jasna Lajtner (mentor)
• Committee member: Jasna Lajtner (predsjednik povjerenstva)
• Committee member: Ines Radanović (član povjerenstva)
• Committee member: Vesna Petrović Peroković (član povjerenstva)
• Committee member: Draginja Mrvoš-Sermek (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2019-10-18, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Glavni cilj ovog diplomskog rada bio je utvrditi raznolikost i uzrasnu i funkcionalno trofičku strukturu zajednice slatkovodnih puževa i školjkaša u rijeci Bednji. Uzorci makrozoobentosa prikupljani su tijekom ljetnih mjeseci 2015. godine na 20 lokaliteta raspoređenih duž rijeke Bednje pomoću bentos mreže (kracer). Puževi i školjkaši su u laboratoriju odvojeni od ostalih skupina te su konzervirani u 75%-tnom alkoholu. Uz pomoć dihotomskih ključeva puževi i školjkaši determinirani su do razine vrste izuzev školjkaša iz roda Pisidium. Tijekom istraživanja ukupno je pronađeno 15 vrsta puževa i pet vrsta školjkaša. Najzastupljenije vrste puževa bile su Holandriana holandrii (C. Pfeiffer, 1828) i Theodoxus danubialis (C. Pfeiffer, 1828), dok je od školjkaša najzastupljeniji rod Pisidium. Pronađena je i jedna invazivna vrsta školjkaša Dreissena polymorpha (Pallas, 1771). Analiza uzrasne strukture je pokazala da su juvenilne jedinke dominantnije u odnosu na odrasle jedinke. Provedena analiza funkcionalnih hranidbenih skupina puževa pokazala je da najveći udio imaju strugači, a slijede ih detritivori, dok su svi školjkaši filtratori. Rezultati klaster analize su potvrdili da zajednice mekušaca u rijeci Bednji ne pokazuju izrazit longitudinalni gradijent. Rezultati ovog diplomskog rada doprinijet će boljem poznavanju malakofaune rijeke Bednje.

Abstract (english)

The main objective of this study was to determine the diversity, age and functional trophic structure of the freshwater snail and bivalve community in the Bednja River. Macrozoobenthos samples were collected during summer months of 2015 at 20 localities distributed along the Bednja River using a bentos net (kracer). Snail and bivalve species were separated from other groups in the laboratory and preserved in 75% alcohol. With the help of dichotomous keys, snails and bivalve moluscs were identified to the species level with the exception of the genus Pisidium. During the investigation, a total of 15 snail and five bivalve species were found. The most common snail species was Holandriana holandrii (C. Pfeiffer, 1828) and Theodoxus danubialis (C. Pfeiffer, 1828) while the most common bivalve was the genus Pisidium. Furthermore, an invasive bivalve species Dreissena polymorpha (Pallas, 1771) was also found. The analysis of the age structure showed that juvenile specimens were dominant over adult specimens. Conducted analyses of functional feeding groups of snails showed that grazers were present with the highest share, followed by detrivores, while all bivalve species are filterers. The results of the cluster analysis confirmed that molluscan communities in the Bednja River do not show a pronounced longitudinal gradient. Results presented in this thesis will contribute to a better knowledge of the freshwater malacofauna of the Bednja River.

• Keywords: mekušci; gustoća populacije; uzrasna struktura; funkcionalne hranidbene skupine
• Keywords (english): molluscs; abundance; growth structure; functional feeding guilds
• Language: croatian
• URN:NBN: urn:nbn:hr:217:031937
• 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: Open access; Embargo expiration date: 2021-10-18
• Created on: 2019-11-20 08:07:55