Zajednica puževa (Mollusca, Gastropoda) izvora rijeke Gojačke Dobre: stanje prije izgradnje HE Lešće

master's thesis

• Title (english): Snail fauna (Mollusca, Gastropoda) of the Gojačka Dobra River springs: status before the construction of HPP Lešće
• Author: Katarina Gatarić
• Mentor: Jasna Lajtner (mentor)
• Committee member: Jasna Lajtner (predsjednik povjerenstva)
• Committee member: Ines Radanović (član povjerenstva)
• Committee member: Zora Popović (član povjerenstva)
• Committee member: Draginja Mrvoš-Sermek (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2015-06-08, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Glavni cilj ovog rada bio je odrediti sastav i strukturu zajednice slatkovodnih puževa izvora rijeke Gojačke Dobre. Istraživanje je provedeno u razdoblju od lipnja 2008. godine do svibnja 2009. godine na osam postaja kojima su obuhvaćeni glavni izvor Gojak (D1) i izvorišni tok rijeke Gojačke Dobre (D2), četiri manja izvora uz njezin tok (IZV-SKU, IZV-GOR, IZV-TOM, D5) te izvori njezinih glavnih pritoka, Bistrice (B1) i Ribnjaka (R1). Na svim postajama uzorci makrozoobentosa skupljani su na kamenitoj podlozi, a na postajama D2, B1 i R1 uzorci su uzimani i s mahovine. Iznimka je izvor u Gorincima gdje je prevladavao muljeviti supstrat. Nakon izdvajanja iz bentosa puževi su u laboratoriju determinirani do razine vrste. Iz dobivenih podataka o brojnosti jedinki za svaku vrstu utvrđena je gustoća populacije. Tijekom istraživanja pronađeno je ukupno 13 vrsta puževa, a dominantna vrsta na svim istraživanim postajama bila je Sadleriana fluminensis. Na postajama D2, B1 i R1 veća brojnost jedinki zabilježena je na kamenitoj podlozi. Provedena analiza funkcionalnih hranidbenih skupina pokazala je da strugači i detritivori imaju podjednak udio, dok je udio ostalih skupina zanemarivo mali. Margalefov indeks bogatstva vrsta bio je najveći na kamenom supstratu izvorišnog toka Gojačke Dobre. Najviše vrijednosti Shannonovog i Simpsonovog indeksa raznolikosti, kao i Pieoulovog indeksa ujednačenosti utvrđene su na na mahovini u izvorišnom toku Gojačke Dobre. Najniže vrijednosti svih indeksa zabilježene su na mahovini u izvoru Ribnjaka. Klaster analizom sastava zajednice puževa ustanovljeno je grupiranje izvora Ribnjaka i Bistrice s jedne, te glavnog izvora Gojak i manjih izvora uz Gojačku Dobru, s druge strane. Dobiveni podaci daju značajan doprinos boljem poznavanju faune slatkovodnih puževa rijeke Gojačke Dobre, ali predstavljaju i osnovu za praćenje promjena nastalih izgradnjom HE Lešće.

Abstract (english)

The main objective of this study was to determine diversity and community structure of the freshwater snails from the Gojačka Dobra River springs. Field research was conducted from June 2008 to May 2009 at eight locations which include the main source Gojak (D1) and the source stream of the river Gojačka Dobra (D2), four small springs along its course (IZV-SKU, IZV-GOR, IZV-TOM, D5) and the sources of its major tributaries, Bistrica (B1) and Ribnjak (R1). At all locations macroinvertebrate samples were collected from the rocky ground, while at the stations D2, B1 and R1 samples were also taken from the moss. The exception was the source of the Gorinci where the muddy substrate was prevailing. Snails were separated from the benthos sample in the laboratory and then were determined to the species level. Population density of each species was determined based on the number of individuals. In this study, a total of 13 species of freshwater snails was found and the dominant species at all investigated locations was Sadleriana fluminensis. At the locations D2, B1 and R1 greater number of individuals was recorded on the rocky ground. The analysis of functional feeding guilds showed that scrapers and detritivores were equally present, while presence of other groups was negligible. Margalef's richness index was the highest on the stone substrate of the location D2. The highest values of the Shannon’s and Simpson’s diversity index, and the Pielou's evenness index were found on the same location, but on the moss substrate. Cluster analysis of similarity showed grouping of sources Ribnjak and Bistrica on one side, and the main source Gojak and smaller sources along Gojačka Dobra on the other side. The resulting data provide a significant contribution to a better knowing of the fauna of freshwater snails of the Gojačka Dobra River, and also provide the basis for tracking changes resulting from the construction of HPP Lešće.

• Keywords: gustoća populacije; funkcionalne hranidbene skupine; mekušci
• Keywords (english): population density; functional feeding guilds; molluscs
• Language: croatian
• URN:NBN: urn:nbn:hr:217:019145
• 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
• Created on: 2017-04-21 10:10:42