No public access
master's thesis
Comparative analysis of epilithic microphytic communities from an Upper and Middle Danube River section (Austria Croatia)

Marina Ivanković (2015)
Sveučilište Josipa Jurja Strossmayera u Osijeku
Odjel za biologiju
Metadata
TitleKomparacija epilitskih zajednica mikrofita u gornjoj i srednjoj dionici Dunava (Austrija - Hrvatska)
AuthorMarina Ivanković
Mentor(s)Melita Mihaljević (thesis advisor)
Abstract
Istraživanja obraštajnih zajednica kamenitih podloga (epiliton), s ciljem utvrđivanja strukture mikrofitskih zajednica, provedena su na 10 lokaliteta u gornjoj (Austrija) te na dva lokaliteta u srednjoj dionici Dunava (Hrvatska). Određena su fizikalno-kemijska svojstva vode, biomasa epilitonskog obraštaja te kvalitativni i kvantitativni sastav mikrofita (alga i cijanobakterija). Usporedba epilitona na postajama sa sličnim lokalnim karakteristikama na obje dionice potvrdila je da se u srednjoj dionici Dunava, suprotno gornjoj dionici, razvija manja biomasa epilitona te mikrofitske zajednice u ranoj fazi sukcesije karakterizirane malom brojnošću i dominacijom dijatomeja. To sugerira da regionalne karakteristike gornje dionice Dunava pružaju bolje uvjete za razvoj mikrofitskih zajednica. Epilitske zajednice smještene na postajama s različitim lokalnim karakterisitkima u gornjoj dionici Dunava bile su u različitom stupnju sukcesije, od početnih stadija razvoja, preko ranih kolonizacijskih do potpuno trodimenzionalno razvijenih zajednica. U ranim stadijima sukcesije uglavnom su dominirale dijatomeje koje priliježu uz podlogu s malom biomasom, dok su u kasnom stadiju razvoja dominirale filamentozne cijanobakterije i/ili zelene alge s velikom biomasom. Dobiveni rezultati ukazuju na moguću povezanost razvoja mikrofita s fizičkom stabilnošću podloga na ovim postajama. Za potvrdu takve povezanosti potrebna su daljna detaljnija istraživanja.
Keywordsmicrophytic communities algae cyanobacteria Upper Danube Middle Danube
Parallel title (English)Comparative analysis of epilithic microphytic communities from an Upper and Middle Danube River section (Austria Croatia)
Committee MembersMelita Mihaljević (committee chairperson)
Elizabeta Has Schon (committee member)
Filip Stević (committee member)
Thomas Hein (committee member)
GranterSveučilište Josipa Jurja Strossmayera u Osijeku
Odjel za biologiju
PlaceOsijek
StateCroatia
Scientific field, discipline, subdisciplineNATURAL SCIENCES
Biology
Study programme typeuniversity
Study levelgraduate
Study programmeMaster of Science Graduate University Study Programme in Biology; specializations in: Master of Biology
Study specializationMaster of Biology
Academic title abbreviationmag.biol.
Genremaster's thesis
Language Croatian
Defense date2015-05-15
Parallel abstract (English)
Epilithic microphytic communities from twelve habitats were studied, of which ten are situated in the Upper Danube section (Austria) and two in the Middle Danube section (Croatia). The physico-chemical water properties were estimated, as well as the epilithic biomass, qualitative and quantitative structure of the algae and cyanobacteria in the epilithon. The comparison of microphytic communities from habitats with similar local settings from the two Danube sections confirmed that the present communities highly differ in terms of biomass, as well as in their qualitative and quantitative structure. The Upper Danube showed better conditions for the accrual and development of epilithic microphytes. The Middle Danube microphytes, on opposite to Upper Danubes, were clearly diatom dominated and characterized with low biomass. The epilithic communities situated on habitats with different local settings within the Upper Danube primarily confirmed the presence of a distinguishable succession pattern from tightly attached, early colonizer to filamentous, mature microphytic communities. Small prostrate algae with low biomass dominated in the early succession phase characterized, while the more mature communities showed a tendency to a community dominated by filamentous cyanobacteria and/or green algae with higher biomass values. Those results suggest that the microphytic succession depends on the physical substrate stability of a habitat. To clearly confirm the existence of such a relationship more precise future investigations are needed.
Parallel keywords (Croatian)mikrofitske zajednice alge cijanobakterije Gornji Dunav Srednji Dunav
Resource typetext
Access conditionNo public access
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:181:275229
CommitterVesna Radman Meic