Makrozoobentos u listincu na sedrenim barijerama Plitvičkih jezera

master's thesis

• Title (english): Macrozoobenthos in leaf litter at Plitvice Lakes tufa barriers
• Author: Ivona Cafuta
• Mentor: Renata Matoničkin Kepčija (mentor)
• Committee member: Renata Matoničkin Kepčija (predsjednik povjerenstva)
• Committee member: Božena Mitić (član povjerenstva)
• Committee member: Domagoj Đikić (član povjerenstva)
• Committee member: Ines Radanović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2013-06-21, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Sedrene barijere su mjesta zadržavanja listinca u kaskadnom sustavu Plitvičkih jezera. U ovom radu istražene su razlike u sastavu makrozoobentosa naseljenog u paketićima listinca dviju čestih biljnih vrsta na Plitvičkim jezerima - zeljastog lopuha (Petasites spp.; autohtoni listinac) i drvenaste bukve (Fagus sylvatica L.; alohtoni listinac). Istovremeno je praćena razgradnja listinca i njegovo osedravanje na ukupno četiri mikrostaništa, različita po brzini strujanja vode i stopi osedravanja. Paketići listinca bili su izloženi prirodnim uvjetima na sedrenim barijerama tijekom jedne godine uz ekspoziciju od mjesec dana. Rezultati ovog rada ukazuju da se listinac lopuha razgrađuje brže od listinca bukve. Za obje vrste listinca opaženo je brže raspadanje u mikrostaništima s visokom stopom taloženja sedre i brzom strujom vode. Brzina strujanja vode također je značajno utjecala i na sastav makrozoobentosa u listincu. U uvjetima brze struje vode, neovisno o tipu listinca, u makrozoobentosu su dominirale ličinke Simuliidae. Sastav makrozoobentosa u mikrostaništima sa sporom strujom vode razlikovao se s obzirom na tip listinca, na način da su na listincu bukve dominirali Ephemeroptera, a na listincu lopuha Chironomidae. U trofičkoj strukturi makrozoobentosa u brzoj struji vode dominirali su pasivni filtratori, a u sporoj struji vode detritivori i predatori, a zatim usitnjivači. S obzirom na relativno malu brojnost usitnjivača u listincu, može se zaključiti da usitnjivači nemaju znatan utjecaj na fragmentaciju listinca te da osedravanje može učiniti listinac nedostupnim kao izvor hrane.

Abstract (english)

Tufa barriers within the cascading Plitvice lakes hydrosystem are the sites that accumulate the considerable amounts of leaf litter. This thesis investigates the structural and functional differences of the macrozoobenthos colonized within the leaf litter bags of the two common, but differing plants at the Plitvice lakes - butterbur (Petasites spp.; aquatic vegetation; representing autochtonous leaf litter) and beech (Fagus sylvatica L.; woody vegetation; alochtonous leaf litter). Simultaneously, a leaf litter decomposition and the respective tufa deposition effects were investigated on four microhabitats, differing in flow velocity and tufa deposition rate. During this one-year study, the leaf litter bags were exposed to the natural tufa barrier conditions for one month. The results of this thesis suggest that the butterbur decomposes faster than the beech leaf litter. It was observed that the both leaf litter types fragment faster in the fast flowing microhabitats with high tufa precipitation rates. The flow velocity significantly affected the macrozoobenthos structure within the leaf litter bags. In the fast flow environments, regardless the leaf litter type, Simuliidae were the dominant taxon, while within the slow flow the macrozoobenthos composition depended on the leaf litter type – Ephemeroptera dominated within the beech, and Chironomidae within the butterbur leaf litter bags. Regarding the trophic structure of macrozoobenthos, at the fast flowing sites the passive filtrators prevailed, and at the slow flowing sites the most numerous were the detritivores, predators and shredders. Considering the rellatively low numbers of shredders within the leaf litter bags, it is likely that shredders do not considerably affect the leaf litter decomposition. As well, it is likely that because of the tufa deposition, leaf litter becomes unreachable and unsuitable as a macroinvertebrate food source.

• Keywords: lopuh; bukva; brzina strujanja vode; osedravanje listinca
• Keywords (english): butterbur; beech; flow velocity; tufa deposition on leaf litter
• Language: croatian
• URN:NBN: urn:nbn:hr:217:509357
• Study programme: Title: Ecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra ekologije i zaštite prirode (magistar/magistra ekologije i zaštite prirode)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-04-25 12:35:46