Vodena vegetacija Visovačkog jezera

master's thesis

• Author: Ivan Gulin
• Mentor: Antun Alegro (mentor)
• Committee member: Antun Alegro (predsjednik povjerenstva)
• Committee member: Sandra Hudina (član povjerenstva)
• Committee member: Duje Lisičić (član povjerenstva)
• Committee member: Renata Šoštarić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2018-11-23, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Visovačko jezero nalazi se u Nacionalno parku Krka te predstavlja najveće proširenje toka rijeke Krke. U srpnju 2018. uzorkovana je vegetacija metodom transekata koji se pružaju okomito na obalu do dubine na kojoj se prestaju pojavljivati makrofiti. Zabilježene su 26 vrste vodenog bilja, od toga jedna vrsta zlatnožutih algi, osam vrsta parožina, dvije vrste mahovina te 15 vrsta vaskularnih biljaka. Najčešće vrste u flori Visovačkog jezera su Myriophyllum verticillatum, Najas marina, Phragmites australis i Potamogeton perfoliatus. U vodenoj vegetaciji Visovačkog jezera mogu se razlikovati četiri glavna vegetacijska pojasa: vegetacija tršćaka (helofitska vegetacija), submerzna vegetacija s plutajućim listovima, submerzna vegetacija bez plutajućih listova i vegetacija parožina. U Visovačkom jezeru dominiraju biljke svjetla, toplih staništa, koje nepovoljne zimske uvjete preživljavaju s pupovima u vodi, koje preferiraju nutrijentima bogate supstrate i neutralni pH vode, niski salinitet, zimzelene i ljeti listajuće vrste, koje se najčešće rasprostranjuju hidrohorijom, a vegetativno se razmnožavaju podzemnim vriježama. Povećani dotok nutrijentima bogatih voda te utjecaj sidrenja predstavljaju glavne prijetnje očuvanju vegetacije Visovačkog jezera.

Abstract (english)

Visovac Lake is situated in Krka National Park and it represents the largest extension of Krka River. In july of 2018 a sampling by line transect method has been applied. Transcets were extended perpendicular to the shore up to the depth at which the macrophytes cease to appear. There have been found 26 species of aquatic plants - one species of yellow-green algae, eight species of chara, two species of moss and one species of vascular plants. The most common species in the flora of Lake Visovac are Myriophyllum verticillatum, Najas marina, Phragmites australis and Potamogeton perfoliatus. There are four main vegetation belts in the aquatic vegetation of Lake Visovac: halophytic vegetation, submerged vegetation with floating leaves, submerged vegetation without floating leaves and chara vegetation. Lake Visovac is dominated by plants of light, warm habitats which survive unfavorable living conditions with their buds in water and which prefer substrates rich in nutrients and neutral Ph value of water, low salinity, evergreen and summer flowering species that are distributed by hydrochory and reproduced by underground stems. The increased inlet of water rich in nutrients and the anchoring effect represent the main threats to the preservation of vegetation of Visovac Lake.

• Keywords: vodena vegetacija; Visovačko jezero; makrofiti
• Keywords (english): aquatic vegetation; Visovac lake; macrophyte
• Language: croatian
• URN:NBN: urn:nbn:hr:217:190905
• 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: Open access; Embargo expiration date: 2019-11-23
• Created on: 2018-12-04 11:59:57