Učinak presušivanja na zajednice vodenih beskralježnjaka hiporeičke zone izvorišnog toka Rječine

master's thesis

• Title (english): Effects of drying on aquatic invertebrate assemblages in the springbrook hyporheic zone of the Rječina River
• Author: Patrik Glavan
• Mentor: Sanja Gottstein (mentor)
• Committee member: Sanja Gottstein (predsjednik povjerenstva)
• Committee member: Ivan Čanjevac (član povjerenstva)
• Committee member: Mirela Sertić Perić (član povjerenstva)
• Committee member: Karmen Fio Firi (član povjerenstva)
• Committee member: Alan Moro (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2022-09-29, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Hiporeička zona spada među najugroženije vodene ekosustave u svijetu. Usprkos tome, hiporeička
zona vodotoka koji presušuju započela se istraživati tek nedavno. Prikupljeni su uzorci vodenih
beskralježnjaka hiporeičke zone izvorišnog toka rijeke Rječine u Republici Hrvatskoj kako bi se
utvrdile sezonske razlike u brojnosti, sastavu i raznolikosti hiporeosa s obzirom na fizikalnokemijske i hidrološke uvjete u vodotoku. Uzorci su prikupljeni Bou-Rouch pumpom, a voda je
profiltrirana kroz mrežicu promjera oka 100 μm čime je definirana minimalna veličina prikupljene
faune (mikro- do meiofauna) koja je pohranjena u 96 %-tnom etanolu te specijalističkim
ključevima pod laboratorijskom stereo lupom determinirana do najniže moguće sistematske razine.
Presušivanje korita uzrokovalo je povišenje temperature vode u HZ te više vrijednosti organske
tvari. Raznolikost hiporeosa najviša je tijekom ljeta kada je vodotok presušio, a najniža tijekom
zime kada su vrijednosti protoka bile visoke do ekstremne. Veća je sličnost hiporeosa između zime
i ranog proljeća te ljeta i rane jeseni s vrijednostima od 40 % do 60 % te odvojenim klasterima
sezona tijekom kojih vodotok presušuje.

Abstract (english)

The hyporheic zone is among the most endangered water ecosystems in the world. Nevertheless,
researches of the hyporheic zone of intermittent streams started just recently. Samples of aquatic
invertebrates of the springbrook hyporheic zone of the karst river Rječina in the Republic of Croatia
were collected in order to determine seasonal differences in their abundance, composition and
diversity with regard to the physiochemical and hydrologic conditions in the stream. A Bou-Rouch
pump was used for sampling, and the water was filtered through a mesh with a hole diameter of
100 μm defining the minimum size of the collected fauna (micro- to meiofauna), which was stored
in 96 % ethanol and later determined to the lowest possible systematic level under a laboratory
stereo microscope using specialist keys. Drying of the riverbed led to an increase in the temperature
of the water in the hyporheic zone and a higher organic matter content. The diversity of hyporheos
is highest during summer when the watercourse dries up, and lowest during winter when discharge
values are high to extreme. There is a greater similarity of hyporheos between winter and early
spring and between summer and early autumn with values from 40 % to 60 % and separate clusters
of seasons during which the watercourse dries up.

• Keywords: hiporeička zona; hiporeos; vodotok koji presušuje; krš; protok
• Keywords (english): hyporheic zone; hyporheos; intermittent stream; karst; discharge
• Language: croatian
• URN:NBN: urn:nbn:hr:217:466849
• Study programme: Title: Enviromental Sciences; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra struke znanosti o okolišu (magistar/magistra struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2024-09-29
• Created on: 2022-10-25 12:22:57