Utjecaj hidromorfoloških promjena na zajednice makrozoobentosa rijeke Bednje

master's thesis

• Author: Sandra Hodić
• Mentor: Zlatko Mihaljević (mentor)
• Committee member: Zlatko Mihaljević (predsjednik povjerenstva)
• Committee member: Danijel Orešić (član povjerenstva)
• Committee member: Alan Moro (član povjerenstva)
• Committee member: Sandra Radić Brkanac (član povjerenstva)
• Committee member: Neven Bočić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2017-02-23, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Fizička degradacija rijeka putem antropogenih pritisaka odraţava se na zajednice makrozoobentosa koje se koriste u ocjeni ekološkog stanja tekućica. Cilj ovog istraţivanja bio je odrediti i usporediti sastav i strukturu zajednice makrozoobentosa rijeke Bednje na degradiranoj lokaciji 1 promijenjene hidromorfologije i prirodnoj (referentnoj) lokaciji 2. Jedan od ciljeva bio je i utvrditi i usporediti sastav funkcionalnih hranidbenih skupina izmeĎu istraţivanih lokacija. Istraţivanje je provedeno uzorkovanjem makrozoobentosa, ocjenjivanjem hidromorfološkog stanja i mjerenjem fizikalno - kemijskih parametara vode na istraţivanim lokacijama udaljenim 500 m. Mjerenja fizikalno - kemijskih parametara vode nisu pokazala značajne razlike izmeĎu lokacija. Terenskom procjenom lokaciji 1 je pridruţena ocjena 3 ili umjereno hidromorfološko stanje (teţnja k ocjeni 4), a lokaciji 2 ocjena 2 ili dobro hidromorfološko stanje. Na degradiranoj lokaciji 1 brojnošću su prevladavale eurivalentne vrste iz skupina Diptera (Chironomidae), Oligochaeta i Amphipoda koje preferiraju finiji supstrat i fital. Veća raznolikost osjetljivih vrsta, naročito Ephemeroptera, Trichoptera i Coleoptera zabiljeţena je na valutičasto – šljunkovitim mikrostaništima lokacije 2. Najbrojnija funkcionalna hranidbena grupa bili su detritivori ili sakupljači, kojih je bilo nešto više na lokaciji 1. Sukladno raznolikosti mikrostaništa i raspoloţivoj hrani na lokaciji 1 je bilo više procjeĎivača i predatora, a na lokaciji 2 više usitnjivača i strugača.

Abstract (english)

Physical degradation of rivers through anthropogenic pressures reflects on the benthic macroinvertebrates that are used in ecological assessment of rivers. The aim of this study was to determine and compare the composition and structure of macroinvertebrates in Bednja river in degraded site 1 with changed hydromorphology and in natural (referent) site 2. One of the aims was to determine and compare the composition of functional feeding groups between the studied locations. The study was conducted by sampling macroinvertebrates, assessing the hydromorphological condition and measuring the physico - chemical parameters in the studied locations distant 500 m. The measurements of physico - chemical parameters showed no marked differences between locations. Field evaluation of site 1 is associated with grade 3 or moderate hydromorphological state (tendency to grade 4), and the site 2 with grade 2 or good hydromorphological status. On degraded site 1 abundance prevailing eurivalent species of group Diptera (Chironomidae), Oligochaeta and Amphipoda preferred finer substrate and phytal. Increased biodiversity of sensitive species, especially Ephemeroptera, Trichoptera and Coleoptera was recorded at the site 2 with pebble - gravel microhabitats. The most abundant functional feeding groups were collectors, which were more abundant at site 1. In accordance with the diversity of microhabitats and food availability, more filterers and predators were found on site 1 and the site 2 had more shredders and scrapers.

• Keywords: fizikalno - kemijska obiljeţja vode; degradacija staništa; sastav i struktura zajednice; mikrostaništa; funkcionalne hranidbene skupine
• Keywords (english): physico-chemical parameters; habitat degradation; community composition and structure; microhabitats; functional feeding guilds
• Language: croatian
• URN:NBN: urn:nbn:hr:217:577069
• 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: Open access
• Created on: 2017-04-20 12:02:21