Sastav i raznolikost foraminiferske zajednice iz sedimenta uz podmorske izvore (Savudrijska vala)

undergraduate thesis

• Title (english): Composition and diversity of foraminiferal assemblages from sediments near a submarine spring (Savudrija Bay)
• Author: Mihovil Rakarić
• Mentor: Vlasta Ćosović (mentor)
• Committee member: Vlasta Ćosović (predsjednik povjerenstva)
• Committee member: Đurđica Pezelj (član povjerenstva)
• Committee member: Nenad Tomašić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2022-09-19, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology; Geology and Paleontology

Abstract

U ovom završnom radu opisano je do koje mjere odabir frakcije sita utječe na
rezultate istraživanja sastava zajednice malih bentičkih foraminifera. U tu svrhu površinski
uzorak sedimenta prikupljen u Koparskom zaljevu (Savudrijska vala) na dubini od 24.6 m
je analiziran. Uzorak je obojen organskim bojilom Rose Bengal i ostavljen 14 dana, kako
bi se živuće jedinke foraminifera mogle razlikovati od praznih kućica. Nakon mokrog i
suhog sijanja, analiziran je udio obojenih kućica u ukupnoj zajednici, kao i zastupljenost
predstavnika tri tipa stijenki kućica (tri podreda) u frakcijama >63 μm i >125 μm. Udio
predstavnika tri podreda kao i udio obojenih jedinki rezultirao je jako sličnim
vrijednostima. Ova istraživanja sugeriraju frakciju >125 μm kao zadovoljavajuću kod
praćenja promjena sastava organizama u okolišima plitkog šelfa Jadranskog mora.

Abstract (english)

In this thesis, it is described how the selection of the sieve fraction affects the
results of the study of the composition of the smaller benthic foraminifera assemblages.
For this purpose, a surface sample of sediment collected in the Bay of Kopar (Savudria
Bay) at a depth of 24.6 m was analyzed. The sample was stained with Rose Bengal and left
for 14 days, so that living individuals of foraminifera could be distinguished from empty
shells. After wet and dry sieving, the proportion of stained tests in the total assemblage was
analysed, as well as the proportion of representatives of three types of walls (three
suborders) in fractions >63 μm and >125 μm. The proportion of representatives of the three
suborders as well as the proportion of stained individuals resulted in very similar values.
These studies suggest the >125 μm fraction as satisfactory for monitoring changes in the
composition of organisms in the environment of the shallow shelf of the Adriatic Sea.

• Keywords: male bentičke foraminifere; Jadransko more; biomonitoring; veličina fotraminifera
• Keywords (english): smaller benthic foraminifera; Adriatic Sea; biomonitoring; foraminifera size
• Language: croatian
• URN:NBN: urn:nbn:hr:217:797149
• Study programme: Title: Undergraduate university study of Geology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) geologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) geologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-01-13 12:50:11