Mikropaleontološke značajke morskog dna Tršćanskog zaljeva

master's thesis

• Title (english): Micropaleontological characteristics of the sea bottom sediments in the Gulf of Trieste
• Author: Ana Hlebec
• 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: 2021-01-29, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology; Geology and Paleontology

Abstract

Dvije plitke sedimentne jezgre ručno su uzorkovane u južnom dijelu Tršćanskog
zaljeva, na dubinama od 13,2 i 13,6 m. U zaljev koji je zaštićen, plitak i ima izrazito urbaniziranu
obalu (mogući izvori organskih i kemijskih zagađivača) ulijeva se više rijeka (Soča, Timava,
Rižana). 10 cm debele jezgre (KPF 1, KPF 4) podijeljene su u 2 cm debele poduzorke, koji su
tretirani Rose bengalom i iz svakog poduzorka analizirane su foraminiferske zajednice, njihov
sastav, indeksi bioraznolikosti... More (Simpsonov indeks, Shannon-Wienerov indeks, Berger-Parkerov
indeks i Fisher (α) indeks) i BFOI indeks. Zajednice sadrže kućice recentnih bentičkih
foraminifera i pretaloženih, većinom planktonskih, foraminifera. Određeno je 36 rodova i 71
vrsta recentnih foraminifera, udio obojenih/živućih kućica kao i onih koji su zahvaćene nekim
promjenama (piritizacijom, fragmentacijom ili drugim mehaničkim oštećenjima). U svim
zajednicama jezgre KPF 1 dominira rod Ammonia, a u jezgri KPF 4 u pojedinim intervalima
brojnošću se izmjenjuju rodovi Ammonia, Nonion, Anomalinoides, Valvulineria i Porosnonion.
Dominantne vrste, indeksi bioraznolikosti i BFOI indeks zajednica istraživanih jezgara ukazuju
na taloženje u plitkom morskom okolišu, normalnog saliniteta u kojem vladaju visoko do nisko
oksični uvjeti. Less

Abstract (english)

Two shallow sedimentary cores were sampled manually in the southern part of the Gulf of
Trieste, at a depth of 13.2 and 13.6 m. Several rivers (Soča, Timava, Rižana) flow into a
sheltered and shallow bay, with highly urbanized coastline (possible sources of organic and
chemical contaminants). 10 cm long sediment cores (KPF 1, KPF 4) were divided into 2 cm
thick subsamples and treated with Rose Bengal. Composition, biodiversity indices (Simpson
index, Shannon-Wiener index,... More Berger-Parker index and Fisher (α) index) and BFOI index were
calculated for foraminiferal assemblages from each sample. The assemblages contain recent and
reworked (mostly planktonic) foraminiferal tests. A total of 36 genera and 71 species were
identified, with the proportion of stained/living tests and those affected by some diagenetic
changes (due to pyritization, fragmentation). Genus Ammonia is dominant in all the assemblages
of core KPF 1, but in core KPF 4 there is a change in the dominance of genera Ammonia, Nonion,
Anomalinoides, Valvulineria and Porosononion at different intervals. Dominant species,
biodiversity indices, and BFOI index of the studied assemblages indicate shallow marine
environment with normal salinity where high to low oxic conditions prevail. Less

• Keywords: Bentičke foraminifere; Tršćanski zaljev; sedimentne jezgre; bioraznolikost
• Keywords (english): Benthic foraminifera; Gulf of Trieste; sedimentary cores; biodiversity
• Language: croatian
• URN:NBN: urn:nbn:hr:217:897145
• Study programme: Title: Graduate university study of Geology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra geologije (magistar/magistra geologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-04-20 11:37:14