Distribucija i tafonomske karakteristike bentičkih foraminifera u međuplimskoj zoni (muljna ravnica) Kraljičine plaže u Ninu

master's thesis

• Title (english): Distribution and taphonomy of benthic foraminifera from intertidal zone (mud plain) near Queen's Beach (Nin)
• Author: Marina Čančar
• Mentor: Vlasta Ćosović (mentor)
• Mentor: Igor Felja (komentor)
• Committee member: Vlasta Ćosović (predsjednik povjerenstva)
• Committee member: Igor Felja (član povjerenstva)
• Committee member: Nenad Tomašić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2020-11-13, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology; Geology and Paleontology

Abstract

Mikropaleontološka i granulometrijska analiza provedena je na uzorcima sedimenta iz rubnih morskih okoliša: močvare, plimne ravnice te lagune i plitkog mora u Ninskom zaljevu, neposredno uz Kraljičinu plažu. Praktični dio obuhvatio je terenske, laboratorijske i kabinetske metode. Obrađeni su površinski (0-2 cm), a iz četiri jezgre i najdublji (8-10 cm) intervali sedimenta. U svim (pod-)uzorcima određena je apsolutna i relativna brojnost foraminifera, sastav i tafonomske karakteristike foraminiferske zajednice te ekološki indeksi, što je povezano s određenim granulometrijskim karakteristikama sedimenta. Određeno je ukupno 30 rodova i 44 vrste bentičkih foraminifera, najzastupljenije su one s perforatnom stijenkom iz reda Rotaliida, najbrojniji rod je Ammonia, a najbrojnija vrsta Ammonia beccarii (Linnaeus). Vrijednosti ekoloških indeksa prilično su ujednačene i upućuju na relativno visoku raznolikosti zajednica, te na marinski okoliš normalnog do promjenjivog saliniteta. Sastav sedimenta odgovara pijesku, a najzastupljenije tafonomske promjene povezane su s transportom čestica, što je vidljivo po mehaničkom oštećenju i abradiranosti kućica foraminifera.

Abstract (english)

Micropaleontological and granulometric analyses were performed on sediment samples from the marginal marine environments: salt marsh, intertidal zone, lagoon and shallow water at Nin Bay, next to Queen’s Beach. The practical part included field, laboratory and cabinet methods. Surface (0-2 cm) sediments of all (sub-)samples and the deepest (8-10 cm) sediment intervals of the four cores were analysed. In all (sub-)samples, the absolute and relative abundance, taxonomy and taphonomy of the foraminiferal assemblage were determined and ecological (biodiversity) indices were calculated. These were correlated with certain granulometric characteristics of the sediment. A total of 30 genera and 44 species of benthic foraminifera were identified. The most common are those with perforated wall from the order Rotaliida, with Ammonia beccarii (Linnaeus) being the most common species. The values of the ecological indices are fairly uniform, indicating a relatively high diversity of the assemblage and suggesting a marine environment with normal to variable salinity. The sediments are sands, and the most common taphonomic changes are associated with the transport of particles, as evidenced by the mechanical damages and abrasion marks of the foraminiferal tests.

• Keywords: rubni morski okoliši; Ammonia beccarii; tafonomske karakteristike; pijesak
• Keywords (english): marginal marine environments; Ammonia beccarii; taphonomy; sand
• Language: croatian
• URN:NBN: urn:nbn:hr:217:665501
• 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: 2021-03-02 09:35:40