Taksonomski sastav i ekologija zajednice planktonskih dijatomeja u Južnojadranskoj kotlini

master's thesis

• Title (english): Taxonomical composition and ecology of the planktonic diatom community in the South Adriatic Pit
• Author: Silvija Galović
• Mentor: Sunčica Bosak (mentor)
• Committee member: Sunčica Bosak (predsjednik povjerenstva)
• Committee member: Ines Radanović (član povjerenstva)
• Committee member: Marijana Đaković (član povjerenstva)
• Committee member: Vesna Petrović Peroković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2017-07-10, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Dijatomeje (alge kremenjašice) su jednostanični eukariotski fotosintetski mikroorganizmi koje nalazimo u svim kopnenim, slatkovodnim i morskim ekosustavima. Dominiraju brojnošću i biomasom u većini obalnih mora te su uz dinoflagelate i kokolitoforide glavna sastavnica morskog fitoplanktona. Glavni ciljevi ovog istraživanja su bili: (i) odrediti taksonomski sastav, brojnost te prostornu raspodjelu fitoplanktona u Južnojadranskoj kotlini u razdoblju kasne zime, (ii) opisati dominantne vrste dijatomeja prisutne u istraživanom razdoblju, (iii) utvrditi utjecaj fizikalno-kemijskih čimbenika koji uvjetuju sastav i prostornu distribuciju vrsta i dijatomejskih zajednica. Istraživanje je provedeno u Južnojadranskoj kotlini u razdoblju od 8. do 10. ožujka 2016. godine na 8 postaja. Uzorci su sakupljeni pomoću planktonske mreže i Niskinovog crpca te fiksirani i analizirani pomoću Zeiss Axiovert 200 invertnog mikroskopa kako bi se dobili podaci o brojnosti i taksonomskoj pripadnosti pojedinih vrsta/rodova točnije zajednice planktonskih dijatomeja. Tijekom ovog istraživanja određeno je 126 svojti fitoplanktona, pri čemu dominiraju dijatomeje s 98 morfotipova. Rezultati su pokazali da postoje razlike u zajednicama dijatomeja između uzorkovanih postaja s obzirom na udaljenost od kopna. Različitim vrstama dijatomeja odgovaraju različiti ekološki uvjeti u vodenom stupcu, prvenstveno koncentracija nutrijenata, što se odražava na njihovu prostornu distribuciju.

Abstract (english)

Diatoms are unicellular, eukaryotic, photosynthetic microorganisms found in terrestrial, freshwater and marine ecosystems. Diatoms are the most abundant group in the coastal ecosystems and together with dinoflagellates and coccolithophores compose marine phytoplankton. The main objectives of this thesis were: (i) to investigate the taxonomical composition, abundances and distribution of phytoplankton in South Adriatic Pit in winter, (ii) to describe the dominant diatom species (iii) to determine the influence of physico-chemical parameters on the spatial distribution and composition of the planktonic diatom community . The study was conducted in South Adriatic in period from 8 to 10 March 2016 at 8 stations. Samples were collected using plankton nets and Niskin samplers and analyzed using Zeiss Axiovert 200 inverted microscope in order to obtain data on the identity and abundances of phytoplankton species and planktonic diatom community. The study found 126 different phytoplankton species-of which dominated diatoms with 98 morphotypes. The results showed that there are differences between the diatom community composition among different stations based on their distance from the shore. Different diatom species showed preferences toward different environmental conditions primarily towards the nutrient concentrations that was reflected in their spatial distribution.

• Keywords: dijatomeje; južni Jadran; fitoplankton; taksonomija; ekologija
• Keywords (english): diatoms; southern Adriatic; phytoplankton; taxonomy; ecology
• Language: croatian
• URN:NBN: urn:nbn:hr:217:574247
• Study programme: Title: Integrated undergraduate and graduate university study of Biology and Chemistry Education; specializations in: Integrated undergraduate and graduate university study of Biology and Chemistry Education; Course: Integrated undergraduate and graduate university study of Biology and Chemistry Education; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: magistar/magistra edukacije biologije i kemije (magistar/magistra edukacije biologije i kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-09-07 09:16:18