Potencijalno toksičan rod dijatomeja Pseudo-nitzschia u Jadranskom moru

undergraduate thesis

• Title (english): Potentially toxic diatoms of the genus Pseudo-nitzschia in the Adriatic sea
• Author: Mateja Gazić
• Mentor: Damir Viličić (mentor)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2009, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Dijatomeje roda Pseudo-nitzschia cvatu u uvjetima smanjene svjetlosti, kada su vrijednosti temperature niske i u širokom rasponu saliniteta. Laboratorijska istraživanja pokazala su da je produkcija domoične kiseline, aminokiseline topljive u vodi, ovisna o raspoloživosti silicija, fosfora, dušika i metala, uglavnom željeza. Međutim, nepoznata je uloga domoične kiseline u obrani organizma ni u primarnoj produkciji. Pretpostavlja se da ima ulogu u ekskreciji prekomjerne fotosintetske energije. Isto tako, nemoguće je razjasniti varijabilnost domoične kiseline među različitim vrstama roda Pseudo-nitzschia ni postojanje toksičnih i netoksičnih sojeva iste vrste. Učestalija cvatnja toksičnih dijatomeja iz roda Pseudo-nitzschia u vezi je s povećanom koncentracijom nutrijenata kao posljedicom onečišćenja morskog okoliša s kopna, kako antropogenim tako i prirodnim (pustinjski pijesak). Globalno zatopljenje također može imati utjecaja tako što produžuje period populacijskog rasta vrsta Pseudo-nitzschia i tako povećava njihovu svjetsku rasprostranjenost.

Abstract (english)

Diatoms of the genus Pseudo-nitzschia bloom under conditions of reduced luminosity when the values of temperature are low and at a wide range of salinities. The production of domoic acid, a water-soluble amino acid, depends on availability of silicon, phosphorus, nitrogen and metal, mainly iron. However, the role of domoic acid in organism protection or in primary production is not known. It is suggested that domoic acid takes part in excretion of excess photosynthetic energy. Equally, the variability in domoic acid production between different species of genus Pseudo-nitzschia or the presence of toxic and non-toxic strains of the same species cannot be explained. An increase in toxic blooms of Pseudo-nitzschia might be related to increase in nutrient availability from antropogenic pollution. Global warming may have an influence as well by lengthening the growth period for Pseudo-nitzschia enlarging their global distribution.

• Keywords: dijatomeje; Pseudo-nitzschia; Jadransko more
• Keywords (english): diatoms; Pseudo-nitzschia; Adriatic sea
• Language: croatian
• URN:NBN: urn:nbn:hr:217:958309
• Study programme: Title: Environmental Sciences; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2018-03-07 13:01:52