Simbioza u praživotinja

undergraduate thesis

• Title (english): Symbiosis in protozoa
• Author: Najla Kajtezović
• Mentor: Goran Kovačević (mentor)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2010, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Simbioza u praživotinja uglavnom predstavlja bliski mutualistički suživot između praživotinje i jednostaničnih simbionata (bakterija, cijanobakterija i/ili jednostaničnih alga) ili praživotinja i višestaničnog organizma (preživač, niži termit ili žohar koji se hrani drvetom, biljka). Dobrobit simbioze za praživotinjskog domaćina može biti: dodatna opskrba hranjivim tvarima od jednostanične alge ili cijanobakterije, zaštita od predatora i opskrba kisikom. Dobrobit simbioze za simbionte može biti: zaštita od predatora i opskrba hranjivim tvarima. Jedna praživotinja može imati i nekoliko stotina jednostaničnih simbionata. Simbioza može biti obligatna ili fakultativna, endosimbioza ili ektosimbioza. Simbioza je uobičajena u trepetljikaša i sluzavaca. Najbolje istražena simbioza je ona između trepetljikaša roda Paramecium i jednostaničnih algi roda Chlorella. Ovaj rad je kratka prezentacija uobičajenih primjera simbioze u praživotinja. Govori o nužnosti prilagodbe simbionta-domaćina i simbionta-gosta za uspostavljanje i održavanje simbioze. Važnost simbioze je u tome što omogućuje ovim organizmima zauzimanje novog mjesta u ekološkoj niši, koje je nedostupno drugim organizmima. Simbioza u praživotinja u prirodi je vrlo česta i raznolika, ali još uvijek nedovoljno istražena.

Abstract (english)

Symbiosis in protozoa mostly represents a close mutualistic association between a protozoan and unicellular symbionts (bacteria, cyanobacteria or/and unicellular algae) or protozoans and a multicellular organism (ruminants, lower termites, wood-eating cockroaches, plants). Benefits for a protozoan host can be: extra food supply from intracellular algae or cyanobacteria, protection from predation and oxygen supply. Benefits for symbionts can be: protection from predation and nutrition supply. One protozoan can bear a couple of hundreds unicellular symbionts. Symbiosis can be obligate or facultative, endosymbiosis or ectosymbiosis. It is very common in ciliate and sarcodine protozoans. The best studied symbioses are those between a ciliate protozoan of genus Paramecium and symbiotic unicellular algae of genus Chlorella. This work presents a short overview of the most common examples of symbiosis in protozoa. It shows the necessity of adaptations of symbionts and hosts for formation and maintainance of the symbiosis. Symbiosis is very important because it allows these organisms to take new place in ecological niche which is out of reach to other organisms. Symbiosis in protozoa in nature is very common and shows a great diversity, but is still not adequately investigated.

• Keywords: praživotinje; simbioza
• Keywords (english): protozoa; symbiosis
• Language: croatian
• URN:NBN: urn:nbn:hr:217:463499
• 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: 2018-03-23 13:41:18