Mramorni rak kao modelni organizam za istraživanje utjecaja organskih zagađivala na slatkovodne beskralježnjake

undergraduate thesis

• Title (english): Marble crayfish as a model organism for examining the impacts of organic pollutants on freshwater invertebrates
• Author: Anita Tarandek
• Mentor: Sandra Hudina (mentor)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2020, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Zagađenje slatkovodnih ekosustava predstavlja veliki problem diljem svijeta. Herbicidi i isekticidi česti su zagađivači u površinskim i podzemnim vodama, stoga predstavljaju veliki rizik za neciljanje organizme poput rakova. Tri odvojena eksperimenta proučavala su učinke prometrina, cipermetrina i metazaklora i njegovog metabolita metazaklora OA na mramornom raku Procambarus virginalis. Kronično izlaganje rakova prometrinu utjecalo je na mortalitet, stopu rasta i histologiju. Neke su promjene primjećene kod većih koncentracija, ali histopatološke promjene škrga primjećene su i kod rakova izloženih okolišnim koncentracijama. Nadalje, izlaganje rakova cipermetrinu ukazalo je da cipermetrin izaziva oksidativni stres i poremećaje antioksidativnih sustava rakova. Konačno, uočene su razlike u mortalitetu, stopi rasta, ponašanju, kao i promjene u tkivu škrga nakon izlaganja rakova okolišnim koncentracijama metazaklora i njegovog metabolita metazaklora OA. Zaključno, sve studije ukazale su na negativne učinke organskih zagađivala na rakove.

Abstract (english)

Pollution of freshwater ecosystems is a serious problem worldwide. Herbicides and insecticides are frequent pollutants in surface and groundwaters and they propose a major risk to non-target organisms, such as crayfish. The three separate experiments studied the effects of prometryne, cypermethrin and metazachlor and its metabolite metazachlor OA, respectively, on the marbled crayfish Procambarus virginalis. Chronic exposure of prometryne on early life stages of crayfish has affected their mortality, growth rate, and histology. Some of the changes were observed only at higher exposures, but histopathological changes in gills were observed also in crayfish exposed to environmental concentrations. Furthermore exposure of cypermethrin suggested that cypermethrin causes oxidative stress and also disruption of antioxidant systems in crayfish. Lastly, differences in mortality, growth, behaviour, as well as minimal alterations in gill tissue were observed following exposure to environmentally relevant concentrations of metazachlor and metazachlor OA. In conclusion, all studies suggested that organic pollutants have a negative effect on the marbled crayfish.

• Keywords: slatkovodni ekosustavi; zagađenje
• Language: croatian
• URN:NBN: urn:nbn:hr:217:944324
• Study programme: Title: Ecology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) biologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) biologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-09-21 13:08:28