magistrsko delo
Urban Kunej (Author), Damjana Drobne (Reviewer), Anita Jemec (Mentor), Anita Jemec (Thesis defence commission member), Damjana Drobne (Thesis defence commission member), Primož Zidar (Thesis defence commission member)

Abstract

Mikroplastika (MP) so po definiciji plastični delci manjši od 5 mm, ki se vse pogosteje pojavljajo v okolju in imajo nanj lahko negativne učinke. V naravno okolje pridejo bodisi direktno preko izpustov čistilnih naprav ali pa nastanejo pri mehaničnem preoblikovanju večjih plastičnih delov. Zaradi majhnosti teh delcev obstaja veliko tveganje, da imajo na organizme negativen učinek. Do danes obstaja še veliko neznank glede potencialne biodostopnosti MP za manjše vodne nevretenčarje. Ker je večina MP lažja od vode, obstaja vprašanje, ali je le-ta sploh dostopna za organizme in kako velikost MP vpliva na biodostopnost. Glavni cilj naloge je bil ugotoviti, ali je MP velikostnega razreda od 20-1000 μm dostopna za izbrane testne organizme vodne bolhe Daphnia magna in morske rakce Artemia franciscana. Kot drugo nas je zanimalo, kakšni so učinki MP na organizme po akutni izpostavitvi. Izbrane testne organizme smo izpostavljali različnim tipom MP za 48 ur pri koncentraciji 100 mg/L. Ugotovili smo, da so testni organizmi sposobni zaužitja vseh tipov testirane MP, vendar pa MP ne vpliva na preživetje. Naši rezultati nakazujejo, da je biodostopnost MP odvisna od njihove velikosti: manjši delci so bolj biodostopni kot večji. Prav tako smo dokazali vpliv MP na velikost osebkov.

Keywords

mikroplastika;vpliv;biodostopnost;vodni raki;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [U. Kunej]
UDC: 504.5(043.2)
COBISS: 4364367 Link will open in a new window
Views: 1287
Downloads: 465
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Other data

Secondary language: English
Secondary title: Size effects of microplastic on the bioavailability in selected crustacean species
Secondary abstract: Microplastics (MP) are plastic particles ≤ 5 mm, which have become prevalent in the environment and have negative effects on it. They enter the environment either directly through discharges of sewage plants or resulting from mechanical transformation of large plastic parts. Due to their small size, they pose a risk to have negative effects on organisms. To date, there are still many unknowns regarding the potential bioavailability for small aquatic invertebrates. Since most of MP are lighter than water, we do not know whether it is accessible to all organisms and how the size of the MP affect the bioavailability. The aim of this study was to determine bioavailability and effects of the MP in size range from 20 – 1000 μm on model organisms Daphnia magna and Artemia franciscana. Selected model organisms were exposed for up to 48 hours or two weeks at concentration, 100 mg/L. Model organisms ingested all types of tested MP. However, MP does not affect the mortality. Our results show that bioavailability is related to the particle size: smaller particles were ingested more readily than larger. They also have a potential impact on the size of the organisms.
Secondary keywords: microplastic;effects;bioavailability;crustacean species;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Biotehniška fak.
Pages: X, 60, [6] f.
ID: 10850848