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Bibliographic record number: 710705

Journal

Authors: Lyons, Daniel Mark; Burić, Petra; Pfannkuchen, Martin Andreas; Godrijan, Jelena; Gilliland, Douglas; Jakšić, Željko.
Title: Trophic transfer and biomagnifications of nanoparticles on transition from freshwater to marine environment
Source: 7. International Nanotoxicology Congress - Nanotox 2014, Programme & Abstracts Book / Fadeel B., Kagan V. i Karakaya A.E. (ed). - Antalya :
Meeting: 7. International Nanotoxicology Congress - Nanotox 2014
Location and date: Antalja, Turska, 23. - 26. 04. 2014.
Keywords: nanoparticle; trophic transfer; food web; marine; protozoa
Abstract:
Over the past decade there has been a dramatic increase in number of applications of nanoparticles in consumer products, particularly cosmetics, food and clothes. However, with the increasing use of nanoparticles and the growing quantities that are reaching the environment, the potential for negative impacts on living organisms is significant. Indeed toxicity of nanoparticles towards a broad range of organisms, particularly in freshwater environments, has already been shown although the mechanism of action is still a source of some controversy. In addition to direct toxicity of nanoparticles towards various organisms the potential for those nanoparticles to enter and move through the food change is only just beginning to be realised. Thus, the accumulation and persistence of nanoparticles in biota may have important consequences for humans. As nanoparticles may remain relatively unagglomerated in freshwater, recent investigations have begun to look at the movement of nanoparticles between freshwater organisms in simplified food webs. In contrast, there is an extreme lack of data for the corresponding processes in high salt content media such brackish and marine waters, possibly due to the expectation of rapid agglomeration and aggregation of nanoparticles in these high ionic strength media. However, with more than half the global population living in coastal regions and a high proportion of industry also located in those areas, the fate of nanoparticles in brackish and saltwater environments may be extremely important. In this direction, we report herein an investigation of the behaviour of putatively non-toxic fluorescent silica nanoparticles in freshwater and saltwater media and their fate with respect to uptake by living organisms. Nanoparticles were sequestered in freshwater by E. coli bacteria which, when introduced into marine water, subsequently acted as an efficient vector for the trophic transfer of those nanoparticles to ciliated protozoa. In contrast, there was essentially no direct nanoparticle uptake by these specific protozoa in the absence of bacteria. In addition, these silica nanoparticles were found to significantly suppress growth rates of protozoa, indicating that assumptions of non-toxicity of silica nanoparticles may be misplaced. Ultimately, this work has implications for understanding the transfer of nanoparticles from fresh- to saltwater systems, i.e. from industrial effluents or public water systems into the marine environment, the movement of nanoparticles in the environment from lower to higher trophic levels and nanoparticles persistence and potential biomagnification in the food web.
Type of meeting: Poster
Type of presentation in a journal: Abstract
Type of peer-review: International peer-review
Project / theme: HRZZ-02.05/17
Original language: ENG
Category: Ostalo
Research fields:
Geology
Contrib. to CROSBI by: Željko Jakšić (Zeljko.Jaksic@irb.hr), 21. Kol. 2014. u 17:32 sati



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