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Effects of nanoparticles on Daphnia magna population dynamics
Authors:Didem Gökçe  Süleyman Köytepe  İmren Özcan
Affiliation:1. Department of Biology, Faculty of Arts and Science, Inonu University, Malatya, Turkeydidem.gokce@inonu.edu.trdidemgkc@gmail.com;4. Department of Chemistry, Faculty of Arts and Science, Inonu University, Malatya, Turkey
Abstract:Spherical TiO2 nanoparticles (npTiO2) were prepared by controlled hydrolysis of tetraethoxy orthotitanate under a nitrogen atmosphere. ZnO nanoparticles (npZnO) were prepared using hydrothermal methods. The crystal structure, chemical, thermal and morphological properties of npZnO and npTiO2 were characterised using Fourier Transform Infrared Spectrometer, enery-dispersive X-ray spectroscopy, X-ray diffraction, and scanning electron microscope techniques. The short- and long-term experiments were started with neonates taken from the same culture and laboratory condition. In the acute experiments, npTiO2, npZnO, and cocktail concentrations were applied. 96h-LC50 values were 1.8, 0.7, and 0.1?mg?L?1, respectively (p?2 concentrations were performed. 21d-LC50 value was 1.0?mgL?1 (p??1 npTiO2. Neonate and young individuals were more sensitive to death because of their low tolerance. This result was affected by population progeny and growth rates (p??1 npTiO2 groups were determined as growing population, 1.5 and 2?mgL?1 npTiO2 groups had decreased population size as R0 values. Consequently, the relationships between nanoparticle accumulation within Daphnia magna and its population structure and body morphometry for each concentration were important indicators. Its tolerance level to nanoparticles under laboratory conditions reflected its replacement and behaviour in the ecosystem.
Keywords:Daphnia magna  nanoparticle  population structure  titanium dioxide  zinc oxide
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