Effects of nanoparticles on Daphnia magna population dynamics. Issue 4 (21st April 2018)

• Record Type: Journal Article
• Authors: Gökçe, Didem; Köytepe, Süleyman; Özcan, İmren
• Is Part Of: Chemistry and ecology. Volume 34:Issue 4(2018)
• Page Start: 301
• Page End: 323
• Publication Date: 2018-04-21
• Subjects: Daphnia magna -- nanoparticle -- population structure -- titanium dioxide -- zinc oxide; Pollution -- Environmental aspects -- Periodicals; Ecology -- Periodicals; 577.2
• DOI: 10.1080/02757540.2018.1429418
• Languages: English
• ISSNs: 0275-7540

Abstract

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 < .05). For the chronic experiments, different npTiO2 concentrations were performed. 21d-LC50 value was 1.0 mgL −1 ( p < .05). Morphometry became progressively worse in concentrations of more than 1 mgL −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 < .05). While control and 0.5 mgL −1 npTiO2 groups were determined as growing population, 1.5 and 2 mgL −1 npTiO2 groups had decreased population size as R 0 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.