Water Chemistry, Exposure Routes and Metal Forms Determine the Bioaccumulation Dynamics of Ag (Ionic and Nanoparticulate) in Daphnia magna

2021 ◽  
Author(s):  
Emma Lesser ◽  
Fatima Noor Sheikh ◽  
Mithun Sikder ◽  
Marie‐Noële Croteau ◽  
Natasha Franklin ◽  
...  
Keyword(s):  
Water Chemistry ◽  
Daphnia Magna ◽  
Exposure Routes

The toxicity of cadmium-copper mixtures on daphnids and microalgae analysed using the Biotic Ligand Model

2021 ◽  
Author(s):  
Bernard CLEMENT ◽  
Vincent FELIX ◽  
Valentin BERTRAND
Keyword(s):  
Growth Inhibition ◽  
Water Chemistry ◽  
Daphnia Magna ◽  
Mixture Toxicity ◽  
Pseudokirchneriella Subcapitata ◽  
Major Cations ◽  
Biotic Ligand ◽  
Accumulation Of Metals ◽  
Parameter Values ◽  
Ligand Model

Abstract For the prediction of metals mixture ecotoxicity, the BLM approach is promising since it evaluates the amount of metals accumulated on the biotic ligand on the basis of water chemistry, i.e. species (major cations) competing with metals, and related toxicity. Based on previous work by Farley et al. 2015 (MMME research project), this study aimed at modelling toxicity of Cd:Cu mixtures (0:1–1:1–1:0–1:2 − 1:3 − 2:1–3:1–4:1–5:1–6:1) to the crustacean Daphnia magna (48h immobilization tests) and the microalga Pseudokirchneriella subcapitata (72h growth inhibition tests). The USGS model was chosen, assuming additivity of effects and accumulation of metals on a single site. The assumption that EDTA could contribute to toxicity through metals complexing was also tested, and potential effects due to reduction of ions Ca2+ absorption by metals were considered. Modelling started with parameter values of Farley et al. 2015 and some of these parameters were adjusted to fit modelled data on observed data. The results show that toxicity can be correctly predicted for the microalgae and that the hypothesis of additivity is verified. For daphnids, the prediction was roughly correct, but taking into account CuEDTA led to more realistic parameter values close to that reported by Farley et al. 2015. However, It seems that, for daphnids responses, metals interact either antagonistically or synergistically depending on the Cu:Cd ratio. Furthermore, synergy could not be explained by additional effects linked to a reduction of Ca absorption since this reduction, mainly due to Cd, increased inversely to synergy. Finally, the USGS model applied to our data was able to predict Cu:Cd mixture toxicity to microalgae and daphnids, giving rise to estimated EC50s roughly reflecting EC50s calculated from observed toxicity.

scholarly journals Impact of water chemistry on the particle-specific toxicity of copper nanoparticles to Daphnia magna

2018 ◽  
Vol 610-611 ◽  
pp. 1329-1335 ◽  
Author(s):  
Yinlong Xiao ◽  
Willie J.G.M. Peijnenburg ◽  
Guangchao Chen ◽  
Martina G. Vijver
Keyword(s):  
Water Chemistry ◽  
Daphnia Magna ◽  
Copper Nanoparticles

Transcriptome profiles of Daphnia magna across to the different water chemistry of surface water of the Korean Demilitarized Zone

2017 ◽  
Vol 9 (3) ◽  
pp. 188-198 ◽  
Author(s):  
Bo-Mi Kim ◽  
So Hee Ahn ◽  
Nu Ri Choi ◽  
Jaewoo Heo ◽  
Heewon Kim ◽  
...  
Keyword(s):  
Surface Water ◽  
Water Chemistry ◽  
Daphnia Magna ◽  
Demilitarized Zone

Membrane-bound vesicles associated with the microvilli in the midgut of the freshwater microcrustacean, Daphnia magna

1983 ◽  
Vol 41 ◽  
pp. 480-481
Author(s):  
Patricia L. Jansma
Keyword(s):  
Daphnia Magna ◽  
Intestinal Epithelial Cells ◽  
Uranyl Acetate ◽  
Intestinal Epithelial ◽  
Chlamydomonas Reinhardii ◽  
Thin Sections ◽  
Saturated Water ◽  
Cacodylate Buffer ◽  
Membrane Bound ◽  
Ethanol Series

The presence of the membrane bound vesicles or blebs on the intestinal epithelial cells has been demonstrated in a variety of vertebrates such as chicks, piglets, hamsters, and humans. The only invertebrates shown to have these microvillar blebs are two species of f1ies. While investigating the digestive processes of the freshwater microcrustacean, Daphnia magna, the presence of these microvillar blebs was noticed.Daphnia magna fed in a suspension of axenically grown green alga, Chlamydomonas reinhardii for one hour were narcotized with CO2 saturated water. The intestinal tracts were excised in 2% glutaraldehyde in 0.2 M cacodyl ate buffer and then placed in fresh 2% glutaraldehyde for one hour. After rinsing in 0.1 M cacodylate buffer, the sample was postfixed in 2% OsO4, dehydrated with a graded ethanol series, infiltrated and embedded with Epon-Araldite. Thin sections were stained with uranyl acetate and Reynolds lead citrate before viewing with the Philips EM 200.

Computer Reconstruction of the Cellular Architecture of the Daphnia Magna Optic Ganglion

1975 ◽  
Vol 33 ◽  
pp. 284-285
Author(s):  
E. R. Macagno ◽  
C. Levinthal
Keyword(s):  
Daphnia Magna ◽  
Genetic Background ◽  
Compound Eye ◽  
Synaptic Connectivity ◽  
Serial Sections ◽  
Cross Sectional ◽  
Small Crustacean ◽  
Optic Ganglion ◽  
Structural Invariance ◽  
High Degree

The optic ganglion of Daphnia Magna, a small crustacean that reproduces parthenogenetically contains about three hundred neurons: 110 neurons in the Lamina or anterior region and about 190 neurons in the Medulla or posterior region. The ganglion lies in the midplane of the organism and shows a high degree of left-right symmetry in its structures. The Lamina neurons form the first projection of the visual output from 176 retinula cells in the compound eye. In order to answer questions about structural invariance under constant genetic background, we have begun to reconstruct in detail the morphology and synaptic connectivity of various neurons in this ganglion from electron micrographs of serial sections (1). The ganglion is sectioned in a dorso-ventra1 direction so as to minimize the cross-sectional area photographed in each section. This area is about 60 μm x 120 μm, and hence most of the ganglion fit in a single 70 mm micrograph at the lowest magnification (685x) available on our Zeiss EM9-S.

Mise en évidence des effets sublétaux sur des populations de daphnies (Daphnia magna)

1981 ◽  
Vol 12 (1) ◽  
pp. 63-79
Author(s):  
R. Cabridenc ◽  
Bui Thi ◽  
H. Lepailleur
Keyword(s):  
Daphnia Magna

Biological Effects of the Combined Chronic Action of 90Sr and Pb2+ on Daphnia Magna Straus

2002 ◽  
Vol 38 (4) ◽  
pp. 11
Author(s):  
M. G. Mardarevich ◽  
D. I. Gudkov ◽  
L. S. Kipnis ◽  
V. V. Belyaev
Keyword(s):  
Daphnia Magna ◽  
Biological Effects
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