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Simčić, Tatjana; Brancelj, Anton

doi:10.1023/a:1003117221455

Cited by 43 publications

(5 citation statements)

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“…The levels of accumulation in AgNP-exposed daphnids observed in this study are higher than those observed by McTeer et al in 5-day exposures to 100 µg/L AgNP (polymer coated) [35]. However, Ribeiro et al observed higher accumulation of Ag in conditions similar to the present study with an uptake of ~2.7 ng Ag/daphnid (assuming a dry weight of 180 µg/daphnid; [37]) after 24 h of exposure to 5 µg/L AgNP (3-8 nm, unknown coating; [34]). From the data obtained in this study, it is difficult to conclude whether Ag was directly transferred from the solution and internalized in the organisms or simply adsorbed on the animal's surface or in its digestive tract.…”

Section: Determination Of Ag Concentration In Daphnia Magnacontrasting

confidence: 61%

Dissolution of Silver Nanoparticles in Stratified Estuarine Mesocosms and Silver Accumulation in a Simple Planktonic Freshwater Trophic Chain

Guilleux

Chen²,

Campbell

et al. 2022

Environments

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The increasing presence of nanomaterials in consumer products has led the scientific community to study the environmental fate of these contaminants of emerging concern. Silver nanoparticles, used mainly for their antibacterial properties, are among the most common nanomaterials. Understanding their transformations and interactions with living organisms, especially under environmentally relevant conditions that can modify metal bioavailability, is a crucial step in the study of their impacts on aquatic ecosystems. In the present study, citrate-coated silver nanoparticles (20 nm; 10 µg/L) were added to the surface freshwater layer of mesocosms simulating a stratified estuary. The investigation by dialysis of the nanoparticle dissolution showed that a large amount of total silver was found in the freshwater layer (and a very low amount in the seawater layer) and that 5–15% was in the form of dissolved silver. These results indicate that the halocline, separating fresh water from seawater, acted as a strong density barrier limiting the sedimentation of the nanoparticles. A simple trophic chain, composed of the freshwater alga Chlamydomonas reinhardtii and the invertebrate Daphnia magna, was used to determine silver bioavailability. This study suggests that citrate-coated silver nanoparticles do not significantly contribute to Ag accumulation by algae but may do so for invertebrates.

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Section: Determination Of Ag Concentration In Daphnia Magnacontrasting

confidence: 61%

Dissolution of Silver Nanoparticles in Stratified Estuarine Mesocosms and Silver Accumulation in a Simple Planktonic Freshwater Trophic Chain

Guilleux

Chen²,

Campbell

et al. 2022

Environments

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“…This decrease in retention efficiency in D. pulex under limitation is surprising, considering that previous work has found that, for certain genotypes, P limitation yields an increase in nutrient retention (Roy Chowdhury et al 2014). However, studies have also found that D. pulex has significantly increased electron transport chain activity compared with D. pulicaria (Simcic and Brancelj 1997). This increased activity could necessitate a comparative increase in Fe demand which when under nutrient stress could reveal patterns similar to what were found in this study where Fe retention remains the same while the acquisition rate of the element increases.…”

Section: Discussionmentioning

confidence: 84%

Interactive effects of dietary phosphorus and iron on Daphnia life history

Lind

Jeyasingh

2017

Limnology & Oceanography

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Food quality of freshwater consumers is often defined as the relative supply of carbon (C) to phosphorus (P) in diet. The growth rate hypothesis makes mechanistic links between P supply, ribosome biogenesis, and growth, with subsequent impacts on other life history traits such as age at maturity and clutch size. However, we know surprisingly little about the role and importance of other elements in impacting life histories of freshwater zooplankton. Because there is much evidence indicating a pivotal role for iron (Fe) in oogenesis, we hypothesized that dietary Fe content will invoke distinct effects on consumer life history compared to P. We tested this hypothesis in four species of Daphnia, by characterizing the relative impact of P and Fe on life history traits, and also measuring changes in Fe kinetics in response to dietary P and Fe. We found that while P had the largest influence on growth rate, Fe was particularly important in impacting reproductive traits. Radiotracer (Fe55) analyses revealed differences in the acquisition and retention rates of Fe between two species of Daphnia. Finally, we found that P‐ and Fe‐supply driven differences in growth and reproduction had significant effects on population growth. These results indicate that Fe can constrain production of freshwater zooplankton. Understanding the interaction between the supply of P in relation to trace elements should provide a clearer picture on how stoichiometric constraints are realized in lakes.

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“…D. magna has a weight ranging from ∼10 (24 h old) to 170 μg (largest adults) in terms of dry weight. 79 The organisms in this study were ∼4 weeks old with a dry weight of ∼100 μg per organism. In this study, all of the NMR spectra were recorded using 20 fully 13 C-enriched adult D. magna samples leading to only ∼2 mg of total biomass.…”

Section: Resultsmentioning

confidence: 99%

Selective Amino Acid-Only in Vivo NMR: A Powerful Tool To Follow Stress Processes

et al. 2019

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In vivo NMR of small 13 C-enriched aquatic organisms is developing as a powerful tool to detect and explain toxic stress at the biochemical level. Amino acids are a very important category of metabolites for stress detection as they are involved in the vast majority of stress response pathways. As such, they are a useful proxy for stress detection in general, which could then be a trigger for more in-depth analysis of the metabolome. 1 H– 13 C heteronuclear single quantum coherence (HSQC) is commonly used to provide additional spectral dispersion in vivo and permit metabolite assignment. While some amino acids can be assigned from HSQC, spectral overlap makes monitoring them in vivo challenging. Here, an experiment typically used to study protein structures is adapted for the selective detection of amino acids inside living Daphnia magna (water fleas). All 20 common amino acids can be selectively detected in both extracts and in vivo. By monitoring bisphenol-A exposure, the in vivo amino acid-only approach identified larger fluxes in a greater number of amino acids when compared to published works using extracts from whole organism homogenates. This suggests that amino acid-only NMR of living organisms may be a very sensitive tool in the detection of stress in vivo and is highly complementary to more traditional metabolomics-based methods. The ability of selective NMR experiments to help researchers to “look inside” living organisms and only detect specific molecules of interest is quite profound and paves the way for the future development of additional targeted experiments for in vivo research and monitoring.

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Cited by 43 publications

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Dissolution of Silver Nanoparticles in Stratified Estuarine Mesocosms and Silver Accumulation in a Simple Planktonic Freshwater Trophic Chain

Dissolution of Silver Nanoparticles in Stratified Estuarine Mesocosms and Silver Accumulation in a Simple Planktonic Freshwater Trophic Chain

Interactive effects of dietary phosphorus and iron on Daphnia life history

Selective Amino Acid-Only in Vivo NMR: A Powerful Tool To Follow Stress Processes

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