A mixture of environmental organic contaminants in lake sediments affects hatching from<i>Daphnia</i>resting eggs

Möst, Markus; Chiaia‐Hernández, Aurea C.; Frey, Martin; Hollender, Juliane; Spaak, Piet

doi:10.1002/etc.2808

Cited by 15 publications

(9 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Because these eggs are immobile, and only require a steady flow of oxygenated water to survive, they are a perfect candidate for this single pump flow cell system. Resting eggs are of considerable importance as they exhibit different responses to toxins compared with adults and juveniles . Resting egg banks are critical to a species survival, and if they are compromised by a toxin, it can potentially lead to an ecosystem collapse, especially if the organism is a keystone species like Daphnia , connecting the producers (plants) to the consumers (higher animals) in the food web.…”

Section: Flow Cell Designmentioning

confidence: 99%

Flow‐based in vivo NMR spectroscopy of small aquatic organisms

Soong

Mobarhan

Tabatabaei

et al. 2019

Magnetic Reson in Chemistry

View full text Add to dashboard Cite

NMR applied to living organisms is arguably the ultimate tool for understanding environmental stress responses and can provide desperately needed information on toxic mechanisms, synergistic effects, sublethal impacts, recovery, and biotransformation of xenobiotics. To perform in vivo NMR spectroscopy, a flow cell system is required to deliver oxygen and food to the organisms while maintaining optimal line shape for NMR spectroscopy. In this tutorial, two such flow cell systems and their constructions are discussed: (a) a single pump high‐volume flow cell design is simple to build and ideal for organisms that do not require feeding (i.e., eggs) and (b) a more advanced low‐volume double pump flow cell design that permits feeding, maintains optimal water height for water suppression, improves locking and shimming, and uses only a small recirculating volume, thus reducing the amount of xenobiotic required for testing. In addition, key experimental aspects including isotopic enrichment, water suppression, and 2D experiments for both 13C enriched and natural abundance organisms are discussed.

show abstract

Section: Flow Cell Designmentioning

confidence: 99%

Flow‐based in vivo NMR spectroscopy of small aquatic organisms

Soong

Mobarhan

Tabatabaei

et al. 2019

Magnetic Reson in Chemistry

View full text Add to dashboard Cite

show abstract

“…D. magna fulfils a central role within the ecosystem as they consume phytoplankton, which are responsible for forming organic compounds from dissolved organic carbon dioxide to maintain the aquatic ecosystem as well as being prey for several types of invertebrates . D. magna also undergoes asexual (parthanogenetic) reproduction when in ideal environmental conditions, which ensures the offspring are genetically identical, ultimately decreasing variation in experimental studies, but also providing a strong indication of the presence of pollution when the exposed organisms produce male offspring and resting eggs . Several studies pertaining to the toxicology of chemicals and NMs have used D. magna as the indicator species due to the variety of end‐points that can be measured when exposed to a stimulus, including heart rate, appendage movement, brood number release, male neonate production, ROS formation, morphological deformation, spin rate, and moulting pattern .…”

Section: Introductionmentioning

confidence: 99%

Nanomaterials in the Environment Acquire an “Eco‐Corona” Impacting their Toxicity to Daphnia Magna—a Call for Updating Toxicity Testing Policies

2019

View full text Add to dashboard Cite

Nanomaterials (NMs) are particles with at least one dimension between 1 and 100 nm and a large surface area to volume ratio, providing them with exceptional qualities that are exploited in a variety of industrial fields. Deposition of NMs into environmental waters during or after use leads to the adsorption of an ecological (eco-) corona, whereby a layer of natural biomolecules coats the NM changing its stability, identity and ultimately toxicity. The eco-corona is not currently incorporated into ecotoxicity tests, although it has been shown to alter the interactions of NMs with organisms such as Daphnia magna (D. magna). Here, the literature on environmental biomolecule interactions with NMs is synthesized and a framework for understanding the eco-corona composition and its role in modulating NMs ecotoxicity is presented, utilizing D. magna as a model. The importance of including biomolecules as part of the current international efforts to update the standard testing protocols for NMs, is highlighted. Facilitating the formation of an eco-corona prior to NMs ecotoxicity testing will ensure that signaling pathways perturbed by the NMs are real rather than being associated with the damage arising from reactive NM surfaces "acquiring" a corona by pulling biomolecules from the organism's surface.novel and unique qualities that are not traditionally exhibited by bulk material of the same composition. NMs have been at the core of novel research for two decades and are incorporated into products spanning a range of industrial fields. For example, NMs properties are exploited in cancer research, such as the utilization of surface plasmon resonance properties of gold (Au) NMs; here the NMs are conjugated to antibodies complementary to antigens on cancer cells and are thereby internalized, following which oscillation of the Au electron cloud at a specific wavelength of light converts the absorbed light into localized heat to specifically destroy cancer cells. [1] Another example is exploitation of the antimicrobial properties of silver (Ag) NMs which undergo high dissolution to release Ag + ions [2] and where the dissolution site, rate (and thus toxicity) can be adjusted depending on the surface coating. [3] Considering that NMs are becoming so widely used, their release into the environment is inevitable. Despite this, considerably less research has focused on the implications of NMs on environmental organisms, especially under realistic conditions, than on development of their applications. NMs may enter freshwater systems from industrial effluent, where, for example, the concentrations of zinc oxide (ZnO) NMs, widely used in sunscreens and paints, in river waters has been found to be as high as 150 ng L −1 , [4] while gold (Au) NMs excreted following use in medical applications into surface waters have been predicted to be 470 pg L −1 [5] With deposition of NMs into environmental waters increasing, concerns regarding the potential for toxicity posed by NMs have demanded action, although the standard testing approaches h...

show abstract

“…Our results highlight the complex nature of formulated herbicides Bratt ® and Roundup ® in potentially suppressing the emergence of some taxa likely to be influenced by products tested, or by favouring the emergence of taxa unaffected by the products tested (Navis et al, 2013;M€ ost et al, 2015). However, this study focused on assessing the overall effects of each formulated herbicides, and of combined mixtures, within the context of an ecological community in the first instance, and did not attempt to disentangle the mechanisms underlying how these formulated herbicides affect species-specific emergence.…”

Section: Effects Of Formulated Herbicides On Emergence Of Dormant Zoomentioning

confidence: 76%

Mixture of commercial herbicides based on 2,4-D and glyphosate mixture can suppress the emergence of zooplankton from sediments

et al. 2018

View full text Add to dashboard Cite

It is generally assumed that zooplankton can recolonize lakes that have been exposed to pesticides, via their dormant egg banks. Hitherto, few studies have evaluated the relative importance of dormant egg bank recruitment in the re-establishment of zooplankton communities in the presence of pesticide. This study investigated the effects of commercial products Bratt (a.i. 2,4-D), Roundup (a.i. glyphosate) and their mixture on the emergence (abundance and taxon richness) of dormant zooplankton egg banks from natural lake sediment. Sediment samples were collected from the surface sediment (<10 cm depth) in four lakes in Southeast São Paulo, Brazil. We performed a hatching experiment, in which natural lake sediments containing dormant eggs were exposed separately to Bratt (applied concentrations ranging from 0.30 to 20 mg L), Roundup (0.28-8.5 mg L), and combined mixtures of all concentrations, plus one control (non-exposure to formulated herbicides) for a period of 28 days. All tested concentrations of Bratt, Roundup and their mixture reduced the abundance and taxon richness of emerging zooplankton (except 2 mg L of Bratt). This effect was more pronounced in rotifers. In comparison, there were no negative effects on the emergence of microcrustaceans. These findings suggest that commercial products Bratt, Roundup and their mixture can suppress the emergence of rotifers, thereby influencing zooplankton recruitment potential in lakes impacted by the presence of these commercial herbicides. Our results stress the importance of the need for additional studies to assess the effects of pesticides on dormant egg banks.

show abstract

A mixture of environmental organic contaminants in lake sediments affects hatching fromDaphniaresting eggs

Cited by 15 publications

References 52 publications

Flow‐based in vivo NMR spectroscopy of small aquatic organisms

Flow‐based in vivo NMR spectroscopy of small aquatic organisms

Nanomaterials in the Environment Acquire an “Eco‐Corona” Impacting their Toxicity to Daphnia Magna—a Call for Updating Toxicity Testing Policies

Mixture of commercial herbicides based on 2,4-D and glyphosate mixture can suppress the emergence of zooplankton from sediments

Contact Info

Product

Resources

About