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Acute Adverse Effects of Metallic Nanomaterials on Cardiac and Behavioral Changes in Daphnia magna
| Content Provider | MDPI |
|---|---|
| Author | Park, Jihoon Park, Changgyun Lee, Yongoh Ryu, Changseon Park, Jayoung Kim, Youngjun |
| Copyright Year | 2022 |
| Description | Nanomaterials are widely believed to induce toxic effects on organisms by evoking oxidative stress. We evaluated the toxic effects of nanomaterials on the cardiac and behavioral changes in Daphnia magna under varying exposure conditions. Titanium dioxide nanoparticles $(TiO_{2}$ NPs), silver nanoparticles (AgNPs), and silver nitrate $(AgNO_{3}$) were selected for the acute toxicity tests. The adverse effects of the substances on the neonates including heart rate, swimming speed, and oxidative stress were measured. The heart rate level decreased as the concentration of both NPs and silver ions $(Ag^{+}$) increased. The average swimming speed was measured to be approximately 15 mm/min for the control group. The swimming speed generally increased with a longer exposure to both NPs although it reached a plateau at the lowest concentration of AgNPs. A similar but less clear trend was observed for $Ag^{+}$. For all substances, the overall swimming speed exhibited no correlation or weak negative correlations with the exposure concentration. The oxidative stress levels increased after exposure compared with the control group. We conclude that aquatic nanotoxicity tests should consider multilevel physicochemical, physiological, and behavioral parameters for the official guidelines to quantify more robust adverse outcomes. |
| Starting Page | 26 |
| e-ISSN | 20763298 |
| DOI | 10.3390/environments9020026 |
| Journal | Environments |
| Issue Number | 2 |
| Volume Number | 9 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-02-10 |
| Access Restriction | Open |
| Subject Keyword | Environments Environmental Engineering Nanoparticle Toxicity Water Flea Heart Rate Swimming Speed Oxidative Stress |
| Content Type | Text |
| Resource Type | Article |
