Effects of TiO₂ nanoparticles on the life‐table parameters, antioxidant indices, and swimming speed of the freshwater rotifer Brachionus calyciflorus

Abstract

Titanium dioxide nanoparticles (nTiO2) have raised environmental concerns and display potential hazards to aquatic organisms and even humans. However, only a few reports tested the toxicity of nTiO2 to rotifers. In the present study, acute and chronic toxicity of nTiO2 to the freshwater rotifer Brachionus calyciflorus was investigated at different temperatures. At 25°C, the 24 and 48‐hr LC50 was 117.14 and 60.11 mg/L, respectively. At 15°C, 20°C, 25°C, and 30°C, exposure to nTiO2 significantly decreased life expectancy at birth, net reproductive rate, generation time, average lifespan, and/or intrinsic rate of population increase of B. calyciflorus (p < .05). High temperature enhanced the toxicity of nTiO2 to rotifers. The swimming linear speed of rotifers significantly increased (p < .05) in treatments with 200 µg/L nTiO2, compared with the control. In addition, treatments with 8 µg/L to 5 mg/L nTiO2 significantly increased superoxide dismutase activity (p < .05). Glutathione content and catalase activity increased significantly after exposure to 8 µg/L nTiO2 but decreased significantly in treatments with nTiO2 concentrations ranging from 40 µg/L to 5 mg/L (p < .05). There were no significant changes in malondialdehyde contents among nTiO2 treatments and control. Overall, the present study indicated that nTiO2 revealed high toxicity to rotifers, displaying high environmental risks to aquatic ecosystems.

Real-time assessment of the impacts of polystyrene and silver nanoparticles on the hatching process and early-stage development of Artemia using a microfluidic platform

“…141 With greater acute toxicity (Fig. 5A), Ag NPs stimulated more to compensate for a homeostasis imbalance, 143 encouraged faster swimming to escape a dangerous environment, 142 or caused hyperactivity as observed in aquatic invertebrate larvae, including Daphnia magna . 144…”

“…and impairments (e.g., visual, 140 neuromotor deficits, 141 etc.). Conversely, increased swimming speed (negative SSA) may indicate escape reactions from hazardous environments, 138,142 psychostimulant action, or anxiety-like behavior. 141 With greater acute toxicity (Fig.…”

Inhibitory Effects of Antipsychotic Chlorpromazine on the Survival, Reproduction and Population Growth Other Than Neurotransmitters of Zooplankton in Light of Global Warming

“…These findings suggested that high temperatures may increase CPZ toxicity to rotifers. Similarly, the toxicity of nTiO 2 and imidacloprid to B. calyciflorus with increasing temperature [ 66 , 67 ], as well as the toxicity of terbufos, trichlorfon, and imidacloprid to Palaemonetes spp. , Cyprinodon variegatus and Isonychia bicolor [ 68 , 69 ], and the toxicity of an ethoprop- malathion mixture to Oncorhynchus kisutch [ 70 ].…”

Availability of the euryhaline rotifer Proales similis as prey after rapid salinity transfer

“…P. similis has a higher SS than freshwater rotifers species such as Brachionus calyciflorus , Cephalodella gibba , Epiphanes senta , Lecane furcata , Lecane luna , Lecane pyriformis , Lecane hamata and Lepadella patella (0.17–0.54 mm s −1 ). On the other hand, it is lower than Asplanchna girodi , Euchlanis dilatata and Plationus patulus (0.69–0.98 mm s −1 ) (Dong et al, 2020; Rico‐Martínez & Snell, 1997; Santos‐Medrano et al, 2001). Overall, SS of P. similis recovered over time and, in some cases, was higher than that observed in controls.…”