Effects of polymethylmethacrylate nanoplastics on the polychaete Hediste diversicolor: Behavioural, regenerative, and biochemical responses

Aquatic Toxicology, Journal Year: 2023, Volume and Issue: 265, P. 106743 - 106743

Published: Nov. 1, 2023

Plastics, particularly microplastics (MPs) and nanoplastics (NPs), have been regarded as pollutants of emerging concern due to their effects on organisms ecosystems, especially considering marine environments. However, in terms NPs, there is still a knowledge gap regarding the size polymer invertebrates, such benthic organisms. Therefore, this study aimed understand, behavioural, physiological, biochemical endpoints (neurotransmission, energy metabolism, antioxidant status, oxidative damage), 50 nm waterborne polymethylmethacrylate (PMMA) NPs (0.5 500 µg/L) polychaete Hediste diversicolor, key species estuarine coastal ecosystems. Results demonstrated that worms exposed PMMA had shorter burrowing time than control Nevertheless, decreased cholinesterase activity. Energy metabolism was at µg/L, glycogen content all concentrations NPs. Enzymes related defence system (superoxide dismutase glutathione peroxidase) displayed increased activities H. diversicolor specimens between 0.5 which led no damage cell membrane protein levels. In study, polychaetes also lower regenerative capacity when Overall, data obtained emphasize potential consequences worms, with µg/L being most impacted by analysed since sediments are considered be sinks sources plastics, further studies needed better understand impacts different sizes polymers organisms, species.

Language: Английский

The Role of Life Stages in the Sensitivity of Hediste diversicolor to Nanoplastics: A Case Study with Poly(Methyl)Methacrylate (PMMA)

Toxics, Journal Year: 2024, Volume and Issue: 12(5), P. 352 - 352

Published: May 10, 2024

The presence of plastic particles in oceans has been recognized as a major environmental concern. decrease particle size increases their ability to directly interact with biota, the nanometer range (nanoplastics-NPs) displaying higher penetrate biological membranes, which size. This study aimed evaluate role life stages effects poly(methyl)methacrylate (PMMA) NPs on polychaete Hediste diversicolor, key species marine food web and nutrient cycle. Thus, behavioral (burrowing activity clean spiked sediment) biochemical endpoints (neurotransmission, energy reserves, antioxidant defenses, oxidative damage) were assessed juvenile adult organisms after 10 days exposure sediment (between 0.5 128 mg PMMA NPs/Kg sediment). Overall, results show that H. diversicolor is sensitive NPs. In juveniles, exposed took longer burrow sediment, significant differences from controls being observed at all tested concentrations when test was performed whereas NP-spiked only found 8, 32, sediment. Adults displayed lower sensitivity, found, for both types, terms Acetylcholinesterase, used marker neurotransmission, juveniles adults opposite trends, increased (suggesting apoptosis), adults, overall decreased found. Energy-related parameters revealed generally similar pattern (increase organisms) sensitivity (significant even concentrations). also demonstrated increase defenses (higher juveniles), damage protein carbonylation (all conditions) juveniles. data reveal potential affect behavior induce toxic greater

Language: Английский

Biochemical and Behavioural Alterations Induced by Arsenic and Temperature in <em>Hediste Diversicolor</em> of Different Growth Stages

Published: Aug. 29, 2022

Contamination with Arsenic, a toxic metalloid, is increasing in the marine environment. Additionally, global warming can alter metalloids toxicity. Polychaetes are key species environments. By mobilizing sediments, they play vital roles nutrient and element (including contaminants) cycles. Most studies invertebrates focused on effects of either adults or larvae. Here we bring information temperature increase arsenic contamination polychaete Hediste diversicolor different growth stages water temperatures. Feeding activity biochemical responses &ndash; neurotransmission, indicators cell damage, antioxidant biotransformation enzymes metabolic capacity - were evaluated. Temperature rise combined As imposed alterations feeding endpoints at stages. Small organisms have their increased, avoiding lipid damage. However, larger most affected class due to inhibition superoxide dismutase, which resulted protein Oxidative damage was observed smaller exposed 21 &deg;C, demonstrating higher sensibility combination As. The may ecological consequences, affecting cycle nutrients, sediment oxygenation food chain that depend bioturbation this polychaete.

Language: Английский