Publications by authors named "E L G Espindola"
New insights about the toxicity of 2,4-D: Gene expression analysis reveals modulation on several subcellular responses in Chironomus riparius.
Pestic Biochem Physiol
September 2024
Herbicides are the main class of pesticides applied in crops and are capable of polluting the surrounding freshwater system; thus, understanding their impact on non-target species, whose mechanism of action is not described, helps to elucidate the real risks of these pollutants to the environment. 2,4-dichlorophenoxyacetic acid (2,4-D) is frequently detected in water and, due to its persistence, poses a risk to wildlife. In this way, the present work aimed to describe the implication of exposure to concentrations of 2,4-D already reported in aquatic environments in several physiological mechanisms of C.
View Article and Find Full Text PDFPesticides are released into the environment daily, and their effects on nontarget species in aquatic ecosystems have been widely reported. To evaluate the adverse effects caused in adults of Danio rerio species exposed to the pesticides abamectin, difenoconazole, and their commercial formulations (Kraft 36EC® and Score 250EC®), both isolated and in mixtures, biochemical biomarkers were analyzed in the gills of organisms exposed to sublethal concentrations. To this end, the activities of the enzymes 7-ethoxyresorufin-O-deethylase (EROD), glucuronosyltransferase (UDPGT), glutathione-S-transferase (GST), catalase (CAT), glutathione peroxidase (GPx), glutathione reductase (GR), lipid hydroperoxide (LH), and malondialdehyde (MDA), which are indicative of oxidative stress, were measured after 48 h of exposure to the different pesticide treatments.
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- Aquatic organisms like Daphnia magna rely on chemical cues in their environment for survival, and this study assessed their ability to avoid fipronil-contaminated areas after a short exposure to the insecticide.
- The HeMHAS system was used to evaluate the daphnids' swimming behavior and habitat preference, showing they favored less contaminated areas despite experiencing decreased swimming ability due to fipronil exposure.
- The research highlights the need for non-forced exposure methodologies in ecological studies, aiming to better understand the impact of contaminants on habitat selection and overall ecosystem health.
Article Synopsis
- - Contamination by toxic metals like cadmium, lead, and zinc is a major global health and environmental concern, and using sorbents such as peat, compost, and biochar can help remediate contaminated soil and water effectively and sustainably.
- - The study found that the bioaccessibility of these metals varied with the type of sorbent used, showing that compost was the most effective for lead, while for cadmium and zinc, peat outperformed biochar.
- - While biochar helped reduce the concentration of metals, its own toxicity and the need to manage dosages were concerns, indicating that careful use of these materials is crucial to minimize ecological harm in remediation efforts.
Brazil is a major producer of sugarcane bioethanol, which has raised concerns about its environmental impact. The industrial process for obtaining ethanol generates a by-product with a high pollution potential called vinasse. If vinasse reaches watercourses, it may affect the biological communities, such as the aquatic macroinvertebrates, which include species sensitive to environmental contamination.
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