Multigenerational exposure of populations of Oppia nitens to zinc under pulse and continuous exposure scenarios

Abstract

Current soil remediation guidelines for metals reflect single‐generation laboratory studies, but in the field, organisms are exposed to metals for more than one generation. The present study assessed the multigenerational effect of zinc (Zn) on Oppia nitens under a pulse or continuous exposure scenario. Synchronized adult mites (parents) were exposed to 6 concentrations of Zn in a field soil. For the pulse exposure, juveniles of parent mites from 3 of the 6 concentrations (105, 158, 237, 335, 553, and 800 mg/kg) were kept in clean media and reared until the third generation. At every generation, the sensitivity of the mites to Zn was tested in a dose–response manner. For the continuous exposure, the mites produced from the parents were re‐exposed to the same concentration as their parents. According to critical‐level estimates like the median effect concentration, all populations of the F2 and F3 generation mites in the pulse exposure were less sensitive to Zn than the parents and were protected at 250 mg/kg of Zn (Canadian Council of Ministers of the Environment [2018] soil quality guideline). However, the mite generations of the continuous exposure remained as sensitive as the parent generation and were not protected by the Zn guideline level. The Zn niche width narrowed considerably for all continuously exposed mite populations, indicating that they were more sensitive than the parent. Our results show that Zn has a deleterious multigenerational effect on continuously exposed populations of mites. Environ Toxicol Chem 2019;38:896–904. © 2019 SETAC

Paternal multigenerational exposure to an obesogenic diet drives epigenetic predisposition to metabolic disorders

“…For instance, in guppies, a wide range of plastic responses under different light conditions were observed, which were dependent on multigenerational exposure to different light environments [28]. In mites, zinc element sensitivity increased by continuous multigenerational exposure [29]. In mice, male sensitivity to environmental estrogens was enhanced by successive generations of exposure [30].…”

Oppia nitensC.L. Koch, 1836 (Acari: Oribatida): Current Status of Its Bionomics and Relevance as a Model Invertebrate in Soil Ecotoxicology

“…Moreover, as discussed within the present review, the species has also been used in the assessment of spiked chemical substances in soils (e.g., metals and pesticides). Oppia nitens also meets the criteria for a "desirable" test species (Stephenson 2003;Römbke et al 2006;Van Gestel 2012) because of its 1) ecological relevance to temperate and northern ecozones, 2) ability to represent functional and taxonomical diversity (adding to the overall diversity of the available test battery of species), 3) intimate contact with the soil environment and contaminants within, 4) varied contaminant tolerance (as demonstrated through studies to date), 5) varied routes of exposure (e.g., dermal and oral), and 6) amenability to life cycle tests (e.g., Jegede et al 2019a).…”

“…More recently, a multigenerational response of the mite population to Zn (mostly <800 mg/kg of zinc in natural soil) was modeled using a population growth rate approach. Population growth rate shows subsequent generations of O. nitens to be more sensitive to Zn than their parents (Jegede et al 2019a).…”

“…Population growth rate shows subsequent generations of O . nitens to be more sensitive to Zn than their parents (Jegede et al ).…”

Assessment of the risk of death of Clarias gariepinus and Oreochromis niloticus pulse-exposed to selected agricultural pesticides

“…Despite increasing studies on pulse and repeated pulse exposure of aquatic organisms to pesticides or other toxicants spanning over a decade 20 , 22 – 25 , little is known on the responses of catfish and Nile tilapia pulse exposed to pesticides and how species difference, pulse length, and size may influence pulse toxicity of pesticides. Most pesticide toxicity studies involving both species were performed using continuous exposure setups.…”