Abstract
The pollution generated by the heavy metals (HM) contained in mining wastes (tailings) is a worldwide recognized environmental concern. Due to the persistence, toxicity, bioaccumulation, and biomagnification capacity through the food chains, the release of HM into the environment causes negative effects on human health and the ecosystems. Wigandia urens Kunth (Boraginaceae) is a plant species that naturally establishes and grows in tailings and is consumed by the grasshopper Sphenarium purpurascens Charpentier (Orthoptera: Pyrgomorphidae). HM accumulation in this plant and their subsequent consumption by defoliating insects allow these contaminants to enter the food webs and favor their biomagnification. This study evaluated the effect of HM bioaccumulation in the leaf tissue of W. urens on the characteristics associated with its physical defense against herbivores and the effect of HM exposure on population parameters of grasshoppers through their ontogeny under controlled conditions. The results showed a significant increase in leaf hardness and in the number of simple and glandular trichomes in the leaves of W. urens growing on mine tailing substrate compared to those grown on the control substrate without HM. W. urens individuals growing on mine tailing substrate presented the following heavy metal foliar bioaccumulation pattern: Fe > Zn > Pb > Cu. These metals were also bioaccumulated in individuals of S. purpurascens fed with leaves of the plants exposed to mine tailings, observing differences in their concentration pattern through ontogeny. Grasshoppers fed on leaf tissue containing HM showed higher mortality in the first two developmental instars and lower body biomass throughout their ontogeny in comparison to the individuals fed on leaf tissue of plants growing on the control treatment without HM. In conclusion, W. urens is a species with phytoremediation potential for soils contaminated with HM, since it is naturally established in contaminated sites, has a wide geographic distribution, and bioaccumulates significant amounts of different HM. Furthermore, as was observed in this report, the W. urens physical and chemical defense against herbivores was enhanced by HM exposure, compromising the fitness and development of the herbivore S. purpurascens through its ontogeny and thus interrupting the entry and transfer of heavy metal through the food chain.
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We thank the support received from the postgraduate program Doctorado en Ciencias Naturales of the Universidad Autónoma del Estado de Morelos (UAEM) for the facilities granted to carry out this project.
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This research was supported by a CONACyT scholarship grant to J.E.A. (Grant: 784276). Also, we thank Rosalind Pearson Hedge for her comments and English edition that improved our manuscript.
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Esteves-Aguilar, J., Mussali-Galante, P., Valencia-Cuevas, L. et al. Ecotoxicological effects of heavy metal bioaccumulation in two trophic levels. Environ Sci Pollut Res 30, 49840–49855 (2023). https://doi.org/10.1007/s11356-023-25804-0
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DOI: https://doi.org/10.1007/s11356-023-25804-0