Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/75466
Título: | Can photocatalytic and magnetic nanoparticles be a threat to aquatic detrital food webs? |
Autor(es): | Pradhan, Arunava Fernandes, Marta Martins, Pedro Manuel Abreu Pascoal, Cláudia Lanceros-Méndez, S. Cássio, Fernanda |
Palavras-chave: | Photocatalytic and magnetic nanoparticles Stream microbial decomposers Stress biomarkers Invertebrate shredders Trophic interactions |
Data: | 2021 |
Editora: | Elsevier |
Revista: | Science of the Total Environment |
Citação: | Pradhan, A., Fernandes, M., Martins, P. M., Pascoal, C., Lanceros-Méndez, S., & Cássio, F. (2021). Can photocatalytic and magnetic nanoparticles be a threat to aquatic detrital food webs? Science of the Total Environment, 769, 144576. doi: https://doi.org/10.1016/j.scitotenv.2020.144576 |
Resumo(s): | Freshwaters are likely to serve as reservoirs for engineered nanomaterials (ENMs) due to their accelerated unintentional release, increasing the relevance of assessing their impacts on aquatic biota and the ecosystem processes they drive. Stream-dwelling microbes, particularly fungi, and invertebrate shredders play an essential role in the decomposition of organic matter and transfer of energy to higher trophic levels. We assessed the impacts of two photocatalytic (nano-TiO2 and erbium doped nano-TiO2) and one magnetic (nano-CoFe2O4) ENMs on detrital-based food webs in freshwaters by exposing chestnut leaves, colonized by stream-dwelling microbes, to a series of concentrations (0.25–150 mg L−1) of these ENMs. Microbial decomposition and biomass of fungal communities, associated with leaves, were not affected by the ENMs. However, the activities of antioxidant enzymes of microbial decomposers were significantly (P < 0.05) stimulated by ENMs in a concentration-dependent way, suggesting oxidative stress in stream microbial communities. The stronger responses of these stress biomarkers against nano-TiO2 (increase upto 837.5% for catalase, 1546.8% for glutathione peroxidase and 1154.6% for glutathione S-transferase) suggest a higher toxicity of this ENM comparing to the others. To determine whether the effects could be transferred across trophic levels, the invertebrate shredder Sericostoma sp. was exposed to ENMs (1 and 50 mg L−1) for 5 days either via contaminated water or contaminated food (leaf litter). Leaf consumption rate by shredders decreased significantly (P < 0.05) with increasing concentrations of ENMs via food or water; the effects were more pronounced when exposure occurred via contaminated food (up to 99.3%, 90.7% and 90.3% inhibition by nano-Er:TiO2, nano-CoFe2O4 and nano-TiO2, respectively). Overall, the tested photocatalytic and magnetic ENMs can be harmful to microbial decomposers and invertebrate shredders further compromising detrital-based food webs in streams. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/75466 |
DOI: | 10.1016/j.scitotenv.2020.144576 |
ISSN: | 0048-9697 |
Versão da editora: | https://www.sciencedirect.com/science/article/pii/S0048969720381079 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CBMA - Artigos/Papers DBio - Artigos/Papers |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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34.pdf | Can photocatalytic and magnetic nanoparticles be a threat to aquatic detrital food webs? | 586,8 kB | Adobe PDF | Ver/Abrir |
Este trabalho está licenciado sob uma Licença Creative Commons