| Texto completo | |
| Autor(es): |
Rocha, Giseli Swerts
;
Lombardi, Ana Teresa
;
Espindola, Evaldo L. G.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF APPLIED PHYCOLOGY; v. N/A, p. 13-pg., 2025-09-03. |
| Resumo | |
Metal discharges from anthropogenic activities are of great concern, and the effects of metallic mixtures in aquatic environments are still not fully understood. This study aimed to evaluate the effects of cadmium (Cd) and copper (Cu), isolated and combined, in the growth and photosynthesis - photosystem II (PSII) activity (Phi PSII = Fv/FM), effective quantum yield, photochemical (qP) and non-photochemical quenching (qN and NPQ), and quenchings of regulated ((Y(NPQ)) and non-regulated ((Y(NO)) non-photochemical energy loss in photosystem II, in addition to the rapid light curves of the freshwater green microalga Ankistrodesmus densus. Both metals affected algal physiology and when combined most of the responses were antagonists, i.e., the observed effects were lower than those predicted for the mixture. The contaminants decreased the chlorophyll a production, photosynthetic activity, and increased heat dissipation, suggesting activation of the photoprotection mechanisms and with no evidence of photoprotection damage in the algae. Except for Y(NO), all evaluated photosynthetic parameters were sensitive indicators of the changes observed in microalgae under Cd and Cu exposure, isolated or combined. In addition, we suggest that algal protective mechanisms were efficient to decrease the impact of the combination of metals, reinforced by the increases in qN, NPQ and Y(NPQ), resulting mainly in antagonism in photosynthetic parameters. (AU) | |
| Processo FAPESP: | 15/25436-1 - Influência de cobre e cádmio em alga e seus efeitos ecotoxicológicos em zooplâncton de água doce |
| Beneficiário: | Giseli Swerts Rocha |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 18/07988-5 - Bioprospecção, caracterização e otimização de microalgas brasileiras para a biofixação de CO2 e produção de biomoléculas de importância comercial |
| Beneficiário: | Ana Teresa Lombardi |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |