| Texto completo | |
| Autor(es): |
Cardoso-Silva, Sheila
;
Mizael, Juliana Soares Silva
;
Frascareli, Daniele
;
Ferreira, Paulo Alves de Lima
;
Figueira, Rubens Cesar Lopes
;
Pompeo, Marcelo
;
Vicente, Eduardo
;
Moschini-Carlos, Viviane
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Environmental Science and Pollution Research; v. N/A, p. 17-pg., 2024-02-28. |
| Resumo | |
The historical impacts of eutrophication processes were investigated in six subtropical reservoirs (Sao Paulo, Brazil) using a paleolimnological approach. We questioned whether the levels of pigment indicators of algal biomass could provide information about trophic increase and whether carotenoid pigments could offer additional insights. The following proxies were employed: organic matter, total phosphorus, total nitrogen, photosynthetic pigments (by high-performance liquid chromatography), sedimentation rates, and geochronology (by 210 Pb technique). Principal component analysis indicated a gradient of eutrophication. In eutrophic reservoirs (e.g., Rio Grande and Salto Grande), levels of lutein and zeaxanthin increased over time, suggesting growth of Chlorophyta and Cyanobacteria. These pigments were significantly associated with algal biomass, reflecting their participation in phytoplankton composition. In mesotrophic reservoirs, Broa and Itupararanga, increases and significative linear correlations (r > 0.70) between pigments and nutrients are mainly linked to agricultural and urban activities. In the oligotrophic reservoir Igarata, lower pigment and nutrient levels reflected lesser human impact and good water quality. This study underscores eutrophication's complexity across subtropical reservoirs. Photosynthetic pigments associated with specific algal groups were informative, especially when correlated with nutrient data. The trophic increase, notably in the 1990s, may have been influenced by neoliberal policies. Integrated pigment and geochemical analysis offers a more precise understanding of eutrophication changes and their ties to human factors. Such research can aid environmental monitoring and sustainable policy development. (AU) | |
| Processo FAPESP: | 14/22581-8 - A Diretiva Quadro da Água da Comunidade Européia: aplicações à realidade dos reservatórios brasileiros |
| Beneficiário: | Marcelo Luiz Martins Pompêo |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 16/15397-1 - Ciclagem de carbono orgânico em reservatórios do brasil e alemanha: influência dos usos do solo e hidrologia |
| Beneficiário: | Daniele Frascareli |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 16/17266-1 - A Diretiva Quadro da Água da Comunidade Européia: aplicações utilizando o fitoplâncton como discriminador ambiental em reservatórios brasileiros |
| Beneficiário: | Viviane Moschini Carlos |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 19/10845-4 - Qualidade da água de reservatórios paulistas: o peso das evidências |
| Beneficiário: | Marcelo Luiz Martins Pompêo |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |