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Urban influence on the water quality of the Uberaba River basin: an ecotoxicological assessment.
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- Author(s): Curado, Ana Luisa; de Oliveira, Camila Cunha; Costa, William Raimundo; Marfil Anhê, Ana Carolina Borella; dos Santos Senhuk, Ana Paula Milla
- Source:
Revista Ambiente e Água; 2018, Vol. 13 Issue 1, p1-10, 10p- Subject Terms:
- Source:
- Additional Information
- Alternate Title: Influência urbana na qualidade da água da bacia do Rio Uberaba: uma avaliação ecotoxicológica. (Portuguese)
- Subject Terms:
- Abstract: Ecotoxicological tests applied to Tradescantia pallida, Allium cepa and Lactuca sativa were used to assess the quality of the Uberaba River basin under urban area influence. Water samples were collected at eight different points during the dry season. The samples were assessed using the following toxicity indicators: micronuclei percentage in T. pallida pollen grains (TRAD-MN), seed germination, root growth, mitotic index (MI) and micronuclei in A. cepa root-cells, and seed germination and root growth in L. sativa. Water physicochemical parameters such as temperature, dissolved oxygen (DO), pH and electric conductivity were assessed in situ. The three plant species were efficient bio-indicators, since they presented good cost-benefit and fast and easily interpreted results, thus completing the physicochemical parameters. There was strong correlation between seed germination and root growth among the ecotoxicological parameters assessed in L. sativa and A. cepa. The micronuclei percentage in T. pallida and the MI in A. cepa presented strong correlation with water electric conductivity and moderate and negative correlation with DO. Water electric conductivity ranged from 75 to 438 µS.cm-1; and the DO concentrations ranged from 0.5 to 6.9 mg.L-1. The importance of pollution control measures in the Uberaba River basin stands out. From the supply-water capture point, the basin is strongly affected by pollution, mainly in the tributaries that cross the city. It presents a short, or almost absent, riparian forest line, residues on the river banks, and it is impacted by discharges of untreated sewage, among other anthropic actions. [ABSTRACT FROM AUTHOR]
- Abstract: Testes ecotoxicológicos com Tradescantia pallida, Allium cepa e Lactuca sativa foram utilizados para avaliar a qualidade da bacia do rio Uberaba, sob influência da área urbana. Amostras de água coletadas em oito pontos, no período seco, foram avaliadas pelos indicadores de toxicidade: porcentagem de micronúcleos em grãos de pólen de T. pallida (TRAD-MN), germinação das sementes, crescimento radicular, índice mitótico (MI) e micronúcleos em células da raiz de A. cepa, e germinação e crescimento radicular de L. sativa. Os parâmetros físico-químicos da água: temperatura, oxigênio dissolvido (OD), pH e condutividade elétrica foram analisados no momento da coleta. As três espécies vegetais foram eficientes como bioindicadores, tendo bom custo-benefício e resultados rápidos e facilmente interpretáveis, complementando os parâmetros físico-químicos. Dentre os parâmetros ecotoxicológicos analisados em L. sativa e A. cepa, foi verificada forte correlação entre a germinação das sementes e o crescimento radicular. A porcentagem de micronúcleos em T. pallida e MI em A. cepa apresentaram forte correlação com condutividade elétrica da água e correlação moderada e negativa com OD. A condutividade elétrica da água variou de 75 a 438 µS.cm-1 e as concentrações de OD, de 0,5 a 6,9 mg.L-1. Evidencia-se a importância de medidas de controle da poluição na bacia do rio Uberaba, que a partir do ponto de captação de água para abastecimento, encontra-se altamente impactado, principalmente os afluentes que cortam o município, apresentando estreita faixa de mata ciliar ou nenhuma, depósito de resíduos nas margens, lançamento de esgoto in natura, entre outras ações antrópicas. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Revista Ambiente e Água is the property of Revista Ambiente e Agua and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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