Effects of local land use on riparian vegetation, water quality, and in situ toxicity
Revista Ambiente E Água
Effects of local land use on riparian vegetation, water quality, and in situ toxicity
Autor Correspondente: Alexeia Barufatti | [email protected]
Palavras-chave: anthropic action, inorganic contaminants, risks for aquatic biota
Resumos Cadastrados
Resumo Português:
A conversão de floresta ripária em áreas agrícolas resulta na perda da qualidade da água e da saúde da biota aquática. Assim, os objetivos deste estudo foram determinar a proporção de uso do solo com ênfase no tipo de cobertura vegetal; avaliar os parâmetros limnológicos e a concentração de elementos inorgânicos na água do córrego São José na Bacia do Rio Dourados, Mato Grosso do Sul, Brasil; correlacionar o uso do solo com as concentrações de elementos inorgânicos na água; e avaliar o risco para preservação da biota aquática e efeito tóxico in situ em Astyanax lacustris. Amostras de água do córrego São José foram coletadas em 2020 e avaliado o uso do solo com imagens aéreas de alta resolução. Os elementos inorgânicos nas amostras de água foram quantificados por espectrofotometria de emissão óptica de plasma indutivamente acoplado. No entorno do córrego São José, observou-se a redução da floresta ripária com proporção de 16,32% da área e a predominância de áreas agrícolas com 75,06%. As concentrações de oxigênio dissolvido (1,500 mg L-1) e P (> 0,235 mg L-1) apresentaram valores em desacordo com a legislação nacional. Além disso, Al e P indicaram riscos quanto à conservação da biota aquática (quociente de risco >1). A avaliação in situ de A. lacustris também revelou toxicidade na água. Os resultados indicaram desequilíbrio ambiental no córrego São José e, portanto, requerem medidas mitigadoras para sua recuperação e o uso sustentável de seus recursos.
Palavras-chave: ação antrópica; contaminantes inorgânicos; riscos para a biota aquática
Resumo Inglês:
The conversion of riparian forests into agricultural land results in the loss of water quality and aquatic biota health. The objectives of this study were therefore to determine the proportion of land use with emphasis on the type of vegetation cover; evaluate the limnological parameters and concentration of inorganic elements in the water of the São José stream in the Dourados River Basin, Mato Grosso do Sul, Brazil; correlate land use with the concentrations of inorganic elements in water; and evaluate the risk to preservation aquatic biota and in situ toxic effect on Astyanax lacustris. We collected samples from the São José Stream in 2020 and evaluated land use with high resolution aerial images. The inorganic elements in water samples were quantified using inductively coupled plasma optical emission spectrometry. In the surroundings of the São José stream, a reduction in riparian forest was observed with a proportion of only 16.32% of the area and the predominance of agricultural areas with 75.06%. The concentrations of dissolved oxygen (1.510 mg L-1) and P (> 0.235 mg L-1) in the water did not comply with the national legislation. In addition, Al and P indicated risks regarding the conservation of aquatic biota (risk quotient >1). The in situ evaluation of A. lacustris also revealed toxicity in the water. The results indicate environmental imbalance in the São José stream, requiring mitigation measures for its restoration and the sustainable use of its resources.
Keywords: anthropic action, inorganic contaminants, risks for aquatic biota
Resumo Espanhol:
The conversion of riparian forests into agricultural land results in the loss of water quality and aquatic biota health. The objectives of this study were therefore to determine the proportion of land use with emphasis on the type of vegetation cover; evaluate the limnological parameters and concentration of inorganic elements in the water of the São José stream in the Dourados River Basin, Mato Grosso do Sul, Brazil; correlate land use with the concentrations of inorganic elements in water; and evaluate the risk to preservation aquatic biota and in situ toxic effect on Astyanax lacustris. We collected samples from the São José Stream in 2020 and evaluated land use with high resolution aerial images. The inorganic elements in water samples were quantified using inductively coupled plasma optical emission spectrometry. In the surroundings of the São José stream, a reduction in riparian forest was observed with a proportion of only 16.32% of the area and the predominance of agricultural areas with 75.06%. The concentrations of dissolved oxygen (1.510 mg L-1) and P (> 0.235 mg L-1) in the water did not comply with the national legislation. In addition, Al and P indicated risks regarding the conservation of aquatic biota (risk quotient >1). The in situ evaluation of A. lacustris also revealed toxicity in the water. The results indicate environmental imbalance in the São José stream, requiring mitigation measures for its restoration and the sustainable use of its resources.
Keywords: anthropic action, inorganic contaminants, risks for aquatic biota
