&lt;b&gt;Periphytic diatoms as bioindicators in a tropical stream: from urban to rural environments

Moresco, Carina; Gubiani, Éder André; Rodrigues, Liliana

doi:10.4025/actascibiolsci.v37i4.27426

Cited by 3 publications

(1 citation statement)

References 38 publications

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“…Os parâmetros fósforo e nitrogênio foram objetos de pesquisa por Moresco, Guabini e Rodrigues (2015). Estes consideram o nitrogênio e o fósforo como os principais nutrientes limitantes para o crescimento da microbiologia (Ex.…”

Section: Fósforo (P) E Nitrogênio (Nh+3)unclassified

Aspectos físicos, químicos e microbiológicos das águas dos rios Prainha e Uraim, Paragominas, Pará, Brasil

Júnior

Silva²,

Farias³

2019

multiscience

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14Physical, chemical and microbiological aspects on the Prainha and Uraim Rivers water, ABSTRACT The quality of water bodies currently involves laboratory analysis of physical, chemical and microbiological aspects that are altered as a result of urbanization. The objective of this research was to analyze three occurring aspects of two urban rivers: Prainha and Uraim, in the municipality of Paragominas -PA. This method used presented quantitative and qualitative coverage and exploratory character. Water sampling occurred at six different points (three in each of the two water bodies analyzed) according to the recommendations of the National Water Agency and the National Health Foundation. The laboratory analysis of physical parameters (electrical conductivity, temperature, turbidity, total solids, luminosity, wind speed and depth); chemical (hydrogen ionic potential, biological oxygen demand, phosphorus, nitrogen, dissolved oxygen, ox reduction potential); microbiological (term tolerant coliforms). All data obtained and analyzed indicated that the electrical conductivity and variations are associated with the seasonal period analyzed; the tendency of temperature increase in the Prainha River (27 °C) was more effective due to absence of marginal vegetation; in relation to the chemical, the pH is slightly acidic (5.0 to 5.9), and the microbiological, the concentration of thermos tolerant coliforms show a tendency of increase in the rainy period (+ 41.5%) due to the surface runoff during the rainy period in the Prainha river, which do not occur in the Uraim river. KEYWORDS: ciliar forest; hydrogen ionic potential; sediments RESUMO Atualmente, a qualidade dos corpos hídricos envolve análises laboratoriais de aspectos físicos, químicos e microbiológicos que são alterados em função da urbanização. O objetivo dessa pesquisa foi analisar três aspectos ocorrentes de dois rios urbanos: Prainha e Uraim, no município de Paragominas -PA. O método utilizado apresentou abrangência quantiqualitativa e caráter exploratório. As amostragens da água ocorreram em seis pontos distintos (três em cada um dos dois corpos hídricos analisados) de acordo com o preconizado pela Agência Nacional de Águas e Fundação Nacional de Saúde. A análise laboratório dos parâmetros físicos (condutividade elétrica, temperatura, turbidez, sólidos totais, luminosidade, velocidade do vento e profundidade); químicos (potencial hidrogeniônico, demanda biológica de oxigênio, fósforo, nitrogênio, oxigênio dissolvido, potencial de oxirredução); microbiológicos (coliformes termotolerantes). Os dados obtidos e analisados indicaram que a condutividade elétrica as variações estão associadas ao período sazonal analisado; a tendência de elevação da temperatura no rio Prainha (27 °C) foi mais efetiva devido à ausência de vegetação marginal. Em relação ao químico, o pH encontra-se ligeiramente ácido (5,0 a 5,9), e ao microbiológico, a concentração dos coliformes termotolerantes apresentam tendência de elevação no período chuvoso (+ 41,5%), devido o escoamento superficial ...

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Section: Fósforo (P) E Nitrogênio (Nh+3)unclassified

Aspectos físicos, químicos e microbiológicos das águas dos rios Prainha e Uraim, Paragominas, Pará, Brasil

Júnior

Silva²,

Farias³

2019

multiscience

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Unravelling the structural changes of periphyton in relation to environmental variables in a semilotic environment in the Sundarban eco-region, India

et al. 2021

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Eutrophication changes community composition and drives nestedness of benthic diatoms from coastal streams

et al. 2022

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Aim We evaluated changes in periphyton biomass and the composition of benthic diatom communities along a gradient of urbanization in 10 coastal streams located on the coastal plain of southernmost Brazil. Methods At each coastal stream, we obtained limnological variables and periphytic material from the stolon of the aquatic macrophyte Hydrocotyle ranunculoides for further analyses of chlorophyll a and diatoms. Results Total phosphorus was the only limnological variable selected by the statistical models, showing a positive relationship with periphyton biomass and a negative relationship with diatom species richness in these streams. Species composition (for both presence-absence and abundance data) was also explained by total phosphorus. Further, we observed a nested distribution of diatom species along the streams, in which poorer communities of streams with higher concentrations of phosphorous are subsets of richer communities from streams with lower concentrations of the nutrient. Conclusions Our study shows that water quality modifications caused by eutrophication are leading to the loss of species and changes in the structure of biological communities in ecotones such as coastal streams.

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<b>Periphytic diatoms as bioindicators in a tropical stream: from urban to rural environments

Cited by 3 publications

References 38 publications

Aspectos físicos, químicos e microbiológicos das águas dos rios Prainha e Uraim, Paragominas, Pará, Brasil

Aspectos físicos, químicos e microbiológicos das águas dos rios Prainha e Uraim, Paragominas, Pará, Brasil

Unravelling the structural changes of periphyton in relation to environmental variables in a semilotic environment in the Sundarban eco-region, India

Eutrophication changes community composition and drives nestedness of benthic diatoms from coastal streams

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