2025-08-292025-08-292025-05-30PEREIRA JÚNIOR, Antônio. Qualidade da água e as pressões antrópicas em ambientes urbanos amazônicos: o caso do igarapé Paragominas (PA). Orientador Gundisalvo Piratoba Morales. 2025. 148 f. Tese (Doutorado em Ciências Ambientais) - Centro de Ciências Naturais e Tecnologia, Universidade do Estado do Pará, Belém, 2025.https://portaldaposgraduacao.uepa.br/handle/riuepa/250AbertoImpactos antropogênicosÍndice de integridade do habitatUrbanizaçãoAnthropogenic impactsHabitat integrity indexUrbanizationTeseEngenharias::Engenharia Sanitária::Saneamento Ambiental::Qualidade do Ar, das Águas e do SoloThe environmental problems faced by Brazilian municipalities often involve deforestation processes, changes in environmental aspects and degradation of water quality. However, not all of the country's 5,570 municipalities have systematized data on these issues. This gap was identified in the municipality of Paragominas (PA), which motivated the realization of this research, whose objective was to analyze the relationships between deforestation, environmental aspects, and water quality in the urban stretch of the Paragominas stream. The methodological approach adopted was investigative, observational in nature and quantitative-qualitative. The analyzed stretch crosses the urban zone and was randomly divided into five areas, organized from the least urbanized to the most urbanized point, following the upstream-downstream direction. The results indicated that deforestation was driven by the expansion of agriculture (from 1,342 ha to 103,164 ha) and urban area (from 1,331.5 ha to 2,026.8 ha), resulting in the loss of 207.9 ha of water surface. These transformations contributed to the degradation of the integrity of aquatic habitat. The analysis of the data obtained allowed us to characterize the environmental states of the five sampled areas, evidencing significant impacts resulting from anthropogenic pressure on the urban water system. A1: Constantino Pereira do Sacramento Highway, with replacement of riparian forest by shrub and herbaceous vegetation, which decreed high values for anthropogenic impacts - IA (∑ = 55) and for environmental condition - CA (∑ = 46), therefore, the value of the Habitat Integrity index was also high (IIH = 47.2%), therefore "impacted area", due to changes in extension - E (width - L, 97± 49.1m; length – C = 95.7 ± 4.0m; depth – P = 1.8 ± 0.3 m), which altered the water quality – QA (T ºC = 32.2 ± 2.2 ºC; DO = 2.0 ± 1.1 mg/L; NH3 = 0.13 mg/L); On the A2: Avenida Selecta, IA (∑ = 31); CA (∑ = 29), indicated a low IIH ( = 28.6%), therefore, "highly impacted area", E (L = 73 ± 38.0 m; C = 47.3 ± 9.5 m ; P = 1.1 ± 0.3m); QA (TºC = 32.6 ± 2.1 ºC; DO = 2.3 ± 0.8 mg/L; NH3 = 0.26 mg/L); In A3: confluence of Gregório Santos Araujo Street with PA 125, , IA (∑ = 24); CA (∑ = 24); IIH (= 7.8%), i.e. "highly impacted area", QA (T.ºC = 3.1.5 ± 1.0; DO = 1.7 ± 0.4 mg/L; NH3 = 0.37 mg/L); A4 – Lago Verde, the IA (∑ = 10), CA (∑ - 3), IIH (4.2), highly impacted area"; E (L = 100.0 ± 50 m; C = 34.0 ± 9.2 m; P = 2.0 ± 0.6m); QA (TºC = 37.8 ± 2.6; DO = 0.9 ± 0.2 mg/L; NH3 = 0.81 mg/L); A5 – Padre Carvalho Street: IA (∑ = 36); CA (∑ = 37); IIH (10.4) "highly impacted area"; QA ( TºC = 32.2 ± 1.0; DO = 1.2 ± 0.9 mg/L; NH3 = 1.21 mg/L). Therefore, the urban stretch of the Paragominas stream, after urbanization, suffers anthropogenic impacts that alter the environmental conditions of the aquatic habitat and is interfering with the gradual loss of water quality.PPGCA - Estudos de ecossistemas amazônicos