Emissões de óxido nitroso em águas fluviais não poluídas e poluídas da Bacia do Rio Paquequer (Teresópolis, Rio de Janeiro)

Alvim, Renata Barbosa; Mello, William Zamboni de; Silveira, Carla Semiramis; Kligerman, Débora Cynamon; Ribeiro, Ricardo

doi:10.1590/s1413-41522014019000000761

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…In the Piabanha River, a seventh-order stream, the development of a true plankton is possible, as expected for rivers of the third or fourth order and higher, due to the slowing of the current and the increases in luminosity and the different sources of inoculum (Reynolds 2006). However, the Piabanha River receives releases of inadequately treated domestic sewage from point 2 downward, still in its upper course (Alvim et al 2014, De Mello et al 2018, and the water current is increased by the steep slopes, heavy rainfall, and the growing urban settlement in the region. These factors, acting in conjunction with channelization along the river, are changing the hydrological pattern, causing silting and flooding in urban areas (Silva et al 2012, Marques et al 2017, as well as increasing turbidity and reducing light availability.…”

Section: Discussionmentioning

confidence: 99%

Spatial and Temporal Dynamics of Phytoplankton in a Highly Impacted Tropical Montane River

Barreto¹,

Furtado²,

Folharini³

et al. 2022

Oecol. Austr.

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Rivers, as most bodies of water, are subject to eutrophication and water contamination, mainly from domestic sewage and industrial discharges from urban centers and agricultural areas. These growing human impacts result in a gradual loss of water quality and changes in biotic communities, including phytoplankton. Analyzing the dynamics of phytoplankton is important to understand how, in addition to hydrography and the physical, chemical and biological variables, human impact can be a controlling factor in this dynamic. In this study, we analyzed abiotic variables and zooplankton abundance to identify the factors controlling different phytoplankton attributes at six sampling points, in two climatic periods and three years, in the Piabanha River, a slowly flowing stream with to strong human impact beginning in its upper course, in a mountain region in southeastern Brazil. The results showed homogeneous environmental variables and different phytoplankton attributes along most of the stretch analyzed, except for sampling point 1, located in a preserved forest area but with nutrient concentrations limiting phytoplankton growth. The difference in flow between the two climatic periods (dry and wet) was not sufficient to change the total phytoplankton biovolume. Temperature seemed to strongly affect the phytoplankton response, with larger relative contributions from cyanobacteria in the wet period, with higher temperatures, and from phytoflagellates in the dry period, with lower temperatures. As expected, zooplankton showed no influence on phytoplankton dynamics, with a large contribution from small rotifers. In this tropical montane river, with slow flow and intense human impacts, nutrient concentrations and temperature were the main drivers of the spatial and temporal dynamics of phytoplankton, respectively

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Section: Discussionmentioning

confidence: 99%

Spatial and Temporal Dynamics of Phytoplankton in a Highly Impacted Tropical Montane River

Barreto¹,

Furtado²,

Folharini³

et al. 2022

Oecol. Austr.

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“…A qualidade das águas dos rios da bacia do Piabanha é prejudicada pelo lançamento de esgotos domésticos sem tratamento adequado, principalmente a jusante das cidades de Petrópolis e Teresópolis (COPPETEC, 2006;Cesar et al, 2011;Alvim et al, 2014). O rápido escoamento das águas é favorecido pela presença de encostas íngremes, chuvas intensas e pelo aumento da urbanização na região.…”

Section: Introductionunclassified

Hydrological Behavior of the Mountainous Region of Rio de Janeiro: Piabanha Watershed

Marques¹,

Mattos²,

Silveira³

2017

Anuário IGEO UFRJ

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The mountainous region of Rio de Janeiro has a history of natural disasters. The aim of this study was to understand the hydrology of this region. A dataset (up to 70 years) from four rainfall gauges and three stream gauges in Piabanha watershed (2065 km 2 ) was used for this purpose. Mean annual rainfall ranged from 2900 mm (at the headwaters) to 1250 mm in the central area of the watershed. The results showed good correlation between rainfall and stream gauges data. There is a seasonal pattern of dry winters (average month rainfall ranging from 15 to 90 mm) and 20 m 3 /s mean monthly discharge at the watershed outlet and a rainy summer (average month rainfall ranging from 150 to 450 mm) and 80 m 3 /s mean monthly discharge at the watershed outlet. The historical rainfall and discharge dataset showed a cyclicity of about 15 years bounded by the driest years. The most catastrophic events that occurred in the mountainous region of Rio de Janeiro were during the years around the top of the rainfall and discharge cycles. According to the historical trend the last cycle began at 1999 and the present moment (2015)(2016) matches the end of a drier period. However during this last cycle rainfall and discharge trends are not very clear. Together with an increase of great magnitude natural disasters frequency in recent years this may be a sign of an anthropogenic effect. Keywords: rainfall; streamflow; cycle; historical dataset; natural disasters ResumoA região serrana do Rio de Janeiro apresenta um histórico de desastres naturais. Com o objetivo de entender o comportamento hidrológico da região foram analisados dados de chuva (4 estações) e de vazão (3 estações) na bacia do rio Piabanha (2065 km 2 ) com séries históricas de até 70 anos. O total anual médio de pluviosidade variou de 2900 mm (na cabeceira) a 1250 mm na região central da bacia. Os resultados demonstraram boa correlação entre as estações e a existência de sazonalidade com inverno seco (valores médios mensais entre 15 e 90 mm de chuva) e vazão média na foz de 16 m 3 /s e verão chuvoso (valores médios mensais entre 150 e 450 mm de chuva) e vazão média na foz de 80 m 3 /s. As séries históricas de chuva e vazão apresentaram uma ciclicidade, de aproximadamente 15 anos, marcada por anos mais secos. Os dados apontam que os registros existentes de eventos catastróficos regionais foram em anos próximos aos ápices dos ciclos de pluviosidade e vazão propostos. O último ciclo identificado iniciou-se em 1999 e o período atual (2015)(2016) representa o fim deste ciclo, representado pela fase mais seca. Entretanto, neste último ciclo o comportamento da chuva e, principalmente, da vazão é muito variável. Isto, em conjunto com o aumento recente da frequência de desastres naturais de grande magnitude, pode ser um indicativo de efeito antrópico.

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Effects of land use on the concentration and emission of nitrous oxide in nitrogen-enriched rivers

Yang

Lei

2018

Environmental Pollution

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Emissões de óxido nitroso em águas fluviais não poluídas e poluídas da Bacia do Rio Paquequer (Teresópolis, Rio de Janeiro)

Cited by 6 publications

References 22 publications

Spatial and Temporal Dynamics of Phytoplankton in a Highly Impacted Tropical Montane River

Spatial and Temporal Dynamics of Phytoplankton in a Highly Impacted Tropical Montane River

Hydrological Behavior of the Mountainous Region of Rio de Janeiro: Piabanha Watershed

Effects of land use on the concentration and emission of nitrous oxide in nitrogen-enriched rivers

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