Artigo

Observations on aquatic Macrophyte Dynamics In the Reservoir Of The Balbina Hydroelectric Powerplant, Amazonas State, Brazil

Between 1991 and 1995 aquatic macrophyte composition was observed in the lower part of the reservoir of the hydroelectric power plant of Balbina (Amazonas, Brazil). After closure of the dam in 1987, vegetation cover - mostly Eichhornia crassipes - was high, but was not quantified. After 1990 it decl...

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Autor principal: Walker, Ilse
Outros Autores: Miyai, Roberto, Melo, M. D. Amaral de
Grau: Artigo
Idioma: English
Publicado em: Acta Amazonica 2020
Assuntos:
Hydroelectric Power Plants
Amazonas
Balbina
Water Plants
Usinas Hidrelétricas
Amazonas
Balbina
Macrófitas Aquáticas
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/13397
id oai:repositorio:1-13397
recordtype dspace
spelling oai:repositorio:1-13397 Observations on aquatic Macrophyte Dynamics In the Reservoir Of The Balbina Hydroelectric Powerplant, Amazonas State, Brazil Observações sobre a dinâmica de Macrófitas aquáticas no lago da usina hidrelétrica de Balbina, Amazonas, Brasil Walker, Ilse Miyai, Roberto Melo, M. D. Amaral de Hydroelectric Power Plants Amazonas Balbina Water Plants Usinas Hidrelétricas Amazonas Balbina Macrófitas Aquáticas Between 1991 and 1995 aquatic macrophyte composition was observed in the lower part of the reservoir of the hydroelectric power plant of Balbina (Amazonas, Brazil). After closure of the dam in 1987, vegetation cover - mostly Eichhornia crassipes - was high, but was not quantified. After 1990 it declined rapidly with a characteristic succession patternEichhornia ® Vincularia + Cyperaceae ® Salvinia. The Cyperaceae, and many other less dominant species, were mostly associated with drift wood, produced by the decomposing, emergent forest. Comparison of the chemical data of the Uatumã river before the construction of the dam (1983) with those of later years (1989 - 1995) suggests that the succession was the result of a relatively mild and short period of eutrophication, followed by declining nutrient levels. Annual variation of water levels, followed by aquatic and terrestrial decomposition of the marginal vegetation, may allow for the maintenance of relatively productive vegetation belts along the shore lines of islands and inundated stream valleys. Entre 1991 e 1995 a composição das macrófitas aquáticas da porção inferior do reservatório da hidrelétrica de Balbina foi observada. Após o fechamento do lago pela barragem em 1987 a cobertura do lago por macrófitas aquáticas, principalmente por Eichhornia crassipes, foi alta, mas não existem dados quantitativos. A partir de 1990 a redução da cobertura foi rápida, e notou-se uma sucessão nítida e consistente em diversas áreas do lago: Eichhornia ® Utricularia e Cyperaceae ® Salvinia. As ciperáceas e outras plantas menos dominantes foram associadas com madeiras flutuantes provenientes da floresta emergente em decomposição. O monitoramento contínuo das condições químicas da água (1983 - presente) sugere que a sucessão é o resultado de um período relativamente curto de eutrofização, seguido por um declínio rápido do teor de nutrientes. Devido as variações anuais do nível d'água, a faixa marginal das ilhas e dos igarapés inundados é caraterizada por solos relativamente ricos, graças à decomposição periódica de plantas terrestres inundadas na cheia, e de macrófitas aquáticas na seca. Portanto, espera-se que o lago, com suas milhares de ilhas e igarapés inundados, sustente uma certa produtividade pesqueira, apesar do baixo nível de nutrientes do lago.", 'pt 2020-04-24T15:22:27Z 2020-04-24T15:22:27Z 1999 Artigo https://repositorio.inpa.gov.br/handle/1/13397 10.1590/1809-43921999292265 en Volume 29, Número 2, Pags. 243-265 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Acta Amazonica
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language English
topic Hydroelectric Power Plants
Amazonas
Balbina
Water Plants
Usinas Hidrelétricas
Amazonas
Balbina
Macrófitas Aquáticas
spellingShingle Hydroelectric Power Plants
Amazonas
Balbina
Water Plants
Usinas Hidrelétricas
Amazonas
Balbina
Macrófitas Aquáticas
Walker, Ilse
Observations on aquatic Macrophyte Dynamics In the Reservoir Of The Balbina Hydroelectric Powerplant, Amazonas State, Brazil
topic_facet Hydroelectric Power Plants
Amazonas
Balbina
Water Plants
Usinas Hidrelétricas
Amazonas
Balbina
Macrófitas Aquáticas
description Between 1991 and 1995 aquatic macrophyte composition was observed in the lower part of the reservoir of the hydroelectric power plant of Balbina (Amazonas, Brazil). After closure of the dam in 1987, vegetation cover - mostly Eichhornia crassipes - was high, but was not quantified. After 1990 it declined rapidly with a characteristic succession patternEichhornia ® Vincularia + Cyperaceae ® Salvinia. The Cyperaceae, and many other less dominant species, were mostly associated with drift wood, produced by the decomposing, emergent forest. Comparison of the chemical data of the Uatumã river before the construction of the dam (1983) with those of later years (1989 - 1995) suggests that the succession was the result of a relatively mild and short period of eutrophication, followed by declining nutrient levels. Annual variation of water levels, followed by aquatic and terrestrial decomposition of the marginal vegetation, may allow for the maintenance of relatively productive vegetation belts along the shore lines of islands and inundated stream valleys.
format Artigo
author Walker, Ilse
author2 Miyai, Roberto
Melo, M. D. Amaral de
author2Str Miyai, Roberto
Melo, M. D. Amaral de
title Observations on aquatic Macrophyte Dynamics In the Reservoir Of The Balbina Hydroelectric Powerplant, Amazonas State, Brazil
title_short Observations on aquatic Macrophyte Dynamics In the Reservoir Of The Balbina Hydroelectric Powerplant, Amazonas State, Brazil
title_full Observations on aquatic Macrophyte Dynamics In the Reservoir Of The Balbina Hydroelectric Powerplant, Amazonas State, Brazil
title_fullStr Observations on aquatic Macrophyte Dynamics In the Reservoir Of The Balbina Hydroelectric Powerplant, Amazonas State, Brazil
title_full_unstemmed Observations on aquatic Macrophyte Dynamics In the Reservoir Of The Balbina Hydroelectric Powerplant, Amazonas State, Brazil
title_sort observations on aquatic macrophyte dynamics in the reservoir of the balbina hydroelectric powerplant, amazonas state, brazil
publisher Acta Amazonica
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/13397
_version_ 1787144871030554624
score 11.755432

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