Ecologia e manejo de macrófitas aquáticas em reservatórios

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Data

1998-03

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Editor

Associação Brasileira de Limnologia

Resumo

The increased growth of aquatic macrophytes and the weed problems which they can cause in reservoirs has drawn the attention of researchers and hydroelectric environmental technicians. Here we address some theoretical issues about reservoir colonization by aquatic macrophytes. Local processes (nutrient inputs, margin development, slope, depth, light penetration, water level fluctuation and biological succession processes), together with regional processes (regional species pool, dispersion and invasion rates by non-native species) are among the main factors that control species composition and abundance. Excessive aquatic vegetation growth is promoted mainly by environmental shifts following reservoir construction. This situation is intensified when species are introduced. The generally-high tolerance of disturbance by aquatic macrophytes (resulting from their commonly-held biological characteristics of high dispersion capacity, colonization and regrowth, high growth rates, high phenotypic plasticity and existence of dormancy) allows them to resist weed control efforts quite well. The traditional control methhods (chemical, mechanical and biological) are often of limited efficiency in large freshwater systems. The lack of basic ecological studies and the lack of monitoring are also factors which explain the low efficiency of such methods.

Descrição

Palavras-chave

Reservatório, Macrófitas aquáticas, Manejo, Aquatic macophytes, Rreservoirs, Management

Citação

THOMAZ, S. M.; BINI, L. M. Ecologia e manejo de macrófitas aquáticas em reservatórios. Acta Limnologica Brasiliensia, Rio Claro, v. 10, n. 1, p. 103-116, jan./mar. 1998.