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Acta Amazonica

Print version ISSN 0044-5967On-line version ISSN 1809-4392

Acta Amaz. vol.2 no.2 Manaus Aug. 1972

http://dx.doi.org/10.1590/1809-43921972022087 

CIÊNCIAS DO AMBIENTE

Scattered Light in a Flood-plain Lake of Central Amazônia(1)

W. L. B. Brinkmann1 

1 Instituto Nacional de Pesquisas da Amazônia

Abstract

The light intensity below the surface of Lago Castanho was recorded at 10 minute intervals and compared to the total light intensity above the water surface. Scattered light of the lake water was rather constant and it was found to be sufficiently high to support the growth of photoautotrophic organisms in the near-surface layer. Below the floating plant communities scattered light was extremely low in intensity.

Resumo

Foram medidas, cada 10 minutos, a luz total incidindo sobre a superfície do Lago do Castanho e a luz difusa abaixo da superfície do lago. Verificou-se, nas camadas superficiais da água do lago, intensidade luminosa suficiente para assegurar o desenvolvimento de organismos foto-autotróficos, com variações mínimas durante o dia. Embaixo das massas de capim flutuante, a intensidade da luz difusa era extremamente baixa, máximo: 20 Lux.

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1— Granted by the Banco Nacional de Desenvolvimento Econômico (contract INPA/FUNTEC, 89/70), and by the Conselho Nacional de Pesquisas.

Creative Commons License  This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.