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Limnological characteristics
of three aquatic systems of the preamazonian floodplain, Baixada
Maranhense (Maranhão, Brazil)
M.S.R. Ibañez, P.R.S. Cavalcante, J.P. Costa
Net, R. Bariberi, J.P. Pontes,
S.C.C. Santana, C.L.M. Serra, N. Nakamoto, O. Mitamura
Departamento de Oceanografia e Limnologia,
Universidade Federal do Maranhão, Campus Universitdrio
do Bacanga Av. dos Ponugueses s/n, (PEP 65080-040, São
Lois, MA, Brazil
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Abstract
Preliminary information is provided on physical
and chemical characteristics of three aquatic systems in the pre-amazonian
floodplain, Baixada Maranhense: Pindaré (Viana Lake) and
the Pericumâ and Turiaçu rivers. Emphasis is given
to the nutrients analyzed spectrophotometrically from the bottom
sediments of Viana Lake. The water bodies differ from each other
with respect to conductivity, total suspended solids and nutrient
contents in the water, with higher values (except for total nitrogen)
in the dry season. The main factors responsible for such differences,
besides the annual flood, are the presence of macrophytes on Pericumâ,
riparian vegetation on Turiaçu (both systems with lotic characteristics)
and water buffalo at Viana Lake. Bottom sediments with low nutrient
concentrations at Viana Lake may be due to the rapid mineralization
of organic matter in this lentic environment. © 2000 Elsevier
Science Ltd. All rights reserved.
Keywords: Nutrients; Macrophytes; Riparian vegetation
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