Status Of The Barra Das Jangadas Estuary
(North-eastern Brazil): An Ecological Approach
Author(s)
S. J. Macedo, S. Neumann-Leitão, M. L. Koening,
M. Araújo Filho, R. Schwamborn, F. A. N. Feitosa, K. Muniz,
S. R. Lacerda & M. J. Flores Montes
Abstract
The basic hydrological and planktonic characteristics of the Barra das Jangadas
estuary were monitored to assess the water quality and the abiotic factors
influencing the plankton populations. An intensive seven day sampling program
was conducted at a fixed station, during the dry (January/2001) and the rainy
(July/2001) seasons. Phytoplankton, zooplankton and the water physico-chemical
parameters were sampled in different tides, totaling 56 sampling
procedures during the 168-hours-program, in each season. The dissolved oxygen
was under saturation at low tide in both seasons, indicating a polluted area; and
saturated during high tide due to marine influence. High overall nutrient
concentrations indicated an eutrophic environment. Chlorophyll-a was high (~25
mg.m -3 ). The marine eurihaline plankton dominated the area. Phytoplankton
presented 266 species, however only six were abundant and frequent; density
varied from 95.10 3 cel.L -1 to 7,830.10 3 both in the rainy season, and
cyanobacterial blooms usually occurred in the estuary unbalancing the system.
The zooplankton presented 87 taxa and varied from 1,300 to 18,500 ind.m -3 . The
plankton diversity was low, mostly composed of r-strategists. The main pattern
observed was marine eurihaline species in the dry season during high tide and
limnetic species in the rainy season, low tide. During the neap tide in both
seasons the water renovation was very poor, increasing the pollution load
residence time.
Keywords: estuary, water quality, nutrients, phytoplankton, zooplankton.
Keywords
estuary, water quality, nutrients, phytoplankton, zooplankton.
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