Zooplâncton em córregos sob diferentes usos da terra na bacia do Rio Preto (Distrito Federal e Goiás) / Zooplankton of streams under different land uses in RiomPreto watershed (Federal District and state of Goiás, Brazil)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The zooplankton community has high environmental sensitivity and quickly responds to changes in the environment with changes in its abundance and diversity. Yet, little is known about the aquatic organisms of the Cerrado, as well there had been few investigations on the zooplankton of Brazilian lotic environments. This work had the aims to characterize two streams of Rio Preto watershed, part of the Rio São Francisco watershed; to assess their zooplankton communities and the relationships between chlorophyll a and physical and chemical characteristics of water; and to contrast forested and agricultural streams. Two streams, located in the Cerrado Biome (Federal District and the state of Goiás), were sampled for four weeks in dry and rainy seasons. Zooplankton and water samples were taken in two sampling points per stream. Physical and chemical characteristics of water and chlorophyll a concentration were determined. Ionic concentration was higher on rainy season in both streams. The agricultural stream (Estanislau) had higher concentrations of nitrate, sodium, chloride, and chlorophyll a than the forested stream (Pindaiba). Zooplankton was characterized by very low densities and high species richness, with a total of 63 taxa recorded on both streams. Zooplankton density and species richness were higher in Pindaiba stream. Estanislau stream has signs to be suffering negative impacts from the agricultural land use of its watershed.

ASSUNTO(S)

cerrado microinvertebrados cerrado córregos potamoplankton zooplankton potamoplâncton streams zooplâncton microinvertebrates

ACESSO AO ARTIGO

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