Structure of the phytoplankton in a water supply system in the State of Pernambuco - Brazil

Brazilian Archives of Biology and Technology

Ariadne Do Nascimento Moura²  Ênio Wocyli Dantas²  Maria Do Carmo Bittencourt-oliveira¹ 

[1] ,Universidade Federal Rural de Pernambuco Departamento de Biologia Recife PE ,Brasil

关键词: Structure;    phytoplankton;    water supply system;    Brazil;   

DOI  :  10.1590/S1516-89132007000400010

来源: SciELO

【 摘 要 】

The aim of this work was to study the phytoplankton community composition at limnetic environment in Pernambuco, Brazil. Samplings were carried out from April/2001 to March/2002. Samples to analyses the biotic variables were taken using a recipient with a large overture, at the subsurface and with a Van Dorn bottle at the bottom. The rainfall data were recorded and the water transparency was used to calculate the light attenuation coefficient, photic zone and the determination of trophic state index. The concentrations of total phosphorus and total nitrogen were determined in a typical dry and rainy month. Equitability, also the, similarity and diversity indexes and the densities and correlation of total densities among depths were calculated. Forty-five taxa were identified in Chlorophyta (21spp), Cyanophyta (17spp) and Bacillariophyta (7spp), while flagellates were quantified in groups without identification. Cyanophyta presented highest diversity at both the depths and Planktothrix agardhii was the highest density species. Significant differences were not observed between subsurface and bottom densities. Results showed that the reservoir was eutrophicated and presented high densities of Cyanophyta.

【 授权许可】

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