Time-space variations of Cyanophyta algae in the Mundaú/Manguaba lagoon system, Alagoas State, Brazil

Authors

  • Enaide Marinho de Melo Magalhães LABMAR/Universidade Federal de Alagoas, Rua Aristeu de Andrade, 452 - Maceió, AL 57021.090
  • Maria Luise Koening Universidade Federal de Pernambuco, Departamento de Oceanografia, Av. Arquitetura, s/n - Cidade Universitária-Recife, PE, CEP: 50.730-540
  • Eliane Maria de Souza Nogueira Aluna do Curso de Pós-Graduação da Universidade Federal da Paraíba e bolsista da FAPEAL

DOI:

https://doi.org/10.32360/acmar.v37i1-2.6449

Keywords:

Cyanophyta, phytoplankton, estuary, ecology, tropical ecosystem

Abstract

The Mundaú /Manguaba lagoon system is ecologically and economically the most important estuarine ecosystem of Alagoas State, Brazil Phytoplankton and abiotic data were sampled on three stations, during a tidal cycle at the dry (December/ 1997) and rainly (July/1998) seasons, will little salinity oscillations. Water transparency was higher during the rainy season and lower during the dry season. Quantities of dissolved oxygen were above 3.00 ml.L-1 and the concentrations of nutrient showed wide variations, and they were higher during the rainy season except for nitrate. Tweleve taxa were identified, the most abundant being Microcystis aeruginosa (Kützing) Kützing and Oscollatoria sancta Kützing ex Gomant and the most frequent Aphanizomenon gracile (Lemmermann) Lemmermann and Oscilatoria sancta. Phytoplankton densities ranged from 5x103 cel./L-1 to 1,635 x 103 cel./L-1 and the chlorophyll-a concentration from 1.07 mg.m-3 a 36.7 mg.m-3 with the highest values being recorded during the rainy season. In spite of the great quantity of polluting sources at the Mundaú/Manguaba lagoon system, the region of channels remains preserved.

Published

2017-03-10

Issue

Section

Artigos originais