Structure and temporal variation of the phytoplankton of a macrotidal beach from the Amazon coastal zone

The present study aimed to analyze the structure and the temporal variation of the phytoplankton of Ajuruteua beach (Bragança, Pará) and to investigate the influence of environmental variables on the dynamics of this community to provide a basis about the trophic state of this environment. Biologica...

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Bibliographic Details
Published in:Anais da Academia Brasileira de Ciências 2016-09, Vol.88 (3), p.1325-1339
Main Authors: Matos, Jislene B, Oliveira, Suellen M O DE, Pereira, Luci C C, Costa, Rauquírio M DA
Format: Article
Language:English
Subjects:
Amazon beaches
Biomass
Brazil
Cyanobacteria - classification
Diatoms - classification
Dinoflagellida - classification
microalgae
MULTIDISCIPLINARY SCIENCES
Phytoplankton - classification
Salinity
seasonal variation
Seasons
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Summary:The present study aimed to analyze the structure and the temporal variation of the phytoplankton of Ajuruteua beach (Bragança, Pará) and to investigate the influence of environmental variables on the dynamics of this community to provide a basis about the trophic state of this environment. Biological, hydrological and hydrodynamic samplings were performed during a nyctemeral cycle in the months of November/08, March/09, June/09 and September/09. We identified 110 taxa, which were distributed among the diatoms (87.3%), dinoflagellates (11.8%) and cyanobacteria (0.9%), with the predominance of neritic species, followed by the tychoplankton species. Chlorophyll-a concentrations were the highest during the rainy period (24.5 mg m-3), whereas total phytoplankton density was higher in the dry period (1,255 x 103 cell L-1). However, phytoflagellates density was significantly higher during the rainy period. Cluster Analysis revealed the formation of four groups, which were influenced by the monthly differences in the environmental variables. The Principal Component Analysis indicated salinity and chlorophyll-a as the main variables that explained the components. Spearman correlation analysis supported the influence of these variables on the local phytoplankton community. Overall, the results obtained suggest that rainfall and strong local hydrodynamics play an important role in the dynamic of the phytoplankton of Ajuruteua beach, by influencing both environmental and biological variables.
ISSN:0001-3765
1678-2690
1678-2690
0001-3765
DOI:10.1590/0001-3765201620150688