Seasonal variation of the phytoplankton community structure in the Sao Joao river, Iguacu National Park, Brazil/Variacao sazonal da estrutura da comunidade fitoplanctonica no Rio Sao Joao, Parque Nacional do Iguacu, Brasil

The limnological characteristics and the phytoplankton community of the pelagic region of the Sao Joao River, tributary of the Iguacu River, Iguacu National Park were analyzed from August 2008 to July 2009. 221 taxa were identified and the Bacillariophyceae class was the most representative. Bacilla...

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Bibliographic Details
Published in:Brazilian journal of biology 2013-02, Vol.73 (1), p.1-1
Main Authors: Bortolini, J.C, Bueno, N.C
Format: Article
Language:English
Subjects:
Algae
Aquatic plants
Bacillariophyceae
Chrysophyceae
estrutura
fitoplâncton
Freshwater
Iguaçu National Park
lotic system
National parks
Parque Nacional do Iguaçu
phytoplankton
Plankton
Rivers
sazonalidade
seasonality
sistema lótico
structure
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Summary:The limnological characteristics and the phytoplankton community of the pelagic region of the Sao Joao River, tributary of the Iguacu River, Iguacu National Park were analyzed from August 2008 to July 2009. 221 taxa were identified and the Bacillariophyceae class was the most representative. Bacillariophyceae and Chrysophyceae were the dominant classes in density and Bacillariophyceae in biovolume. According to the DCA carried out for phytoplankton density and biovolume, significant differences were identified between the periods, and between the sites and study periods, respectively. The highest richness of species reached 40 taxa in September 2008 at station 1. The Shannon-Wiener diversity indexes and evenness, calculated from the density of phytoplankton, were temporally heterogeneous and spatially similar. In general, the significant temporal variations in the composition of the phytoplankton community were due to variations in limnological conditions, mainly temperature, transparency and nutrients. Spatially the structure was more similar due to the proximity among the stations. Moreover, the similarity of the distribution of communities in lotic environments were due to the unidirectional flow.
ISSN:1519-6984
1678-4375