Phytoplankton of two rivers in the eastern Amazon: characterization of biodiversity and new occurrences

During the various hydrological periods in 2011, we studied the phytoplankton along an 87-km stretch of the Araguari and Falsino rivers, which are located in the eastern Brazilian Amazon, in the state of Amapá, Brazil, the most ecologically preserved state in the country. In the study area, the aqua...

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Bibliographic Details
Published in:	Acta Botânica Brasílica Vol. 27; no. 2; pp. 364 - 377
Main Authors:	Cunha, Elane Domênica de Souza, Cunha, Alan Cavalcanti da, Silveira Jr, Arialdo Martins da, Faustino, Silvia Maria Mathes
Format:	Journal Article
Language:	English
Published:	Sociedade Botânica do Brasil 01-06-2013
Subjects:	algae Amapá floristic survey reservoir river
Online Access:	Get full text
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Summary:	During the various hydrological periods in 2011, we studied the phytoplankton along an 87-km stretch of the Araguari and Falsino rivers, which are located in the eastern Brazilian Amazon, in the state of Amapá, Brazil, the most ecologically preserved state in the country. In the study area, the aquatic ecosystem is under pressure from human activities such as, mining, hydroelectric power generation and urbanization, which contrast with the surrounding areas that are designated for biodiversity conservation. The aim of this study was to characterize the composition, frequency and richness of algae species and also to identify spatial-temporal patterns of taxa distribution. During the study period, we identified 185 taxa (136 species in 49 genera). The division Chlorophyta (class: Zygnematophyceae) presented the greatest number of taxa, whereas the division Rhodophyta accounted for only 1% of the taxa recorded. Most of the species identified (69%) were classified as sporadic in occurrence. The few taxa that were classified as common belonged mainly to the group Bacillariophyta. Species richness was greatest richness in the lentic stretches (in a reservoir) and in November (during the dry season). Of the 185 taxa identified, 174 are new records for the state of Amapá.
ISSN:	0102-3306 1677-941X 0102-3306
DOI:	10.1590/S0102-33062013000200011