Composition of the phytoplankton community in the Apodi-Mossoró River estuary, Brazilian semi-arid
Journal Title: Revista Verde de Agroecologia e Desenvolvimento Sustentável - Year 2017, Vol 12, Issue 2
Abstract
The objective was to characterize the structure of the phytoplankton community as well as the main abiotic variables of the Apodi-Mossoró estuary, Rio Grande do Norte, Brazil. Monthly collections were carried out during high tides of syzygy and analyzes of abiotic and biotic variables from July 2004 to August 2005 in three points (estuary, middle estuary and upper estuary). The means were calculated for each collection season and seasonal period, in addition to the community attributes: richness, diversity and equitability. For the identification of the main factors responsible for the data variance, the Principal Component Analysis was performed and the variations in the phytoplankton abundance were evaluated using the Correspondence Analysis and Canonical-Correlation Analysis. The Apodi-Mossoró River estuary is a thermally stable tropical ecosystem, influenced by the seasonality of drought and rainy periods. Its predominant salinity regime is euhaline, which can vary from oligohaline to hypersaline as a function of water balance, and its pH is predominantly alkaline. This environment can be considered oligotrophic and well oxygenated. The phytoplankton community of the estuary consisted of 109 infrageneric taxa, belonging to five distinct groups, with Bacilallariophyta showing the greatest contribution, both in the qualitative aspect (62%) and in the quantitative aspect (74%). Wealth and diversity were higher in 2004, as well as in the dry season, with decreasing trends depending on the distance from the mouth, and according to community attributes, this richness is well distributed but low in diversity.
Authors and Affiliations
Rogério Taygra Vasconcelos Fernandes, Jônnata Fernandes de Oliveira, José Luís Costa Novaes, Rodrigo Fernandes, Rodrigo Silva da Costa
Keywords
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- EP ID EP253882
- DOI 10.18378/rvads.v12i2.4592
- Views 92
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