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Provedor de dados:  Anais da ABC (AABC)
País:  Brazil
Título:  Phytoplankton community of Reis lake in the Brazilian Amazon
Autores:  SILVA,ISE G.
MOURA,ARIADNE N.
DANTAS,ENIO W.
Data:  2013-06-01
Ano:  2013
Palavras-chave:  Phytoplankton
Nictemeral
Floodplain
Seasonal
State of Roraima
Resumo:  Reis Lake is located in the municipality of Caracaraí, state of Roraima (Brazil) and is subject to fluctuations in water level. The aim of this study was to analyze the structure of the phytoplankton community on the nictemeral and seasonal scales and determined the influence of limnological variables. Sampling was performed in the rainy season (June/2006) and dry season (November/2006), considering two nictemeral cycles. The phytoplankton community was assessed with regard to composition and density, abiotic variables were analyzed simultaneously. The lake had low concentrations of oxygen, clinograde profile and water stratified during the day and homogenous at night, with low concentrations of nutrients and waters ranging from slightly acidic to alkaline. The phytoplankton was represented by 43 taxa, 35 species in the dry season and 29 species in the rainy season. Low densities of phytoplankton occurred in both nictemeral cycles, with accentuated vertical gradient. The highest densities were recorded in the dry season. Reis Lake exhibits characteristics that classify it as a polymythic and oligotrophic environment. The variability in the data was more important seasonally than on the nictemeral scale, supporting the hypothesis of the influence of the hydrological cycle on the dynamics of phytoplankton communities in floodplain lakes.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200649
Editor:  Academia Brasileira de Ciências
Relação:  10.1590/S0001-37652013000200012
Formato:  text/html
Fonte:  Anais da Academia Brasileira de Ciências v.85 n.2 2013
Direitos:  info:eu-repo/semantics/openAccess
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