Acta Limnologica Brasiliensia
https://app.periodikos.com.br/journal/alb/article/doi/10.1590/S2179-975X11419
Acta Limnologica Brasiliensia
Original Article

Phytoplankton richness and abundance in response to seasonality and spatiality in a tropical reservoir

Riqueza e abundância fitoplanctônica em resposta à sazonalidade e espacialidade em um reservatório tropical

Lyza Christine dos Santos Moura; Silvia Moreira dos Santos; Cláudia Alves de Souza; Carlos Roberto Alves dos Santos; Jascieli Carla Bortolini

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Abstract

Abstract:: Aim: Species richness and abundance are important elements in understanding communities’ dynamics. In this way we evaluated the spatial and temporal variation of phytoplankton richness and density in a tropical reservoir, and its main drivers. We tested whether the temporal variability of the hydrological cycle influences the phytoplankton, in addition to testing the main environmental variables that influence richness and density.

Methods: Data from environmental variables and phytoplankton were sampled in different regions of João Leite reservoir, Goiás, Brazil, during a dry and rainy period, and were analyzed by Principal Component Analysis, Student's t-test and Bioenv.

Results: We recorded distinct environmental scenarios between the dry and rainy period, with temporal differences in richness. Sixty-two taxa were recorded, with cyanobacterial predominance in both hydrological periods and in the lentic reservoir regions. Water temperature, pH, electrical conductivity, dissolved oxygen, turbidity, and nutrient concentrations were the main drivers of phytoplankton richness and density in our study.

Conclusions: The richness and abundance of species directly reflect the determining factors in the structure of communities, generating important information about ecosystem functions. Therefore, understanding the environmental variability on phytoplankton richness and abundance in tropical reservoirs is essential, since the construction of reservoirs influences aquatic biodiversity and the provision of ecosystem services.

Keywords

Brazil, dam, diversity, impoundment, planktonic algae

Resumo

Resumo:: Objetivo: A riqueza e abundância de espécies são elementos importantes no entendimento da dinâmica das comunidades. Dessa forma, nós avaliamos a variação espacial e temporal da riqueza e densidade do fitoplâncton em um reservatório tropical e os seus principais direcionadores. Nós testamos se a variabilidade temporal do ciclo hidrológico influencia o fitoplâncton, além de testar as principais variáveis ambientais que influenciam a riqueza e a densidade.

Métodos: Dados de variáveis ambientais e do fitoplâncton foram amostrados em diferentes regiões do reservatório João Leite, Goiás, Brasil, durante períodos de seca e chuva, e foram analisados por meio de Análise de Componentes Principais, teste-t de Student e Bioenv.

Resultados: Nós registramos cenários ambientais distintos entre os períodos de seca e chuva, com diferenças temporais na riqueza. Sessenta e dois táxons foram registrados, com predominância de cianobactérias em ambos os períodos hidrológicos e nas regiões lênticas do reservatório. Temperatura da água, pH, condutividade elétrica, oxigênio dissolvido, turbidez e concentrações de nutrientes foram os principais direcionadores da riqueza e densidade fitoplanctônica em nosso estudo.

Conclusões: A riqueza e abundância de espécies refletem diretamente os fatores determinantes na estrutura das comunidades, gerando informações importantes sobre as funções do ecossistema. Portanto, o entendimento da variabilidade ambiental sobre a riqueza e abundância do fitoplâncton em reservatórios tropicais é essencial, uma vez que a construção de reservatórios influencia a biodiversidade aquática e o provimento de serviços ecossistêmicos.
 

Palavras-chave

Brasil, barragem, diversidade, represamento, algas planctônicas

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Publication date:
06/04/2021

60ba7615a953955d8a5b2f83 alb Articles
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