Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X0524
Acta Limnologica Brasiliensia
Original Article

Phytoplankton functional groups associated with the trophic state of tropical reservoirs

Grupos funcionais do fitoplâncton associados ao estado trófico de reservatórios tropicais

Simone Alves de Oliveira; Carla Ferragut; Carlos Eduardo de Mattos Bicudo

http://dx.doi.org/10.1590/S2179-975X0524 Acta Limnol. Bras. (Online), vol.36, e45, 2024
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Abstract

Aim: The study investigated functional groups representing reservoirs of different trophic states, identifying eutrophication indicators.

Methods: Water samples were collected to evaluate physical and chemical characteristics and the phytoplankton composition in five reservoirs during dry and rainy periods.

Results: Low concentration of dissolved nutrients (nitrite, orthophosphate, and total dissolved phosphorus) and total phosphorus described the oligotrophic and mesotrophic reservoirs, and the opposite for the eutrophic and hypertrophic reservoirs. Twenty-four functional groups were identified, eight of which were considered descriptors due to high biomass. Functional groups were influenced by the trophic state, and secondarily by seasonality. Typical functional groups represented the hypertrophic, eutrophic, and mesotrophic reservoirs. However, an oligotrophic reservoir was represented by a functional group commonly associated with environmental eutrophic.

Conclusions: The functional groups were representative of the trophic state of systems and detected signs of early eutrophication.

Keywords

Brazil, eutrophication, environmental factors, functional classification

Resumo

Objetivo: O estudo investigou grupos funcionais representativos de reservatórios com diferentes estados tróficos e avaliou a ocorrência dos que indicassem eutrofização.

Métodos: Amostras de água de cinco reservatórios foram coletadas para avaliar as características físicas e químicas e a composição do fitoplâncton durante os períodos de seca e chuva.

Resultados: Baixas concentrações de nutrientes dissolvidos (nitrito, ortofosfato e fósforo total dissolvido) e fósforo total descreveram os reservatórios oligotrófico e mesotrófico; e o oposto para os reservatórios eutrófico e hipertrófico. Vinte e quatro grupos funcionais foram identificados, oito dos quais foram considerados descritores de reservatório devido à alta biomassa. Os grupos funcionais foram influenciados pelo estado trófico e, secundariamente, pela sazonalidade. Grupos funcionais típicos representaram os reservatórios hipertrófico, eutrófico e mesotrófico. No entanto, o reservatório oligotrófico foi representado por um grupo funcional comumente associado à eutrofia ambiental.

Conclusões: Os grupos funcionais foram representativos do estado trófico dos sistemas e detectaram sinais de eutrofização precoce.

Palavras-chave

Brasil, eutrofização, fatores ambientais, classificação funcional

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Submitted date:
01/16/2024

Accepted date:
10/17/2024

Publication date:
12/09/2024

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