Submerged Macrophytes, Phytoplankton and Zooplankton in Tropical Reservoir

Cacilda Michele Cardoso Rocha, Débora Maciel B. Lima, Maristela Casé Costa Cunha, Jarcilene Silva Almeida

Resumo


Submerged macrophytes, zooplankton and phytoplankton surround reservoirs are still need knowledge about ecology and influence in water quality in reservoirs of America Latina. The control of the biomass formation, low nutrient loadings, algal growth and diversity are key points to acquire water quality. We investigated evidences of submerged macrophytes enhance water quality and planktonic assemblages in two bays surround reservoir. Samples for water transparency, nutrients (phosphorus and nitrogen mg/L-1), phytoplankton, and zooplankton were collected between littoral with macrophytes and limnetic areas. Analyses with Standard Protocols were applied to make comparisons of these parameters. Our data show both bays are Eutrophized, the Secchi disk value was high (3.8 and 3.9 m), low concentration of phosphorus (means= 0.03 and 0.05 mg/L-1) and nitrogen (0.4 and 0.9 mg/L-1). Chlorophyll-a exhibited high biomass formation during the dry period (49 and 61 μg/ L-1). Egeria densa cover a wide range in littoral areas (66% and 40%). Phytoplankton was represented by 13 species, including Cyanophyta (5,292 to 717 cell /mL-1) in high densities. Zooplankton comprised 77 species of Rotifera, 18 of Cladocera and three Copepoda, and densities varied between 3,711 and 2,232 org.m-3 in the littoral areas. The Re-oligotrophication and restoration of these bays can be used combining biological methods knowledge and technical experimentation. New approaches to adapted management measures to advance research and to improve water quality is a next step in a near future of reservoirs from Northeast Brazil.

 

RESUMO

O conhecimento sobre a ecologia e influência da macrófitas submersas, zooplâncton e fitoplâncton na qualidade da água ainda é insipiente em reservatórios da América Latina. O controle da formação de biomassa, crescimento algal, baixa carga de nutrientes, e a diversidade são pontos-chave. Investigamos evidências do papel das macrófitas submersas na qualidade da água e assembleias planctônicas em duas baías formadas de um reservatório. Amostragem para análises da transparência da água, nutrientes (fósforo e nitrogênio mg / L-1), fitoplâncton e zooplâncton (riqueza e densidades) foram coletadas entre áreas litorâneas com macrófitas e na limnética. Análises foram realizadas com protocolos padrão para comparações desses parâmetros entre as baías. A transparência foi alta (médias de 3.8 e 3.9 m), baixa concentração do fósforo (médias = 0.03 e 0.05 mg / L-1) e nitrogênio (0.4 e 0.9 mg / L- 1), ambas as baías estão eutrofizadas. A Chlorofila-a teve alta biomassa (49 e 61 μg/ L-1). Egeria densa cobre amplas áreas no litoral (66% e 40%), a riqueza do fitoplâncton incluiu 13 espécies, das quais Cyanophyta (5,292 a 717 células / mL-1) em altas densidades. O zooplâncton incluiu espécies Rotifera, Cladocera e Copepoda (77; 18; 03). As densidades do zooplâncton foram altas (3,711 e 2,232 org.m-3) no litoral. A oligotrofia e restauração das baías podem ser adquiridas combinando conhecimento sobre métodos biológicos e experimentação técnica. Novas abordagens e medidas de manejo para avançar nas pesquisas da água em reservatórios são o futuro e consiste no próximo passo no Nordeste do Brasil.

Palavras-chave: Qualidade da água, interações tróficas, Brasil, Semi-árido, Rio São Francisco.


Palavras-chave


INNOVATE, Trophic interactions, Water quality, São Francisco River, Semi-arid

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DOI: https://doi.org/10.26848/rbgf.v13.5.p%25p

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Revista Brasileira de Geografia Física - ISSN: 1984-2295

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