Structure of the phytoplankton community in the Cachoeira Dourada reservoir (GO/MG), Brazil

Oliveira, Márcia Teixeira de; Peret, Alberto Carvalho

doi:10.1590/s1519-69842011000400003

Cited by 14 publications

(3 citation statements)

References 33 publications

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“…Such changes may be caused by variations in nutrient availability, changes in water retention time and light availability Nogueira, 2000;Borges et al, 2008;Teixeira de Oliveira et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Influence of fish farming in net cages on phytoplankton structure: a case study in a subtropical Brazilian reservoir

2014

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This study investigated the enrichment influence due to fish farming in net cages on the phytoplankton composition, density and diversity in two arms of a subtropical reservoir (Salto Caxias, Paraná). There were no statistically significant differences in the phytoplankton composition and diversity, as well as for concentrations of nutrients among the handled treatment. The density values were higher during the summer. Richness and Shannon diversity values were low during the study period. The equitability values were high during the winter and low in the summer. Variations of phytoplankton community and nutrients were mainly influenced by seasonality. The absence of significant differences between the treatments was probably due to the small number of net cages and fish used, as well as to the hydrodynamics of the studied environments, which are influenced by upstream rivers inflows.Keywords: phytoplankton, community structure, net cages, hydrodynamics's effect.Influência do cultivo de peixes em tanques-rede sobre a estrutura do fitoplâncton: estudo de caso em um reservatório subtropical brasileiro ResumoEste estudo investigou os efeitos do enriquecimento devido ao cultivo de peixes em tanques-rede sobre a composição, densidade e diversidade fitoplanctônica em dois braços de um reservatório subtropical (Salto Caxias, Paraná). Não foram registradas diferenças significativas para a composição e diversidade fitoplanctônica e para as concentrações de nutrientes entre os tratamentos utilizados. A densidade foi maior durante o verão. Os valores de riqueza de espécies e diversidade de Shannon foram baixos durante todo o período de estudo. A equitabilidade foi elevada no inverno e baixa no verão. As variações da comunidade fitoplanctônica e dos nutrientes parecem ter sido influenciadas principalmente pela sazonalidade. A ausência de diferenças significativas entre os tratamentos, provavelmente se devem ao pequeno número de tanques e peixes utilizados, e à hidrodinâmica dos ambientes estudados, os quais são influenciados pelos influxos dos rios à montante.Palavras-chave: fitoplâncton, estrutura da comunidade, tanques-rede, efeitos da hidrodinâmica.

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Section: Introductionmentioning

confidence: 99%

Influence of fish farming in net cages on phytoplankton structure: a case study in a subtropical Brazilian reservoir

2014

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“…For Jucazinho and Carpina reservoirs, the theoretical hydraulic retention time is about 401 days and 109 days, respectively. Short residence times cause biomass loss by hydraulic washout and mechanical shock in phytoplankton cells (TEIXEIRA DE OLIVEIRA et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

<b>Cyanobacteria community in two tropical eutrophic reservoirs in northeastern Brazil

Oliveira

Silva

Costa

et al. 2015

Acta Sci. Biol. Sci.

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ABSTRACT. This study investigated the effect of seasonality on the Cyanobacteria community in two tropical eutrophic reservoirs in northeastern Brazil. Monthly samplings were conducted in the sub-surface of reservoirs. The following abiotic variables were analyzed: apparent color, turbidity, conductivity, alkalinity, calcium, magnesium, sodium, potassium, sulfate, total phosphorous, ammonia, nitrate, nitrite, chlorides, total hardness and chlorophyll-a, according to APHA (2012). Cyanobacteria density was quantified through biomass. Data were analyzed using one-way ANOVA and Redundancy Analysis (RDA). Higher mean values of Cyanobacteria biomass occurred in the dry (9.9mm ) season in Jucazinho and Carpina reservoirs, respectively, especially Planktothrix agardhii, Cylindrospermopsis raciborskii and Geiterinema amphibium, which occurred in 100% of the samples. RDA analysis revealed that the variables nitrite, ammonia, conductivity, calcium, sulfate, chlorides and alkalinity influenced most the Cyanobacteria community in both reservoirs. High trophic state index was observed throughout the year. Seasonality affected both biotic and abiotic variables.Keywords: abiotic parameters, phytoplankton, seasonality.Comunidade de cianobactérias em dois reservatórios eutróficos e tropicais no nordeste do Brasil RESUMO. Este estudo investigou o efeito da sazonalidade sobre a comunidade de cianobactérias em dois reservatórios eutróficos tropicais no nordeste do Brasil. Mensalmente, amostras foram coletadas na subsuperfície dos reservatórios. Foram analisados os seguintes fatores abióticos: cor aparente, turbidez, condutividade, alcalinidade, cálcio, magnésio, sódio, potássio, sulfato, fósforo total, amônia, nitrato, nitrito, cloretos, dureza total e clorofila-a, de acordo com APHA (2012). A densidade de cianobactérias foi quantificada por meio de sua biomassa. Os dados foram analisados usando Anova (one-way) e Análise de Redundância (RDA). Maiores valores médios de biomassa de cianobactérias ocorreram na estação seca (9,9 mm ) nos reservatórios de Jucazinho e Carpina, respectivamente, especialmente Planktothrix agardhii, Cylindrospermopsis raciborskii e Geitlerinema amphibium que ocorreram em 100% das amostras. A análise de RDA revelou que os parâmetros nitrito, amônia, condutividade, cálcio, sulfato, cloretos e alcalinidade foram mais influentes na comunidade de Cyanobacteria em ambos os reservatórios. Elevado índice de estado trófico foi detectado durante todo o ano. A sazonalidade exerceu influência tanto nas variáveis bióticas como abióticas.Palavras-chave: parâmetros abióticos, fitoplâncton, sazonalidade.

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“…Despite several studies on the ecology of phytoplankton in tropical and subtropical reservoirs (Silva et al, 2005;Fonseca and Bicudo, 2011;Teixeira de Oliveira et al, 2011;López et al, 2012;Dantas et al, 2012;Hu et al, 2013), few have focused on the effects of fish farming in net cages on phytoplankton community. These effects are directly dependent on the magnitude of the production system and environment carrying capacity.…”

Section: Introductionmentioning

confidence: 99%

Response of phytoplankton to an experimental fish culture in net cages in a subtropical reservoir

et al. 2016

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This study aimed to evaluate nutrients concentration and spatial-temporal changes in phytoplankton biovolume during an experimental fish culture in net cages in a lateral arm of Salto Caxias reservoir, Brazil. Two sampling stations were placed in the affected lateral arm and other two in a cageless lateral arm. Neither abiotic variables nor phytoplankton biovolume presented significant differences between the treatments. Only temporal changes were confirmed by the analysis performed. Both lateral arms were classified as oligotrophic, reflecting low influence of the net cages. Phytoplankton growth seems to be limited by nitrogen. Biovolume values were, in general, low and five major functional groups were recognized (E, F, G, K and P). In summer higher biovolume values were observed and representatives of Chlorophyceae and Cyanobacteria belonging to the functional groups F and K, respectively, were the most important. In winter phytoplankton was mainly composed by Bacillariophyceae taxa from P group. G group was also restricted to winter and E group occurred in winter and summer. The variations recorded in phytoplankton structure appear to have been mainly influenced by seasonal changes in temperature, precipitation and nutrients availability. The effects of net cages on the abiotic variables and phytoplankton biovolume appear to have been small, probably due to the small number of net cages employed and the system dilution capacity. However, a permanent monitoring of phytoplankton is recommended, since this environment has a carrying capacity, from which the trophic state may increase.Keywords: biovolume, environment impact, fish cultivation, functional groups, nutrients concentration. Resposta do fitoplâncton ao cultivo experimental de peixes em tanques-rede em um reservatório subtropical ResumoEste estudo objetivou avaliar alterações nas variáveis abióticas e no biovolume fitoplanctônico durante o cultivo experimental de peixes em tanques-rede em um braço lateral do reservatório de Salto Caxias, Brasil. Foram selecionadas duas estações de amostragem no braço com tanques-rede e outras duas em um braço sem tanques. As variáveis abióticas e o biovolume fitoplanctônico não apresentaram diferenças significativas entre os locais estudados. Apenas mudanças temporais foram confirmadas pelas análises utilizadas. Os dois braços laterais foram classificados como oligotróficos, refletindo a baixa influência dos tanques-rede. O crescimento do fitoplâncton parece ter sido limitado principalmente por nitrogênio. Os valores de biovolume foram, em geral, baixos e cinco principais grupos funcionais foram observados (E, F, G, K e P). No verão, os maiores valores de biovolume foram observados e representantes de Chlorophyceae e Cyanobacteria dos grupos funcionais F e K, respectivamente, se destacaram. No inverno, o fitoplâncton foi composto principalmente por táxons de Bacillariophyceae do grupo P. O grupo G também foi restrito ao inverno e o grupo E ocorreu no inverno e verão. As variações registradas na estrutura do fit...

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Structure of the phytoplankton community in the Cachoeira Dourada reservoir (GO/MG), Brazil

Cited by 14 publications

References 33 publications

Influence of fish farming in net cages on phytoplankton structure: a case study in a subtropical Brazilian reservoir

Influence of fish farming in net cages on phytoplankton structure: a case study in a subtropical Brazilian reservoir

<b>Cyanobacteria community in two tropical eutrophic reservoirs in northeastern Brazil

Response of phytoplankton to an experimental fish culture in net cages in a subtropical reservoir

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