Variação sazonal dos grupos funcionais fitoplanctônicos em braços de um reservatório tropical de usos múltiplos no estado de São Paulo (Brasil)

Cunha, Daví Gasparini Fernandes; Calijuri, Maria do Carmo

doi:10.1590/s0102-33062011000400009

Cited by 26 publications

(28 citation statements)

References 37 publications

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“…Positive correlation between pH and phytoplankton has also been found in studies of Dantas et al (2008) and Cunha and Calijuri (2011). The seasonal variation of pH can be explained by the increased consumption of CO 2 during the summer (Palma et al 2010).…”

Section: Discussionmentioning

confidence: 60%

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Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil)

Oliveira¹,

Ara

Moreira

et al. 2014

An. Acad. Bras. Ciênc.

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This study investigated the water quality in an urban eutrophic reservoir in Northeastern Brazil, considering the influence of seasonality. Monthly, samples were collected in the sub-surface reservoir. The following abiotic variables were analyzed: temperature, pH, dissolved oxygen, apparent color, turbidity, conductivity, fluoride, total nitrogen, chlorides, total dissolved solids, total hardness, iron, copper, manganese, aluminum, chlorophyll-a and phaeophytin. Total and thermotolerant coliforms were analyzed according to APHA (2012). Cyanobacteria density was quantified through its biomass. The data were analyzed using one-way ANOVA and Pearson correlation test. Higher values mean phytoplankton biomass (26.3mm 3 .L -1 ) occurred in the dry season, especially Planktothrix agardhii and Geiterinema amphibium, which occurred in 100% of samples. High trophic state index was detected throughout the year. Seasonality exerted some influence on both biotic and abiotc variables, leading to changes in water quality of the reservoir.

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Section: Discussionmentioning

confidence: 60%

“…Inverse relationships between transparency of water and biomass of phytoplankton have been reported (Moura et al 2007b, Chellapa et al 2009, Costa et al 2009, Cunha and Calijuri 2011. Some works indicate a dominance of P. agardhii in periods with less luminosity and higher turbidity (Chellapa et al 2009, Kokocinski et al 2010, 2012.…”

Section: Discussionmentioning

confidence: 96%

Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil)

Oliveira¹,

Ara

Moreira

et al. 2014

An. Acad. Bras. Ciênc.

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“…In Brazil, studies on phytoplankton in short sampling intervals (24 hours cycle) have been carried out with his approach (Araújo et al, 2000;Barbosa, 2002;Melo and Huszar, 2000;Nabout and Nogueira, 2007;Becker et al, 2009;Barbosa et al, 2011;Cunha and Calijuri, 2011;Cruz, 2011;Dantas et al, 2009;Dantas et al, 2011). Natural coastal lagoons in Rio Grande do Norte systems are important, especially when using as water supply for the city of Natal, as in Extremoz Lake (Raposo and Gurgel, 2003).…”

Section: Introductionmentioning

confidence: 99%

Diel dynamic of phytoplankton functional groups in a tropical water supply, Extremoz Lake, northeastern Brazil

Pinto

Becker

2014

Acta Limnol. Bras.

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Aim: This study analyzed -the diel and vertical dynamics of phytoplankton functional groups in a natural tropical lake (Extremoz Lake, northeast Brazil), to investigate and understand the driver factors of the community during a severe drought period. Methods: Sampling of the abiotic variables and phytoplankton was performed at intervals of 6 hours over 24 hours in vertical profiles, in dry and rainy seasons (according to the historical average). The phytoplankton species were grouped according to the functional groups' approach sensu Reynolds et al. (2002). Results: October/12 was considered as a dry period (18.4 mm), while March/13, due to the historical average, as a rainy season, due to the low rainfall during the study period (15.7 mm), it was called severe drought. The lake showed thermal and chemical destratification in both periods. Phytoplankton biomass was higher in the dry season and their vertical distribution was stratified in both periods. In both samplings there were less algal biomass during the night. Phytoplankton functional groups of mixed and shallow systems (S 1 , L 0 and K) were descriptors throughout the study period with higher biomass always registered in the group S 1 , represented by Planktolyngbya limnetica (Cyanobacteria) Conclusion: The lack of seasonality observed in this study, due to prolonged drought, may have influenced the pattern of homogeneous behavior in both samplings. This pattern strongly influenced the vertical distribution of phytoplankton in the two periods, with a constancy of dominance of functional descriptors groups.Keywords: shallow lake, vertical distribution, cyanobacteria, functional groups.Resumo: Objetivo: O nosso trabalho teve como objetivo avaliar a dinâmica nictemeral e vertical dos grupos funcionais fitoplanctônicos em uma lagoa natural tropical (Lagoa de Extremoz, nordeste do Brasil), para investigar e compreender os fatores direcionadores da comunidade em um período de seca severa. Métodos: As amostragens das variáveis abióticas e do fitoplâncton foram realizadas a intervalos de 6 horas ao longo de um ciclo de 24 horas em perfis verticais nas estações de seca e chuva. As espécies fitoplanctônicas foram agrupadas de acordo com a abordagem de grupos funcionais sensu Reynolds et al. (2002). Resultados: O mês de outubro/12 foi caracterizado como período seco (18,4 mm), enquanto que março/13, pela média histórica era caracterizado período chuvoso, devido a baixa precipitação no período de estudo (15,7 mm), foi denominado seca severa. A lagoa apresentou desestratificação térmica e química em ambos períodos. A biomassa do fitoplâncton foi maior na estação seca e a distribuição vertical da mesma foi estratificada em ambas os períodos. Em ambas as amostragens houve menor biomassa algal nos períodos noturnos. Grupos funcionais fitoplanctônicos típicos de ambientes rasos e misturados (S 1 , L 0 e K) foram descritores durante todo o período do estudo, com maior biomassa registrada sempre no grupo S 1 , representado pela Planktolyngbya limnetica (Cyanobac...

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“…However, the low similarity suggests that the Itupararanga Reservoir is a heterogeneous ecosystem supporting the growth of different species contributing to biological diversity. Despite the low spatial variation of the physical and chemical variables, some recent studies (Cunha & Calijuri, 2011b;Bottino et al, 2013) reported that the main factors related to the spatial heterogeneity of ) at different sampling sites of the Itupararanga Reservoir in two seasons (summer and winter) in 2010. There were no measurements in the sampling sites with absence of macrophytes (in the winter P6, P7 and P9).…”

Section: Discussionmentioning

confidence: 99%

“…Considering that an increase in nutrients is common during this period in the study area (Cunha & Calijuri, 2011b) and that the electrical conductivity may be considered an indirect measure of the concentrations of nutrients dissolved in the water (Cometti et al, 2008), an increase in this variable in the winter allowed us to suppose that the trophic status influenced the biomass of E. crassipes in the winter.…”

Section: Discussionmentioning

confidence: 99%

Richness and distribution of aquatic macrophytes in a subtropical reservoir in São Paulo, Brazil

et al. 2017

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Aims: to evaluate the richness, biomass and distribution of aquatic macrophytes in a subtropical reservoir in the dry and rainy seasons. Methods: this study was carried out in the Itupararanga Reservoir, an important water source in São Paulo State, undergoing a continuous process of eutrophication. Samples of macrophytes were collected at 12 sampling sites in the summer and at 9 sampling sites in the winter in the Itupararanga Reservoir using the quadrat method (0.25 m 2 ). In the laboratory, the plants were washed to remove the coarse material and then were dried (60 °C) for biomass determination (gDW. m -2). All the species in the sampling sites in both periods were identified using the specific literature. In each sampling site, the water temperature, pH, electrical conductivity and dissolved oxygen were measured using a probe. The temporal and spatial differences were analyzed using t-test and a Cluster Analysis was performed. Results: The checklist showed sixteen species, 75% of them were emergent. From the 16 species, 15 were present in the summer and 10 in the winter. Eichhornia crassipes, Polygonum sp., and Urochloa sp. were the frequent taxa and had the highest biomass in both periods. The winter showed the highest biomass mainly due to the growth of free-floating species. The headwaters of the reservoir, the most eutrophic region, showed that the highest macrophyte richness and the sampling sites of this area were clustered in both the summer and winter. Conclusions: There was no significant spatial variation among the measured variables. E. crassipes, Salvinia sp. and Urochloa sp. showed a significant variation of biomass between two periods. Urochloa sp. is a nuisance species occurring in up to 60% of the sampling sites having implications for the whole catchment. Continuous macrophyte monitoring is important due to the increasing trophic status of this ecosystem.

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Variação sazonal dos grupos funcionais fitoplanctônicos em braços de um reservatório tropical de usos múltiplos no estado de São Paulo (Brasil)

Cited by 26 publications

References 37 publications

Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil)

Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil)

Diel dynamic of phytoplankton functional groups in a tropical water supply, Extremoz Lake, northeastern Brazil

Richness and distribution of aquatic macrophytes in a subtropical reservoir in São Paulo, Brazil

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