Dinâmica da comunidade de macrófitas aquáticas no reservatório de Santana, RJ

Pitelli, R.L.C.M.; Toffaneli, C. M.; Vieira, E. A.; Pitelli, Robinson Antônio; Velini, Edivaldo Domingues

doi:10.1590/s0100-83582008000300001

Cited by 21 publications

(19 citation statements)

References 3 publications

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“…Nutrients are heterogeneously distributed in natural habitats (Jackson and Caldwell, 1993;Gross et al, 1995); however, human activities have increased availability of nutrients in some aquatic ecosystems creating conditions to the macrophytes cover the surface of many lakes, reservoirs, rivers and ponds (Thomaz et al, 2003;Wilson et al, 2005). There are several examples of proliferation of some macrophytes species in aquatic environments impacted and non-impacted by organic pollution (Pieterse and Murphy, 1990;Thomaz et al, 2005;Camargo et al, 2006;Pitelli et al, 2008). A recent study showed that the growth of Salvinia molesta Mitchell was approximately 12 times higher in a reservoir impacted by aquaculture effluent (high concentration of nitrogen and phosphorus) than in a non-impacted reservoir (Pistori et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Estimating nitrogen and phosphorus saturation point for Eichhornia crassipes (Mart.) Solms and Salvinia molesta Mitchell in mesocosms used to treating aquaculture effluent

Henares

Camargo

2014

Acta Limnol. Bras.

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Aim:To evaluate the growth of Eichhornia crassipes (Mart.) Solms and Salvinia molesta Mitchell in tanks used for treating aquaculture effluent and compare the results with literature data in order to estimate the nutrients saturation point. Methods: An experiment with six rectangular fiberglass tanks were separated in two treatments, inflow and outflow (higher and lower nutrient concentration), and the two macrophytes above cited was carried out during 50 days. A floating quadrat with 0.25 m 2 of E. crassipes and S. molesta at inflow and outflow of the tanks was collected weekly for fresh mass measurement. At the beginning and end of the experiment samples of macrophytes were oven-dried at 60 °C until constant weight to determine the dry mass. Dry mass of plants was estimated by a simple linear regression analysis between fresh mass and dry mass (DM). Results: The N and P concentrations were significantly higher (P<0.05) in the inflow (mean of 0.66 mg L -1 and 233.6 mg L -1 , respectively) than in the outflow of the tanks (mean of 0.38 mg L -1 and 174.7 mg L -1 , respectively). However, no significantly different plant growth was observed for either higher or lower concentration. For both higher and lower nutrient concentrations, the biomass gain for E. crassipes was, respectively, 428.5 and 402.7 g DM.m 2 . For S. molesta, biomass gain was 135.2 and 143.1 g DM.m 2 , in the higher and lower concentrations, respectively. Others studies reported high growth of E. crassipes and S. molesta in concentrations of nitrogen (0.14 -0.18 mg L -1 ) and phosphorus (14.2 -77.0 mg L -1 ) lower than this study. Conclusion: The comparison of E. crassipes and S. molesta growth in this study with others allow us to assume that the saturation point of E. crassipes should be 0.26 mg L -1 of nitrogen and 77 mg L -1 of phosphorus and for S. molesta below 0.19 mg L -1 of nitrogen and 15.1 mg L -1 of phosphorus.Keywords: aquatic macrophytes, nutrients, growth, freshwater prawn, effluents.Resumo: Objetivo: Avaliar o crescimento de Eichhornia crassipes (Mart.) Solms e Salvinia molesta Mitchell em tanques utilizados para o tratamento de efluente de aquicultura e comparar os resultados com dados da literatura a fim de estimar o ponto de saturação de nutrientes. Métodos: Um experimento com seis tanques retangulares divididos em dois tratamentos, entrada e saída (maior e menor concentração de nutrientes, respectivamente), e as duas macrófitas aquáticas citadas acima foi realizado durante 50 dias. Um quadrante de 0,25 m 2 com amostras de E. crassipes e S. molesta da entrada e da saída dos tanques foi coletado semanalmente para estimar a massa fresca das macrófitas. No início e no final do experimento amostras das macrófitas foram secas em estufa a 60 °C até peso constante para determinar a massa seca. A massa seca das macrófitas foi estimada por regressão linear simples entre a massa fresca e a massa seca (MS). Resultados: As concentrações de N e P foram significativamente (P<0.05) 2014, vol. 26, no. 4, p. 420 -428 421 Estimating nit...

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Section: Introductionmentioning

confidence: 99%

Estimating nitrogen and phosphorus saturation point for Eichhornia crassipes (Mart.) Solms and Salvinia molesta Mitchell in mesocosms used to treating aquaculture effluent

Henares

Camargo

2014

Acta Limnol. Bras.

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“…Maintaining macrophyte biodiversity improves the functioning of the ecosystem, increases the transparency of water and supporting fish production (Bakker et al, 2012). On the other hand, excessive macrophyte production has a number of implications for the multiple uses of reservoirs, for example, damaging hydropower generation and navigation (Pieterse & Murphy, 1993). These effects depend on the species, due to characteristics such as life form differences, the presence of propagules and generation time.…”

Section: Introductionmentioning

confidence: 99%

“…Many towns around the reservoir have no sewage treatment increasing the nutrient concentrations mainly in the dry season (Soares et al, 2008) contributing to the eutrophication and cyanobacteria bloom (CETESB, 2016). Aquatic macrophyte growth is closely related to the eutrophication causing concerns to the multiple uses of freshwater systems (Pieterse & Murphy, 1993). However few studies described this community in the Itupararanga Reservoir.…”

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confidence: 99%

“…Understanding macrophyte dynamics in reservoirs contributes to establishing biodiversity patterns and to managing this community (Martins et al, 2008;Pitelli et al, 2008;Ziegler et al, 2015). It is particularly relevant in the State of São Paulo due to the high number of reservoirs in the region, especially along the Tietê River, an important river that crosses the state and has six…”

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confidence: 99%

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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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“…Devido a esses problemas e ao alto custo do controle mecânico, várias investigações vêm sendo realizadas com o intuito de otimizar o processo ou mesmo encontrar alternativas para um possível manejo, como é o caso do controle químico e biológico. O controle químico vem sendo empregado em vários países, por promover resultado rápido e eficiente e por ser seguro para a vida animal quando utilizado dentro das recomendações técnicas (Cardoso et al, 2003;Pitelli et al, 2008;Henares et al, 2011). O controle mecânico, além do alto custo, promove o risco de coleta indevida de animais jovens e proporciona a dispersão de plantas com reprodução vegetativa (Mustafa et al, 2010).…”

Section: Introductionunclassified

Mapeamento do biovolume de plantas aquáticas submersas a partir de dados hidroacústicos e imagem multiespectral de alta resolução

Boschi¹,

Galo

Rotta³

et al. 2012

Planta daninha

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As plantas aquáticas têm papel fundamental no equilíbrio dos ecossistemas, porém seu crescimento desequilibrado pode obstruir canais, represas e reservatórios e afetar múltiplos usos da água. Em relação a plantas aquáticas submersas, a utilização de medidas de controle torna-se mais complexa, em face da dificuldade em mapear e quantificar volumetricamente as áreas colonizadas. Nessas situações, considera-se que o uso de dados hidroacústicos possibilite o mapeamento e a mensuração dessas áreas, auxiliando na elaboração de propostas de manejo sustentáveis desse tipo de vegetação aquática. Assim, o presente trabalho utilizou dados acústicos e a técnica de krigagem para realizar a inferência espacial do biovolume de plantas aquáticas submersas. Os dados foram obtidos em três levantamentos ecobatimétricos realizados em uma área de estudos localizada no rio Paraná, caracterizada por condições favoráveis para proliferação de vegetação aquática submersa e dificuldade de navegação. Para delimitar as áreas caracterizadas pela presença de plantas aquáticas submersas, utilizou-se uma imagem multiespectral de alta resolução espacial World View-2. O mapeamento do biovolume das plantas aquáticas submersas nas áreas de ocorrência do fenômeno foi realizado a partir da inferência do biovolume por krigagem e do fatiamento dos valores inferidos em intervalos de 15%. A partir do mapa gerado, foi possível identificar os locais de maior concentração de macrófitas submersas, com predominância de valores de biovolume entre 15-30% e 30-45%, confirmando a viabilidade da utilização da krigagem na inferência espacial do biovolume, a partir de medidas ecobatimétricas georreferenciadas e com o suporte de imagem de alta resolução espacial.

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Dinâmica da comunidade de macrófitas aquáticas no reservatório de Santana, RJ

Cited by 21 publications

References 3 publications

Estimating nitrogen and phosphorus saturation point for Eichhornia crassipes (Mart.) Solms and Salvinia molesta Mitchell in mesocosms used to treating aquaculture effluent

Estimating nitrogen and phosphorus saturation point for Eichhornia crassipes (Mart.) Solms and Salvinia molesta Mitchell in mesocosms used to treating aquaculture effluent

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

Mapeamento do biovolume de plantas aquáticas submersas a partir de dados hidroacústicos e imagem multiespectral de alta resolução

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