Observations on aquatic Macrophyte Dynamics In the Reservoir Of The Balbina Hydroelectric Powerplant, Amazonas State, Brazil

Walker, Ilse; Miyai, R.; Melo, Miranda de

doi:10.1590/1809-43921999292265

Cited by 21 publications

(19 citation statements)

References 5 publications

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“…This fact certainly affected algal periphyton growth. Despite U. foliosa have wide distribution and high density in tropical reservoirs (Walker, 2004), the primary production may be reduced non-algal periphyton N andP (Francoeur et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

Seasonal variability of periphyton nutrient status and biomass on artificial and natural substrates in a tropical mesotrophic reservoir

Ferragut¹,

Rodello²,

Bicudo³

2010

Acta

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Aim: Study aimed at evaluating the periphytic community seasonal variation, nutrient status and biomass on artificial and natural (Nymphaea spp., Utricularia foliosa Linnaeus) substrates at a shallow mesotrophic reservoir (Ninféias Reservoir) located in the Parque Estadual das Fontes do Ipiranga, São Paulo, southeast Brazil; Methods: Samplings for physical, chemical and biological characteristics was performed in winter (August-2006), spring (October-2006), summer (January-2007) and autumn (April-2007). Periphyton was collected growing on artificial (microscope glass slides, 28 days colonization) and natural substrate (Nymphaea spp. and Utricularia foliosa). Periphyton attributes studied were: chlorophyll a, dry mass, ash free dry mass, and N and P content; Results: During the study period was recorded the highest values of water transparency and DO in the winter, PO 4 -P and free CO 2 in the spring, temperature and phytoplankton biomass in summer and autumn of DIN. The highest biomass values were recorded in winter and autumn. Periphyton P and N content varied seasonally on the substrates. Nymphaea spp. had the highest periphyton P content in summer, while U. foliosa and artificial substrate presented in the spring. Higher periphyton N content in Nymphaea spp., U foliosa and artificial substrate was recorded in the spring, winter and autumn, respectively. Periphyton and water ratio N: P molar indicated P-limitation, except the water in the spring (N-limitation). Conclusion: Periphyton N and P content and biomass variation was controlled by the seasonal scale. However, the microhabitat type seems to influence the periphyton nutrient status, especially in low nutrient availability in the environment.Keywords: biomass, natural and artificial substrates, nutrient status, periphyton.Resumo: Objetivo: Estudo avaliou a variação sazonal do estado nutricional e biomassa da comunidade perifítica em substrato artificial e natural (Nymphaea spp. e Utricularia foliosa Linnaeus) em reservatório mesotrófico raso (Reservatório das Ninféias, Parque Estadual das Fontes do Ipiranga, São Paulo, Brasil); Métodos: A amostragem das variáveis físicas, químicas e biológicas foi realizada no inverno (agosto-2006), primavera (outubro-2006), verão (janeiro-2007) e outono (abril-2007). O perifíton foi coletado de substrato artificial (lâminas de vidro, 28 dias de colonização) e do pecíolo de macrófitas aquáticas U. foliosa e Nymphaea spp.). Os atributos estudados do perifíton foram: clorofila a, massa seca, massa seca livre de cinzas e conteúdo de N e P; Resultados: No período de estudo foram registrados os maiores valores de transparência da água e OD no inverno, de P-PO 4 e CO 2 livre na primavera, temperatura e biomassa fitoplanctônica no verão e de NID no outono. Os maiores valores de biomassa foram registrados no inverno e no outono. O conteúdo de P e N do perifíton variou sazonalmente em todos os substratos. O maior conteúdo de P foi observado em Nymphaea spp. no verão, em U. foliosa e substrato artificial na primavera. O...

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Section: Discussionmentioning

confidence: 99%

Seasonal variability of periphyton nutrient status and biomass on artificial and natural substrates in a tropical mesotrophic reservoir

Ferragut¹,

Rodello²,

Bicudo³

2010

Acta

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“…Most of the large rivers in South America are now regulated by dams (Agostinho et al, 2008), and colonization by aquatic plants is common in Brazilian reservoirs (e.g., Walker et al, 1999;Marcondes et al, 2003;Thomaz et al, 2003;Lolis and Thomaz, 2011). This is the case of Ludwigia sedoides (Humb.…”

Section: Introductionmentioning

confidence: 99%

Morphometric and biotic variables as potential predictors ofLudwigia sedoides(Humb. & Bonpl.) Hara in a large Amazonian reservoir

Barbosa

Kobayashi

Pelicice

2014

Ann. Limnol. - Int. J. Lim.

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-Reservoirs cause hydrological changes (i.e., water level stabilization) that favor the colonization of aquatic macrophytes. Knowing the ecological factors that determine the occurrence of these plants is critical for water management (e.g., plant control) and biodiversity conservation. In this sense, the present study investigated colonization patterns of Ludwigia sedoides in Lajeado reservoir (Tocantins River, Amazon Basin), in order to identify variables that influence colonization at habitat scale. We investigated the relationship between colonization (coverage area and occurrence) and morphometric (fetch, slope, depth and distance from shoreline) and biotic variables (local diversity of macrophytes and co-occurrence patterns). Stepwise regression selected fetch, depth and slope as the best variables to explain the variation in L. sedoides coverage, which together explained 46% of data variability. Fetch and slope were negatively correlated with coverage, whereas depth showed a positive correlation. No biotic variable was included in the model (P > 0.05). However, the investigation of the geometric shape of bivariate correlations (null models) showed positive relationships with local species richness and richness of life forms (i.e., submerged, emergent, floating and epiphytic). In addition, an analysis of species co-occurrence (C-score) revealed that L. sedoides is negatively associated with some macrophyte species. We believe, however, that these results may be associated with species preferences for particular environmental conditions. In conclusion, the present study indicated that morphometric variables are potential predictors of the colonization of L. sedoides in Lajeado reservoir. Sheltered sites with low slope and moderate depths represent favorable environment for colonization and growth.

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“…This often involves early development of floating species, in response to nutrient increases in the water column, followed by the development of a more-structured submerged community (Machena, 1989). Fast growths of floating plants, such as that observed in Itaipu following the water level recovery have been described during the filling phase of several tropical reservoirs (e.g., Esteves, 1998;Talling & Lemoalle, 1998;Walker et al, 1999;.…”

Section: Discussionmentioning

confidence: 98%

Effect of reservoir drawdown on biomass of three species of aquatic macrophytes in a large sub-tropical reservoir (Itaipu, Brazil)

et al. 2006

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The biomass and maximum depth of colonization (Z max ) of Egeria najas Planchon (submerged), and the biomass and area covered by a stand of Eichhornia crassipes (Mart.) Solms and Salvinia herzogii Raddi (floating species) were assessed to measure the effects of a 5 m drawdown in water level of the Itaipu Reservoir (Brazil-Paraguay), which lasted about 3 months. The frequency of occurrence of the two first species, and of Salvinia spp was also assessed in the main arms of the reservoir. A conspicuous decrease of E. najas biomass was observed and this attribute did not reach the previous values even 10 months after the water level had returned to normal. Rapid growth of free-floating species (surface t doub = 2.9 and 3.2 days for total biomass of S. herzogii and E. crassipes, respectively, and 2.3 days for surface area covered by both species) was recorded immediately after the water level returned to normal. This fast growth was related to phosphorus increases in water. A clear succession was observed over a period of 103 days, during which S. herzogii was slowly substituted by E. crassipes. The effects of water level drawdown were also observed on E. najas frequency, given that this species occurred in 38% of the stands investigated before the water drawdown, but in only 9 and 6% of stands following 1 and 10 months of water level recovery, respectively. Water drawdown did not affect the frequency of occurrence of the floating species, which remained approximately constant, and lower than 15% in several of the reservoir arms investigated.

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Observations on aquatic Macrophyte Dynamics In the Reservoir Of The Balbina Hydroelectric Powerplant, Amazonas State, Brazil

Cited by 21 publications

References 5 publications

Seasonal variability of periphyton nutrient status and biomass on artificial and natural substrates in a tropical mesotrophic reservoir

Seasonal variability of periphyton nutrient status and biomass on artificial and natural substrates in a tropical mesotrophic reservoir

Morphometric and biotic variables as potential predictors ofLudwigia sedoides(Humb. & Bonpl.) Hara in a large Amazonian reservoir

Effect of reservoir drawdown on biomass of three species of aquatic macrophytes in a large sub-tropical reservoir (Itaipu, Brazil)

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