scholarly journals CONTRIBUIÇÃO DA DECOMPOSIÇÃO DE MACRÓFITAS AQUÁTICAS (Eichhornia azurea) NA MATÉRIA ORGÂNICA DISSOLVIDA

2008 ◽  
Vol 12 (01) ◽  
pp. 42-56 ◽  
Author(s):  
Júlio César Rodrigues de Azevedo ◽  
Alinne Mizukawa ◽  
Mariana Carolina Teixeira ◽  
Thomaz Aurélio Pagioro
Keyword(s):  
Eichhornia Azurea

scholarly journals Ocorrência de plantas aquáticas nos reservatórios da Light-RJ

2003 ◽  
Vol 21 (spe) ◽  
pp. 105-108 ◽  
Author(s):  
D. Martins ◽  
E.D. Velini ◽  
R.A. Piteli ◽  
M, S. Tomazella ◽  
E. Negrisoli
Keyword(s):  
Eichhornia Crassipes ◽  
Egeria Densa ◽  
Eichhornia Azurea

O objetivo do presente trabalho foi caracterizar as comunidades infestantes de plantas aquáticas presentes nos reservatórios da Light-Sistema de Eletricidade S.A., localizada no município de Piraí-RJ. Os levantamentos foram realizados no período de julho a setembro de 1998. Os reservatórios analisados foram: Vigário, Pereira Passos e Lajes, sendo as quantidades de pontos amostrados de 19, 9 e 15, respectivamente. Em cada ponto amostrado fez-se a marcação das coordenadas geográficas e avaliou-se a porcentagem de ocupação do corpo d'água pelas espécies de plantas aquáticas presentes. Depois da identificação das plantas, pôde-se verificar quais eram as espécies mais freqüentes e a sua distribuição dentro do sistema de geração de energia. As espécies encontradas nos reservatórios foram: Brachiaria arrecta (Hack.) Stent.; Egeria densa Planch.; Eichhornia azurea (Sw.) Kunth.; Eichhornia crassipes (Mart.) Solms.; Hymenachne amplexicaulis (Rudge) Nees.; Panicum rivulare Trin.; Pistia stratiotis L.; Polygonum spp.; Sagitaria montevidensis Cham. & Schlecht; Salvinia auriculata (Micheli) Adans; e Thypha dominguensis L.

scholarly journals Oxygen demand during mineralization of aquatic macrophytes from an oxbow lake

2008 ◽  
Vol 68 (1) ◽  
pp. 61-67 ◽  
Author(s):  
I. Bianchini Jr. ◽  
MB. Cunha-Santino ◽  
AM. Peret
Keyword(s):  
Aquatic Macrophytes ◽  
Oxygen Demand ◽  
Oxbow Lake ◽  
Short Term ◽  
River Floodplain ◽  
Dissolved Carbon ◽  
Eichhornia Azurea ◽  
Aerobic Decomposition ◽  
Cyperus Giganteus ◽  
Egeria Najas

This study presents a kinetic model of oxygen consumption during aerobic decomposition of detritus from seven species of aquatic macrophytes: Cabomba furcata, Cyperus giganteus, Egeria najas, Eichhornia azurea, Salvinia auriculata, Oxycaryum cubense and Utricularia breviscapa. The aquatic macrophytes were collected from Óleo Lagoon situated in the Mogi-Guaçu river floodplain (SP, Brazil). Mineralization experiments were performed using the closed bottles method. Incubations made with lake water and macrophytes detritus (500 mL and 200 mg.L-1 (DM), respectively) were maintained during 45 to 80 days at 20 °C under aerobic conditions and darkness. Carbon content of leachates from aquatic macrophytes detritus and dissolved oxygen concentrations were analyzed. From the results we concluded that: i) the decomposition constants differ among macrophytes; these differences being dependent primarily on molecular and elemental composition of detritus and ii) in the short term, most of the oxygen demand seems to depend upon the demineralization of the dissolved carbon fraction.

scholarly journals Leaf decomposition of the macrophyte Eichhornia azurea and associated microorganisms and invertebrates

2018 ◽  
Vol 19 (1) ◽  
pp. 53-66
Author(s):  
C. Vieira da Silva ◽  
I. Bianchini ◽  
J. F. Gonçalves ◽  
R. A. Oliveira ◽  
R. Henry
Keyword(s):  
Leaf Decomposition ◽  
Eichhornia Azurea

scholarly journals Biología Floral de Eichhornia Azurea (Swartz) Kunth (Pontederiaceae)

2005 ◽  
Vol 1 (12) ◽  
pp. 128-135
Author(s):  
Víctor H. Lallana ◽  
María C. Marta
Keyword(s):  
Eichhornia Azurea

scholarly journals Patterns of the aquatic macrophyte cover in Cachoeira Dourada Reservoir (GO-MG)

2005 ◽  
Vol 65 (1) ◽  
pp. 19-24 ◽  
Author(s):  
L. M Bini ◽  
L. G Oliveira ◽  
D. C Souza ◽  
P. Carvalho ◽  
M. P. Pinto
Keyword(s):  
Aquatic Macrophytes ◽  
Positive Relationship ◽  
Aquatic Macrophyte ◽  
Main Body ◽  
Frequency Of Occurrence ◽  
Frequent Species ◽  
Eichhornia Azurea ◽  
The Relationship ◽  
Macrophyte Cover

The relationship between the aquatic macrophyte cover in upper segments of tributaries and this cover in these tributaries but near the reservoir's main body was tested. Sixteen taxa belonging to 12 families of aquatic macrophytes were recorded in Cachoeira Dourada Reservoir. The most frequent species were Eichhornia azurea (frequency of occurrence = 92%; n = 37 sites) and E. crassipes (44%). Upper segments of the tributaries were the main areas colonized by these aquatic macrophytes. The positive relationship between the aquatic macrophyte cover between the upper and lower segments of tributaries indicates the importance of dispersion in the colonization of the arms and the reservoir's main body.

scholarly journals Levantamento da infestação de plantas aquáticas em Porto Primavera antes do enchimento final do reservatório

2009 ◽  
Vol 27 (spe) ◽  
pp. 879-886 ◽  
Author(s):  
D Martins ◽  
R.A Pitelli ◽  
M.S Tomazella ◽  
R.H Tanaka ◽  
A.C.P Rodrigues
Keyword(s):  
Eichhornia Crassipes ◽  
Pistia Stratiotes ◽  
Alternanthera Philoxeroides ◽  
Typha Angustifolia ◽  
Pontederia Cordata ◽  
Eichhornia Azurea ◽  
Echinochloa Polystachya ◽  
Polygonum Lapathifolium ◽  
Paspalum Repens ◽  
Egeria Najas

O objetivo deste trabalho foi identificar as plantas aquáticas e os níveis de infestação de cada espécie em Porto Primavera antes do enchimento final do reservatório. Foram avaliados todos os focos de vegetação aquática no reservatório (72 pontos), sendo os pontos demarcados com um aparelho de GPS. As espécies foram identificadas e estimouse visualmente (tamanho da área) a distribuição proporcional das plantas no foco de infestação. Após a identificação, foram encontradas 18 espécies de plantas aquáticas vegetando no reservatório, das quais foram determinadas a frequência de espécie de planta aquática e a distribuição dentro do sistema de geração de energia. As espécies encontradas no reservatório foram: Eichhornia crassipes, Eichhornia azurea, Pistia stratiotes, Paspalum repens, Cyperus brevifolius, Paspalum conspersum, Echinochloa polystachya, Egeria densa, Egeria najas, Polygonum hidropiperoides, Polygonum lapathifolium, Alternanthera philoxeroides, Eleocharis sellowiana, Nymphaea ampla, Pontederia cordata, Salvinia auriculata, Salvinia rotundifolia e Typha angustifolia. As maiores frequências relativas foram observadas em: E. azurea (36,11%), E. crassipes (16,67%), P. stratiotes (13,89%), S. auriculata (13,89%), C. brevifolius (11,11%) e P. lapathifolium (6,94%).

Short term nitrogen dynamics in a small Brazilian wetland (Lago Infernão, São Paulo)

1989 ◽  
Vol 5 (3) ◽  
pp. 323-335 ◽  
Author(s):  
Clive Howard-Williams ◽  
F. de Esteves ◽  
J. E. Santos ◽  
M. T. Downes
Keyword(s):  
N Uptake ◽  
Algal Community ◽  
Nitrifying Bacteria ◽  
Temperature Changes ◽  
Time Period ◽  
Uptake Rates ◽  
Eichhornia Azurea ◽  
Short Time ◽  
Epiphyte Community

ABSTRACTWe have studied a number of related processes of the nitrogen cycle in a Brazilian floodplain lake to identify the major pools and pathways over a short time period. The study was centred on the littoral zone dominated by the floating plantEichhornia azurea, which has a large epiphyte algal community of which heterocystous cyanobacteria were the major components. The water column was continuously undersaturated with oxygen although some elevated values (to 60% saturation) were recorded in the macrophyte beds in the afternoon. Marked diel temperature changes were documented. NH4-N dominated the dissolved N component in the water with maximal values (60 mg m−3) at lowest O2, concentrations early in the morning. Nitrogen fixation (acetylene reduction) of the epiphyte community showed marked diel changes with daily values of 5 mg N fixed m−2day−1(based on 3:1 C2H4:N2ratio). Macrophyte NH4-N uptake rates (in situincubations) were 93 mg N m−2day−1. The activities of nitrifying bacteria could not be detected with the nitrapyrin block on dark CO2fixation but denitrification (acetylene block technique) was recorded in the sediments when enhanced with NO-3. The major pathways of aquatic nitrogen involved macrophyte uptake and sediment release of NH4-N.

scholarly journals Periphytic Cosmarium (Zygnematophyceae, Desmidiaceae) in lentic environments of the Upper Paraná River floodplain: Taxonomy and ecological aspects

2018 ◽  
Vol 30 (0) ◽  
Author(s):  
Nicolli Cristina Osório ◽  
Aparecida Miranda Polinario ◽  
Bárbara Dunck ◽  
Kisay Lorena Adame ◽  
Luciana Carapunarla ◽  
...  
Keyword(s):  
Paraná River ◽  
Taxonomic Study ◽  
Ecological Studies ◽  
River Floodplain ◽  
Parana River ◽  
Ecological Aspects ◽  
Eichhornia Azurea ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Paraná River Floodplain

Abstract Aim A taxonomic study of the species of the genus Cosmarium Corda ex Ralfs (Desmidiaceae) was conducted in two lentic environments of the Upper Paraná River Floodplain (Garças and Patos lakes). Methods The samples were collected in November 2016. Two petioles of Eichhornia azurea (Sw) Kunth were sampled and analyzed qualitatively. Results Six species, nine varieties, and three forms were identified, with five taxa being common to both lakes, nine in Garças Lake, and four in Patos Lake. Of this, thirteen species represent the first records for the floodplain environment. Conclusion This study contributes to the knowledge of the biodiversity of this region, providing support for future ecological studies and biomonitoring.

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