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

AIM: This study aimed at describing and discussing the leachates mineralization (aerobic and anaerobic) of two species of aquatic macrophytes (Salvinia molesta and Myriophyllum aquaticum) from a tropical reservoir (22° 00' S and 47° 54' W); METHODS: The incubations were prepared with plant leachates and reservoir water sample and were maintained during 45 days in the dark (at 20 °C). The organic carbon and the oxygen consumption kinetics were evaluated; RESULTS: Irrespective of to the experimental condition, the leachates were mainly utilized for catabolic processes (i.e., respiration), mineralization was slightly faster in an aerobic environment (1.22 fold) and in this condition, the yield of refractory products was smaller (2.3%); the O/C stoichiometric ratios values (oxygen consumed per atom of carbon) from mineralization of the 2 types of leachates were similar (ca. 1.12); CONCLUSIONS: According to these results we conclude that the leachate from selected macrophytes is rapidly decomposed and subsidize primariy the microbial catabolism (aerobic or anaerobic); in addition, we propose that S. molesta contributes more to the input of dissolved organic matter within the reservoir.

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Morphometry and retention time as forcing functions to establishment and maintenance of aquatic macrophytes in a tropical reservoir

Brazilian Journal of Biology ◽

10.1590/1519-6984.24214 ◽

2016 ◽

Vol 76 (3) ◽

pp. 673-685 ◽

Cited By ~ 2

Author(s):

M. B. Cunha-Santino ◽

A. T. Fushita ◽

A. C. Peret ◽

I. Bianchini-Junior

Keyword(s):

Retention Time ◽

Aquatic Macrophytes ◽

Driving Forces ◽

Plant Distribution ◽

Myriophyllum Aquaticum ◽

Shoreline Development ◽

Tropical Reservoir ◽

Local Conditions ◽

Eichhornia Azurea ◽

Wind Exposure

Abstract Macrophytes may constitute an important resource for several chemical, physical and biological processes within aquatic ecosystems. This study considers that in tropical reservoirs with low retention time and with low values of shoreline development (DL), the expansion and persistence of aquatic macrophytes are mainly reported to local conditions (e.g., hydrodynamic and wind exposure) rather than trophic status and depth of the euphotic zone. In this context, this study aimed at describing and comparing the incidence of aquatic macrophytes in a throughflowing, non-dendritic tropical reservoir. During February 2006 to November 2007, eight limnological surveys were performed quarterly within the Ourinhos Reservoir, and in the mouth areas of its tributaries. At the six sampling stations 30 variables were measured. The number of sites with plants varied between 21 and 38 and at the end of the 1st year the total richness was found. The sampling survey outcome the recognition of 18 species of aquatic macrophytes; Cyperaceae (2 genera and 1 species), Pontederiaceae (3 species) and Onarograceae (3 genera) were the families with higher diversity. Seven species (Typha domingensis Pers., Myriophyllum aquaticum (Vell.) Verdec, Salvinia auriculata Aubl., Eichhornia azurea (Sw.) Kunth, Eleocharis sp1, Eichhornia crassipes (Mart.) Solms, Oxycaryum cubense (Poepp. & Kunth) Lye) always were present and were more frequent in the sites. The occurrence of emergent species predominated (45.9%), followed by submersed rooted (24.5%), free floating (19.5%), floating rooted (9.7%) and free submersed (0.3%). Although limnological variables and the distribution of macrophytes have discriminated the same sampling points, the stepwise multiple linear regressions did not pointed out strong correspondences (or coherence) among the most constant and distributed macrophyte species and the selected limnological variables, as well the trophic statuses. Seeing the low relationship among limnological variables and macrophytes distribution, in the case of Ourinhos Reservoir, the results pointed out that the water turbulence, low DL and wind exposure are the main driving forces that determine its aquatic plant distribution, life forms and species composition.

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Colonization of leaf litter of two aquatic macrophytes, Mayaca fluviatilis Aublet and Salvinia auriculata Aublet by aquatic macroinvertebrates in a tropical reservoir

Ambiente e Agua - An Interdisciplinary Journal of Applied Science ◽

10.4136/ambi-agua.171 ◽

2011 ◽

Vol 6 (1) ◽

pp. 30-39 ◽

Cited By ~ 4

Author(s):

Fabio Laurindo da Silva ◽

Heliana Rosely Neves Oliveira ◽

Suzana Cunha Escarpinati ◽

Alaide Aparecida Fonseca-Gessner ◽

Marcia Cristina de Paula

Keyword(s):

Leaf Litter ◽

Aquatic Macrophytes ◽

Aquatic Macroinvertebrates ◽

Tropical Reservoir

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Methane diffusive fluxes from sediment exposed in a Brazilian tropical reservoir drawdown zone

Journal of South American Earth Sciences ◽

10.1016/j.jsames.2018.12.025 ◽

2019 ◽

Vol 90 ◽

pp. 463-470 ◽

Cited By ~ 1

Author(s):

Marcelo Amorim ◽

Marco Aurélio dos Santos ◽

João Marcello Ribeiro de Camargo

Keyword(s):

Tropical Reservoir ◽

Reservoir Drawdown ◽

Drawdown Zone ◽

Diffusive Fluxes

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Respiratory Metabolism of the Higher Aquatic Macrophytes under the Effect of Manganese Ions (II) of the Aquatic Environment

Hydrobiological Journal ◽

10.1615/hydrobj.v45.i6.80 ◽

2009 ◽

Vol 45 (6) ◽

pp. 97-109 ◽

Cited By ~ 1

Author(s):

Ye. A. Pasichnaya ◽

O. M. Arsan ◽

O. A. Godlevskaya

Keyword(s):

Aquatic Environment ◽

Aquatic Macrophytes ◽

Respiratory Metabolism ◽

Manganese Ions

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Water quality. Guidance standard for the surveying of aquatic macrophytes in running waters

10.3403/02895340u ◽

2015 ◽

Keyword(s):

Water Quality ◽

Aquatic Macrophytes ◽

Running Waters

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Establishment of Three Emergent Macrophytes Under Different Water Regimes

Water Science & Technology ◽

10.2166/wst.1999.0167 ◽

1999 ◽

Vol 40 (3) ◽

pp. 233-240 ◽

Cited By ~ 1

Author(s):

S. G. T. Giovannini ◽

D. M. L. da Motta Marques

Keyword(s):

Water Level ◽

Aquatic Macrophytes ◽

Water Regime ◽

Emergent Macrophytes ◽

Morphological Response ◽

Water Regimes ◽

Wetland Construction ◽

Scirpus Californicus ◽

Level 3 ◽

Plot Design

The behavior of three emergent aquatic macrophytes under different water regimes was studied with the aim of achieving reconvertion of degraded wetlands and wetland construction for water quality improvement. Scirpus californicus, Typha subulata and Zizaniopsis bonariensis establishment was evaluated under a split plot design, in a factorial experiment with three levels of a water regime factor over a subsoil substratum. The stagnant 10±2 cm water level was best suited to T. subulata and Z. bonariensis development and S. californicus developed better at oscillating water level (3±2 cm) with flooding at 48 hour intervals. The morphological response variables (thickness and width at half length of the tallest leaf or stem per plant, height of tallest leaf or stem per plant, number of green leaves or stems and number of shoots per plant, and survival of propagules' original leaves or stems) were satisfactory descriptors to differentiate (p<0.1%) growth of above ground parts as related to water regimes and species. The three species did survive satisfactory in subsoil-like substratum under the tested water regimes. Mortality was in the worse case, 17.2%, 36.7%, and 9.4% for S. californicus, T. subulata, and Z. bonariensis, respectively. Although Z. bonariensis growth was very poor, only S. californicus and T. subulata could be indicated for planting under similar limiting conditions.

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Potential Use of Aquatic Macrophytes to Enhance the Treatment of Septic Tank Liquids

Water Science & Technology ◽

10.2166/wst.1999.0166 ◽

1999 ◽

Vol 40 (3) ◽

pp. 225-232 ◽

Cited By ~ 2

Author(s):

S. Perdomo ◽

C. Bangueses ◽

J. Fuentes

Keyword(s):

Aquatic Macrophytes ◽

Typha Latifolia ◽

Correlation Coefficients ◽

Statistical Characteristics ◽

Septic Tank ◽

Conventional System ◽

Normal Probability ◽

Complete Treatment ◽

Floating Macrophyte ◽

Potential Use

In several urban and suburban areas, the problem of the disposal and treatment of septic tank liquids has not been solved yet. This paper deals with the primary operational evaluation of a conventional system of ponds used at Tarariras, in the Department of Colonia, Uruguay, as well as the potential use of aquatic macrophytes to enhance such treatment. The conventional system was sampled over a period of approximately one month at the end of the summer in order to determine the main parameters. Groups of up to 20 samples were studied to determine the normal distributions. Correlation coefficients were obtained for the normal probability plot between 0.84 and 0.99. The most relevant statistical characteristics were calculated for each parameter. The removal efficiency was 80.0% of BOD5, 58.5% of COD, 75.8% of NH4+-N, 9.5% of PO4−3-P and 38.5% of TSS. At the same time, batch and semi-continuous trials were carried out at bench scale with Eichhornia crassipes (floating macrophyte) and Typha latifolia (emergent macrophyte). The best efficiencies were obtained for the latter, with values of 96.6% of BOD5, 93.0% of COD, 99.6% of NH4+-N, 95.2% of PO4−3-P and 95.5% of TSS. It was concluded that constructed wetlands could be the answer to a more complete treatment process.

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