Dry weight and chemical changes during decomposition of tropical macrophytes in lobo reservoir — São Paulo, Brazil

Esteves, Francisco A.; Barbieri, Ricardo

doi:10.1016/0304-3770(83)90038-4

Cited by 40 publications

(30 citation statements)

References 14 publications

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“…Despite being measured in static chambers in the laboratory, the results resembled those obtained in situ in other investigations. Initial leaching of soluble inorganic compounds observed in our experiment may be responsible for percentage decrease of ash-free organic matter (Rublee & Roman, 1982;Esteves & Barbieri, 1983;Ferreira & Esteves, 1992;Pagioro & Thomaz, 1999a). Subsequent increase in organic matter in the detritus may be the result of the microbial colonization that plays important roles in both the early and later decomposition stages.…”

Section: Discussionmentioning

confidence: 63%

“…They observed that a 10 o C increase could cause a two-to three-fold increase in bacterial activity, a finding corroborated by this study. Of all the potential factors, the high temperatures found in tropical and subtropical aquatic ecosystems are probably responsible for rapid detritus breakdown and macrophyte biomass turnover (Esteves & Barbieri, 1983). Carpenter & Adams (1979) also found an increase in the decay coefficient (k) of the submersed aquatic macrophyte Myriophyllum spicatum following an increase in temperature to 28 o C. This was succeeded by a decay coefficient decline, probably due to decreased heterotrophic activity at higher temperatures.…”

Section: Discussionmentioning

confidence: 96%

“…This model has two distinct phases: the initial, of marked leaching of soluble organic compounds (soluble carbohydrates, lipids, and polyphenols), followed by a second, with a slower decrease in mass, when colonization by microorganisms, degradation via invertebrate feeding, and physical abrasion of structural compounds such as cellulose and lignin become more important (Esteves & Barbieri, 1983;Boulton & Boon, 1991). However, the model that best described our data was the linear model (W t = W o -kt), which can therefore be regarded as a convenient way of describing the overall decay process in E. najas in the laboratory.…”

Section: Discussionmentioning

confidence: 99%

“…The importance of aquatic macrophytes in the structure and functioning of aquatic ecosystems is associated, among several other factors, with their capacity to incorporate nutrients from the sediment or water into their biomass and to release them by excretion or through decomposition (Esteves & Barbieri, 1983). Furthermore, the detrital food web probably represents the dominant energy-transfer pathway in most aquatic ecosystems, processing ca.…”

Section: Introductionmentioning

confidence: 99%

“…Most studies on decomposition of aquatic macrophytes, especially in the case of emergent and floating ones, have focused on weight loss and changes in the chemical composition of coarse particulate detritus over time (Esteves & Barbieri, 1983;Ayyappan et al, 1986;Bianchini Jr. et al, 1988;Findlay et al, 1990;Pagioro & Thomaz, 1999a). However, a few studies have examined the decay of submerged macrophytes (Carpenter & Adams, 1979;Rublee & Roman, 1982;Ferreira & Esteves, 1992;Gessner, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Effects of temperature on decomposition of a potential nuisance species: the submerged aquatic macrophyte Egeria najas planchom (Hydrocharitaceae)

2005

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Decomposition of aquatic plants is influenced by several biotic and abiotic factors. Among them, temperature plays an important role. Despite the increasing number of studies describing the effects of temperature on the decomposition of aquatic macrophytes, little attention has been given to the decay of submerged macrophytes. In this paper, we assessed the effect of temperature on weight loss and chemical composition of detritus of the submerged aquatic macrophyte Egeria najas Planchon (Hydrocharitaceae). Fresh plant material was maintained at 17 o C and 27 o C, in the dark, in incubation chambers. The overall decay process was best described by a linear model, with rates of 0.014 day -1 (R 2 = 94%) and 0.045 day -1 (R 2 = 96%) obtained at 17 o C and 27 o C, respectively. The analysis of covariance (ANCOVA) indicated a significant difference between the decomposition rates at the two temperatures. The rapid breakdown of E. najas detritus, indicated by the decay coefficient, may be explained by its low content of resistant compounds such as cellulose and lignin. The variables analyzed in this study (pH, electrical conductivity, dissolved oxygen in the water and organic matter, total nitrogen and total phosphorus concentration in detritus) showed accentuated responses at 27 o C. It is likely that the higher temperature increased microbial activity and, therefore, oxygen consumption in the water, consequently affecting the pH and the rate of ion and nutrient liberation into the aquatic ecosystem. Due to the rapid decomposition of E. najas at high temperatures, a small exportation is expected of this species from its stands to distant regions in tropical reservoirs, where it is considered a potential nuisance species.Key words: decomposition, temperature, Egeria najas. RESUMOEfeitos da temperatura sobre a decomposição de uma espécie potencialmente daninha: a macrófita aquática submersa Egeria najas Planchon (Hydrocharitaceae)Inúmeros fatores bióticos e abióticos influenciam a decomposição de plantas aquáticas, destacandose, entre eles, a temperatura. Apesar do grande número de estudos descrevendo os efeitos da temperatura sobre a decomposição de macrófitas aquáticas, pouca atenção tem sido dada à decomposição de espécies submersas. O objetivo do presente trabalho foi avaliar o efeito da temperatura sobre a perda de peso e composição química do detrito da macrófita aquática submersa Egeria najas Planchon (Hydrocharitaceae C. Provavelmente, as maiores temperaturas aumentam a atividade microbiana, aumentando, assim, o consumo de oxigênio na água e, conseqüentemente, afetando o pH e a taxa de liberação de íons e nutrientes para o ecossistema aquático. Em razão da rápida decomposição de E. najas em altas temperaturas, espera-se uma baixa taxa de exportação dessa espécie de seus estandes para regiões distantes em reservatórios tropicais, onde é considerada uma espécie potencialmente daninha.Palavras-chave: decomposição, temperatura, Egeria najas.

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Section: Discussionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of temperature on decomposition of a potential nuisance species: the submerged aquatic macrophyte Egeria najas planchom (Hydrocharitaceae)

2005

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Phosphorus Fractions and Fluxes in the Water Column and Sediments of a Tropical Reservoir (Lobo-Broa - SP)

Chalar

Tundisi²

2001

Internat. Rev. Hydrobiol.

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Sedimentation rates of organic and inorganic matter, chlorophyll a, P fractions, Ca, Mn, Fe and Al, were determined by sediment traps in a tropical oligo‐mesotrophic reservoir of São Paulo (Brazil). Vertical profiles of the sediments were analyzed for organic content, metals, P and surface P fraction composition. Estimated mean sedimentation rates, corrected for resuspension were: total solids, 1068 g m—2 y—1 (OM = 44.7%); chlorophyll a, 2.1 g m—2 y—1 and total phosphorus, 2.9 g m—2 y—1. The predominant P fraction in the settling flux was associated with aluminum minerals while surface sediments were dominated by organic P. The reservoir exhibited low sediment retention of P (13.0%), Al (9.9%), Fe (9.9%), Mn (1.4%) and Ca (traces), compared to trap sedimentation. This feature was related with a high vertical dynamics (resuspension and bottom release) and with the low retention time of the system.

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Study on the Decomposition of Pistia stratiotes L. (Araceae) in Cisne Reservoir, Uruguay

Sommaruga

Crosa

Mazzeo

1993

Intl Review of Hydrobiology

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Study on the Decomposition of Pistiu strutiotes L.(Araceae) in Cisne Reservoir, Uruguay key words: Pistia stratiotes, decomposition, phosphorus cycling, reservoir, Uruguay. AbstractA study on the decomposition process of Pisfia stratiotes L. was carried out in Cisne Reservoir, Uruguay. For this purpose, leaves and roots were considered separately, and the process was studied in the littoral and the pelagic zone. The litter bag technique was used to estimate dry weight losses at different times. Leaves decomposed faster than roots in both zones. Pistia decomposed faster in the pelagic zone due to better oxygen conditions and a more intensive water movement that removes material from within the bags. Phosphorus, potassium, sodium and magnesium were leached rapidly during the first week. Nitrogen content in the leaves initially increased, reaching its maximum in the littoral zone that coincided with that of bacterial numbers colonizing the litter. The number of macroinvertebrates, dominated by Chironomidae, was low. A rough estimation of the phosphorus impact on the littoral zone associated to the decomposition process shows that after 24 h between 13.9 and 16.8 pg-at.l-1 have been released to the water.

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Dry weight and chemical changes during decomposition of tropical macrophytes in lobo reservoir — São Paulo, Brazil

Cited by 40 publications

References 14 publications

Effects of temperature on decomposition of a potential nuisance species: the submerged aquatic macrophyte Egeria najas planchom (Hydrocharitaceae)

Effects of temperature on decomposition of a potential nuisance species: the submerged aquatic macrophyte Egeria najas planchom (Hydrocharitaceae)

Phosphorus Fractions and Fluxes in the Water Column and Sediments of a Tropical Reservoir (Lobo-Broa - SP)

Study on the Decomposition of Pistia stratiotes L. (Araceae) in Cisne Reservoir, Uruguay

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