Decomposition of young water hyacinth leaves in lake water

Gupta, Mahendra Kumar; Shrivastava, Pankaj; Singhal, Pradeep K.

doi:10.1007/bf00013680

Cited by 22 publications

(20 citation statements)

References 13 publications

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“…The result showed in the present study corroborated with the fact that major fractions of DOM were in inorganic form; in this way, the leachate is mainly constituted by nutrients such as dissolved nitrogen (e.g. ammonia), orthophosphate and total phosphorous (Gupta et al, 1996). In this context, it is supposed that, when detritus cycling is carried out on Óleo Lagoon hypolimniom, the major source of nutrients came from sediment; this process can compensate for the lack of nutrient related with lignocellulosic detritus, increasing consequently, the benthonic oxygen demand.…”

supporting

confidence: 89%

Oxygen demand during mineralization of aquatic macrophytes from an oxbow lake

Bianchini

2008

Braz. J. Biol.

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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.Keywords: aquatic macrophytes, oxygen uptake, oxbow lake and kinetic. Demanda de oxigênio durante a mineralização de macrófitas aquáticas de uma lagoa marginal ResumoNesse estudo foi utilizado um modelo cinético para a descrição dos consumos de oxigênio durante a mineralização aeróbia de detritos de sete espécies de macrófitas aquáticas: Cabomba furcata, Cyperus giganteus, Egeria najas, Eichhornia azurea, Salvinia auriculata, Oxycaryum cubense e Utricularia breviscapa. As macrófitas aquáticas foram coletadas na Lagoa do Óleo, situada na planície de inundação do rio Mogi-Guaçu (SP, Brasil). Os experimentos foram realizados empregando-se incubações similares as de DBO. As incubações foram preparadas com água da lagoa e detritos das macrófitas aquáticas (500 mL e 200 mg.L -1 (PS), respectivamente) e foram mantidas durante 45 a 80 dias a 20 °C, sob condições aeróbias e no escuro. Foram determinados os conteúdos de carbono dos lixiviados dos detritos e os consumos de oxigênio dissolvido durante a mineralização. A partir dos resultados obtidos pôde-se concluir que: i) os coeficientes de mineralização das macrófitas aquáticas diferiram entre si, essas diferenças dependeram principalmente das composições moleculares e elementares dos detritos; e ii) a curto prazo, grande parte da demanda de oxigênio parece depender da mineralização das de carbono dissolvido provenientes da lixiviação.Palavras-chave: macrófitas aquáticas, consumo de oxigênio, lagoa marginal e cinética.

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supporting

confidence: 89%

Oxygen demand during mineralization of aquatic macrophytes from an oxbow lake

Bianchini

2008

Braz. J. Biol.

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“…The decomposition of plant materials are known to occur through several stages. It begins with leaching of water and releasing of most water-soluble compounds (39). The trimming of hedyotide B2 is probably facilitated by aminopeptidase liberated during this leaching process.…”

Section: Discussionmentioning

confidence: 99%

“…The trimming of hedyotide B2 is probably facilitated by aminopeptidase liberated during this leaching process. Another early event is the breakdown of the plant materials that provide nutrients and surface area for bacteria and fungi colonization (39). These microorganisms produce a great diversity of enzymes that possibly contribute to the degradation of hedyotide B2.…”

Section: Discussionmentioning

confidence: 99%

Discovery of a Linear Cyclotide from the Bracelet Subfamily and Its Disulfide Mapping by Top-down Mass Spectrometry

Nguyen

Zhang

Wang

et al. 2011

Journal of Biological Chemistry

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Background: Cyclotides are plant-derived cyclic peptides that are divided into Möbius and bracelet subfamilies. Currently, only four linear variants of the Möbius subfamily have been isolated. Results: We discovered hedyotide B2 as the first linear representative of the bracelet subfamily. Conclusion: Hedyotide B2 shares the same connectivity as conventional cyclotides. Its linear structure is genetically predetermined. Significance: Our study broadens our knowledge of linear cyclotides.

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“…Litter breakdown has been widely studied in streams and rivers (Graça and Pereira, 1995;Diez et al, 2002;Menéndez et al, 2003;Pinna et al, 2003;Pinna et al, 2004;Sangiorgio et al, 2006), lakes (Gupta et al, 1996;van Dokkum et al, 2002) and transitional aquatic ecosystems, such as coastal lagoons or river mouths (Rossi and Costantini, 2000;Menéndez et al, 2004;Sangiorgio et al, 2004;Bayo et al, 2005;Sangiorgio et al, 2008aSangiorgio et al, , 2008b. Otherwise, the decomposition of biomass on temporary freshwater wet sites with seasonally fluctuating water levels has received relatively little attention (Bedford, 2005;Völlm and Tannenberger, 2014).…”

Section: Introductionmentioning

confidence: 99%

Seasonal and multi-annual patterns ofPhragmites australisdecomposition in a wetland of the Adriatic area (Northeast Italy): a three-years analysis

Bertoli

Brichese

Michielin

et al. 2016

Knowl. Manag. Aquat. Ecosyst.

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-Wetlands are one of the most biologically productive ecosystems, in which reedbeds of Phragmites australis are an essentially detritus-based system where litter decomposition is a fundamental process. This study represents a three year dataset describing cyclic trends of Phragmites australis leaf litter breakdown in a temporary and managed environment. For three years, 45 days field experiments were seasonally performed, using leaf bag technique within a large managed temporary pond (Natural Reserve of the Isonzo River Mouth, Northeast Italy), in order to analyze spatial and temporal variation in decomposition processes, to search for patterns on seasonal and inter-annual time scale and to infer the relevance of the main environmental features (physical and chemical) on decomposition dynamic. During the three years of analysis, decay rates (k) ranges were 0.0066-0.0075 days −1 in autumn, 0.0108-0.0158 days −1 in spring and k = 0.0168 days −1 in summer. Average mass loss per day % range was 0.97-1.31% in autumn, 1.12-2.04% in spring and 1.79-2.06% in summer. A well-defined seasonal cycle was observed through the study years as result of the drought-reflooding dynamic and the highest percentage (91.1%) of the average mass loss per day % variability was explained above all by rainfall, temperature and conductivity. Key-words:Leaf bag / wetland / seasonal dynamic / temporary pond / decomposition rate Résumé -Schémas saisonnier et pluriannuel de décomposition de Phragmites australis dans une zone humide de la région adriatique (Italie du Nord) : une étude de trois ans. Les zones humides sont parmi les écosystèmes les plus productifs, dont les roselières à Phragmites australis constituent un système basé essentiellement sur les détritus, où la décomposition de la litière représente un processus fondamental. Cette étude analyse un ensemble pluriannuel de données qui décrit les tendances cycliques relatives à la décomposition de Phragmites australis dans un milieu temporaire d'eau douce sujet à la gestion. Pendant trois ans, 45 jours d'expériences sur le terrain ont été effectués de façon saisonnière, en utilisant la technique du sac de feuilles dans un grand étang temporaire géré (Réserve Naturelle de l'embouchure de la rivière Isonzo, Italie du Nord), afin d'analyser les variations spatiales et temporelles dans les processus de décomposition, à la recherche de modèles à l'échelle temporelle saisonnière et inter-annuelle et d'en déduire la pertinence des principales caractéristiques environnementales (physiques et chimiques) sur la dynamique de la décomposition. Au cours des trois années d'analyse, les taux de décomposition (k) étaient 0,0066-0,0075 jours −1 à l'automne, 0,0108-0,0158 jours −1 au printemps et k = 0,0168 jours −1 en été. La perte moyenne de masse par jour était de 0,97 à 1,31 % en automne, 01,12 à 02,04 % au printemps et de 1,79 à 2,06 % en été. Un cycle saisonnier bien défini a été observé au cours des années d'études résultant de l'alternance assec-mise en eau. Le pourcentage le plus élevé (...

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Decomposition of young water hyacinth leaves in lake water

Cited by 22 publications

References 13 publications

Oxygen demand during mineralization of aquatic macrophytes from an oxbow lake

Oxygen demand during mineralization of aquatic macrophytes from an oxbow lake

Discovery of a Linear Cyclotide from the Bracelet Subfamily and Its Disulfide Mapping by Top-down Mass Spectrometry

Seasonal and multi-annual patterns ofPhragmites australisdecomposition in a wetland of the Adriatic area (Northeast Italy): a three-years analysis

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