Aerobic and anaerobic decomposition of Pistia stratiotes leachates from a tropical eutrophic reservoir (Barra Bonita, SP, Brazil)

Bianchini, Irineu; Rh, Silva; Mb, Cunha-Santino; Rs, Panhota

doi:10.1590/s1519-69842010000300012

Cited by 6 publications

(1 citation statement)

References 25 publications

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“…Therefore, the increase in water temperature seems not to have influenced the result obtained greatly. Dissolved oxygen is another important controlling factor of macrophyte decomposition (Bianchini Jr. et al 2010 and. The oxidation and decomposition of labile fractions of Pistia stratiotes were greater with high availability of oxygen in the water (Bianchini Jr. et al 2010), such as happened with the refractory fractions of E. azurea (Cunha-Santino et al 2010, Bianchini Jr. et al 2014.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2018

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The knowledge of the decomposition of macrophytes and associated organisms is important to understand ecological processes that control aquatic ecosystem metabolism. The aims of the study were: 1) to investigate the structure and composition of the aquatic invertebrate community associated with the decomposition of leaves of the macrophyte Eichhornia azurea over time; 2) to determine the biomass of microorganisms (fungi and bacteria) and their relationship with the associated invertebrate communities; and 3) to assess the relationship between biotic and abiotic variables and invertebrate density. To analyze the decomposition process, leaves of E. azurea were put into litter bags and incubated in Barbosa Lake, São Paulo State, Brazil. Litter bags were retrieved at seven sampling occasions during a 2.5 month period. We measured decomposition rates of leaves, and the associated communities of invertebrates, the biomass of bacteria and fungi, and biotic and abiotic variables that might be associated with the decomposition process. Significant differences were found in the densities of invertebrates. The microorganism biomass also varied significantly throughout the experiment. Fungal biomass (ergosterol concentration) was positively associated with the density of most taxonomic groups of aquatic invertebrates, as well as the total density of invertebrates and their taxonomic richness. Total invertebrate density increased during the experiment, but the taxonomic richness of invertebrates did not follow this pattern. Insecta and Crustacea densities were the main contributors to similarity within the groups formed at each sampling time. The different ways that invertebrates use detritus, such as a food source or a feeding site, as well as their feeding plasticity, may have contributed to the increase in the total invertebrate density over time as decomposition progressed. After two months and a half of macrophyte incubation the loss of E. azurea leaf biomass was less than 4.4% of the initial value. Factors such as decreasing temperature throughout the experiment, possible inhibition of microorganism growth by leachates, the predominantly oligotrophic environment and low abrasion due to the environment lentic regime may have contributed to the low rate of decomposition of E. azurea. Our results suggest that decomposition process in the present study has not begun in fact and/or macrophyte decomposition in nature is much slower than previously thought.

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Section: Discussionmentioning

confidence: 99%

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

et al. 2018

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Effects of macrophyte leachate on Anabaena sp. and Chlamydomonas moewusii growth in freshwater tropical ecosystems

Bottino¹,

Vargas²,

Miwa³

et al. 2017

Limnology

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Effects of dissolved organic matter leaching from macrophyte litter on black water events in shallow lakes

Song

Jiang

2018

Environ Sci Pollut Res

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In recent years, the black water phenomenon has become an environmental event in eutrophic shallow lakes in China, leading to deterioration of lake ecosystems and potable water crises. Decomposition of macrophyte debris has been verified as a key inducement for black water events. In this study, the effects of the decomposition of dissolved organic matter (Kottelat et al., WASP 187:343-351, 2008) derived from macrophyte leachate on the occurrence of black water events are investigated to clarify the detailed mechanisms involved. Results show that dissolved organic matter (DOM) is composed of a trace of chromophoric DOM and mostly non-chromophoric dissolved organic matter (CDOM). DOM decomposition is accompanied by varied concentration of CDOM components, generation of organic particles, and increased microbial concentrations. These processes increase water chroma only during initial 48 h, so the intensified water color cannot be maintained by DOM decomposition alone. During DOM decomposition, microorganisms first consume non-CDOM, increasing the relative CDOM concentration and turning the water color to black (or brown). Simultaneously, tryptophan and aromatic proteins, which are major ingredients of CDOM, enhance UV light absorption, further aggravating the macroscopic phenomenon of black color. Our results show that DOM leached from decayed macrophytes promotes or even triggers the occurrence of black water events and should be taken more seriously in the future.

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Aerobic and anaerobic decomposition of Pistia stratiotes leachates from a tropical eutrophic reservoir (Barra Bonita, SP, Brazil)

Cited by 6 publications

References 25 publications

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

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

Effects of macrophyte leachate on Anabaena sp. and Chlamydomonas moewusii growth in freshwater tropical ecosystems

Effects of dissolved organic matter leaching from macrophyte litter on black water events in shallow lakes

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