Eichhornia azurea decomposition and the bacterial dynamic: an experimental research

Dahroug, Zaryf; Santana, Natália Fernanda; Pagioro, Thomaz Aurélio

doi:10.1016/j.bjm.2015.08.001

Cited by 6 publications

(2 citation statements)

References 43 publications

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“…The dominant bacterial morphotype in all lakes was coccus, similar to that observed byDahroug et al (2016) in a microcosm decomposition study of Eichhornia azurea. Environments with a higher availability of resources and nutrients, as well as the ecosystems in the present study, facilitate the metabolic activity of spherical (e.g.…”

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confidence: 81%

Bacterial decomposition of allochthonous organic matter in shallow subtropical lakes

et al. 2021

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Shallow lakes favour the development of aquatic macrophytes that can influence the limnological characteristics of these environments. In addition to macrophytes, allochthonous organic matter contributes to the metabolism of lakes through the bed of decomposing detritus. Among the decomposing microorganisms, bacteria can be important in the processing of organic matter when the abundance of fungi and invertebrates is low. The present study evaluated the effects of macrophyte coverage on bacterial-mediated leaf decomposition of allochthonous debris in shallow subtropical lakes. Litter bags were incubated with senescent leaves of Erythrina crista-galli in six shallow lakes, three with high (HML) and three with low (LML) macrophyte coverage.After 2, 7, 15 and 35 days of incubation, a set of litter bags was removed from each lake for bacterial, environmental and mass-loss analyses. Decomposition rates were higher in the LML (49% of remaining mass), compared to the HML (63% of remaining mass). The bacterial density and biomass were higher in the LML. Limnological variables influenced bacterial morphotypes, especially branched filament. Thus, the high coverage of aquatic macrophytes can be a main factor influencing the bacterial colonization in the debris, delaying the decomposition process in these ecosystems.

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confidence: 81%

Bacterial decomposition of allochthonous organic matter in shallow subtropical lakes

et al. 2021

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“…(Wong et al 1998). Regarding aquatic bacteria, a laboratory experiment on bacterioplankton dynamics during the decomposition of E. azurea identified morphotypes Spirillum, Vibrio, Coccus and Bacillus in increasing density (cells.ml -1 ) at most of the sampling times (Dahroug et al 2016). However, factors such as competition may limit resources and thus control the density/biomass of these organisms, as a consequence to decay rates Suberkropp 2003, Dahroug et al 2016).…”

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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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Phosphorus release during decomposition of the submerged macrophyte Potamogeton crispus

Wang

Liu

et al. 2018

Limnology

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The decomposition rate of Potamogeton crispus and its rates of phosphorus (P) release and sedimentation were quantified during natural senescence in a microcosm experiment. The decay of P. crispus was characterized by an exponential model with a mean mass loss coefficient (k) of 0.05 day −1 . During the first 10 days, the rapid decomposition phase, k was 0.068 day −1 . The rates of P release and total P sedimentation, as well as the dissolved total P, soluble reactive phosphorus, dissolved organic phosphorus, and particulate phosphorus, were quantified throughout the 30-day study period. The nitrogen (N) and P contents of P. crispus increased whereas the carbon (C) content and the C:N, C:P, and N:P ratios decreased near the end of the decomposition phase. In addition, the pH, dissolved oxygen, and redox potential decreased during the rapid release of P. The results indicated that the rate of mass loss was slower from dried plants than from senescent plants. The rapid decomposition rate, which was associated with a high rate of P release, suggests that much of the accumulated P will eventually be returned to the aquatic ecosystem. These data illuminate the mechanisms of decomposition and suggest a strategy of reducing eutrophication by harvesting P. crispus prior to its senescence.

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Eichhornia azurea decomposition and the bacterial dynamic: an experimental research

Cited by 6 publications

References 43 publications

Bacterial decomposition of allochthonous organic matter in shallow subtropical lakes

Bacterial decomposition of allochthonous organic matter in shallow subtropical lakes

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

Phosphorus release during decomposition of the submerged macrophyte Potamogeton crispus

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