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 7 publications

(3 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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.…”

supporting

confidence: 81%

Bacterial decomposition of allochthonous organic matter in shallow subtropical lakes

et al. 2021

View full text Add to dashboard Cite

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.

show abstract

supporting

confidence: 81%

Bacterial decomposition of allochthonous organic matter in shallow subtropical lakes

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Bacterial growth is dependent on nutrient availability. Increased bacterial abundance increases nutrient consumption, and the release of ions from decomposition increases EC in the soil [58]. Therefore, the highest SW, EC, AN, PHO, and INV contents in the G250 group instead reduced the community complexity.…”

Section: Effects Of Gap-related Microenvironments On Soil Bacterial C...mentioning

confidence: 97%

Forest Gaps Modulate the Composition and Co-Occurrence Network of Soil Bacterial Community in Larix principis-rupprechtii Mayr Plantation

et al. 2022

View full text Add to dashboard Cite

Forest gaps create a favorable microenvironment for the growth of the soil microbial community. This study aimed to explore the effects of gap-related microenvironmental heterogeneity on soil bacterial communities in Larix principis-rupprechtii Mayr forest gaps. Therefore, the redundancy analysis (RDA) and structure equations modeling (SEM) of affecting elements were further used to test the significance of forest gaps’ effect on soil bacterial community composition and co-occurrence structure complexity. The formation of forest gaps increased canopy opening (CO) and significantly increased soil moisture content (SW), soil temperature (ST) and the accumulation of acid phosphatase (PHO) and sucrase (INV) in the soil, and the G250 (forest gap size: >250 m2) was most conductive to the accumulation of light and soil total nutrient. G50, G70, and G100 (forest gap size: 50–70 m2, 70–100 m2, 100–125 m2) were most favorable for the natural regeneration of the L. principis-rupprechtii Mayr plantation. The light properties under the forest gaps were the most significant factor that influenced the soil bacterial community composition, followed by the size of the forest gap, with standard path coefficients (Std. PCs) of 0.45 and −0.37, respectively. The canopy opening (CO), relative light intensity (RLA) and leaf area index (LAI) were considered to be the most important environmental factors affecting bacterial community composition (Std. PCs: 0.97, 0.99, and −0.93, respectively). The natural regeneration density under the forest gap was the most significant factor influencing the complexity of the soil bacterial community co-occurrence network, followed by soil nutrients (Std. PCs: 0.87 and −0.76, respectively).

show abstract

“…(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).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

View full text Add to dashboard Cite

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.

show abstract

Eichhornia azurea decomposition and the bacterial dynamic: an experimental research

Cited by 7 publications

References 43 publications

Bacterial decomposition of allochthonous organic matter in shallow subtropical lakes

Bacterial decomposition of allochthonous organic matter in shallow subtropical lakes

Forest Gaps Modulate the Composition and Co-Occurrence Network of Soil Bacterial Community in Larix principis-rupprechtii Mayr Plantation

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

Contact Info

Product

Resources

About