scholarly journals Do phages impact microbial dynamics, prokaryotic community structure and nutrient dynamics in Lake Bourget?

Biology Open ◽  
2015 ◽  
Vol 4 (11) ◽  
pp. 1528-1537 ◽  
Author(s):  
A. Meunier ◽  
S. Jacquet
Keyword(s):  
Community Structure ◽  
Nutrient Dynamics ◽  
Prokaryotic Community ◽  
Microbial Dynamics ◽  
Lake Bourget

scholarly journals Microbial and nutrient dynamics in mangrove, reef, and seagrass waters over tidal and diurnal time scales

2020 ◽  
Vol 85 ◽  
pp. 101-119
Author(s):  
CC Becker ◽  
L Weber ◽  
JJ Suca ◽  
JK Llopiz ◽  
TA Mooney ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Coral Reefs ◽  
Time Scales ◽  
Microbial Community Structure ◽  
Nutrient Dynamics ◽  
Environmental Parameters ◽  
Microbial Dynamics ◽  
Seagrass Meadows ◽  
Tidal Cycles

In coral reefs and adjacent seagrass meadow and mangrove environments, short temporal scales (i.e. tidal, diurnal) may have important influences on ecosystem processes and community structure, but these scales are rarely investigated. This study examines how tidal and diurnal forcings influence pelagic microorganisms and nutrient dynamics in 3 important and adjacent coastal biomes: mangroves, coral reefs, and seagrass meadows. We sampled for microbial (Bacteria and Archaea) community composition, cell abundances and environmental parameters at 9 coastal sites on St. John, US Virgin Islands that spanned 4 km in distance (4 coral reefs, 2 seagrass meadows and 3 mangrove locations within 2 larger bays). Eight samplings occurred over a 48 h period, capturing day and night microbial dynamics over 2 tidal cycles. The seagrass and reef biomes exhibited relatively consistent environmental conditions and microbial community structure but were dominated by shifts in picocyanobacterial abundances that were most likely attributed to diel dynamics. In contrast, mangrove ecosystems exhibited substantial daily shifts in environmental parameters, heterotrophic cell abundances and microbial community structure that were consistent with the tidal cycle. Differential abundance analysis of mangrove-associated microorganisms revealed enrichment of pelagic oligotrophic taxa during high tide and enrichment of putative sediment-associated microbes during low tide. Our study underpins the importance of tidal and diurnal time scales in structuring coastal microbial and nutrient dynamics, with diel and tidal cycles contributing to a highly dynamic microbial environment in mangroves, and time of day likely contributing to microbial dynamics in seagrass and reef biomes.

Impacts of switching tillage to no-tillage and vice versa on soil structure, enzyme activities, and prokaryotic community profiles in Argentinean semi-arid soils

2021 ◽  
Author(s):  
L A Gabbarini ◽  
E Figuerola ◽  
J P Frene ◽  
N B Robledo ◽  
F M Ibarbalz ◽  
...  
Keyword(s):  
Community Structure ◽  
Soil Structure ◽  
Management Practices ◽  
Soil Health ◽  
Amplicon Sequencing ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Prokaryotic Community ◽  
C Cycle

Abstract The effects of tillage on soil structure, physiology, and microbiota structure were studied in a long-term field experiment, with side-to-side plots, established to compare effects of conventional tillage (CT) vs. no-till (NT) agriculture. After 27 years, part of the field under CT was switched to NT and vice versa. Soil texture, soil enzymatic profiles, and the prokaryotic community structure (16S rRNA genes amplicon sequencing) were analysed at two soil depths (0–5, 5–10 cm) in samples taken 6, 18, and 30 months after switching tillage practices. Soil enzymatic activities were higher in NT than CT, and enzymatic profiles responded to the changes much earlier than the overall prokaryotic community structure. Beta diversity measurements of the prokaryotic community indicated that the levels of stratification observed in long-term NT soils were already recovered in the new NT soils thirty months after switching from CT to NT. Bacteria and Archaea OTUs, which responded to NT were associated with coarse soil fraction, SOC and C cycle enzymes while CT responders were related to fine soil fractions and S cycle enzymes. This study showed the potential of managing the soil prokaryotic community and soil health through changes in agricultural management practices.

Topographic Attributes Override Impacts of Agronomic Practices on Prokaryotic Community Structure

2021 ◽  
Author(s):  
Mitra Ghotbi ◽  
Ademir Durrer ◽  
Katharina Frindte ◽  
William R. Horwath ◽  
Jorge L. M. Rodrigues ◽  
...  
Keyword(s):  
Community Structure ◽  
Prokaryotic Community ◽  
Agronomic Practices ◽  
Topographic Attributes

Dietary condensed tannins in bovine faeces and effects on soil microbial dynamics: are there environmental benefits for cattle production systems?

2021 ◽  
Vol 61 (7) ◽  
pp. 690
Author(s):  
Gisele M. Fagundes ◽  
Gabriela Benetel ◽  
Mateus M. Carriero ◽  
Ricardo L. M. Sousa ◽  
Kelly C. Santos ◽  
...  
Keyword(s):  
Organic Matter ◽  
Condensed Tannins ◽  
Nutrient Dynamics ◽  
Management Practices ◽  
Production Systems ◽  
Environmental Benefits ◽  
Nutrient Inputs ◽  
Microbial Dynamics ◽  
Soil Microbial ◽  
Soil Microbial Population

Context Plant bioactive compounds such as condensed tannins (CT) are seen as an alternative to rumen chemical modulators to mitigate rumen methanogenesis in livestock; however, the presence of CT in ruminant faeces also produces a series of changes in soil microbiomes. Little is known about these effects on soil nutrient dynamics. Therefore, whether CT affect the decomposition process of faecal organic matter, delaying it and consequently increasing soil carbon and nitrogen (N) sequestration, merits study. Aims Our study investigated the effects of a diet rich in CT on bovine faecal composition and on subsequent dynamics of a soil microbial population. Methods Faeces were analysed from cattle fed the following diets: control (no CT), 1.25% CT, 2.5% CT. In a greenhouse pot experiment over a period of 60 days, faeces from the three dietary treatments were applied to soil and the soil microbial populations were measured against a control with no faeces applied. Key results The presence of CT increased the excretion of faecal N and of neutral and acid detergent fibres and lignin, and the higher rate of CT reduced the rate of soil organic matter decomposition. Treatments with dietary CT resulted in greater total numbers of bacteria in the soil than in the no-faeces control and stimulated numbers of Actinobacteria, Proteobacteria (α-Proteobacteria) and Firmicutes. Conclusions The study showed that CT alter N recycling and other nutrient inputs in a soil–animal ecosystem by increasing faecal N inputs, delaying organic matter breakdown, and changing soil microbial dynamics. Implications The presence of CT in ruminant diets can be beneficial to the soil environment. Sustainable management practices should be encouraged by providing ruminants with feed including high-CT legumes in silvopastoral systems.

scholarly journals Prokaryotic Community Structure and Metabolisms in Shallow Subsurface of Atacama Desert Playas and Alluvial Fans After Heavy Rains: Repairing and Preparing for Next Dry Period

2019 ◽  
Vol 10 ◽  
Author(s):  
Miguel Ángel Fernández-Martínez ◽  
Rita dos Santos Severino ◽  
Mercedes Moreno-Paz ◽  
Ignacio Gallardo-Carreño ◽  
Yolanda Blanco ◽  
...  
Keyword(s):  
Community Structure ◽  
Atacama Desert ◽  
Alluvial Fans ◽  
Prokaryotic Community ◽  
Dry Period ◽  
Shallow Subsurface ◽  
Heavy Rains

Contrasted ecological niches shape fungal and prokaryotic community structure in mangroves sediments

2019 ◽  
Vol 21 (4) ◽  
pp. 1407-1424 ◽  
Author(s):  
Patricia Luis ◽  
Geoffroy Saint‐Genis ◽  
Laurent Vallon ◽  
Carine Bourgeois ◽  
Maxime Bruto ◽  
...  
Keyword(s):  
Community Structure ◽  
Ecological Niches ◽  
Prokaryotic Community

Factors influencing prokaryotic community structure composition in sub-surface coastal sediments

2012 ◽  
Vol 97 ◽  
pp. 141-148 ◽  
Author(s):  
Massimiliano Molari ◽  
Donato Giovannelli ◽  
Giuseppe d’Errico ◽  
Elena Manini
Keyword(s):  
Community Structure ◽  
Coastal Sediments ◽  
Prokaryotic Community ◽  
Factors Influencing
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