Sulfur vs. silica retention in oligotrophic lake sediments: Test of a simple residence time model

1995 ◽  
Vol 81 (3-4) ◽  
pp. 373-383
Author(s):  
Robert E. Stauffer
Keyword(s):  
Lake Sediments ◽  
Residence Time ◽  
Oligotrophic Lake ◽  
Time Model ◽  
Silica Retention

scholarly journals Use of diffusion samplers in oligotrophic lake sediments: Effects of free oxygen in sampler material

1994 ◽  
Vol 39 (2) ◽  
pp. 468-474 ◽  
Author(s):  
Richard Carignan ◽  
Sylvie St-Pierre ◽  
Rene Gachter
Keyword(s):  
Lake Sediments ◽  
Oligotrophic Lake ◽  
Free Oxygen

Residence Time Model for Respirator Sorbent Beds

AIHAJ ◽  
1985 ◽  
Vol 46 (11) ◽  
pp. 679-689 ◽  
Author(s):  
MARK W. ACKLEY
Keyword(s):  
Residence Time ◽  
Time Model

Shape Optimization of a Polymer Distributor Using an Eulerian Residence Time Model

2019 ◽  
Vol 41 (4) ◽  
pp. B625-B648 ◽  
Author(s):  
Raphael Hohmann ◽  
Christian Leithäuser
Keyword(s):  
Shape Optimization ◽  
Residence Time ◽  
Time Model

Effects of macrophytes on potential nitrification and denitrification in oligotrophic lake sediments

2020 ◽  
Vol 167 ◽  
pp. 103287
Author(s):  
Sara Benelli ◽  
Cristina Ribaudo ◽  
Vincent Bertrin ◽  
Marco Bartoli ◽  
Elisa Anna Fano
Keyword(s):  
Lake Sediments ◽  
Oligotrophic Lake ◽  
Potential Nitrification ◽  
Nitrification And Denitrification

scholarly journals Trophic status and local conditions affect microbial potential for denitrification versus internal nitrogen cycling in lake sediments

2021 ◽  
Author(s):  
Kathrin B.L. Baumann ◽  
Raoul Thoma ◽  
Cameron M. Callbeck ◽  
Robert Niederdorfer ◽  
Carsten Schubert ◽  
...  
Keyword(s):  
Lake Sediments ◽  
Aquatic Ecosystems ◽  
Essential Element ◽  
Oligotrophic Lake ◽  
Environmental Drivers ◽  
Nutrient Concentrations ◽  
Local Conditions ◽  
N Cycle ◽  
N Transformation ◽  
N Removal

The nitrogen (N) cycle is of global importance as N is an essential element and a limiting nutrient in terrestrial and aquatic ecosystems. Excessive anthropogenic N fertilizer usage threatens sensitive downstream aquatic ecosystems. Although freshwater lake sediments remove N through various microbial transformation processes, few studies have investigated the microbial communities involved. In an integrated biogeochemical and microbiological study on a eutrophic and oligotrophic lake, we estimated N removal rates in the sediments from porewater concentration gradients. Simultaneously, the abundance of different microbial N transformation genes was investigated using metagenomics on a seasonal and spatial scale. We observed that contrasting nutrient concentrations in the sediments were reflected in distinct microbial community compositions and significant differences in the abundance of various N transformation genes. Within each lake, we observed a more pronounced spatial than seasonal variability. The eutrophic Lake Baldegg showed a higher denitrification potential with higher nosZ gene (N2O reductase) abundance and higher nirS:nirK (nitrite reductase) ratio, indicating a greater capacity for complete denitrification. Correspondingly, this lake had a higher N removal efficiency. The oligotrophic Lake Sarnen, in contrast, had a higher potential for DNRA and nitrification, and specifically a high abundance of Nitrospirae, including some capable of comammox. In general, the oligotrophic lake ecosystems had a higher microbial diversity, thus acting as an important habitat for oligotrophic microbes. Our results demonstrate that knowledge of the genomic N transformation potential is important for interpreting N process rates and understanding the limitations of the N cycle response to environmental drivers.

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