Seasonal and Storm Dynamics of the Hyporheic Zone of a 4th-Order Mountain Stream. II: Nitrogen Cycling

1996 ◽  
Vol 15 (1) ◽  
pp. 20-34 ◽  
Author(s):  
Steven M. Wondzell ◽  
Frederick J. Swanson
Keyword(s):  
Nitrogen Cycling ◽  
Hyporheic Zone ◽  
Mountain Stream ◽  
Storm Dynamics

scholarly journals Temporal dynamics of nitrogen cycle gene diversity in a hyporheic microbiome

2019 ◽  
Author(s):  
William C. Nelson ◽  
Emily B. Graham ◽  
Alex R. Crump ◽  
Sarah J. Fansler ◽  
Evan V. Arntzen ◽  
...  
Keyword(s):  
Nitrogen Cycling ◽  
Nitrogen Cycle ◽  
Hyporheic Zone ◽  
Environmental Changes ◽  
Temporal Dynamics ◽  
Gene Diversity ◽  
Optimal Growth ◽  
Community Function ◽  
Level Function ◽  
Denitrification Genes

ABSTRACTBiodiversity is thought to prevent decline in community function in response to changing environmental conditions through replacement of organisms with similar functional capacity but different optimal growth characteristics. We examined how this concept translates to the within-gene level by exploring seasonal dynamics of within-gene diversity for genes involved in nitrogen cycling in hyporheic zone communities. Nitrification genes displayed low richness— defined as the number of unique within-gene phylotypes—across seasons. Conversely, denitrification genes varied in both richness and the degree to which phylotypes were recruited or lost. These results demonstrate that there is not a universal mechanism for maintaining community functional potential for nitrogen cycling activities, even across seasonal environmental shifts to which communities would be expected to be well adapted. As such, extreme environmental changes could have very different effects on the stability of the different nitrogen cycle activities. These outcomes suggest a need to modify existing conceptual models that link biodiversity to microbiome function to incorporate within-gene diversity. Specifically, we suggest an expanded conceptualization that (1) recognizes component steps (genes) with low diversity as potential bottlenecks influencing pathway-level function, and (2) includes variation in both the number of entities (e.g. species, phylotypes) that can contribute to a given process and the turnover of those entities in response to shifting conditions. Building these concepts into process-based ecosystem models represents an exciting opportunity to connect within-gene-scale ecological dynamics to ecosystem-scale services.

scholarly journals Organic matter storage and decomposition in the hyporheic zone of a mountain stream

2018 ◽  
Vol 60 (2) ◽  
pp. 193-203
Author(s):  
Tomoya KUBO ◽  
Tamao KASAHARA ◽  
Masaaki CHIWA ◽  
Kyouichi OTSUKI
Keyword(s):  
Organic Matter ◽  
Hyporheic Zone ◽  
Mountain Stream

scholarly journals Carbon dynamics in the hyporheic zone of a headwater mountain stream in the Cascade Mountains, Oregon

2016 ◽  
Vol 52 (10) ◽  
pp. 7556-7576 ◽  
Author(s):  
Hayley A. Corson-Rikert ◽  
Steven M. Wondzell ◽  
Roy Haggerty ◽  
Mary V. Santelmann
Keyword(s):  
Hyporheic Zone ◽  
Carbon Dynamics ◽  
Mountain Stream ◽  
Cascade Mountains

Influence of Exchange Flow Between the Channel and Hyporheic Zone on Nitrate Production in a Small Mountain Stream

1990 ◽  
Vol 47 (11) ◽  
pp. 2099-2111 ◽  
Author(s):  
Frank J. Triska ◽  
John H. Duff ◽  
Ronald J. Avanzino
Keyword(s):  
Dissolved Oxygen ◽  
Hyporheic Zone ◽  
Mountain Stream ◽  
Ammonium Concentration ◽  
Nitrification Inhibitors ◽  
Exchange Flow ◽  
Concentration Gradients ◽  
Local Exchange ◽  
Nitrate Production ◽  
Subsurface Waters

Variation in local exchange of flows between the channel and hyporheic zone produced temporally shifting concentration gradients of dissolved oxygen, nitrate, and ammonium in subsurface waters of a small, gravel-cobble bed stream. Channel water advected laterally supplied dissolved oxygen, and groundwater supplied ammonium to support hyporheic nitrification. Nitrate production was highest in sediment slurries from aerobic hyporheic sites, was absent at nearly anoxic sites, and was stopped by nitrification inhibitors (chlorate and nitrapyrin). Ammonium amendment to sediment slurries only slightly enhanced nitrate production indicating that sorption competed with biota for available substrate. Nitrate concentration increased from 75–130 μg N/L during 9 d of ammonium amendment to a hyporheic subsurface flow. Ammonium concentration rose slowly relative to a sulfate tracer initially, and declined slowly after cutoff as ammonium desorbed. Nitrate levels remained elevated for 6 d after cutoff as desorbed ammonium became biotically available. Interactions between the channel's hydrology, lithology, and biology such as we observed in nitrate production are probably more common than reported. However, the magnitude of the resulting nutrient flux will depend on factors which determine the depth and lateral extension of suitable hyporheic habitat.

scholarly journals Acetate retention and metabolism in the hyporheic zone of a mountain stream

1999 ◽  
Vol 44 (6) ◽  
pp. 1530-1539 ◽  
Author(s):  
Michelle A. Baker ◽  
Clifford N. Dahm ◽  
H. Maurice Valett
Keyword(s):  
Hyporheic Zone ◽  
Mountain Stream

scholarly journals Time‐Variable Transit Time Distributions in the Hyporheic Zone of a Headwater Mountain Stream

2018 ◽  
Vol 54 (3) ◽  
pp. 2017-2036 ◽  
Author(s):  
Adam S. Ward ◽  
Noah M. Schmadel ◽  
Steven M. Wondzell
Keyword(s):  
Transit Time ◽  
Hyporheic Zone ◽  
Time Variable ◽  
Mountain Stream
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