2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2018 | 9:45 AM - 10:00 AM | PATCH DYNAMICS OF NITROGEN FIXATION AND DENITRIFICATION IN STREAMS | 330 B
PATCH DYNAMICS OF NITROGEN FIXATION AND DENITRIFICATION IN STREAMS
Streams are characterized by a high degree of spatial heterogeneity at multiple, nested scales that, in turn, influences rates and variability in ecosystem processes. Patches are a feature of this heterogeneity that may facilitate the co-occurrence of biogeochemical processes thought to be incompatible, like N2 fixation and denitrification. To test this hypothesis we measured rates of N2 fixation and denitrification in patches of six Idaho and Michigan streams. The coefficient of variation (CV) among all streams (CV = 5.9) for N2 fixation rates was greater than the CV in each individual stream. For denitrification rates, two streams displayed the highest variability in denitrification (CV = 3.4 and 3.7, respectively), because these streams had lower frequency of organic matter patches with high denitrification rates, relative to other substrate with low or zero rates. To further analyze the variation of instream processes and the mechanisms that create these patches, we are assessing microbial gene abundance and a suite of surface and hyporheic characteristics. Understanding the mechanisms behind patches in stream ecosystems will lead to a better understanding of how the spatial structure of stream ecosystems can affect complex biogeochemical cycling.
- Nitrogen
- Spatial
- Microbial
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Presenters/Authors
Erin Eberhard
(), Michigan Technological University , ekeberha@mtu.edu;
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Amy Marcarelli
(), Michigan Technological University, ammarcar@mtu.edu;
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Colden Baxter
(), Idaho State University, baxtcold@isu.edu;
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Stephen Techtmann
(), Michigan Technological University, smtechtm@mtu.edu;
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