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Full-Text Articles in Life Sciences
Stream Dissolved Organic Matter In Permafrost Regions Shows Surprising Compositional Similarities But Negative Priming And Nutrient Effects, Ethan Wologo, Sarah Shakil, Scott Zolkos, Sadie Textor, Stephanie Ewing, Jane Klassen, Robert G. M. Spencer, David C. Podgorski, Suzanne E. Tank, Michelle A. Baker, Jonathan A. O'Donnell, Kimberly P. Wickland, Sydney S. W. Foks, Jay P. Zarnetske, Joseph Lee-Cullin, Futing Liu, Yuanhe Yang, Pirkko Kortelainen, Jaana Kolehmainen, Joshua F. Dean, Jorien E. Vonk, Robert M. Holmes, Gilles Pinay, Michaela M. Powell, Jansen Howe, Rebecca J. Frei, Samuel P. Bratsman, Benjamin W. Abbott
Stream Dissolved Organic Matter In Permafrost Regions Shows Surprising Compositional Similarities But Negative Priming And Nutrient Effects, Ethan Wologo, Sarah Shakil, Scott Zolkos, Sadie Textor, Stephanie Ewing, Jane Klassen, Robert G. M. Spencer, David C. Podgorski, Suzanne E. Tank, Michelle A. Baker, Jonathan A. O'Donnell, Kimberly P. Wickland, Sydney S. W. Foks, Jay P. Zarnetske, Joseph Lee-Cullin, Futing Liu, Yuanhe Yang, Pirkko Kortelainen, Jaana Kolehmainen, Joshua F. Dean, Jorien E. Vonk, Robert M. Holmes, Gilles Pinay, Michaela M. Powell, Jansen Howe, Rebecca J. Frei, Samuel P. Bratsman, Benjamin W. Abbott
Biology Faculty Publications
Permafrost degradation is delivering bioavailable dissolved organic matter (DOM) and inorganic nutrients to surface water networks. While these permafrost subsidies represent a small portion of total fluvial DOM and nutrient fluxes, they could influence food webs and net ecosystem carbon balance via priming or nutrient effects that destabilize background DOM. We investigated how addition of biolabile carbon (acetate) and inorganic nutrients (nitrogen and phosphorus) affected DOM decomposition with 28-day incubations. We incubated late-summer stream water from 23 locations nested in seven northern or high-altitude regions in Asia, Europe, and North America. DOM loss ranged from 3% to 52%, showing a …
Metabolism, Gas Exchange, And Carbon Spiraling In Rivers, Robert Ogden Hall, Jennifer L. Tank, Michelle A. Baker, Erin R. Hotchkiss, Emma J. Rosi-Marshall
Metabolism, Gas Exchange, And Carbon Spiraling In Rivers, Robert Ogden Hall, Jennifer L. Tank, Michelle A. Baker, Erin R. Hotchkiss, Emma J. Rosi-Marshall
Biology Faculty Publications
Ecosystem metabolism, that is, gross primary productivity (GPP) and ecosystem respiration (ER), controls organic carbon (OC) cycling in stream and river networks and is expected to vary predictably with network position. However, estimates of metabolism in small streams outnumber those from rivers such that there are limited empirical data comparing metabolism across a range of stream and river sizes. We measured metabolism in 14 rivers (discharge range 14–84 m3 s−1) in the Western and Midwestern United States (US). We estimated GPP, ER, and gas exchange rates using a Lagrangian, 2-station oxygen model solved in a Bayesian framework. …
Are Rivers Just Bigstreams? Using A Pulse Method To Measure Nitrogen Demand In A Large River, J. L. Tank, E. J. Rosi-Marshall, Michelle A. Baker, R. O. Hall Jr.
Are Rivers Just Bigstreams? Using A Pulse Method To Measure Nitrogen Demand In A Large River, J. L. Tank, E. J. Rosi-Marshall, Michelle A. Baker, R. O. Hall Jr.
Biology Faculty Publications
Given recent focus on large rivers as conduits for excess nutrients to coastal zones, their role in processing and retaining nutrients has been overlooked and understudied. Empirical measurements of nutrient uptake in large rivers are lacking, despite a substantial body of knowledge on nutrient transport and removal in smaller streams. Researchers interested in nutrient transport by rivers (discharge >10000 L/s) are left to extrapolate riverine nutrient demand using a modeling framework or a mass balance approach. To begin to fill this knowledge gap, we present data using a pulse method to measure inorganic nitrogen. (N) transport and removal in the …