2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/24/2021 | 2:00 PM - 3:30 PM | UNTANGLING TERRESTRIAL AND AQUATIC CONTROLS ON CARBON, NUTRIENTS, AND MICROORGANISMS IN ARCTIC STREAM NETWORKS | Virtual Platform
UNTANGLING TERRESTRIAL AND AQUATIC CONTROLS ON CARBON, NUTRIENTS, AND MICROORGANISMS IN ARCTIC STREAM NETWORKS
Many longitudinal differences in dissolved organic matter (DOM) exist in permafrost river networks. Downstream decreases in DOM biodegradability, age, and bulk concentration have been observed and interpreted as signs of in-stream microbial and photochemical processing. Alternatively or additionally, longitudinal patterns could be due to systematic differences in tributaries draining upland and lowland permafrost landscapes. Because vegetation type, flowpath, residence time, and microbial community differ with landscape position, the simple mixing of different water sources could create the observed longitudinal patterns of DOM in permafrost river networks. We tested this “dilution hypothesis” by quantifying DOM biodegradability and properties, microbial community, nutrient availability, and water chemistry in 140 catchments in Arctic Alaska ranging from 1-1000 km2. By comparing catchments of similar size but different landscape positions, we separated terrestrially-driven source effects from in-stream processing. We also used DNA amplicon sequencing to relate water chemistry and DOM biodegradability with microbial community.
- Carbon cycle
- Decomposition
- Microbial ecology
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Presenters/Authors
Griffin Houston
(), Brigham Young University, griffinahouston@gmail.com;
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Rebecca Frei
(), Brigham Young University, Department of Plant and Wildlife Sciences, beccafrei@gmail.com;
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Raymond Lee
(), Brigham Young University, raymond.lee@byu.edu;
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Tasha Griffin
(), Brigham Young University, natasha.a.griffin@gmail.com;
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Erin Jones
(), Brigham Young University, erinfjones3@gmail.com;
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Zachary Aanderud
(), Brigham Young University, zachary_aanderud@byu.edu;
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Arial Shogren
(), Department of Earth and Environmental Sciences, Michigan State University, shogrena@msu.edu;
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Frances Iannuci
(), University of Vermont, fiannucc@gmail.com;
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Jay Zarnetske
(), Department of Earth and Environmental Sciences, Michigan State University, jpz@msu.edu;
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Samuel Bratsman
(), Brigham Young University, Department of Plant and Wildlife Sciences, sbratsmanx@gmail.com;
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Benjamin Abbott
(), Brigham Young University, Department of Plant and Wildlife Sciences, benabbott@byu.edu;
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William Breck Bowden
(), University of Vermont, breck.bowden@uvm.edu;
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