2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 10:00 AM - 10:15 AM | MIRROR MIRROR: THE ROLE OF HETEROTROPHY IN RUNNING WATERS IS INFORMED BY THE STRENGTH AND VARIATION IN THE RELATIONSHIP BETWEEN ER AND GPP | 251 AB
MIRROR MIRROR: THE ROLE OF HETEROTROPHY IN RUNNING WATERS IS INFORMED BY THE STRENGTH AND VARIATION IN THE RELATIONSHIP BETWEEN ER AND GPP
The cumulative metabolism of organic matter (OM) in running waters, captured by ecosystem respiration (ER), can alter the fate of bioreactive elements at landscape to global scales. However, our understanding of what shapes temporal patterns of ER in fluvial systems remains poor. Large datasets of continuous metabolism show that ER and gross primary production (GPP) fluctuate synchronously in some systems, but not in others. We assessed the variation in annual GPP-ER relationships across > 200 US streams and rivers spanning five orders of magnitude in drainage size. The slope of the GPP-ER regression, representing net ecosystem production, was tightly constrained among sites, particularly as drainage size increased. Mirroring between daily GPP and ER, represented by the regression R2, varied from zero to > 0.8 among sites, and tended to increase with drainage area. Finally, the intercept of the GPP-ER regression also varied among sites, but decreased with drainage area, suggesting that as system size increases, larger OM pools support elevated rates of baseline ER. Our results illustrate the utility of exploring GPP-ER coupling and provide insight into how controls over heterotrophic regimes may shift along river continua.
- Carbon
- Organic Matter
- Watershed
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Presenters/Authors
Amy Marcarelli
(), Michigan Technological University, ammarcar@mtu.edu;
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Ryan Sponseller
(), Department of Ecology and Environmental Science, Umeå University, 901 87 Umeå, Sweden, ryan.sponseller@emg.umu.se;
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Lily Kirk
(), University of Florida, lily33@ufl.edu;
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Maite Arroita
(), University of the Basque Country, maite.arroita@ehu.eus;
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Shai Arnon
(), Ben-Gurion University of the Negev, sarnon@bgu.ac.il;
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Michael Grace
(), Monash University , michael.grace@monash.edu;
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Eugènia Martí
(), Center for Advanced Studies of Blanes (CEAB-CSIC), Spain, eugenia@ceab.csic.es;
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William H. McDowell
(), University of New Hampshire, bill.mcdowell@unh.edu;
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Catalina Segura
(), Oregon State University, Catalina.Segura@oregonstate.edu;
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Amanda Subalusky
(), University of Florida, asubalusky@ufl.edu;
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Jennifer L. Tank
(), University of Notre Dame, tank.1@nd.edu;
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Flavia Tromboni
(), University of Nevada, Reno, ftromboni@unr.edu;
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Amber Ulseth
(), Sam Houston State University, amber.ulseth@epfl.ch;
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