2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 3:00 PM - 3:15 PM | ECOSYSTEM METABOLISM APPARENT TEMPERATURE SENSITIVITY VARIES ACROSS A SUB-ALPINE STREAM NETWORK | 306C
ECOSYSTEM METABOLISM APPARENT TEMPERATURE SENSITIVITY VARIES ACROSS A SUB-ALPINE STREAM NETWORK
Ecosystem metabolism defines the autotrophic and heterotrophic energetics within an ecosystem. Water temperature drives, in part, both ecosystem respiration (ER) and gross primary production (GPP). We estimated daily fluxes of ecosystem metabolism in 15 streams for 12 to 18 months across a 254-km2 sub-alpine network in Austria. To study the sensitivity of ecosystem metabolism to temperature, we quantified apparent temperature sensitivity for GPP and ER as described by Arrhenius kinetics. Network-wide ER activation energy (AE) was lower (<0.60 eV) than the expected range for metabolism kinetics, varying 2-fold across individual sub-catchments. Network-wide AE for GPP was 3-fold greater than predicted based on metabolism kinetics alone and varied across sub-catchments from 0.2 to 1.8 eV. This variability in AE of ER and GPP within a single stream network indicated that individual streams likely would respond differently to changing environmental conditions, dependent on local factors such as organic matter quality and nutrient resources. Despite the variability of AE for ecosystem metabolism across the network, ER AE was negatively correlated with GPP AE, indicating a close coupling of these metabolic processes.
- C32 Primary and Secondary Production
- C31 Organic Matter Processing
- C20 Climate Change
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Presenters/Authors
Amber Ulseth
(), Sam Houston State University, amber.ulseth@epfl.ch;
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Gabriel Singer
(), University of Innsbruck, gabriel.singer@uibk.ac.at;
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Tom Battin
(), Ecole Polytechnique Fédérale de Lausanne, tom.battin@epfl.ch;
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