2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

5/21/2018 | 2:00 PM - 2:15 PM | EMERGENT METABOLIC REGIMES OF RIVER NETWORKS | 330 B

EMERGENT METABOLIC REGIMES OF RIVER NETWORKS

Recent advances in measuring, modeling, and synthesizing stream metabolic rates are improving our ability to disentangle the hierarchy of controls on primary productivity (GPP) in stream and river reaches. However, we still know very little about the emergent patterns of stream metabolism at river network scales. Here we explore whether the daily variation in metabolism within individual stream reaches culminates in an emergent river network metabolic regime. To estimate river network GPP, we applied a set of modeled productivity regimes common to streams and rivers to individual reaches within simulated Optimal Channel Networks (OCNs). We found that at the river network scale, daily GPP exhibits a bimodal annual regime with seasonal peaks during the spring and summer. Although GPP in headwater streams is relatively low, the cumulative influence of spring peaks in primary productivity across a large number of headwater streams is substantial at the network scale, and river network GPP is often maximized during the spring vernal window. Additional model scenarios will explore how the range and timing of river network metabolism is affected by watershed size as well as future shifts in climate and riparian land use.

Network
Metabolism
Light

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Presenters/Authors

Lauren Koenig (), University of Connecticut, Lauren.Koenig@uconn.edu;