2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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6/05/2017  |   11:00 AM - 11:15 AM   |  ECOSYSTEM METABOLISM IN TWO NORTHERN ARKANSAS FLOW REGIMES: EXPLORING FLOW-ECOLOGY RELATIONSHIPS IN THE OZARKS   |  302C

ECOSYSTEM METABOLISM IN TWO NORTHERN ARKANSAS FLOW REGIMES: EXPLORING FLOW-ECOLOGY RELATIONSHIPS IN THE OZARKS

The natural flow regime controls stream ecosystem processes and functions, but few efforts have examined stream metabolism explicitly within the context of flow regime. Recently, natural flow regimes have been classified within the Ozarks that can be used to establish flow-ecology relationships. We present results from a year-long metabolism study in six forested streams within the two dominant flow regimes in northern Arkansas. We used the single-station method to estimate annual gross primary production (GPP), ecosystem respiration (ER), and net ecosystem metabolism (NEM) in three streams dominated by runoff and groundwater inputs, respectively. We applied groundwater corrections where applicable. Stream types also differed in dominant substrate, number of no flow days, and number of flood events. GPP and ER tended to be greater in groundwater systems (p=0.06, p= 0.08). Net metabolism tended to be more heterotrophic in groundwater streams (p=0.20). Groundwater site metabolism ranged from -687 to 57 (+/- 218) g C m-2 y-1, while runoff sites ranged from -84 to -30 (+/- 16) g C m-2 y-1. Our work reveals potential flow class-specific variation in function within a biome.

  • C10 Biogeochemistry
  • C14 Hydroecology
  • S31 Moving forward in flow ecology: identifying and testing key hypotheses

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Presenters/Authors

Allyn Dodd (), Lyon College, allyn.dodd@lyon.edu;


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Doug Leasure (), University of Georgia, doug.leasure@gmail.com;


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Daniel Magoulick (), Arkansas Cooperative Fish and Wildlife Research Unit, University of Arkansas, danmag@uark.edu;


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Michelle Evans-White (), University of Arkansas, mevanswh@uark.edu;


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