2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/27/2021 | 2:00 PM - 3:30 PM | AUTOTROPHIC AND HETEROTROPHIC RESPIRATION IN NORTHERN FORESTED RIVERS | Virtual Platform
AUTOTROPHIC AND HETEROTROPHIC RESPIRATION IN NORTHERN FORESTED RIVERS
Autotrophic respiration (AR) and heterotrophic respiration (HR) together compose ecosystem respiration (ER), and these processes are likely to differ in environmental controls because they are performed by different groups of organisms. AR should be closely tied to factors that influence primary production, such as light availability, while HR should be influenced by factors such as organic carbon availability. In northern forested streams, dissolved organic carbon (DOC) is the largest pool of organic carbon, and DOC can limit light availability. We hypothesized that HR would increase with DOC concentrations and that AR would decrease with increasing canopy cover and DOC. We measured gross primary production, ER, and environmental characteristics at 8 sites in 4 streams in the Upper Peninsula of Michigan, and used quantile regression to estimate AR and HR. Across the streams, AR showed no correlation with canopy cover (r = 0.47, p > 0.05) or DOC concentrations (r = -0.12, p > 0.05), and HR showed no correlation with DOC (r = 0.44, p > 0.05). Light and DOC may influence temporal patterns of AR and HR in these streams, as may other factors like flow and nutrient supply.
- Stream
- Organic matter
- Freshwater continuum
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Presenters/Authors
Renn Schipper
(), Michigan Technological University, rcschipp@mtu.edu;
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