2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 2:00 PM - 3:30 PM | DO HIGHER TEMPERATURES CHANGE THE BALANCE OF CARBON AND NUTRIENTS IN DETRITAL FOOD RESOURCES? | Virtual Platform
DO HIGHER TEMPERATURES CHANGE THE BALANCE OF CARBON AND NUTRIENTS IN DETRITAL FOOD RESOURCES?
Secondary production in forest streams depends on the quality and quantity of detritus. Colonization of detritus by microbes tends to increase its palatability to consumers, coincident with decreases in its ratio of carbon (C) to nutrients (e.g., ratio of C to nitrogen [N]). This is important for consumer nutrition because stream detritivores are elevated in N compared to the detritus they consume. As warming is expected to increase rates of microbial growth and C loss, we hypothesized that warming would lead to higher nutrient content in detrital material. In this study, we warmed a stream by ~2ºC and analyzed the C and N content of its detritus relative to pre-treatment and a reference stream (before-after, control-impact). Warming led to significantly lower detrital C:N in the warmed stream compared to the reference for buried and suspended fine particles (p = 0.006 and p = 0.002, respectively), while leaf litter C:N showed no trend with warming. Responses of coarse and fine particles may be driven by differences in microbial communities associated with these particle types (i.e. fungi vs. bacteria) and have important growth implications for different functional feeding groups of macroinvertebrates.
- Detritivore
- Nutrient cycling
- Carbon cycle
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Presenters/Authors
Mikey Fager
(), University of Georgia, mikeyfager@gmail.com;
ASHA DISCLOSURE:
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Nonfinancial -