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5/24/2018 | 9:15 AM - 9:30 AM | NUTRIENT-STIMULATED DETRITAL LOSS RATES FROM LITTERBAGS ARE PREDICTIVE OF LOSSES AT STREAM REACH SCALES | 321

NUTRIENT-STIMULATED DETRITAL LOSS RATES FROM LITTERBAGS ARE PREDICTIVE OF LOSSES AT STREAM REACH SCALES

Excess nutrients increase detrital loss rates in streams, resulting in less carbon (C) for consumers and for functions such as uptake of pollutants. Our long-term experimental nutrient additions increased C loss rates from streams across nutrient concentrations and ratios. To evaluate the use of litterbag studies as indicators of nitrogen (N) and phosphorus (P) effects on stream-reach C loss, we compared breakdown rates (k) from litterbags with stream-reach loss rates. Stream-reach loss rates were best correlated with the lowest quality litter (e.g., R2 = 0.6), but medium quality was closer to the 1:1 line of stream-reach:litterbag rates, consistent with mixed litter composition in whole streams. At both scales, we found significant effects of both N and P, with P effects consistently greater (1.4-2.0?) than N effects based on standardized parameter estimates. Our studies provide support for the use of litterbag studies in predicting the effects of N and P enrichment on larger-scale C loss processes. Our results also suggest that low-quality litter species may be most sensitive in their responses to added nutrients, capture stream-reach loss dynamics most precisely, and thus may be most useful in monitoring and management applications

Nutrients
Eutrophication
Management

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Presenters/Authors

Amy D. Rosemond (), University of Georgia, rosemond@uga.edu;