2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 9:45 AM - 10:00 AM | BRIDGING GREEN TO BROWN FOOD WEBS: PRODUCTION AND DECOMPOSITION OF DISSOLVED ORGANIC CARBON IN OVERLAPPING CONSUMER HOTSPOTS | 420 A
BRIDGING GREEN TO BROWN FOOD WEBS: PRODUCTION AND DECOMPOSITION OF DISSOLVED ORGANIC CARBON IN OVERLAPPING CONSUMER HOTSPOTS
Transfer of energy and nutrients from green to brown food webs is regulated by consumer activity. Dense aggregations of consumers may alter the abundance and stoichiometry of inorganic nutrients available to green and brown food webs and organic resources available to brown food webs. Overlap of consumer groups with different life histories and tissue element requirements may have further interactive effects on resource dynamics. We sought to understand the direct and indirect effects of overlapping consumer hotspots on the abundance and bioavailability of dissolved organic carbon (DOC). We used a mesocosm experiment crossing three levels of fish (Campostoma anomalum) and mussel (Amblema plicata and Actinonaias ligamentina) biomass and measured DOC and bioavailable DOC (BDOC) concentrations. We found that DOC and BDOC concentration decreased with increasing fish biomass and high mussel biomass. DOC concentration was not affected by nutrients, but BDOC decreased weakly with increasing ammonium concentrations. Both DOC and BDOC increased strongly with algal production. Our results suggest that consumers exerted an indirect top-down control on the abundance of bioavailable DOC produced from green food webs via controls on algal dynamics and to a lesser degree on nutrient availability.
- Nutrient Recycling
- Organic Matter
- Algae
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Presenters/Authors
Thomas Parr
(), U.S. National Park Service, thomas.parr@ou.edu;
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Caryn Vaughn
(), University of Oklahoma, cvaughn@ou.edu;
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Keith Gido
(), Kansas State University, kgido@ksu.edu;
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