2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 10:15 AM - 10:30 AM | OVERLAPPING CONSUMER HOTSPOTS: TOP DOWN AND BOTTOM UP INTERACTIONS IN THE GREEN FOOD WEB | 420 A
OVERLAPPING CONSUMER HOTSPOTS: TOP DOWN AND BOTTOM UP INTERACTIONS IN THE GREEN FOOD WEB
Mobile fishes and sedentary mussels generate patches of nutrient regeneration (hotspots) in streams that can overlap at low flows when they are concentrated in the same habitat, but are more diffuse at higher flows as fish disperse. We used flow-through mesocosms to examine how the degree of overlap between these consumer groups influences production in the green food web. To simulate variation in consumer overlap with hydrology, we manipulated mussel biomass (2 species, 3 biomass levels) and fish biomass (1 species, three biomass levels) and measured nutrient dynamics, algal biomass and secondary production for 16 weeks. Mussel effects on N availability changed over time, with positive effects in early weeks, and weaker, negative effects later on. In contrast, fish increased N availability throughout the experiment. Both consumer groups increased P availability, but this effect was dampened when they overlapped. Differential effects on nutrient availability led to differences in stoichiometric ratios, with fish increasing water N:P ratios but mussels having no significant effects. Both consumer groups decreased algal biomass when alone, but these effects were weaker when they overlapped, likely due to an interaction of stoichiometric constraints and grazing.
- Nutrient Recycling
- Fish
- Hotspot
Presentation:
This presentation has not yet been uploaded.
Handouts:
Handout is not Available
Transcripts:
CART transcripts are NOT YET available, but will be posted shortly after the conference
Presenters/Authors
Caryn C. Vaughn
(), University of Oklahoma, cvaughn@ou.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Thomas Parr
(), University of Oklahoma, Thomas.parr@ou.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Traci DuBose
(), University of Oklahoma, tracipopejoy@ou.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Garrett Hopper
(), Kansas State University, ghopper@ksu.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -