2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 11:15 AM - 11:30 AM | RESPONSES OF STREAM FUNCTIONAL PROCESSES TO THE MANIPULATION OF FISH AND AMPHIBIANS | 330 A
RESPONSES OF STREAM FUNCTIONAL PROCESSES TO THE MANIPULATION OF FISH AND AMPHIBIANS
Extreme flow events are becoming more common and less predictable, leading to a pronounced pattern of contraction and expansion of the stream network and a change in both habitat availability and density of organisms. Although we start to understand how the structure of the aquatic community responds to droughts and floods, little is known about how these changes cascade into stream functional processes. Here we present results of a multi-year field experiment where we examined the effects of the manipulation of large aquatic consumers’ densities on stream functional processes in streams at the HJ Andrews Experimental Forest (Cascades Range, Oregon). During three years, we created a reach with natural, depleted, and elevated densities of fish and amphibians. For 40 days, we measured changes in ecosystem respiration, primary production, and ammonium uptake. In 2015, under extreme drought conditions, we expanded the experiment to three different sites within the stream network. Our findings indicate that large aquatic consumers affect stream functional processes and that the magnitude of change is density-dependent. Net primary production, among all measured functional processes, was the most sensitive to changes in consumer’ densities.
- Structure
- Ecosystem
- Metabolism
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Presenters/Authors
Alba Argerich
(), School of Natural Resources, University of Missouri, argericha@missouri.edu;
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Brooke Penaluna
(), PNW Research Station, US Forest Service, brooke.penaluna@oregonstate.edu;
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Francisco A.T. Pickens
(), Dept. of Fisheries and Wildlife, Oregon State University, andy.pickens@oregonstate.edu;
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Emilee Mowlds
(), Dept. of Forest Engineering, Resources, and Management, Oregon State University, mowldse@oregonstate.edu;
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