2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

<< BACK TO AGENDA

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

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

Alba Argerich (), School of Natural Resources, University of Missouri, argericha@missouri.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Brooke Penaluna (), PNW Research Station, US Forest Service, brooke.penaluna@oregonstate.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Francisco A.T. Pickens (), Dept. of Fisheries and Wildlife, Oregon State University, andy.pickens@oregonstate.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Emilee Mowlds (), Dept. of Forest Engineering, Resources, and Management, Oregon State University, mowldse@oregonstate.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -