Non-target Taxa Monitoring
Ecological Risk Containment
“Supplementation is the use of artificial propagation in an attempt to maintain or increase natural production while maintaining the long term fitness of the target population, and keeping
ecological and genetic impacts on nontarget populations within specified biological limits.”
Containment Objectives
PowerPoint Presentation
Results Through 2006
- Status of most species remain within acceptable limits
- Notable Exceptions:
- -Steelhead size index (main stem Yakima)
- -Steelhead abundance index (tributary)
Teanaway
Basin
BACIP
Sites
Baseline Validation of
Control Sites
RBT Abundance in NFT Treatment vs. Control sites
Rainbow Trout and Spring Chinook Abundance
Hypotheses
- H1 Differential environmental effects
- H2 Differential angling effects
- H3 Supplementation activities
H1 – Environmental Differences
Slide 12
Slide 13
Large Scale Environmental Change
H2 - Differential Angling
- Is the decrease in abundance in treated areas (NFT) a result of differential angling pressure?
Index of Angling Pressure
H3 - Supplementation
- Does an increase in the abundance of the target taxa negatively affect O. mykiss abundance?
Abundance Trends in
North Fork Teanaway
(relative to control sites)
NP-SPC vs O. mykiss Abundance
North Fork Teanaway
SPC Smolts vs RBT Abundance (NFT)
Total Combined Biomass (RBT+SPC)
Summary
- Containment objectives for steelhead in the NFT have been exceeded
- Combined rearing salmonid biomass has been reduced (efficiency)
- Management action should be considered to contain impact and facilitate recovery
- Collect data during summer 2007 (have another data point to see if the trend continues)
End