Interactions of baseflow habitat constraints: Macroinvertebrate drift, stream temperature, and physical habitat for anadromous salmon in the Calapooia River, Oregon

The Calapooia River in western Oregon supports a small winter steelhead trout (Oncorhynchus mykiss) population and historically supported spring Chinook salmon (Oncorhynchus tshawytscha). Early timber harvesting removed the riparian forest, and log transportation practices simplified the channel. Th...

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Bibliographic Details
Published in:Aquatic conservation 2017-06, Vol.27 (3), p.653-662
Main Authors: Danehy, Robert J., Bilby, Robert E., Owen, Sara, Duke, Steven D., Farrand, Alex
Format: Article
Language:English
Subjects:
Adults
Aquatic insects
Availability
baseflow
Biomass
Catchment area
Climate
Climate change
Complexity
Conservation
Discharge
Downstream
Drift
drift concentration
Fish
Food availability
Food resources
Food supply
Foods
Forest harvesting
Freshwater fishes
habitat
Habitats
Harvesting
Historical account
Individual rearing
Interactions
Larvae
macroinvertebrate drift
Macroinvertebrates
Oncorhynchus mykiss
Oncorhynchus tshawytscha
Pools
restoration
Riparian environments
Riparian forests
Rivers
Salmon
Salmonids
Shade
Spring (season)
stream temperature
Structures
Summer
Temperature
Temperature effects
Transportation
Trout
Upstream
Winter
Zoobenthos
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Summary:The Calapooia River in western Oregon supports a small winter steelhead trout (Oncorhynchus mykiss) population and historically supported spring Chinook salmon (Oncorhynchus tshawytscha). Early timber harvesting removed the riparian forest, and log transportation practices simplified the channel. Those disturbance legacies continue to affect fish habitat by limiting shade and channel complexity, complicating conservation efforts. To evaluate juvenile salmonid rearing potential, macroinvertebrate drift, thermal regime and physical habitat were measured at eight sites in 24 km of the upper river during late summer baseflow. Overall physical habitat was simple, with few functioning instream structures or pools. During the 22‐day drift study, flows declined and maximum site stream temperatures ranged from 23.1°C at the lower end to 16.4°C 24 km upstream. Macroinvertebrate drift concentrations ranged from 0.7–13.7 ind. m−3 with biomasses from 0.02–1.23 mg m−3. Drift concentration biomass was higher upstream (P = 0.006) than downstream and declined overall (P 
ISSN:1052-7613
1099-0755
DOI:10.1002/aqc.2756