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Effects of reduced stream discharge on fish and aquatic macroinvertebrate populations: Phase II. Research technical completion report, B-053-IDA Item Info
![Wild juvenile rainbow-steelhead trout responded to seasonal 95 percent reductions in discharge by emigrating from the test channel. An intermediate (50 percent) reduction in discharge during the 1980 tests resulted in little change in number or biomass. Most emigration occurred during the first night following the 95 percent flow reduction and was predominantly upstream. Since aquatic insects drifted catastrophically during the 24 hours following flow reduction, habitat changes, rather than food limitation, are indicated as the causative factor. Evaluation of changes in microhabitat utilization by juvenile trout showed that mean fish depth increased slightly with flow but was similar between seasons. [...] Juvenile rainbow-steelhead trout were closely associated with cover during summer and fall with the distance to cover decreasing with decreases in discharge. [...] Data point to the importance of habitat-component interactions. [...] Species diversity and insect functional groups showed little response to reduced flows. [...] Reduced flows had little effect on the hyporheic insect community. [...] An evaluation and critique of the 1978 version of the IFG4 model is provided.](https://objects.lib.uidaho.edu/iwdl/small/iwdl-198514_sm.jpg)
- Title:
- Effects of reduced stream discharge on fish and aquatic macroinvertebrate populations: Phase II. Research technical completion report, B-053-IDA
- Authors:
- White, Robert G.; Bingham, Allen E.; Milligan, James H.; Bruvsen, Merlyn A.; Corraino, Charles A.
- Date Created (ISO Standard):
- 1985-03
- Description:
- Wild juvenile rainbow-steelhead trout responded to seasonal 95 percent reductions in discharge by emigrating from the test channel. An intermediate (50 percent) reduction in discharge during the 1980 tests resulted in little change in number or biomass. Most emigration occurred during the first night following the 95 percent flow reduction and was predominantly upstream. Since aquatic insects drifted catastrophically during the 24 hours following flow reduction, habitat changes, rather than food limitation, are indicated as the causative factor. Evaluation of changes in microhabitat utilization by juvenile trout showed that mean fish depth increased slightly with flow but was similar between seasons. [...] Juvenile rainbow-steelhead trout were closely associated with cover during summer and fall with the distance to cover decreasing with decreases in discharge. [...] Data point to the importance of habitat-component interactions. [...] Species diversity and insect functional groups showed little response to reduced flows. [...] Reduced flows had little effect on the hyporheic insect community. [...] An evaluation and critique of the 1978 version of the IFG4 model is provided.
- Subjects:
- Trout Macroinvertebrates Streamflow water depth
- Collection:
- IWRRI
- Series:
- Water for Idaho
- IWRRI number:
- 198514
- Rights:
- Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
- Publisher:
- Idaho Water Resources Research Institute; University of Idaho
- Contributing Institution:
- University of Idaho
- Type:
- Text
- Format:
- application/pdf
- Cataloger:
- KIT
- Date Digitized:
- 2017-08-31
Source
- Preferred Citation:
- "Effects of reduced stream discharge on fish and aquatic macroinvertebrate populations: Phase II. Research technical completion report, B-053-IDA", Idaho Waters Digital Library, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iwdl/items/iwdl-198514.html
Rights
- Rights:
- Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/