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The effects of river fluctuations resulting from hydroelectric peaking on selected aquatic invertebrates. Partial completion report, project A-035-IDA Item Info
- Title:
- The effects of river fluctuations resulting from hydroelectric peaking on selected aquatic invertebrates. Partial completion report, project A-035-IDA
- Authors:
- MacPhee, Craig; Brusven, M. A.
- Date Created (ISO Standard):
- 1974-01
- Description:
- Near-shore variation in number and weight of riffle insects was shown to be affected by changes in depth (15, 30 and 45 cm) and current velocity, interacting with date and station of sampling. This differential littoral distribution of riffle insects resulted in variation of the littoral community structure. In the non-fluctuating system, community diversity and diversity per individual decreased with increasing depths to 45 cm and current velocity to 1. 1 m/sec. Fluctuating flows appear to reverse the order of the community structure, i. e. , community diversity and diversity per individual increase with increasing depth to 45 cm and current velocity to 1. 1 m/ sec. A flow reduction exponentially increased the number of drifting insects in zones adjacent to the exposed substrate in the shoreline. Insects tested in the laboratory demonstrated variability in temperature-exposure tolerances. The case-bearing caddisfly, Dicosmoecus sp. , was generally more tolerant than the stonefly, Pteronarcys californica, at most temperature regimes. Older age-class nymphs of the latter were more tolerant than younger nymphs. Shore migration studies indicated stonefiies were much more successful in maintaining contact with the water column during flow reductions than caddisflies and mayflies; mayflies were most vulnerable.
- Subjects:
- macroinvertebrates flow velocity temperature effects
- Location:
- Clearwater River
- Latitude:
- 46.41
- Longitude:
- -116.2
- Collection:
- IWRRI
- Series:
- Water for Idaho
- IWRRI number:
- 197326
- Rights:
- Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
- Publisher:
- University of Idaho
- Contributing Institution:
- University of Idaho
- Type:
- Text
- Format:
- application/pdf
- Cataloger:
- wbv
- Date Digitized:
- 2012
Source
- Preferred Citation:
- "The effects of river fluctuations resulting from hydroelectric peaking on selected aquatic invertebrates. Partial completion report, project A-035-IDA", Idaho Waters Digital Library, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iwdl/items/iwdl-macphee_1973.html
Rights
- Rights:
- Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/