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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

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.

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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:
In copyright, educational use permitted. Educational use includes non-commercial reproduction of text and images in materials for teaching and research purposes. For other contexts beyond fair use, including digital reproduction, please contact the University of Idaho Library Special Collections and Archives Department at libspec@uidaho.edu. The University of Idaho Library is not liable for any violations of the law by users.
Publisher:
University of Idaho
Contributing Institution:
University of Idaho
Type:
Text
Format:
application/pdf
Cataloger:
wbv
Date Digitized:
2012

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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:
In copyright, educational use permitted. Educational use includes non-commercial reproduction of text and images in materials for teaching and research purposes. For other contexts beyond fair use, including digital reproduction, please contact the University of Idaho Library Special Collections and Archives Department at libspec@uidaho.edu. The University of Idaho Library is not liable for any violations of the law by users.
Standardized Rights:
http://rightsstatements.org/vocab/InC-EDU/1.0/
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