The macroinvertebrates in a sewage-polluted aquifer |
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Authors: | L W Sinton |
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Institution: | (1) Hydrology Centre, Water and Soil Directorate, Ministry of Works and Development, P.O. Box 1479, Christchurch, New Zealand |
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Abstract: | A quantitative evaluation of stream temperature alterations due to a commercial forest harvesting practice and a research
treatment is presented. Summer maximum stream temperatures averaged 1 ° C higher in the commercial clearcut and 9 °C higher
in the clearcut-herbicided watershed than in the forested control. The largest average monthly temperature increase on the
commercial clearcut (2.2 °C) occurred during April; on the clearcut-herbicided basin it occurred during June (10.5 °C). Significant
changes in stream temperature were observed on both watersheds as early as February and as late as November.
Changes in minimum stream temperatures are presented in detail along with the impact on diel temperature fluctuations. Changes
in the stream temperature regimes of the clearcut watersheds from the headwaters to the mouth of the watersheds are also given.
Potential impacts of the stream temperature alterations on aquatic ecosystems are summarized in relation to stress limits
for brook trout and other organisms.
School of Forest Resources, Pennsylvania State University, University Park, PA 16802, U.S.A.
USDA Forest Service, Northeastern Forest Experiment Station, University Park, PA 16802, U.S.A. |
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Keywords: | stream temperature diel temperature fluctuations forest harvesting trout clearcutting best management practices |
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