| Autor: |
Huckabee, John W., Goodyear, C. Phillip, Jones, Ronald D. |
| Zdroj: |
Transactions of the American Fisheries Society; October 1975, Vol. 104 Issue: 4 p677-684, 8p |
| Abstrakt: |
After the completion of a highway construction project in Great Smoky Mountains National Park in 1963, a fish kill was noted in a small stream draining an area of roadbed fill. After 10 years, the stream remained devoid of fish for at least 8 km downstream from the fill. The downstream water had a pH of 4.5 to 5.9; upstream from the fill the pH was 6.5 to 7.0. The rock material in the fill contains iron sulfide minerals. Other streams in the area flowing on the sulfide-rich rocks also showed low pH values. Survivability tests and stream surveys showed that brook trout cannot tolerate conditions in the stream below the road fill or in a stream flowing over natural outcrops of the same rock used in construction of the road fill. Native salamanders were also adversely affected downstream from the road fill. Chemical analyses of stream water and leaching tests indicated that lowered pH and increased sulfate and metals concentrations derived from the leaching of the sulfide-rich rocks were responsible for the trout and salamander mortalities. |
| Databáze: |
Supplemental Index |
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