| Autor: |
Watt, W. D.1 walton.watt@technologist.com, Scott, C. D.1, Zamora, P. J.1, White, W. J.1 |
| Předmět: |
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| Zdroj: |
Water, Air & Soil Pollution. Mar2000, Vol. 118 Issue 3-4, p203-229. 27p. |
| Abstrakt: |
The Atlantic salmon (Salmo salar) resource of eastern Canada is impacted by acid rain in the Southern Upland (Atlantic Coast) area of Nova Scotia. Salmon runs in this area have become extinct in 14 rivers, are severely impacted in 20 rivers, and lightly impacted in 15 rivers. Water chemistry and fish communities in nine Southern Upland salmon rivers were studied from 1982 to 1996 as part of the effort to monitor the effects of the emission control programs in Canada and the United States. There has been no statistically significant change in total ion content of Southern Upland river water, but there was a significant decline in sulfate levels that was balanced by an increase in organic anions, and declines in calcium and magnesium that were balanced by increases in sodium and potassium. A geochemical scenario is proposed to account for these chemical changes. River water pH levels showed no overall linear trend, but at borderline toxicity sites the year-to-year variations in pH were correlated with changes in juvenile salmon population densities. Ten fish species were collected, but none showed any significant overall time trend in population density. Fish species diversity was positively correlated with pH. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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