The case for liming some Nova Scotia salmon rivers |
| |
| Authors: | Walton D Watt |
| |
| Institution: | 1. Fisheries Research Branch, P.O. Box 550, B3J 2S7, Halifax, Canada
|
| |
| Abstract: | Long range transport of H2SO4 has caused many Nova Scotian rivers to decline in pH to the point where their Atlantic salmon (Salmo salar) stocks have been destroyed or much diminished. Chemical records show a declining pH trend in N.S. rivers since the early 1950's. The annual variation in hydrogen ion activity is positively correlated with sulphate and Al and negatively correlated with organic anions. It is technically feasible to restore the acidified salmon habitat by the addition of limestone, and the total cost of mounting a liming program to restore the lost habitat has been calculated. The pre-acidification Atlantic salmon production capacity was estimated from physical habitat surveys and tag return data. The estimated costs of the liming program are much greater than the anticipated economic benefits of the salmon restoration. Present plans are for a small liming program to establish a series of refuges for the preservation of nuclei of native salmon stocks. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
