stream degradationの例文

例文

1. The declines have been blamed on a variety of causes : primarily dams, but also stream degradation, overfishing and warm ocean temperatures.
2. "Castor canadensis " were re-introduced to the Tahoe Basin by the CDFG and the U . S . Forest Service between 1934 and 1949 in order to prevent stream degradation and to promote wetland restoration.