@article {1494, title = {Effect of Stream Acidification on Periphyton Composition, Chlorophyll, and Productivity.}, journal = {Canadian Journal of Fisheries and Aquatic Sciences}, volume = {43}, year = {1986}, pages = {1846-1858}, author = {Mulholland, P.J. and Elwood, J.W. and Palumbo, A.V. and Stevenson, R.J.} }