Key points are not available for this paper at this time.
M. Proulx, F. R. Pick, A. Mazumder, P. B. Hamilton, D. R. S. Lean, Experimental Evidence for Interactive Impacts of Human Activities on Lake Algal Species Richness, Oikos, Vol. 76, No. 1 (May, 1996), pp. 191-195
Proulx et al. (Wed,) studied this question.