Description
The rise in abundance of algae in coastal waters is thought to be due
to increases in nutrients such as nitrate and other forms of nitrogen.
Researchers gathered data to gauge the evidence that nitrates in the
discharges of rivers around the world are associated with human
population density.source
Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A
Course in Methods of Data Analysis (2nd ed), Duxbury.References
Cole, J.L., Peierls, B.L., Caraco, N.F. and Pace, M.L. (1993).
Nitrogen Loading of Rivers as a Human-driven Process, in
McDonnell, M.J. and Pickett, S.T.A. (eds.) Humans as Components
of Ecosystems: The Ecology of Subtle Human Effects and Populated
Areas, Springer-Verlag.