Global Population and the Nitrogen Cycle (PDF) - Looks at how the distribution of nitrogen on the earth has been changed in dramatic, and sometimes dangerous, ways by modern agricultural practices.
Introduction to Population Ecology - Includes a background of population studies, relevant figures and equations, links, and a bibliography.
Nearctica: Population Ecology - Offers links to general sites as well as those dealing with the population dynamics of individual species.
NERC Centre for Population Biology - Conducts basic research in population biology and related disciplines to understand and predict the functioning of ecological systems.
Simulations of Population Biology (POPULUS) - Software containing a set of simulations used to teach population biology and evolutionary ecology at the University of Minnesota.