A little off the beaten track for HN, but a classic paper in ecology that introduced the idea of trophic cascades: Hairston, Smith and Slobodkin. 1960. Commu

A little off the beaten track for HN, but a classic paper in ecology that introduced the idea of trophic cascades: Hairston, Smith and Slobodkin. 1960. Community structure, population control, and competition. American Naturalist 94: 421-425. see http://en.wikipedia.org/wiki/Trophic_cascade http://en.wikipedia.org/wiki/Trophic_cascade for more information