This interactive explores examples of what can happen when there are changes in the population size of one species in an ecosystem. How are species at other trophic levels affected? How does the ecosystem change?Launch Click & Learn
- AP Biology (2012-2013)
- 2.A.1, 4.A.5, 4.A.6, SP7
- NGSS (2013) LS
- HS-LS2-6, HSLS2-8
335Short FilmsSome Animals Are More Equal than Others: Keystone Species and Trophic CascadesKeystone species and trophic cascades are fundamental concepts in ecology. This short film tells the story of how these concepts were first established through the pioneering experiments of two young researchers: Robert Paine and James Estes.
328Film GuidesFilm Guide for Some Animals are More Equal than OthersThe following classroom-ready resources complement the film Some Animals Are More Equal Than Others: Trophic Cascades and Keystone Species. It tells the story of the bold experiments by Robert Paine and James Estes, which established the importance of keystone species in regulating ecological communities and the cascades of effects set in motion by their removal.