ENVS200 Lecture Notes - Lecture 9: Trophic Cascade, Keystone Species, Secondary Succession

• School: University of Waterloo
• Department: Environmental Studies
• Course: ENVS200
• Professor: Anne Grant

Document Summary

9. 1 multiple determinants of the dynamics of populations. Regulation is the tendency of a population to decrease in size when it is above a particular level, but to increase in size when below that level. In other words, regulation of a population can, by definition, occur only as a result of one or more density-dependent processes that act on rates of birth and/or death and/or movement. The determination of the precise abundance of individuals will reflect the combined effects of all the factors and all the processes that affect a population, whether they are dependent of independent of density. No population can be absolutely free of regulation long-term unrestrained population growth is unknown, and unrestrained declines to extinction are rare and density-dependent processes are neither uncommon nor unimportant. The dynamics of individuals within patches (determined by the usual.