Learning Objectives
7.4.1 Evaluate the environmental conditions that would favor the persistence of r-selected and Ê-selected species.
7.4.2 Describe the trade-offs in plant allocation described in Grime’s competitive/stress/ruderal model.
7.4.3 Show how differences in species size or age can be accounted for in describing the allocation of energy and resources to reproduction and other life history stages.
Ecologists have proposed several classification schemes for organizing patterns of life history traits in relation to the environment. Most of these schemes make broad generalizations about associated life history traits and attempt to place these associations along continua between two extremes that are shaped by the ecological conditions that influence mortality rates and resource availabilities. In this section, we examine the most prominent of these schemes and discuss how they relate to one another.
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