Factors Affecting Demographic Traits

A bewildering variety of ecological factors can affect plant demographic traits in very different manners. Most of these factors may act in concert at different phases throughout the life cycle and strongly influence population dynamics. Moreover, these factors are usually identified as strong selective pressures acting on different variants represented in a plant population. The most relevant factors are the following:

Figure 6 Dead beech (Fagus sylvatica) in the understory of a beech forest in the Montseny Natural Park (NE Spain). Competition for resources is an important factor affecting survivorship of seedlings and saplings in the understory of many forest types. Photograph courtesy of Ferran Roda.
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