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Unformatted text preview: 2/17/2008 1 Population Ecology Population Ecology Reminder… Reminder… • Your 1 st lecture exam will be on Feb. 26 th covering all the material up through Thur. lecture • It will be multiple choice and true/false • You will need scantron form #882-E and a #2 pencil Figure 52.0 Monarch butterflies Factors that effect populations Factors that effect populations 1. Density- the number of individuals per unit area. How can you measure population density? 2/17/2008 2 Random plots Figure 52.1 Aerial census for African buffalo ( Syncerus caffer ) in the Serengeti of East Africa Factors that effect populations Factors that effect populations 1. Density- the number of individuals per unit area. 2. Dispersion – pattern of spacing • Clumped – most common, why? It implies some degree of attraction between members. • Uniform – also common (often result of social interactions, such as: competition, territorial defense, feeding zones around burrow, etc.). It implies some degree of repulsion among members. • Random – uncommon (if no particular forces shape the patterns of dispersal – wind dropping seeds). It implies that the location of any individual is independent of any other....
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