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The species richness (number of large mammal species) is linearly related to reserve size (Figure 1). (Regression test: F1,4 = 14.332, P = 0.019)

Because the regression is significant, a linear model can be used to predict the effect of reserve size on species richness. The regression equation is:

y = 0.003x + 8.310, R2 = 0.782

Species richness scatter graph
Figure 1. Species richness against reserve size
(Source: Brashares, JS, Arcese, P and Sam, MK (2001) Human geography and reserve size predict wildlife extinction in West Africa. Proceedings of the Royal Society of London, Series B 268, 2473-8.)