How to assume the islands have reached equilibrium

Your colleagues return from the South Pacific with data on island lizards. They found that there were more species of lizards on smaller islands than on larger islands. You can assume the islands have reached equilibrium with respect to species richness of lizards. Show (using both graphs and words) how the equilibrium theory of island biogeography could used to support the conclusion (despite the apparent contradiction). In aIDition include two other plausible explanations for this pattern.

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