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Unformatted text preview: th prey type where V j /H j < V i / (T s + H i ) [Note: V = value (e.g., calories) for each prey type; T s = total search time; = "sum of"; H = average handling time for prey items of each prey type] Phrased in English, this rule says "Add prey types until the post-encounter return rate from a prey type is lower than the average rate of return for all higher-ranked prey types (including search time)" The optimal diet thus occurs at the point that "adding" prey types to diet, in descending rank order (most efficient to least) leads to a decrease in the overall rate of return [see Kelly 1995:85-86 for an example] Although optimal prey-choice model seems pretty formalized and abstract, the major elements actually correspond quite closely to concrete aspects of the foraging process, and its procedures are pretty straight-forward...
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- Fall '10