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Optimal Diet Choice Contingency Model Hypothesis: Fitness Increases with Increase Individuals Long-Term Average Rate of Energy Gain Two Prey Types: Specialize or Generalize? Extend to > 2 Prey Types

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Contingency Model Parameters: Encounter Rates I ; I = 1, 2 Net Energetic Gain e i Handling Time h i Prediction: Greater rate of Energy Gain

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Contingency Model Specialize: Otherwise, Take Both Prey Types Specialize: High Density, More Profitable Prey Type, Increase Energy of Type 1, Decrease Handling Time of Type 1

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Krebs, J.R. et al Anim. Behav. 25:30.

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Thompson & Barnard Anim. Behav. 32:554.

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Davies, N.B J. Anim. Ecology 46:37. Pied Wagtail: Profitability Predicts Prey Choice

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Cantanhede et al Neotrop. Icthyol. 6 Predator-fish diet narrows after impoundment increases density of preferred fish-prey.

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k (k > 2) Prey Types Given at least j types in optimal diet, add type (j + 1) if profitability of type (j + 1) exceeds current long-term mean rate of energy gain; otherwise, diet is optimal.

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Hawkes et al Am. Ethnol. 9:379.

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