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Optimal Diet Choice Contingency Model Hypothesis: Fitness Increases with Increase in Individual’s Long-Term Average Rate

Explore the Contingency Model Hypothesis on diet choices, specializing or generalizing with two prey types, and extending to more than two prey types. The model parameters and prediction for greater energy gain are discussed. References from Krebs, Thompson, Davies, and Cantanhede et al. are included. The text language is technical and informative, citing studies and models on prey choice and energy gain optimization.

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Optimal Diet Choice Contingency Model Hypothesis: Fitness Increases with Increase in Individual’s Long-Term Average Rate

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

  2. Contingency Model Parameters: Encounter Rates I; I = 1, 2 Net Energetic Gain ei Handling Time hi Prediction: Greater rate of Energy Gain

  3. 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

  4. Krebs, J.R. et al. 1977. Anim. Behav. 25:30.

  5. Krebs, J.R. et al. 1977. Anim. Behav. 25:30.

  6. Thompson & Barnard. 1984. Anim. Behav. 32:554.

  7. Davies, N.B. 1977. J. Anim. Ecology 46:37. Pied Wagtail: Profitability Predicts Prey Choice

  8. Cantanhede et al. 2008. Neotrop. Icthyol. 6 Predator-fish diet narrows after impoundment increases density of preferred fish-prey.

  9. 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.

  10. Hawkes et al. 1982. Am. Ethnol. 9:379.

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