Evol Ecol Res 8: 765-783 (2006) Full PDF if your library subscribes.
Resource partitioning among flower visitors: extensions of Possingham’s model
Miguel A. Rodríguez-Gironés*
Estación Experimental de Zonas Áridas, General Segura 1, 04001 Almeria, Spain
Question: How robust is Possingham’s (1992) result that, when two nectarivore species compete for the nectar produced by two flower types, optimal foraging leads to resource partitioning?
Mathematical methods: Game theory. Each individual strives to maximize its own pay-off.
Key assumptions: Any number of nectarivore species and flower types, with like-flowers aggregated in patches. Nectar need not accumulate at a constant rate. Energy expenditure differs between flight and flower exploitation. Exploitation time increases with the amount of nectar in flowers. Pay-off can be the expected long-term net rate of energy intake, the foraging efficiency (net energy intake divided by energy expended), or the expected short-term net rate of energy intake.
Predictions: Two nectarivorous species may simultaneously exploit both flower types. This result, however, is extremely rare: the vast majority of parameter values lead to resource partitioning despite the removal of Possingham’s simplifying assumptions.
Keywords: exploitation competition, floral nectar, habitat selection, ideal free distribution, optimal foraging.
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