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Example sentences for: possingham
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(For a general analysis, with the same qualitative results, see Possingham 1992.)
Possingham's model (1992) helps to explain the ecological association between flower colour and pollinator type, provided that both flower colours and pollinator types are present—but why did the red colouration of these flowers evolve in the first place?
Although refinements of Possingham's model, such as developing a prey-model version, or introducing stochasticity or several foraging constraints, might help us determine the extent to which we should expect resource partitioning along the colour dimension to take place, it is, in our view, far more pressing to determine the extent and conditions under which bees exploit red flowers (i.e.
What Possingham's model predicts, therefore, is that when the number of bees is large enough, all birds will forage at the red patch.
Of course, Possingham's model (1992) is not incompatible with birds being more efficient than bees at exploiting red flowers, and the results would be strengthened if, as has been suggested (Raven 1972; Chittka and Waser 1997), birds are better at detecting red flowers than blue ones.