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Unformatted text preview: S 1 = S 2 But as Type 1 preferred, S 1 increases Now Type 2 is more profitable ( E 2 / h 2 ) > E 1 /(S 1 + h 1 ) When to switch? At S 1 S 1 > ((E 1 h 2 )/ E 2 ) - h 1 S 1 = threshold search time Where to forage? Patch choice Where is the competition worst? Ideal Free Distribution Match group size to rate of food ??? 144: Foraging 6 Nov 09 3 Ducks match bread-throwing rate Other factors: predation Dugong (Shark Bay) Sea grasses: cropping vs. excavation Other factors: starvation Yellow-eyed junco Two patches Variable 0 or 10 seeds Constant Always 5 Choice varies with temperature Cold , choose Variable Warm , choose Constant...
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- Fall '09