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chapter_7_lectures_a_1_slide_per_page - FEEDING BEHAVIOR...

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FEEDING B EHAVIOR
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Optimalit • Based on assumption tha individuals that maximiz unit time • Therefore individuals s Therefore, individuals sh patch choices, individua foraging-related choice foraging related choices per unit time ty Models at selection will favor ze net energy intake per hould make foraging ould make foraging al prey choices, and other that maximize net intake that maximize net intake
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Prey-dropping Be • Carry hard-shelled mollu into the air • Drop prey on hard surfac Do they behave optima • Do they behave optimall – Prey choice? – Height of drop? – Persistence with unbroke ehavior of Crows uscs and other food up ce ly in terms of y in terms of: en shell?
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Behavior of crows Behavior of crows f Observ • Crows select only large • Crows typically fly up Crows typically fly up a whelks Crows keep trying unti • Crows keep trying until many repetitions require foraging on whelks: oraging on whelks: vations whelks bout 5 meters to drop bout 5 meters to drop whelk breaks even if whelk breaks, even if ed
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Behavior of crows Behavior of crows f Observ • Is this behavior “optimal?” foraging on whelks: oraging on whelks: vations
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Predic • Large whelks should be small ones after a drop o
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This note was uploaded on 10/20/2009 for the course NPB 102 taught by Professor Hahn during the Winter '09 term at UC Davis.

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chapter_7_lectures_a_1_slide_per_page - FEEDING BEHAVIOR...

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