28%20Oct%20Scatter%20hoarding

28%20Oct%20Scatter%20hoarding - = < 60% diet 144:...

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144: Scatter hoarding 28 Oct 09 1 Clark’s nutcracker • Crow family • Piñon seeds • Sublingual pouch –10,000 caches –Up to 22 km –Southern slopes • Nestlings Black-capped chickadee: memory in captivity Caching routes by Alvin 2 Day Delay 1 2 3 4 5 6 7 8 9 10 Retrieval routes 9 6 8 5 4 10 3 1 7 2 1 meter Merriam’s kangaroo rat • Nocturnal • Solitary • Scatter hoarder • 35 g body weight • Long-lived (< 8 yrs)
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144: Scatter hoarding 28 Oct 09 2 Spatial knowledge important Scatter hoarders more accurate 0 10 30 40 50 20 Zero Landmarks 16 Landmarks Scatter hoarder Larder hoarder No. Sites Searched Scatter hoarders have bigger hippocampus Species differences in the Crow family • Clark’s nutcracker •High Alpine; 100% diet • Pinon jay •Social cachers, medium altitude •20,000 seeds = 70-90% diet • Mexican Jay –Less caching but high altitude • Scrub jay •lower altitude •6,000 seeds
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Unformatted text preview: = < 60% diet 144: Scatter hoarding 28 Oct 09 3 Radial Arm Maze er or • 4 baited • Delay • 4 baited Operant Conditioning: Delayed Matching Task Spatial location LEFT RIGHT Color 1. Sample Phase (1 of 2) 2. Delay 3. Choose Phase (1 OR 2?) Clarks better only on spatial Why doesn’t the dark-eyed junco… …think like a black-capped chickadee? 144: Scatter hoarding 28 Oct 09 4 They focus on different sets of cues Extra-Array (EX) Intra-array (IN) Unique Feature (UF) 3 TYPES 1. Extra-array 2. Intra-array 3. Unique Feature Fox squirrels use hierarchy- Vertical maze Michael Shiflett - Individually marked (N=27) Hierarchy EX > IN > UF Buy? Pass? Buy and hold? CACHE Buy and sell? EAT What’s it worth? When to sell? What is everyone else doing? I’m going nuts!...
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This note was uploaded on 02/11/2010 for the course IB Animal Beh taught by Professor Lacey during the Fall '09 term at Berkeley.

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28%20Oct%20Scatter%20hoarding - = < 60% diet 144:...

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