IB144 assignment 10 territoriality_KEY

IB144 assignment 10 territoriality_KEY - Where the...

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Animal Behavior IB C144 Weekly Take-home assignment December 1-3, 2009 Territoriality You decide to repeat Carpenter and MacMillen’s classic study on a threshold model of feeding territoriality in nectivorous birds. Since you can’t get to Hawaii to study the Hawaiian Honeycreeper, you study the local Berkeley Long-billed Thistle Sucker. After months of observation creating a data base to generate a time-energy budget for territorial and non-territorial individuals, you calculate that the basic cost of living for non- territorial Thistle-suckers is 30 kcal./day. The vigorous displays and pursuits of territorial birds costs an additional 20 kcal./day. The inflorescences on which the Thistle-suckers feed yield 5 kcal worth of nectar each day. Where the inflorescences occur without territorial Thistle-suckers defending them, half of the nectar is taken by birds and bees.
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Unformatted text preview: Where the inflorescences are defended by territorial Thistle-suckers, 100% of the nectar produced by the inflorescences is available to the territorial bird. With this information, answer the following questions. 1. (3 points) What is the total cost in kcal./day to a territorial Thistle-sucker? (30 + 20 = 50 Kcal./ day) 2. (3 points) What is the lower threshold in number of flowers that a bird has access to that would allow it to be territorial? (E + T = 50 kcal/ day; 50 kcal/ day / 5 kcal/day = 10 flowers) 3. (4 points) What is the upper threshold in number of flowers available that it would not be worth a bird exhibiting territorial behavior. (E = 30 kcal/day; E < aP = 30 < .5P; P = 60 kcal/day = 60 kcal/day / 5 = 12 flowers)...
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