(12 points) Imagine an area containing 36 foragers and four patches having the f
ID: 147075 • Letter: #
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(12 points) Imagine an area containing 36 foragers and four patches having the following relative qualities (rates of food production): Patch A B C D Patch quality (insects per sec) x 2x 4x 5x 1. Assuming that these foragers are in an IFD, how many foragers would you predict to be found in each of the four patches? (you can simply put the predicted numbers under the patch quality numbers above). Are foragers feeding at the highest quality patch feeding at a higher rate than others? (yes or no) 2. Consider a 'hawk' and 'dove' situation where V 75. Witot weuld the cost of fighting need to be in order to have a population of" hawks' and 'doves, eventually become l 00% hawks? Show what the average payoffs for a hawk and a dove would be to confirm that the population would become 100% hawks. Would 100% hawks be an ESS? Explain. 3. For the following question, the box 4.2 section of the text will be very helpful. Consider a host species (blue and gold warbler) that normally lays five eggs in a clutch. They are sometimes parasitized by bronzed cowbirds, where the cowbird removes one warbler egg and replaces it with their own egg. Wteahaiches, it eventually expels all host eggs. The warbler hosts have evolved the ability :: :::::::::trd eggs; they correctly reject a cowbird egg in 75% of the instances that they are back of this page, draw a matrix showing the expected RS of warbler hosts in the fo accept all eggs) our different scenarios (parasitized vs. not) given rejection (always reject an egg) or acceptance (always Using numbers from the matrix that you produced, why does parasitism rate have such a strong influence on whether rejection behaviors would be selected for? (note: I am not asking you to calculate a critical parasitism frequency)Explanation / Answer
2. ESS means evolutionary stable strategy.
consider a hawk - hawk interaction. here, the hawk may gain B/2 calories or lose C/2 calories. this is the cost of fighting between hawk and hawk.
the average energy payoff for a hawk - hawk interaction will be (B-C)/2
in a hawk - dove interaction, there will be no cost of fighting as dove walks away. in hawk - dove and dove - hawk interaction, always hawk gets B calories. the average payoff of hawk here is B. and dove always gets 0.
in a dove - dove interaction, they do not fight but splits resource evenly. here, each player gets average payoff of B/2. the cost of fighting is 0 here.
if a mutant appears in the form of a dove or one wanders and enters hawk community, it will do quite well as its fitness is not lowered by fight. therefore, 100 % is also not a pure ESS.
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