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midterm_2_answer_key-1 - Name ENT 104 Behavioral Ecology of...

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Name:_____________________________ ENT 104: Behavioral Ecology of Insects (Version A) /100pts Second Midterm Exam 02/27/2008 You have the whole class time (50 minutes). Please limit answers to one or two sentences at the most. *********************************************************************** * 1. Experimental evidence shows that there is a peak in feeding rate of a beetle that occurs just after dawn every day. In fact, that is the only time that they feed at all. You keep the beetles in the lab and have their day/night cycle set at 12 hours of dark and 12 hours of light. The lights come on at 6 AM and go off at 6PM. The beetles keep feeding under these conditions for several days. Now that the end of the quarter is here, you leave for a week, and at the same time, the lights stop working in the lab. The beetles are in the dark for 7 days. When you come back, you notice that the beetles now feed from 7:10 AM until 9:10 AM. a. Is their biological clock set for a period of more or less than 24 hours? (3) Longer b. How long (in hours and minutes) is the clock period? (3) 24 hours and 10 minutes 2. Sexual reproduction between two gametes of unequal form is called anisogamy (2) 3. In the “hawk and dove” scenario of competition, we discussed that the dove is not an evolutionarily stable strategy (ESS), whereas the hawk is sometimes an ESS. a. What is an ESS? (3) A strategy that when adopted by the majority of a population cannot be replaced by a competing strategy b. Why can the dove strategy never be an ESS? (3) If a hawk strategist enters a dove population, the hawks will displace the doves because the doves will not defend and the hawks will always fight c. What condition needs to be met to result in the hawk strategy being an ESS? (3) The value of the resource must exceed the cost of the contest, V>C
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Name:_____________________________ 4. In class, two opposing selection pressures were discussed in relation to how anisogamy likely evolved. One selected for large gametes and the other selected for small gametes.
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