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midterm1+key - NAME ENT 104 Behavioral Ecology of...

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NAME: ____________________________________________ ENT 104: Behavioral Ecology of Insects (Version A) First Exam 1/30/08 100 points total You have the whole class time (50 minutes). Please limit answers to one or two sentences at the most. TURN OFF YOUR CELL PHONES 1. A predatory beetle needs to eat 10 aphids per day to maintain minimum nutritional requirements. The aphids are distributed variably on the plant; some leaves have no aphids and some have as many as 20. a. What would the beetle do to forage in a risk-prone manner? (2) The beetle would forage on as many leaves as necessary to get 10 aphids per day. i.e. it would move from leaf to leaf. b. What would the beetle do to forage in a risk-averse manner? (2) It would stay on a single leaf and not move away. c. Based on Risk Sensitive Foraging Theory, would you expect this beetle to be risk- prone or risk-averse? (2) it will be risk prone if it is forced to (e.g. the leaf has <10 aphids), otherwise it will be risk averse if the leaf has 10 or more aphids. **1 mark given if you wrote risk prone/risk averse; full marks given if you explain why** 2. According to the Adaptionist Paradigm, 4 conditions are necessary for evolution by natural selection to occur. Name these 4 conditions. (4) a. heritable variability b. offspring production exceeds carrying capacity c. some individuals do better than others d. an agent of selection **if you wrote “those individuals with better traits survive and have more offsprings and these traits increase in frequency in the next generation” (or something like this), I viewed that as a description of the outcome of EBNS instead of a condition for EBSN.** 1
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NAME: ____________________________________________ 3. Draw the “gain curve” that is used when describing how animals optimize their foraging behavior. (2) Label the axes. (1) Label the point at which a bee foraging for nectar should leave the flower patch and return to the hive. (3) 4. Name 3 resources to search for OTHER THAN food where Optimal Foraging Theory might be employed as a theoretical framework. (3) a. mates, oviposition sites, hosts, shelter….anything really that they find more than one
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