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Lecture 18 - Lecture 18 1 Armbrusters Work All on the Asian...

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Lecture 18 1) Armbruster’s Work – All on the Asian Tiger Fly a) They produce aquatic larvae, which undergo ecdysis, develop into pupae, and complete metamorphosis. b) Invaded from Japan via a shipment in 1985. How do the Florida populations evolve to become different from the New Jersey populations? i) Collected 3 populations each from NJ, TX, and FL. Put individual larvae into a culture well on a plate. ii) Larger females can lay more eggs (pupal mass), and pupal development time are two factors which affect development. iii) Body Size Cline – Northern populations (of any insect) tend to have larger body mass. This held true in the lab, where flies grown at cooler temperatures (over about 4 years) grew to have a larger body mass. (1) There was no compelling evidence to reject the null hypothesis, however. (2) Questions: Insufficient time, no selection for body size? iv) To test for this: If they’ve only been in the U.S. since 1985 (not enough time), go sample species from Japan to test for selection in body size there.
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