Focal Group Questions- Coevolution between plants and herbivores - answers

Focal Group Questions- Coevolution between plants and herbivores - answers

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Focal Group Questions: Coevolution Zangerl and Berenbaum 2005 PNAS 1) What was the central result of this paper? By tracking levels of secondary metabolites in herbarium specimens, the authors showed that the introduction of the parsnip webworm to the US was positively associated with increased levels of furanocoumarins in the introduced parsnip. This evidence is consistent with the hypothesis of chemical coevolution between the webworm and the parsnip, post introduction. 2) Explain one possible bias of the data in this paper. If collectors of herbarium specimens avoid highly damaged plants this could result in (1) selection by the collectors for more resistant plants (although levels of resistance in specimens were not signif. greater than levels in current populations) or (2) if collector bias varied over time, this could influence the temporal pattern of furanocoumarin levels. 3) In our last lecture, we discussed factors maintaining genetic variation in populations. How might levels of genetic variation in the introduced
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Focal Group Questions- Coevolution between plants and herbivores - answers

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