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Evidence Appears Strong To Bolster Concept Of Co-Evolution, Scientists Say

id. "You see quite a balancing act. This occurred to a remarkable degree in three of the four populations that we observed."

To strengthen their case, the researchers examined pre-1900 museum specimens kept by the U. of I. Herbarium. They found that the furanocoumarin compound sphondin -- produced in high levels in today's parsnips -- was produced in low quantities or not at all in the museum specimens. It is sphondin, they found, that the webworms have a hard time metabolizing.

"They have no genetic variation to be able to metabolize it," Berenbaum said. "People have a hard time accepting the idea that plant traits represent a response to insect-caused damage. They assume that insects are minor annoyances to plants, like fleas on a dog, rather than major selective forces. We feel our data say that the evolutionary responses are reciprocal between these interacting species. This work also indicates how quickly plants can respond genetically to insect-caused damage."


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Contact: Jim Barlow, Life Sciences Editor
b-james3@uiuc.edu
217-333-5802
University of Illinois at Urbana-Champaign
3-Dec-1998


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