Milkweed's evolutionary approach to caterpillars
http://www.huliq.com/64805/milkweed039s-evolutiona [2008-7-25]
Tag : latex tubes
Milkweed is the latest example of this response, according toCornell research suggesting that plant may be shifting away fromelaborate defenses against specialized caterpillars toward a moreenergy-efficient approach. Genetic analysis reveals an evolutionarytrend for milkweed plants away from resisting predators to puttingmore effort into repairing themselves faster than caterpillars --particularly the monarch butterfly caterpillar -- can eat them.
"An important question with co-evolution is where does it end?"said Anurag Agrawal, Cornell associate professor of ecology andevolutionary biology and lead author of a paper in the currentissue of the Proceedings of the National Academy of Sciences. "Oneanswer is when it becomes too costly. Some plants seem to haveshifted away from resisting herbivory [plant eating] and have takenthat same energy and used it to repair themselves."
The paper is important because it sheds light on key theories ofco-evolution, claiming that pressure by foraging insects makesplants diversify as they evolve new defensive strategies and thatsuch diversification follows trends in one direction or another,said Agrawal.
Milkweed is the latest example of this response, according toCornell research suggesting that plant may be shifting away fromelaborate defenses against specialized caterpillars toward a moreenergy-efficient approach. Genetic analysis reveals an evolutionarytrend for milkweed plants away from resisting predators to puttingmore effort into repairing themselves faster than caterpillars --particularly the monarch butterfly caterpillar -- can eat them.
"An important question with co-evolution is where does it end?"said Anurag Agrawal, Cornell associate professor of ecology andevolutionary biology and lead author of a paper in the currentissue of the Proceedings of the National Academy of Sciences. "Oneanswer is when it becomes too costly. Some plants seem to haveshifted away from resisting herbivory [plant eating] and have takenthat same energy and used it to repair themselves."
The paper is important because it sheds light on key theories ofco-evolution, claiming that pressure by foraging insects makesplants diversify as they evolve new defensive strategies and thatsuch diversification follows trends in one direction or another,said Agrawal.
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