Evolution Right Under Our Noses by Carl Zimmer
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Dr. Wirgin and his colleagues were intrigued to discover that the Hudson’s population of tomcod, a bottom-dwelling fish, turned out to be resistant to PCBs. “There was no effect on them at all,” Dr. Wirgin said, “and we wanted to know why.”
In March, he and his colleagues reported that almost all the tomcod in the Hudson share the same mutation in a gene called AHR2. PCBs must first bind to the protein encoded by AHR2 to cause damage. The Hudson River mutation makes it difficult for PCBs to grab onto the receptor, shielding the fish from the chemical’s harm.
The AHR2 mutation is entirely missing from tomcod that live in northern New England and Canada. A small percentage of tomcod in Long Island and Connecticut carry the mutation. Dr. Wirgin and his colleagues concluded that once PCBs entered the Hudson, the mutant gene spread quickly.
Carl Zimmer again does a good job of explaining science in an engaging way. It is interesting to learn about science and evolution in urban environments. Lots of life manages to survive the challenges of urban life and it is interesting to learn what scientists are finding about that life.
Related: Trying to Find Pest Solutions While Hoping Evolution Doesn’t Exist Doesn’t Work – Microcosm by Carl Zimmer – New Yorkers Help Robot Find Its Way in the Big City – Parasite Rex – Backyard Wildlife: Great Spreadwing Damselfly
Fixers Collective
Posted on November 9, 2010 Comments (2)
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Related: Fund Teacher’s Science Projects – Science Toys You Can Make With Your Kids – charity related posts
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