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Industrial Melanism

Industrial Melanism. Peppered Moth 2 types: dark vs. light. light. Peppered moth. Peppered moth: Evolution in action. Year % dark % light 1848 5 95 1895 98 2 1995 19 81.  clean air, light-colored bark.  pollution, dark-colored bark.  Clean Air Act, light-colored bark.

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Industrial Melanism

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  1. Industrial Melanism • Peppered Moth • 2 types: dark vs. light light Peppered moth

  2. Peppered moth: Evolution in action Year% dark% light 1848595 1895982 19951981 clean air, light-colored bark pollution, dark-colored bark Clean Air Act, light-colored bark industrial melanism

  3. Peppered moth • Why did the population change? • early 1800s = pre-industrial England • low pollution • lichen on trees = light colored bark • late 1800s = industrial • factories = soot coated trees • killed lichen = dark colored bark • mid 1900s = pollution controls • clean air laws • return of lichen = light colored bark

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