Extreme Climate Variance Sped Extinction Of Local Butterfly Populations, Researchers Say

©ScienceDaily Magazine. Source: Stanford University. May 15, 2002.


Answer these questions in complete sentences on a separate sheet of paper.

  1. Checkerspots are described as sedentary. What does that mean? Give checkerspot examples.
  2. Describe how hilltop female checkerspots reduce the risk of total hatch failure when laying eggs.
  3. Describe how the checkerspots were reduced to isolated populations with the arrival of Europeans.
  4. Describe two concerns we have about a population's extinction.
  5. How do humans contribute now to isolating populations?
  6. How is Dr. Ehrlich's study different from previous?
  7. What changed in 1971 to increase extinction rates?
  8. Why do the Jasper Ridge Bay checkerspot butterflies have three parts in their scientific name (Euphydryas editha bayensis)?
  9. What drove these checkerspot populations to extinction?
  10. What environmental factor has the greatest effect on checkerspot populations?
  11. What geologic event occurred when the extinction rates were last as high as they are now?
  12. The Pacific Northwest has many species of amphibians (salamanders, newts, frogs). These populations are becoming increasingly isolated by development. Most of these species are not quite as sedentary as the checkerspot butterflies. Imagine you are a county planner, describe how you could guide development to allow individuals to move from pond to pond, pond to woods, pond to vernal pool.