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Extinction vs. New Species
“It is not the strongest of the species that survives, not the most intelligent that survives.
It is the one that is the most adaptable to change.” - Charles Darwin

EXTINCTION OR EVOLUTION? THE ANSWER ISN’T ALWAYS CLEAR

3/19/2019

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One fish, two fish, crayfish—new fish?

Though it might sound like the plotline of a Dr. Seuss book, that’s what actually happened to the threespine stickleback fishes of Canada’s Enos Lake. For thousands of years, two distinct species of these spiny silver sea creatures—known as the benthic sticklebacks and the limnetic sticklebacks, both descended from a single species—lived in peaceful coexistence. The former stayed near the floor, where they fed on bottom-dwellers; the latter swam up near the sun, eating insects at the surface. Their habitats and behaviors were so different that they rarely met, and never interbred. And all was well.

But then something strange happened: The two species of fish once again became one. How?

SMITHSONIAN

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  • Adventure & Exploration
    • Ancient Math: The Mystery of Notation
    • Human Capital: Final Frontier
    • Thought Leadership Series
    • The Politics of Education: The Reform Agenda
  • Learning Resources
    • Astronomy
    • Biology >
      • Extinction vs. New Species
    • Chemistry >
      • Chemistry of FIREWORKS
    • Earth Science
    • FORENSICS: APPLIED SCIENCES
    • Physics >
      • The Physics of DANCE
      • Physics of RIDES
      • Paideia
  • Ancient Battles
    • Hominoids: Physical Anthropology
    • Treasures & Shipwrecks
    • Pre-Colombian Civilization
    • Food & Migrations
    • Extinct Empires & Civilizations
    • Statesmen: Achievement of Politics
    • Paleolithic - Mesolithic - Neolithic Achievements
    • Hieroglyphs & Non-Phonetic Alphabets
  • About
  • Contact
  • Science & Christian Humanism