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Flashy Fish

Flashy Fish. Sexual Selection. Gallery of Guppies. Guppy Predators. I love Guppies!. 3 Natural Guppy Pools Let’s observe guppies that live here and what they look like. Pool #1. Number of guppies: 75

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Flashy Fish

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  1. Flashy Fish Sexual Selection

  2. Gallery of Guppies

  3. Guppy Predators I love Guppies!

  4. 3 Natural Guppy Pools Let’s observe guppies that live here and what they look like.

  5. Pool #1 Number of guppies: 75 Average male coloration:Brightly multi-colored with large spotsPredators:Cichlids: 0Blue Acara: 0Rivulus: 12

  6. Pool #2 Pool 2Number of guppies: 83 Average male coloration:Medium coloration on body and tail, with medium-sized spotsPredators:Pike Cichlids: 0Blue Acara: 7Rivulus: 15

  7. Pool #3 Number of guppies: 110 Average male coloration:Drab coloration, very small spots concentrated near the tailPredators:Pike Cichlids: 17Blue Acara: 20Rivulus: 5

  8. 1) If being flashy attracts predators, why are male guppies so colorful? 2) What is responsible for the variations in color frequency in these guppies from one generation to the next? 3) Generate a hypothesis… Flashy Fish

  9. So why... If being colorful is going to get males killed, why hasn’t natural selection eliminated colorful guppies???

  10. Initial population: Mostly drabPredators: 30 Rivulus • Number of guppies: 227Number of generations: 5Number of weeks: 112 • Male color types:    Brightest: 42%    Bright: 7%    Drab: 18%    Drabbest: 34%

  11. …After 12 generations • Male color types:    Brightest: 95%    Bright: 1%    Drab: 3%    Drabbest: 2% • (numbers were rounded) Can you tell what happened to cause such a change in frequency? Was your 1st hypothesis supported? Do you want to change your hypothesis?

  12. Flashy Fish Let’s try another pool….

  13. Initial population: Even mixPredators: 30 Rivulus, 30 Acara, 30 Cichlids • Number of guppies: 171 • Number of generations: 4 • Number of Weeks: 57 • Male color types:    Brightest: 15%    Bright: 9%    Drab: 26%    Drabbest: 50%

  14. … after 7 generations • Number of guppies: 100Number of generations: 7Number of weeks: 203 • Male color types:    Brightest: 0%    Bright: 0%    Drab: 4%    Drabbest: 96% Was your new hypothesis supported? What conclusions can we draw? Complete your Data sheet and Discussion Questions.

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