BAPTISTA LALALLA
Storyboard-Text
- ALLOPATRIC SPECIATIONBY: JUSTIN BAPTISTA11 - STEM
- HELP!! What is this strange environment I'm about to enter?
- There are so many of us!
- There is no more food or water for me!
- Iguanas were originally found on the South American mainland, but were brought to the Galapagos Islands by being blown out to sea during a storm or being set adrift on a fallen log. The iguanas that crossed over were already adapted to the environment on mainland South America, with small claws for climbing trees and eating leaves and green skin to match the foliage. This enabled them to avoid predators.
- I can't grip the rocks to eat food, and predators will eat me because I don't blend in!
- Iguanas reproduced rapidly on the Galapagos Islands, resulting in overproduction.
- Now, we can all grip onto the rocks and hide from predators!
- In this new environment, a large number of iguanas had to compete for food, water, and shelter.
- I have short claws for climbing trees and eating leaves, and green skin to match the foliage!
- Environmental pressures on organisms aided those with specific traits in thriving in their environments. Iguanas with large claws thrived on the Galapagos Islands because they needed to grip onto slippery rocks where they ate seaweed. To blend in with their surroundings and hide from predators, the iguanas' skin color changed to a blackish hue.
- HA! I can hide from predators by gripping the rocks!
- The surviving iguanas became more adapted to their environment through mutation and sexual reproduction. Through many generations, Galapagos iguanas with large claws that blended into their environment were more "fit" and produced more offspring with larger and larger claws and darker and darker skin. Organisms lacking these characteristics died out.
- The adaptation of iguanas to their environments was a speciation event, as the two species no longer resemble each other and have vastly different traits. South American iguanas have smaller claws that help them climb trees and eat leaves, and they are greenish in color to blend in with the foliage. Galapagos iguanas have large claws to grip slippery rocks and eat seaweed, and they are a blackish color to blend in.
- I have large claws for gripping slippery rocks and dark skin to match the rocks around me!
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