CHECKPOINT SCIENCE WEEK 3

CHECKPOINT SCIENCE - Firstly we can hypothesize that salamanders developed aquatic capabilities because food resources were scarce on land and

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SUCCESSION 1 Succession Jaclyn Russo SCI/275 18:00:46 Melissa Filiaggi
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SUCCESSION 2 The bog in the animation is an example of secondary succession. Secondary succession is when there is a change in species composition because of a disturbance that destroys the existing vegetation. Primary succession is when there is a change in species composition when it was previously uninhabited. The bog is an example of secondary succession because there was already soil, trees and animals in the area. The dam that the beavers built resulted in flooding of the area, therefore killing trees and having that area start over again after the flood washed away and the forest floor grew again. According to Darwin’s theory, animals evolve to become stronger and more adapt to their surroundings; with that in mind that is why the salamanders may have evolved to become limbless.
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Unformatted text preview: Firstly, we can hypothesize that salamanders developed aquatic capabilities because food resources were scarce on land and therefore were required to enter the aquatic habitat to look for more food resources to survive. This is similar to the example of Darwin’s finches which developed beaks of different shapes and sizes so as to make use of the available food. As for why they evolved to become limbless, a possible reason would be to increase maneuverability to escape from predators in the water. The legs may hinder the speed of salamanders in water and thus increase the chances of being hunted by their predators. In addition, the speed of movement is also required so that the salamanders can catch their prey as well. I believe they evolved to be limbless so they can survive better in the aquatic environment....
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This note was uploaded on 08/05/2011 for the course SCI 125 taught by Professor Basic during the Spring '10 term at University of Phoenix.

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CHECKPOINT SCIENCE - Firstly we can hypothesize that salamanders developed aquatic capabilities because food resources were scarce on land and

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