Natural Selection

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  • Survival of the Undetectable
  • By: Edgar Devora Period 3, Honors Biology
  • Natural selection, we’ve all heard it. It is when the environment chooses which traits are advantageous, but that doesn’t always mean needing strength to survive. There are other characteristics that help organisms survive and reproduce. Natural selection plays a part in not only in our lives, but in all organisms, including sharks.
  • These sharks have been all affected by natural selection. This population of sharks have individuals that differ slightly from one another genetically. Despite these small differences, these genetic variations can play a huge role on each shark’s survival. So who will be more likely to survive and reproduce? Well first, you have to see what traits are considered “advantageous” in this specific environment.
  • In the Euphotic zone (sunlit), sharks have adapted to catch prey by camouflaging with the ocean. The darker color is on the the top of the shark so that when prey who are above them see them, they are hard to distinguish from the dark water below. However, when a prey is below them, they see the sharks’ white belly which blends into the sunlight that penetrates the water from above(known as countershading). This makes it perfect for sharks to hide and eat their prey without them noticing.
  • Where could those sharks be?
  • What a wonderful day without sharks.
  • Like I said before, each population has genetic variations that slightly distinguish one another. In these sharks, some have darker tops than others. This may not seem like such a difference in the short term, but over a lifetime and generation, it can change an entire population.
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