Fully armored sticklebacks are common in oceans. When the fish moves to freshwater, it begins to show genetic variation over the years and becomes low-armored. The low-armored variety grows quickly and becomes too big and fast to be preyed upon by dragonfly larvae. Why does freshwater contain a greater number of low-armored sticklebacks?

Sticklebacks will face new difficulties when they transition from saltwater to freshwater, such as a shortage of predators or altered food sources. Some sticklebacks will eventually experience genetic alterations that will improve their ability to live and reproduce in their new environment.

Because it grows more quickly and gets too big and fast to be eaten by dragonfly larvae, which are common predators in freshwater habitats, the low-armored form of sticklebacks has a genetic advantage in this instance. Low-armored sticklebacks are hence more likely to survive and pass on their genes to the following generation.

There will be more low-armored sticklebacks in freshwater as a result of an increase in the proportion of low-armored sticklebacks in the population through time.

Natural selection is a crucial part of evolution and aids populations of organisms in better adjusting to their environment as it changes through time.

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