Overhunting of the elephant seal dramatically reduced its numbers in the 1800s.The population has since increased,but due to the _____________ effect its genetic diversity is still very low.

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The situation described is characteristic of a bottleneck effect, which occurs when a population is drastically reduced in size and subsequently rebounds, but with limited genetic diversity due to the surviving individuals being a small representation of the original population.

Overhunting of the Elephant Seal Dramatically Reduced Its Numbers in the 1800s.The