Lake Malawi in Africa is home to about 200 species of allopatrically speciated cichlid fish. However, recent development around the lake is reducing the visabiliy in the lake, and as a result recently diverged species are merging back together. Why?

Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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Lake Malawi in Africa is home to about 200 species of allopatrically speciated cichlid fish. However, recent development around the lake is reducing the visabiliy in the lake, and as a result recently diverged species are merging back together. Why?

  A)

Because the geneflow between species has been reduced due to the reduction in visability

  B)

Because those species have not evolved a second reproductive isolation mechanism in addition to sexual selection

  C)

Because the open water habitat is no longer as habitable, so the open water species are now using the bottom habitat

  D)

Because the bottom habitat is no longer habitable, so the bottom habitat species are not using the open water habitat, leading to more hybridization

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