Evolution in Hawaii A Supplement to 'Teaching About Evolution and the Nature of Science' (2004) / Chapter Skim
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An Adaptive Radiation Has Led to a Dramatic Diversification of the Drosophilids in Hawaii
An Adaptive Radiation Has Led to a Dramatic Diversification of the Drosophilids in Hawaii
Pages 14-19
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From page 14... ...
For example, many of the fish species that live in Hawaii receive continued immigrants from surrounding regions and remain genetically linked to species distributed throughout the Pacific. Alternately, a newly established species in Hawaii could evolve into one or more new species.
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From page 15... ...
Similarly, DNA sequences generally are more similar between closely related species than they are between more distantly related species. Genetic sequences accumulate changes over the generations as DNA randomly mutates and is influenced by natural selection or other evolutionary processes.
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From page 16... ...
The great ecological diversity of the Hawaiian islands also plays a role in adaptive radiations. Drosophila species continually expanded into wetter or drier areas, higher or lower elevations, and regions of differing vegetation.
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From page 17... ...
Or a succession of single species can lead from an ancestral species to a single current species. Or an ancestral species can undergo repeated divi sions, producing complex networks of evolu- pat tionary relationships (Panel 2~.
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From page 19... ...
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