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Alien Species Pose a Severe Threat to Hawaii
Pages 25-26

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From page 25...
... Land clearing, agriculture, and urbanization have transformed lowland ecosystems. Since The banana poke vine, introduced into Hawaii in the 1 920s as an ornamental plant, has spread throughout Hawaii's forests and fielos, where it overgrows and smothers native plants.
From page 26...
... Before humans began introducing non-native animals and plants in great numbers, fewer natural predators lived in Hawaii than on the mainland. As a result, many native species gradually lost preexisting defenses, such as thorns or toxins, because variants without the defenses might have enjoyed one or more adaptive advantages.

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