Abstract

A widely held view is that biotic resistance to invasion on oceanic islands is weak. On Christmas Island, Indian Ocean, the endemic red crab (Gecarcoidea natalis) and the introduced giant African snail (Achatina fulica) showed inverse patterns of abundance along gradients from disturbed habitat to intact rain forest: empty, but intact snail shells were abundant in disturbed habitat and rare in adjacent rain forest, while red crabs were abundant in rain forest and uncommon in disturbed habitat

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