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SlideshowReport

Species richness decreases with distance from the source pool.

Description
(a) Map of Australia, New Guinea, and these Polynesian Islands: New Caledonia, Fiji Islands, Cook Islands, Marquesas Islands, Pitcairn, and Easter Island. (b) The numbers of bird species on islands with increasing distance from the source pool, New Guinea, expressed as the percentage of bird species on New Guinea.
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