Generally, the diversity of land animals and plants in Oceania is richest in the western Pacific, thinning out to the east where the islands are smaller and farther apart.

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The western Pacific islands, being closer to the Asian mainland, have a richer biodiversity due to easier dispersal of species. As one moves eastward, the islands become smaller and more isolated, leading to reduced species diversity.

Generally, the Diversity of Land Animals and Plants in Oceania