地理漫步·世界地理英语30篇（4）
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The Sunda Shelf: A Submerged Continental Platform Shaping Island Biogeography
巽他陆架：塑造岛屿生物地理格局的淹没大陆架
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The Sunda Shelf is a shallow continental platform submerged beneath the South China Sea and Java Sea.
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During Pleistocene glacial lows, sea levels dropped over 120 meters, exposing vast lowland plains.
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This land bridge connected modern islands like Sumatra, Java, and Borneo into a single Sundaland continent.
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Mammal species dispersed freely across this emergent terrain, explaining shared fauna across current islands.
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Post-glacial sea rise fragmented habitats, isolating populations and driving speciation in frogs and birds.
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Coral reefs now thrive along its drowned margins, forming biodiversity-rich marine ecotones.
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Sediment cores reveal mangrove expansion coinciding with Holocene sea-level stabilization.
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Current oil and gas exploration targets ancient river channels preserved beneath shelf sediments.
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Tidal resonance patterns differ markedly across its broad, gently sloping bathymetry.
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This shelf exemplifies how paleogeography constrains present-day ecological boundaries and resource distribution.