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Introduction  

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Similarly, Atlantic cordgrass (Spartina alterniflora) has invaded mudflats in Pacific coast estuaries, where it traps sediments leading to significant increases in elevation and in some sites placing the flats above normal tides or restricting tidal flows. Estuaries in the northern quarter of California and further north had no native Spartina species, but even in areas to the south which supported native Pacific cordgrass (Spartina foliosa) the invasive Atlantic cordgrass colonizes mudflats at lower elevations and with higher salinities. These mudflats were previously unvegetated but supported highly productive plankton and sediment fauna and served as rich feeding grounds for migratory shorebirds.
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Updated January 2005
©The Nature Conservancy, 2003