Mud creek banks, like this one at the Long Tabby site, are a concern for researchers at the University of Georgia Marine Extension Service and their partner on Sapelo Island, Ga. Over a hundred years ago the Sapelo estuary oyster reef where destroyed due to over harvesting. Oysters act as a natural barrier along thousands of miles of creeks in the estuary. Without that barrier, currents erode the banks more quickly. (Stephen Morton for The New York Times)
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