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Reef erosion demonstrated by concrete and stainless-steel marker 

Detailed Description

Concrete and stainless-steel marker photographed 17 years after being installed into the reef in 1998 by Harold Hudson, NOAA. Scraping and grazing by parrotfish, chemical erosion from sponges, and wave action all combine to winnow away the dead skeletons of coral—a process known as reef erosion. This photograph was taken during USGS research in the Florida Keys National Marine Sanctuary at Hen and Chickens Reef Sanctuary Preservation Area under scientific collection permit number FKNMS-2013-024-A2. 

Sources/Usage

Public Domain.

This photograph was taken during USGS research in the Florida Keys National Marine Sanctuary at Hen and Chickens Reef Sanctuary Preservation Area under scientific collection permit number FKNMS-2013-024-A2. 

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