Walsh J.P.

A record of recent change in terrestrial sedimentation in a coral-reef environment, La Parguera, Puerto Rico: A response to coastal development?

Ryan, K. E., J. P. Walsh, D. R. Corbett, and A. Winter. 2008. A record of recent change in terrestrial sedimentation in a coral-reef environment, la parguera, puerto rico: A response to coastal development? Marine Pollution Bulletin 56 (6) (JUN): 1177-83.

Abstract: 
Increased sediment flux to the coastal ocean due to coastal development is considered a major threat to the viability of coral reefs. A change in the nature of sediment supply and storage has been identified in a variety of coastal settings, particularly in response to European colonization, but sedimentation around reefs has received less attention. This research examines the sedimentary record adjacent to a coastal village that has experienced considerable land-use change over the last few decades. Sediment cores were analyzed to characterize composition and sediment accumulation rates. Sedimentation rates decreased seaward across the shelf from 0.85 cm y1 in a nearshore bay to 0.19 cm y1 in a fore-reef setting. Data reflected a significant (up to 2) increase over the last 80 years in terrestrial sediment accumulating in the back-reef setting, suggesting greater terrestrial sediment flux to the area. Reef health has declined, and increased turbidity is believed to be an important impact, particularly when combined with additional stressors.
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