Coral Ba/Ca records of sediment input to the fringing reef of the southshore of Moloka'i, Hawai'i over the last several decades

Marine Pollution Bulletin
By: , and 

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Abstract

The fringing reef of southern Moloka’i is perceived to be in decline because of land-based pollution. In the absence of historical records of sediment pollution, ratios of coral Ba/Ca were used to test the hypothesis that sedimentation has increased over time. Baseline Ba/Ca ratios co-vary with the abundance of red, terrigenous sediment visible in recent imagery. The highest values at One Ali’i are near one of the muddiest parts of the reef. This co-varies with the lowest growth rate of all the sites, perhaps because the upstream Kawela watershed was historically leveed all the way to the nearshore, providing a fast-path for sediment delivery. Sites adjacent to small, steep watersheds have ∼decadal periodicities whereas sites adjacent to mangrove forests have shorter-period fluctuations that correspond to the periodicity of sediment transport in the nearshore, rather than the watershed. All four sites show a statistically significant upward trend in Ba/Ca.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Coral Ba/Ca records of sediment input to the fringing reef of the southshore of Moloka'i, Hawai'i over the last several decades
Series title Marine Pollution Bulletin
DOI 10.1016/j.marpolbul.2010.05.024
Volume 60
Issue 10
Year Published 2010
Language English
Publisher Elsevier
Publisher location Amsterdam, Netherlands
Contributing office(s) Pacific Science Center
Description 14 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Marine Pollution Bulletin
First page 1822
Last page 1835
Country United States
State Hawai'i
City Moloka'i