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Mar Pollut Bull. 2010 Oct;60(10):1822-35. doi: 10.1016/j.marpolbul.2010.05.024. Epub 2010 Jun 26.

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

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1
Pacific Science Center, U.S. Geological Survey, Santa Cruz, 400 Natural Bridges Drive, CA 95060, USA. nprouty@usgs.gov

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.

PMID:
20580381
DOI:
10.1016/j.marpolbul.2010.05.024
[Indexed for MEDLINE]

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