期刊
MARINE POLLUTION BULLETIN
卷 125, 期 1-2, 页码 289-300出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2017.08.036
关键词
Sediment; Corals; Clearance rates; Smothering; Morphology; Water flow
资金
- Chevron Australia
- Woodside Energy Limited
- BHP Billiton
- Rio Tinto
- Australian Government's National Environmental Science Programme
The sediment rejection ability of 8 coral species of 5 families and 3 morphologies were assessed in a series of short term exposure tests over a sedimentation range of 0.5-40 mg cm(-2) d(-1) and one longer term exposure test of 235 mg cm(-2). Sediment accumulation rates on live corals and dead (enamel-covered) skeletons varied between morphologies, with branching species often more adept at self-cleaning. Flow rates (0-17 cm s(-1)) significantly affected sediment-shedding ability as did differences in particle sizes, with coarse silt rejected faster than fine silt, but only at very high (235 mg cm(-2)) deposition rates. Siliciclastic sediment was rejected faster than carbonate sediments and smothering for many days by mms of low organic content carbonate sediment resulted in bleaching, but no mortality. The findings are discussed with respect to turbidity generated in natural and dredging-related resuspension events and in the context for impact prediction for dredging projects.
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