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Rapid external erosion of coral substrate in subtropical Hong Kong waters.
Rapid external erosion of coral substrate in subtropical Hong Kong waters.
- Source :
-
Marine pollution bulletin [Mar Pollut Bull] 2021 Aug; Vol. 169, pp. 112495. Date of Electronic Publication: 2021 May 27. - Publication Year :
- 2021
-
Abstract
- Erosion of coral substrate plays a crucial role in reef calcium carbonate budget, but little is known about erosion in subtropical corals. In a 2-year study of coral substrate erosion, we deployed Porites skeletal blocks at nine sites across subtropical Hong Kong waters. External erosion varied from 0.05 to 3.07 kg m <superscript>-2</superscript>  yr <superscript>-1</superscript> and accounted for 23.4-99.2% of the total erosion. More than half of the study sites had substantial external erosion (> 1 kg m <superscript>-2</superscript>  yr <superscript>-1</superscript> ), and the values were positively correlated with density of the sea urchin Diadema setosum. Excluding urchins from access to the skeletal blocks using cages reduced external erosion by more than 90%. Overall, our study revealed that external erosion caused by urchin grazing contributed predominantly to the total coral skeletal loss in Hong Kong waters. Control of sea urchin population is needed to reduce coral erosion in places with high urchin density. (149 words).<br /> (Copyright © 2021 Elsevier Ltd. All rights reserved.)
- Subjects :
- Animals
Calcium Carbonate
Coral Reefs
Hong Kong
Sea Urchins
Anthozoa
Subjects
Details
- Language :
- English
- ISSN :
- 1879-3363
- Volume :
- 169
- Database :
- MEDLINE
- Journal :
- Marine pollution bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 34052586
- Full Text :
- https://doi.org/10.1016/j.marpolbul.2021.112495