Tectonic subsidence provides insight into possible coral reef futures under rapid sea-level rise

Saunders, Megan I., Albert, Simon, Roelfsema, Chris M., Leon, Javier X., Woodroffe, Colin D., Phinn, Stuart R. and Mumby, Peter J. (2015) Tectonic subsidence provides insight into possible coral reef futures under rapid sea-level rise. Coral Reefs, 35 1: 155-167. doi:10.1007/s00338-015-1365-0

Author Saunders, Megan I.
Albert, Simon
Roelfsema, Chris M.
Leon, Javier X.
Woodroffe, Colin D.
Phinn, Stuart R.
Mumby, Peter J.
Title Tectonic subsidence provides insight into possible coral reef futures under rapid sea-level rise
Journal name Coral Reefs   Check publisher's open access policy
ISSN 0722-4028
Publication date 2015-10-16
Sub-type Article (original research)
DOI 10.1007/s00338-015-1365-0
Open Access Status Not Open Access
Volume 35
Issue 1
Start page 155
End page 167
Total pages 13
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2016
Language eng
Formatted abstract
Sea-level rise will change environmental conditions on coral reef flats, which comprise extensive habitats in shallow tropical seas and support a wealth of ecosystem services. Rapid relative sea-level rise of 0.6 m over a relatively pristine coral reef in Solomon Islands, caused by a subduction earthquake in April 2007, generated a unique opportunity to examine in situ coral reef response to relative sea-level rise of the magnitude (but not the rate) anticipated by 2100. Extent of live coral was measured from satellite imagery in 2003, 2006, 2009 and 2012. Ecological data were obtained from microatolls and ecological surveys in May 2013. The reef was sampled at 12 locations where dense live hard coral remained absent, remained present or changed from absent to present following subsidence. Ecological data (substratum depth, live coral canopy depth, coral canopy height, substratum suitability, recruitment, diversity and Acropora presence) were measured at each location to identify factors associated with coral response to relative sea-level rise. Vertical and horizontal proliferation of coral occurred following subsidence. Lateral expansion of live coral, accomplished primarily by branching Acropora spp., resulted in lower diversity in regions which changed composition from pavement to dense live coral following subsidence. Of the ecological factors measured, biotic factors were more influential than abiotic factors; species identity was the most important factor in determining which regions of the reef responded to rapid sea-level rise. On relatively pristine reef flats under present climatic conditions, rapid relative sea-level rise generated an opportunity for hard coral to proliferate. However, the species assemblage of the existing reef was important in determining response to sea-level change, by providing previously bare substrate with a source of new coral colonies. Degraded reefs with altered species composition and slower coral growth rates may be less able to respond to climate change-induced sea-level changes.
Keyword Coral reef flat
Sea-level rise
Species diversity
Species identity
Subduction earthquake
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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