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Assessing loss of coral cover on Australia's Great Barrier Reef over two decades, with implications for longer-term trends

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dc.contributor Australian Institute Of Marine Science
dc.contributor Australian Inst Marine Sci
dc.contributor Australian Institute Of Marine Science (aims) en SYMS, C. SWEATMAN, H. DELEAN, S. 2017-03-21T00:52:59Z 2017-03-21T00:52:59Z 2013-02-28T06:44:45Z 2020-09-02T03:41:20Z 2013-02-28T06:44:45Z 2013-02-28T06:44:45Z 2017-03-21T00:52:59Z 2020-09-02T03:41:20Z 2011-06-01
dc.identifier 8456 en
dc.identifier.citation Sweatman HPA, Delean S and Syms C (2011) Assessing loss of coral cover on Australia s Great Barrier Reef over two decades with implications for longer-term trends. Coral Reefs. 30: 521-531. en
dc.identifier.issn 0722-4028
dc.description Link to abstract/full text - en
dc.description.abstract While coral reefs in many parts of the world are in decline as a direct consequence of human pressures, Australia's Great Barrier Reef (GBR) is unusual in that direct human pressures are low and the entire system of similar to 2,900 reefs has been managed as a marine park since the 1980s. In spite of these advantages, standard annual surveys of a large number of reefs showed that from 1986 to 2004, average live coral cover across the GBR declined from 28 to 22%. This overall decline was mainly due to large losses in six (21%) of 29 subregions. Declines in live coral cover on reefs in two inshore subregions coincided with thermal bleaching in 1998, while declines in four mid-self subregions were due to outbreaks of predatory starfish. Otherwise, living coral cover increased in one subregion (3%) and 22 subregions (76%) showed no substantial change. Reefs in the great majority of subregions showed cycles of decline and recovery over the survey period, but with little synchrony among subregions. Two previous studies examined long-term changes in live coral cover on GBR reefs using meta-analyses including historical data from before the mid-1980s. Both found greater rates of loss of coral and recorded a marked decrease in living coral cover on the GBR in 1986, coinciding exactly with the start of large-scale monitoring. We argue that much of the apparent long-term decrease results from combining data from selective, sparse, small-scale studies before 1986 with data from both small-scale studies and large-scale monitoring surveys after that date. The GBR has clearly been changed by human activities and live coral cover has declined overall, but losses of coral in the past 40-50 years have probably been overestimated.
dc.description.sponsorship The GBR data were collected meticulously by the numerous members of the AIMS Long-term Monitoring Program over the 19 years. We thank L. Castell, A. Cheal, M. Emslie, A. MacNeil, I. Miller K. Osborne and A. Thompson for comments on drafts the manuscript. The study was supported by AIMS, the CRC Reef Research Centre and the Australian Government's Marine and Tropical Sciences Research Facility.
dc.description.uri en
dc.language English
dc.language en en
dc.relation.ispartof Coral Reefs - pages: 30: 521-531 en
dc.relation.ispartof Null
dc.relation.uri en
dc.subject Phase-shifts
dc.subject Conservation
dc.subject Disturbance
dc.subject Climate-change
dc.subject Outbreaks
dc.subject Disturbance And Recovery
dc.subject Acanthaster-planci
dc.subject Assemblages
dc.subject Marine & Freshwater Biology
dc.subject Communities
dc.subject Long-term Monitoring
dc.subject Coral Cover
dc.subject Ecosystems
dc.subject Reproduction
dc.subject Acanthaster
dc.subject Great Barrier Reef
dc.title Assessing loss of coral cover on Australia's Great Barrier Reef over two decades, with implications for longer-term trends
dc.type journal article en
dc.identifier.doi 10.1007/s00338-010-0715-1
dc.identifier.wos WOS:000290327000030

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