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Decadal trends in a coral community and evidence of changed disturbance regime

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dc.contributor Australian Institute Of Marine Science
dc.contributor Univ Tasmania
dc.contributor Sch Zool
dc.contributor University Of Tasmania
dc.contributor Australian Inst Marine Sci
dc.contributor Australian Institute Of Marine Science (aims) en JOHNSON, C. R. WAKEFORD, M. DONE, T. J. 2013-02-28T06:41:09Z 2017-03-21T00:46:51Z 2017-03-21T00:46:51Z 2019-10-21T21:38:37Z 2017-03-21T00:46:51Z 2013-02-28T06:41:09Z 2013-02-28T06:41:09Z 2019-10-21T21:38:37Z 2008-03-01
dc.identifier 7596 en
dc.identifier.citation Wakeford M, Done TJ and Johnson C (2008) Decadal trends in a coral community and evidence of changed disturbance regime. Coral Reefs. 27: 1-13. en
dc.identifier.issn 0722-4028
dc.description Link to abstract/full text - en
dc.description.abstract A 23 year data set (1981-2003 inclusive) and the spatially explicit individual-based model "Compete (c)" were used to investigate the implications of changing disturbance frequency on cover and taxonomic composition of a shallow coral community at Lizard Island, Australia. Near-vertical in situ stereo-photography was used to estimate rates of coral growth, mortality, recruitment and outcomes of pair-wise competitive interactions for 17 physiognomic groups of hard and soft corals. These data were used to parameterise the model, and to quantify impacts of three acute disturbance events that caused significant coral mortality: 1982-a combination of coral bleaching and Crown-of-Thorns starfish; 1990-cyclone waves; and 1996-Crown-of-Thorns starfish. Predicted coral community trajectories were not sensitive to the outcomes of competitive interactions (probably because average coral cover was only 32% and there was strong vertical separation among established corals) or to major changes in recruitment rates. The model trajectory of coral cover matched the observed trajectory accurately until the 1996 disturbance, but only if all coral mortality was confined to the 3 years of acute disturbance. Beyond that date (1997-2003), when the observed community failed to recover, it was necessary to introduce annual chronic background mortality to obtain a good match between modelled and observed coral cover. This qualitative switch in the model may reflect actual loss of resilience in the real community. Simulated over a century, an 8 year disturbance frequency most closely reproduced the mean community composition observed in the field prior to major disturbance events. Shorter intervals between disturbances led to reduced presence of the dominant hard coral groups, and a gradual increase in the slow growing, more resilient soft corals, while longer intervals (up to 16 years) resulted in monopolization by the fastest growing table coral, Acropora hyacinthus.
dc.description.uri en
dc.language English
dc.language en en
dc.relation.ispartof Coral Reefs - pages: 27: 1-13 en
dc.relation.ispartof Null
dc.relation.isreferencedby Link to Metadata Record - en
dc.relation.uri en
dc.subject Degradation
dc.subject Dynamics
dc.subject Community Structure
dc.subject Diversity
dc.subject Climate-change
dc.subject Chronic Disturbance
dc.subject Acanthaster-planci
dc.subject Patterns
dc.subject Resilience
dc.subject Marine & Freshwater Biology
dc.subject Predictions
dc.subject Climate Change
dc.subject Scleractinian Corals
dc.subject Phase-shifts
dc.subject Great-barrier-reef
dc.title Decadal trends in a coral community and evidence of changed disturbance regime
dc.type journal article en
dc.identifier.doi 10.1007/s00338-007-0284-0
dc.identifier.wos WOS:000252767200001

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