A reef in two gears: New patterns of coral recovery discovered

Date:
November 1, 2021
Source:
Queensland University of Technology
Summary:
Combining an innovative approach developed for medical sciences
mathematicians and marine ecologists have identified new coral
recovery patterns in the Great Barrier Reef, providing critical
information for the management of the reef.



FULL STORY ========================================================================== Damaged coral reefs show slower than expected recovery for up to six years before switching to a faster phase of regrowth, according to new research.


==========================================================================
This 'two-phase' recovery pattern was observed in 60 per cent of severely disturbed reefs on the Great Barrier Reef.

The modelling research, involving scientists from QUT and the Australian Institute of Marine Sciences (AIMS), pinpoints patterns of reef recovery
amid disturbances including storms, marine heatwaves, and crown-of-thorns starfish.

The researchers mapped the presence of the 'two-phase pattern' in reef
recovery based on AIMS long term monitoring data by modifying data
analysis methods used in cancer cell biology.

The findings have been published in the Journal of Applied Ecology.

Lead researcher, Dr David Warne, from QUT's Centre for Data Science,
said it was a "serendipitous moment in science" that brought together
the team involving mathematicians, statisticians, and marine ecologists.



==========================================================================
Dr Warne said the connection between reef research and cancer research
stemmed from a seminar at the ARC Centre of Excellence for Mathematical
and Statistical Frontiers (ACEMS) with AIMS senior scientist, Dr Juan
Ortiz, providing insights into growth patterns of TabularAcropora.

"The actual growth dynamics of individual coral colonies is vastly
different to cancer cells, but the net population level behaviour can
be remarkably similar," Dr Warne said.

Dr Warne said the results of the research provided critical information
for the management of the GBR as it identified reefs in need of help,
in the same way doctors triage patients to prioritise treatment.

"There was a working assumption that main driver of reef recovery was competition for space, but these results suggest that corals colonies
may be growing at lower rates for three-to-four years after major disturbances," he said.

The researchers also found the two-phase recovery pattern was present
in 50-60 per cent of the monitored sites that had experienced at least
one major disturbance over the past 30 years.



==========================================================================
Dr Ortiz said the research provided detailed insights into the coral
growth currently being observed in the field on the Great Barrier Reef.

"It's like starting your car in the wrong gear, you move really slowly
until the engine catches up and then you move normally," Dr Ortiz said.

"Since 2009, the GBR has been hit hard with mass bleaching events,
cyclones, and crown-of-thorns starfish outbreaks, reducing coral cover.

"After a window of reprieve from disturbances, AIMS' Long-Term Monitoring
team has recently observed strong increases in coral cover.

"We can see those reefs which have experienced rapid increases are
now in the second, faster recovery phase." Dr Warne said the research emphasised the importance of future studies to understand mechanisms
driving the two-phase patterns of coral growth.

The research team involved AIMS' Dr Ortiz, Kerryn Crossman, Kate Osbourne
and Angus Thompson, Wang Jin from the University of NSW as well as QUT's
Dr Warne, Distinguished Professor Kerrie Mengersen, Professor Matthew
Simpson, and Dr Paul Wu who are also members of ACEMS.

========================================================================== Story Source: Materials provided by
Queensland_University_of_Technology. Note: Content may be edited for
style and length.


========================================================================== Journal Reference:
1. David J. Warne, Kerryn A. Crossman, Wang Jin, Kerrie Mengersen, Kate
Osborne, Matthew J. Simpson, Angus A. Thompson, Paul Wu,
Juan‐C.

Ortiz. Identification of two‐phase recovery for interpretation
of coral reef monitoring data. Journal of Applied Ecology, 2021;
DOI: 10.1111/1365-2664.14039 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2021/11/211101105415.htm

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