Writing in the journal Trends in Ecology and Evolution, eminent marine scientists from Australia and the USA have called for an international effort to improve the resilience of coral reefs, so they can withstand the impacts of climate change and other human activities.
“The world’s coral reefs are important economic, social and environmental assets, and they are in deep trouble. How much trouble, and why, are critical research questions that have obvious implications for formulating policy and improving the governance and management of these tropical maritime resources,” explains Jeremy Jackson from the Scripps Institution of Oceanography.
The key to saving the reefs lies in understanding why some reefs degenerate into a mass of weeds and never recover – an event known as a ‘phase shift’ – while on other reefs the corals manage to bounce back successfully, showing a quality known as resilience.
This underlines the importance of managing reefs in ways that promote their resilience, the researchers say.
They presented evidence that coral decline due to human activity has been going on for centuries, but has been particularly alarming in the past 50 years. In all some 125,000 square kilometres of the world’s corals have disappeared so far.
The most recent global report card (2008) estimated that 19% of all reefs were effectively lost, another 15% were critical and likely to be lost in 10–20 years, and a further 20% are under threat from local human pressures (already experiencing 20–50% loss of corals). The remaining 46% of reefs were at low risk from direct human impacts, but were nevertheless vulnerable to climate change and ocean acidification.
“We have a very good scientific understanding of what causes reefs to decline – what we now need is a clearer picture of how to help them back onto the reverse trajectory,” says lead author Professor Terry Hughes from the Australian Research Council Centre of Excellence for Coral Reef Studies at James Cook University.
Taking an optimistic view, the researchers argue there is compelling evidence from sites in Hawaii, Australia’s Great Barrier Reef, the Caribbean, Bahamas and Philippines that the degradation and disappearance of corals can be arrested and reversed with the right management:In Hawaii, where ending sewage discharges allowed corals in Kanehoe Bay to recover
“The coral reef crisis is a crisis of governance,” says co-author Peter Mumby from the University of Queensland.
The team has formulated the scientific lessons from resilient reefs into a set of management advice which governments can adopt to give coral reefs a fighting chance:Empower and educate local people to look after their own reefs
On climate change they caution: “Without urgent action, unchecked global warming and ocean acidification promise to be the ultimate policy failures for coral reefs. Although it is possible to promote the recovery of reefs following bouts of bleaching via local actions such as improving water-quality and protecting herbivores, these interventions alone cannot climate-proof reefs.”
“The clear message from our research, and that of other marine scientists, is that the world’s coral reefs can still be saved… if we try harder,” Prof. Hughes says.
Their article “Rising to the challenge of sustaining coral reef resilience” by Terry P. Hughes, Nicholas A.J. Graham, Jeremy B.C. Jackson, Peter J. Mumby and Robert S. Steneck appears in the latest issue of Trends in Ecology and Evolution (TREE).
The future of Australia’s and the world’s coral reefs is the focus of a major scientific symposium in Canberra on October 7 and 8, at the Australian Academy of Science’s Shine Dome.
A public forum will be held at the National Museum of Australia tonight, October 7 from 6.30pm to 7.30 pm. Media are welcome at both events.
Terry Hughes | EurekAlert!
100 % Organic Farming in Bhutan – a Realistic Target?
15.06.2018 | Humboldt-Universität zu Berlin
What the size distribution of organisms tells us about the energetic efficiency of a lake
05.06.2018 | Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)
Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...
Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.
Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...
The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.
Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.
An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.
Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...
Light detection and control lies at the heart of many modern device applications, such as smartphone cameras. Using graphene as a light-sensitive material for...
13.06.2018 | Event News
08.06.2018 | Event News
05.06.2018 | Event News
19.06.2018 | Physics and Astronomy
19.06.2018 | Life Sciences
19.06.2018 | Physics and Astronomy