Future too warm for baby sharks
New research has found as climate change causes the world’s oceans to warm, baby sharks are born smaller, exhausted, undernourished and into environments that are already difficult for them to survi
ARC Centre of Excellence for Coral Reef Studies
James Cook University Townsville
Queensland 4811 Australia
Phone: 61 7 4781 4000
Email: info@coralcoe.org.au
Next time you successfully fight off a nasty infection, give thanks to the Great Barrier Reef.
A dramatic discovery by an Australian team of scientists has revealed that the ability of humans to resist bacterial diseases may go as far back in our ancestry as corals.
Researchers at the ARC Centre of Excellence for Coral Reef Studies (CoECRS) have found three genes in Acropora (staghorn) corals which show a very fast, strong immune response to the presence of bacteria – and the same genes also occur in mammals, including people.
“It’s early days, but it certainly looks as if key aspects of our ability to resist bacteria are extremely ancient and may have been pioneered by the ancestor of corals – and then passed down to humans in our evolutionary lineage,” explains team leader Professor David Miller of CoECRS and James Cook University.
“Corals are constantly attacked by bacteria in their natural environment, and so have perfected very efficient defences against them,” he says. “These defences apparently work well enough to be preserved in mammals like us, and possibly in plants too. Certain animals in between us and coral, like roundworms and flies, seem to have lost these genes, but our line appears to have retained them.”
The genes belong to a family known as the GiMAPs and have been associated with anti-bacterial immunity in mammals, including humans.
The team made its discovery by challenging living colonies of Acropora with certain chemicals commonly found in the coats of bacteria, and studying which genes reacted across virtually its entire genome of 20,000-plus genes.
“We were quite surprised at how rapidly and strongly these three genes in particular reacted to the presence of bacterial proteins,” Prof. Miller says. “It was spectacular.”
The main goal of the research is to better understand the mechanisms by which corals resist attack by bacteria and viruses – an urgent task in view of a massive upsurge in coral diseases around the world, which researchers attribute to the impact of human activity on the oceans and on coral reefs themselves.
“By better understanding the basis of coral immunity we may first be able to understand what is causing this pandemic of coral diseases and how human activity is connected to it.
“And second, this may lead us to better ways of managing our reefs that reduce the impact of disease, and give corals a better chance of survival during a period of major climatic and environmental change,” he says.
Prof. Miller has also been involved with an international team in a second, equally important discovery – helping for the first time to clarify the molecular process by which corals form their calcium-rich skeletons.
“With the world’s oceans becoming more acidic due to man-made carbon dioxide emissions, the whole basis by which corals and other marine organisms form their skeletons and shells – known as calcification – is under threat.
“Many marine scientists fear that if the oceans become more acidic as we redouble fossil fuel use, many of these lifeforms will not be able to cope – and our coral reefs could literally dissolve before our very eyes,” he explains.
“Understanding how coral forms its skeleton at the molecular level is part of the basic science required to properly understand what is going on in the world’s coral reefs, and to predict the outcome with some certainty. At the moment, while we fear acidification will be damaging for corals, we don’t know how bad – whether it will affect all corals equally, whether it will inflict extensive damage, or will wipe them out completely.”
Prof Miller says that the most important implication of ongoing work which builds on the published study is that, while corals can to some extent cope with ocean acidification on its own, the combination of increasing temperature and acidity are much more damaging. “This is significant, because climate change will result in just those conditions that are most harmful to skeleton formation and maintenance,” he says.
“Corals have been around for a long time, and over hundreds of millions of years the coral lineage has survived previous periods of ocean acidification. However, modern coral reefs are fragile things, and reefs as we know them may not exist in the later part of this century if we do not deal immediately with global CO2 emissions”.
Details of the research appear in the following scientific papers:
Acute transcriptional response of the coral Acropora millepora to immune challenge: expression of GiMAP/IAN genes links the innate immune responses of corals with those of mammals and plants, by Yvonne Weiss, Sylvain Forêt, David C Hayward, Tracy Ainsworth, Rob King, Eldon E Ball and David J Miller, in BMC Genomics, June 2013. Citation: Weiss et al. BMC Genomics (2013) 14:400.
The skeletal proteome of the coral Acropora millepora: the evolution of calcification by cooption and domain shuffling, by Paula Ramos-Silva, Jaap Kaandorp, Lotte Huisman, Benjamin Marie, Isabelle Zanella-Cléon, Nathalie Guichard, David J. Miller and Frédéric Marin, in Molecular Biology and Evolution, June 2013.
More information:
Professor David Miller, CoECRS and JCU, +61 7 4781 4473 or 0419 671 768
Jenny Lappin, CoECRS, +61 7 4781 4222
Jim O’Brien, James Cook University Media Office, +61 7 4781 4822 or 0418 892449
https://www.coralcoe.org.au/
New research has found as climate change causes the world’s oceans to warm, baby sharks are born smaller, exhausted, undernourished and into environments that are already difficult for them to survi
A new study shows the coastal protection coral reefs currently provide will start eroding by the end of the century, as the world continues to warm and the oceans acidify. A team of researchers led
A team of scientists led by the ARC Centre of Excellence for Coral Reef Studies (Coral CoE) won one of the nation’s top science awards at tonight’s ‘Oscars of Australian science’, the Eureka P
An analytical tool will be used to assess the climate risks facing historic World Heritage sites in Africa—the ruins of two great 13th century ports and the remains of a palace and iron-making indus
Abstract: It is a little over a decade since research commenced into the effects of anthropogenic ocean acidification on marine fishes. In that time, we have learned that projected end-of-century
Abstract: Increased uptake of carbon dioxide from the atmosphere has caused the world’s ocean to become more acidic. Different marine habitats are known to have varying ranges of CO2 across mul
Abstract: The Allen Coral Atlas (http://allencoralatlas.org) partnership uses high-resolution satellite imagery, machine learning, and field data to map and monitor the world’s coral reefs at unp
Abstract: Climate change is causing the average surface temperature of the oceans to rise and increasing the frequency and intensity of marine heatwaves. In addition, absorption of additional CO2
Abstract: Marine environments are a concealing medium, where observations of natural fish behavior are challenging. In particular, the geographic and depth distributions of migratory top predators ar
Abstract: Invasive species management can be the the subject of debate in many countries due to conflicting ecological, ethical, economic, and social reasons, especially when dealing with a species s
Abstract: Ocean acidification, the increase in seawater CO2 with all its associated consequences, is relatively well understood in open oceans. In shelf seas such as the Great Barrier Reef, processe
Abstract: The backdrop of legends and movies, the deep sea has always been unfathomable because we had no idea what existed there. Once thought to be barren of life, we now know this couldn’t be
ARC Centre of Excellence for Coral Reef Studies
James Cook University Townsville
Queensland 4811 Australia
Phone: 61 7 4781 4000
Email: info@coralcoe.org.au