‘Dead Corals Don’t Make Babies’: New Great Barrier Reef Coral Growth Declined 89% After Back-to-Back Bleaching Events
A study published in Nature Wednesday found that the death of corals in 2016 and 2017 has significantly decreased the ability of new corals to grow and thrive. In 2018, there has been an 89 percent decline in the number of new corals on the reef compared to the historic record.
"Dead corals don't make babies," lead author and James Cook University professor Terry Hughes said, as BBC News reported.
Global warming disrupts recovery of coral reefs. New research by @ProfTerryHughes @James_T_Kerry @ConnollySeanR… https://t.co/jZp9JBiCqo— CoralCoE (@CoralCoE)1554310873.0
The researchers, from the ARC Center of Excellence for Coral Reef Studies in Australia, were surprised by the extent of the decline in new corals. It was the first time they had observed such a decline on the reef.
"We thought the Barrier Reef was too big to fail," ARC chief investigator Andrew Baird told The New York Times, "but it's not."
Baird added that the study was the first to document the collapse of the processes of an ocean ecosystem.
Bleaching occurs when warm water forces corals to expel the algae that gives them color and nutrients. Reefs can recover from such events, but it takes about a decade. The Great Barrier Reef has suffered four since 1998 and, if greenhouse gas emissions continue at current levels, there could be two bleaching events every decade beginning in 2035.
The extent of the most recent bleaching events — covering 900 miles of reef — also made it harder for baby corals to replenish impacted coral populations, BBC News explained.
"Babies can travel over vast distances, and if one reef is knocked out, there are usually plenty of adults in another reef to provide juveniles," Baird told BBC News. "Now, the scale of mortality is such that there's nothing left to replenish the reef."
The bleaching impacted some corals more than others. New Acropora corals decreased by 93 percent. These are table-shaped corals that are responsible for the three-dimensional structure of the reef and provide habitat for species like coral trout and clown fish.
"We've always anticipated that climate change would shift the mix of coral," Hughes told National Geographic. "What's surprised us is how quickly that is now happening. It's not happening in the future. It's something that we're now measuring."
Another paper I hoped I would never have to write: Global warming impairs stock–recruitment dynamics of corals | Na… https://t.co/EnhlRckYyd— Terry Hughes (@Terry Hughes)1554324171.0
A 2018 study had provided some hope by finding that corals that survived the 2016 bleaching event were also better able to withstand the event in 2017. Researchers are trying to breed the more resilient corals, but National Oceanic and Atmospheric Administration's Coral Reef Watch coordinator Mark Eakin, who was not involved in the study, told The New York Times that projects like this could not replenish the whole reef.
"Those are at the scale of a large family garden," he said, while the threat to the Great Barrier Reef could cause "the loss of an entire seascape."
Baird seemed to agree.
"We've gotten to the point now where local solutions for the reef are almost pointless―the only thing that matters is action on climate change," Baird told BBC News.
Coral bleaching at Heron Island on the Great Barrier Reef in January 2016.
The Ocean Agency / XL Catlin Seaview Survey / Richard Vevers
NOAA Forecast: Great Barrier Reef Could Face Third Mass Bleaching Event in 4 Years @abc @noaa #CoralReefs… https://t.co/r8hgcGRvti— EcoWatch (@EcoWatch)1541574131.0
EcoWatch Daily Newsletter
The 2020 hurricane season is now expected to be the most active since at least the early 1980s, meteorologists at Colorado State University, a standard bearer for seasonal hurricane predictions, announced Wednesday.
Three years ago, scientists predicted it would happen. Now, new NASA satellite imagery confirms it's true: two ice caps in Canada's Nunavut province have disappeared completely, providing more visual evidence of the rapid warming happening near the poles, as CTV News in Canada reported.
- Climate Explained: What the World Was Like the Last Time Carbon ... ›
- Polar Bears Could Be Nearly Gone by 2100, Study Finds - EcoWatch ›
- Greenland's Ice Sheet Is Melting at Rate That Surpasses Scientists ... ›
By Katell Ané
The European Commission launched a new Farm to Fork strategy in an effort to reduce the social and environmental impact of the European food system. It is the newest strategy under the European Green Deal, setting sustainability targets for farmers, consumers, and policymakers.
Facebook and Twitter removed posts by President Donald Trump and his campaign Wednesday for violating their policies against spreading false information about COVID-19.
- Rare Inflammatory Disease Linked to More Than 100 Childhood ... ›
- COVID-19: What Experts Think About Reopening Schools - EcoWatch ›
- Teens and Tweens Are Fastest COVID-19 Spreaders, New Study ... ›
- Researchers Are Creating a Drone to Study Wild Dolphins With Help ... ›
- These Whales Are Suffering a Slow-Motion Extinction - EcoWatch ›
By Alexander Freund
Lebanese Prime Minister Hassan Diab says he believes Tuesday's explosion in Beirut could have been caused by large quantities of ammonium nitrate stored in the port.
What Is Ammonium Nitrate?<p>Ammonium nitrate is a white crystalline salt that can be fairly cheaply produced from ammonia and nitric acid. It is soluble and often used as fertilizer, as nitrogen is needed for healthy plant development.</p><p>Ammonium nitrate in its pure form is not dangerous. It is, however, heat sensitive. At 32.2 degrees Celsius (89.96 degrees Fahrenheit), ammonium nitrate changes its atomic structure, which in turn changes its chemical properties.</p><p>When large quantities of ammonium nitrate are stored in one place, heat is generated. If the amount is sufficiently vast, it can cause the chemical to ignite. Once a temperature of 170 C is reached, ammonium nitrate starts breaking down, emitting nitrous oxide, better known as laughing gas. Any sudden ignition causes ammonium nitrate to decompose directly into water, nitrogen and oxygen, which explains the enormous explosive power of the salt.</p>
Deadly Disasters<p>As ammonium nitrate is a highly explosive chemical, many countries strictly regulate its use. Over the past 100 years, there have been several disasters involving the chemical.</p><p>In 1921, for example, a massive blast occurred at a BASF chemical plant in Ludwigshafen in the German state of Rhineland-Palatinate. About 400 metric tons of a mixture of ammonium sulfate and ammonium nitrate exploded, killing 559 people and injuring 1,977. The plant was largely destroyed in the blast, which could be heard as far away as Munich, some 300 kilometers (186 miles) distant.</p><p>In 2015, explosions caused by ammonium nitrate ripped through the <a href="https://www.dw.com/en/china-convicts-dozens-for-last-years-giant-explosions-in-tianjin/a-36324321" target="_blank">Chinese port city of Tianjin</a>. Eight hundred metric tons of the chemical were said to have been stored along with other substances in a warehouse for hazardous materials. The blasts killed 173 people and destroyed an entire city district.</p><p>Two years earlier, in 2013, an ammonium nitrate explosion occurred at the West Fertilizer Company site in Texas, killing 14 people. And in 2001, 31 people died in Toulouse, France, in an explosion caused by the chemical.</p>
Terrorist Favorite<p>In Germany, the purchase and use of ammonium nitrate is regulated by the explosives act. This is because the cheap, highly explosive and relatively easily obtainable material has in the past been used by terrorists to carry out attacks.</p><p>For example, in 1995, U.S. conspiracy theorist and gun enthusiast Timothy McVeigh used a mixture of ammonium nitrate and other substances to bomb the Alfred P. Murrah Federal Building in Oklahoma City. Norwegian far-right extremist Anders Behring Breivik also used ammonium nitrate in a car bomb attack in Oslo in 2011.</p>
- 5 Ways to Keep Unhealthy Nitrates and Nitrites Out of Your Body ... ›
- The Price of Our Fertilizer Addiction - EcoWatch ›
- 8 Disturbing Facts About Monsanto's Evil Twin—The Chemical ... ›
By Michelle D. Holmes
Most Americans know about the Dietary Guidelines for Americans primarily through their colorful representations: the original food pyramid, which a few years ago morphed into MyPlate. The guidelines represent the government mothering us to choose the healthiest vegetables, grains, sources of protein, and desserts, and to eat them in the healthiest portions.
As innocuous as the food pyramid and MyPlate seem, they are actually a matter of life and death.
- 6 Powerful Ways to Improve Mental Health - EcoWatch ›
- New, Improved Vegetarian and Vegan Food Pyramid - EcoWatch ›
- Dr. Mark Hyman: Here's How the Food Pyramid Should Look ... ›