Climate: Heat-adapted corals not immune to bleaching

Intertidal Acropora corals exposed to air at low tide.

Intertidal Acropora corals exposed to air at low tide. Photo courtesy Dr. Verena Schoepf.

A matter of degrees …

Staff Report

Even corals living in some of the warmest ocean waters on the planet are susceptible to bleaching and heat stress, according to Australian researchers who studied unique tidal species in the Kimberley region.

When the water gets too warm, it breaks down the symbiosis between coral and their zooxanthellae (the microscopic plants which gives coral most of its colour), which can be fatal for the coral.

In the new study by scientists at the ARC Centre of Excellence for Coral Reef Studies said they were surprised to find that corals around the Kimberley region in north Western Australia are just as sensitive to heat stress and bleaching as their counterparts from less extreme environments elsewhere. Continue reading

NOAA says coral reefs worldwide hit by bleaching

Extensive stand of severely bleached coral at Lisianski Island in the Papahanaumokuakea Marine National Monument in Hawaii, documented during an August 2014 NOAA research mission. (Credit: NOAA).

Extensive stand of severely bleached coral at Lisianski Island in the Papahanaumokuakea Marine National Monument in Hawaii, documented during an August 2014 NOAA research mission. (Credit: NOAA).

Up to 95 percent of U.S. coral reefs may be affected

Staff Report

Global warming is causing global coral bleaching, ocean scientists said today, confirming that rising ocean temperatures are resulting in massive and widespread impacts to reefs around the world.

“The coral bleaching and disease, brought on by climate change and coupled with events like the current El Niño, are the largest and most pervasive threats to coral reefs around the world,” NOAA’s Coral Reef Watch coordinator, Mark Eakin, said in a statement. Continue reading

Groups say Florida port expansion plan is flawed

Letter to Corps of Engineers details serious problems

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Citizen groups and environmental activists say a plan to expand Port Everglades, in Fort Lauderdale, will harm unique coral reef ecosystems. Photo courtesy NASA Earth Observatory.

Staff Report

FRISCO — Community and environmental activists in Florida say a U.S. Army Corps of Engineers plan for expanding Port Everglades is flawed, especially considering the damage caused to reefs near Miami during the expansion of that port.

More than a dozen South Florida businesses and environmental organizations joined Miami Waterkeeper and the Center for Biological Diversity last week to demand that the Corps reevaluate its Port Everglades expansion plan. Continue reading

Protecting fish populations seen as key to coral reef conservation

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Coral reefs need abundant and diverse fish populations to survive. Photo via NOAA.

Fishing regulations around coral reef hotspots must be enforced

Staff Report

FRISCO — Protecting fish populations around coral reefs may be the key to helping sustain coral ecosystems, according to a new study by the Wildlife Conservation Society that has major implications for coral reef management.

The study focused on coral reef diversity ‘hotspots’ in the southwestern Indian Ocean, finding that they rely more on the biomass of fish than where they are located. Continue reading

Global warming: Outlook for coral reefs gloomy, scientists say at Prague conference

‘We will have algal-dominated, rubble-strewn, slowly eroding limestone benches’

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Limiting global warming to 2 degrees Celsius may not be enough to save ocean ecosystems, according to scientists.

Staff Report

FRISCO — Even if this year’s COP21 talks in Paris result in a global climate treaty, it may not be enough to save the world’s coral reefs. A global temperature increase of 2 degrees Celsius — targeted by the talks — means most reefs could be dead by mid-century, according to presentations at the Goldschmidt conference in Prague.

Speaking to the world’s major gathering of geochemists, Professor Peter F Sale (University of Windsor, Canada) spelled out the stark choice facing climate scientists in the run-up to the Paris conference.

“Even if Paris is wildly successful, and a treaty is struck, ocean warming and ocean acidification are going to continue beyond the end of this century,” Sale said.

“I find it very unlikely that coral reefs as I knew them in the mid-1960s will still be found anywhere on this planet by mid-century. Instead, we will have algal-dominated, rubble-strewn, slowly eroding limestone benches,” Sale said. Continue reading

Loss of coral reefs could make some islands uninhabitable

The residents of

Some reef-ringed atolls will see their drinking water supplies wiped out due to global warming.

Island flooding likely to increase dramatically as coral reefs die

Staff Report

FRISCO —Besides losing critical marine nurseries, the decline of coral reefs will put some island communities at direct risk of flooding and even threaten freshwater drinking supplies, according to a new study that tries to project how climate change will affect the ability of coral reefs to mitigate coastal hazards.

About 30 million people living on low-lying coral islands and atolls are dependent on ecosystem services provided by reefs. Right now, some of those islands see flooding from large waves a few times each decade, but that number is expected to increase dramatically. Continue reading

Climate: Coral reefs taking a big hit this year

A diverse coral reef in the U.S. Virgin Islands. PHOTO BY CAROLINE ROGERS/USGS.

Coral reefs in the Caribbean, like this one in the U.S. Virgin Islands, are at risk of bleaching as global warming heats up the world’s oceans. Photo by Caroline Rogers/USGS.

Warm oceans leading to widespread reef bleaching

Staff Report

FRISCO — Ocean researchers have updated their warnings of potential coral reef bleaching based on unusually warm ocean temperatures across the north Pacific, equatorial Pacific, and western Atlantic oceans this summer.

Scientists with NOAA’s coral reef watch say they expect  bleaching of corals on Northern Hemisphere reefs through October, potentially leading to the death of corals over a wide area and affecting the long-term supply of fish and shellfish.

“The bleaching that started in June 2014 has been really bad for corals in the western Pacific,” said Mark Eakin, NOAA Coral Reef Watch coordinator. “We are worried that bleaching will spread to the western Atlantic and again into Hawaii.” Continue reading

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