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Toxic algae are turning South Australia’s coral reefs into underwater graveyards – and there’s no end in sight

Anthonysaw (05.08.2025 06:49:25)
What struck Scott Bennett most were the razor clams.

The long saltwater clams, resembling old-fashioned razors, normally burrow into sand to avoid predators. But when Bennett, an ecologist, visited South Australia’s Great Southern Reef last month, he saw thousands of them rotting on the sea floor.
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“100% of them were dead and wasting away on the bottom,” Bennett told CNN.

Since March, a harmful algal bloom, fueled by a marine heat wave, has been choking South Australia’s coastline, turning once-colorful ecosystems filled with thriving marine life into underwater graveyards.

The bloom has killed about 15,000 animals from over 450 species, according to observations on the citizen science site iNaturalist. They include longfinned worm eels, surf crabs, warty prowfish, leafy seadragons, hairy mussels and common bottlenose dolphins.
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The algae have poisoned more than 4,500 square kilometers (1,737 square miles) of the state’s waters – an area larger than Rhode Island – littering beaches with carcasses and ravaging an area known for its diversity.

It’s “one of the worst marine disasters in living memory,” according to a report by the Biodiversity Council, an independent expert group founded by 11 Australian universities.

The toxic algal bloom has devastated South Australia’s fishing industry and repelled beachgoers, serving as a stark warning of what happens when climate change goes unchecked.

Once a bloom begins, there is no way of stopping it.

“This shouldn’t be treated as an isolated event,” Bennett said. “This is symptomatic of climate driven impacts that we’re seeing across Australia due to climate change.”

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A mysterious yellow foam

Richardwah (05.08.2025 05:45:04)
It all started back in March, when dozens of surfers at beaches outside Gulf St Vincent, about an hour south of state capital Adelaide, reported experiencing a sore throat, dry cough and blurred vision after emerging from the sea.
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Shortly after, a mysterious yellow foam appeared in the surf. Then, dead marine animals started washing up.

Scientists at the University of Technology Sydney soon confirmed the culprit: a buildup of a tiny planktonic algae called Karenia mikimotoi. And it was spreading.
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In early May, the government of Kangaroo Island, a popular eco-tourism destination, said the algal bloom had reached its coastline. A storm at the end of May pushed the algae down the coast into the Coorong lagoon. By July, it had reached the beaches of Adelaide.

Diverse algae are essential to healthy marine ecosystems, converting carbon dioxide into oxygen and benefiting organisms all the way up the food chain, from sea sponges and crabs to whales.

But too much of one specific type of algae can be toxic, causing a harmful algal bloom, also sometimes known as a red tide.

While Karenia mikimotoi does not cause long-term harm to humans, it can damage the gills of fish and shellfish, preventing them from breathing. Algal blooms can also cause discoloration in the water and block sunlight from coming in, harming ecosystems.

The Great Southern Reef is a haven for “really unique” biodiversity, said Bennett, a researcher at the University of Tasmania, who coined the name for the interconnected reef system which spans Australia’s south coast.

About 70% of the species that live there are endemic to the area, he said, meaning they are found nowhere else in the world.

“For these species, once they’re gone, they’re gone.”

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3 missing, house swept away as flash flooding hits New Mexico mountain village

Robertdut (04.08.2025 20:09:52)
Santa Fe, New Mexico
AP — At least three people were missing in a mountain village in southern New Mexico that is a popular summer retreat after monsoon rains triggered flash flooding Tuesday that was so intense an entire house was swept downstream.
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Emergency crews carried out at least 85 swift water rescues in the Ruidoso area, including of people who were trapped in their homes and cars, said Danielle Silva of the New Mexico Department of Homeland Security and Emergency Management.

No deaths were immediately reported, but Silva said the extent of the destruction wouldn’t be known until the water recedes.
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“We knew that we were going to have floods … and this one hit us harder than what we were expecting,” Ruidoso Mayor Lynn D. Crawford said during a radio address Tuesday night.

Crawford said that some people were taken to the hospital, although the exact number was not immediately clear. He encouraged residents to call an emergency line if their loved ones or neighbors were missing.
The floods came just days after flash floods in Texas killed over 100 people and left more than 160 people missing.

In New Mexico, officials urged residents to seek higher ground Tuesday afternoon as the waters of the Rio Ruidoso rose nearly 19 feet in a matter of minutes amid heavy rainfall. The National Weather Service issued flood warnings in the area, which was stripped of vegetation by recent wildfires.

A weather service flood gauge and companion video camera showed churning waters of the Rio Ruidoso surge over the river’s banks into surrounding forest. Streets and bridges were closed in response.

Kaitlyn Carpenter, an artist in Ruidoso, was riding her motorcycle through town Tuesday afternoon when the storm started to pick up, and she sought shelter at the riverside Downshift Brewing Company with about 50 other people. She started to film debris rushing down the Rio Ruidoso when she spotted a house float by with a familiar turquoise door. It belonged to the family of one of her best friends.

Her friend’s family was not in the house and is safe, she said.

“I’ve been in that house and have memories in that house, so seeing it come down the river was just pretty heartbreaking,” Carpenter said. “I just couldn’t believe it.”

There were also reports of dead horses near the town’s horse racing track, the mayor said.

Two National Guard rescue teams and several local teams already were in the area when the flooding began, Silva said, and more Guard teams were expected.

The area has been especially vulnerable to flooding since the summer of 2024, when the South Fork and Salt fires raced across tinder-dry forest and destroyed an estimated 1,400 homes and structures. Residents were forced to flee a wall of flames, only to grapple with intense flooding later that summer.

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3 missing, house swept away as flash flooding hits New Mexico mountain village

Rafaelpog (04.08.2025 18:15:18)
Santa Fe, New Mexico
AP — At least three people were missing in a mountain village in southern New Mexico that is a popular summer retreat after monsoon rains triggered flash flooding Tuesday that was so intense an entire house was swept downstream.
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Emergency crews carried out at least 85 swift water rescues in the Ruidoso area, including of people who were trapped in their homes and cars, said Danielle Silva of the New Mexico Department of Homeland Security and Emergency Management.

No deaths were immediately reported, but Silva said the extent of the destruction wouldn’t be known until the water recedes.
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“We knew that we were going to have floods … and this one hit us harder than what we were expecting,” Ruidoso Mayor Lynn D. Crawford said during a radio address Tuesday night.

Crawford said that some people were taken to the hospital, although the exact number was not immediately clear. He encouraged residents to call an emergency line if their loved ones or neighbors were missing.
The floods came just days after flash floods in Texas killed over 100 people and left more than 160 people missing.

In New Mexico, officials urged residents to seek higher ground Tuesday afternoon as the waters of the Rio Ruidoso rose nearly 19 feet in a matter of minutes amid heavy rainfall. The National Weather Service issued flood warnings in the area, which was stripped of vegetation by recent wildfires.

A weather service flood gauge and companion video camera showed churning waters of the Rio Ruidoso surge over the river’s banks into surrounding forest. Streets and bridges were closed in response.

Kaitlyn Carpenter, an artist in Ruidoso, was riding her motorcycle through town Tuesday afternoon when the storm started to pick up, and she sought shelter at the riverside Downshift Brewing Company with about 50 other people. She started to film debris rushing down the Rio Ruidoso when she spotted a house float by with a familiar turquoise door. It belonged to the family of one of her best friends.

Her friend’s family was not in the house and is safe, she said.

“I’ve been in that house and have memories in that house, so seeing it come down the river was just pretty heartbreaking,” Carpenter said. “I just couldn’t believe it.”

There were also reports of dead horses near the town’s horse racing track, the mayor said.

Two National Guard rescue teams and several local teams already were in the area when the flooding began, Silva said, and more Guard teams were expected.

The area has been especially vulnerable to flooding since the summer of 2024, when the South Fork and Salt fires raced across tinder-dry forest and destroyed an estimated 1,400 homes and structures. Residents were forced to flee a wall of flames, only to grapple with intense flooding later that summer.

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