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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трип скан
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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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.
tripscan войти
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.
https://trip-scan.org
трип скан
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.”
KeithCor on
Sky-gazers may get a good chance to see fireballs streak across the night sky this week. Two meteor showers — the Alpha Capricornids and Southern Delta Aquariids — will reach their peak and another is ramping up.
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The Alpha Capricornids meteor shower, which is best known for producing very bright meteors called fireballs that may look like shooting stars, will be most visible at 1 a.m. ET Wednesday, according to Robert Lunsford, fireball report coordinator for the American Meteor Society. Its radiant — the point at which the meteor streaks seem to originate — is in the Capricorn constellation.
https://kra36.org
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The Alpha Capricornids are visible all over the world but are usually best seen from the Southern Hemisphere, in places such as Australia and Africa, according to Bill Cooke, the lead for NASA’s Meteoroid Environments Office. These meteors are expected to appear at a rate of three to five per hour. If you are viewing from the Northern Hemisphere, keep your eyes low along the southern sky to catch a glimpse.
If you stay up later, you’ll be able to see the Southern Delta Aquariids reach peak activity at 3 a.m. ET on Wednesday, said Lunsford. The Southern Delta Aquariids, which also are most visible in the Southern Hemisphere, make for a stronger shower than the Capricornids; people located in parts of the Northern Hemisphere such as the US can expect to view up to 10 to 15 meteors per hour, while those in the Southern Hemisphere may see 20 to 25 per hour.
The Aquariids appear to stream from the southern part of the Aquarius constellation, which is around 40 degrees east of the Capricorn constellation, according to Lunsford: “They’re going to kind of do a battle, shooting back and forth at each other.”
Both showers will be visible through August 13, though there is some disagreement about the date on which their peaks will occur. While experts at the American Meteor Society say peak activity will occur Tuesday night into early Wednesday morning, those at NASA say it will happen Wednesday night going into Thursday.
“The time of a meteor shower peak is not constant from year-to-year. It can vary by plus or minus a day or two,” Cooke said.
But missing the peak, according to Lunsford, is nothing to fret about. “It’s not a real sharp peak …You can go out (on) the 31st or the 29th and see pretty much the same activity.”
For the best viewing, avoid areas with bright lights and objects that could obscure your view of the sky, such as tall trees or buildings. Picking a spot with a higher altitude, like a mountain or hill, may make it easier to spot these showers.
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