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bizarre pregnancy test link to amphibian extinctions

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bizarre pregnancy test link to amphibian extinctions

Unread postby yeahbut » Sun 13 Jul 2008, 04:40:32

Well it was pretty bizarre news to me anyway. Maybe everyone else is up to speed already on the 'Grandma needed to know if she was knocked up and now there ain't gonna be no frogs' theory...

$this->bbcode_second_pass_quote('', 'E')dinburgh, April 22 : Biologists have warned that the entire population of the world’s frogs and other amphibians could be wiped out like the dinosaurs by a deadly fungus within three decades.

According to a report in the Scotsman, a strain of the chytrid virus that kills frogs, toads, newts and other amphibians could spell the biggest mass extinction since the dinosaurs.

The chytrid fungus, Batrachochytrium dendrobatidis, infects all kinds of amphibians and causes the fatal disease chytridiomycosis.

Scientists first noticed the alarming number of amphibians under threat about 15 years ago. But it was not until the late 1990s that it was discovered the chytrid fungus was to blame.

It is believed the deadly fungus originated in South Africa, and spores were then spread by the commercial trade in African clawed frogs, which were used as an early pregnancy test.

Some notorious pest species, including the cane toad, American bullfrog and African clawed frog, have resistance and have been spreading it throughout the world.

“Frogs, toads, newts, salamanders and caecilians, which are limbless, almost eel-like amphibians, are all under threat,” said Iain Stephen of London Zoo. “The disease is very rapid. You can have a total die-off within weeks of its arrival,” he added.

According to Stephen, there are 6,000 species of amphibians in the world and over two-thirds of them are in decline, which is a higher percentage than any other animal group.

“It’s the biggest decline taking place on the planet. Over the next 20 or 30 years, we could be talking about the biggest mass extinction since the dinosaurs,” he said.

In the past few years, more than 100 species of frogs have become extinct.


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$this->bbcode_second_pass_quote('', 'I')n the 1930s and 40s, live female Xenopus frogs were used widely in Europe, Australasia and north America in pregnancy testing.


A sample of the woman's urine was injected under the frog's skin; if the woman was pregnant, a hormone in her urine caused the frog to ovulate.

Alternative tests involved male frogs and toads, which produced sperm in response to the human hormone gonadotrophin.

Thousands of Xenopus were exported from Africa each year, potentially carrying Batrachochytrium with them, and - perhaps through occasional escapes - delivering it to the habitats of other continents, where it could inflict major damage on amphibian species that were more vulnerable.


It's hard to imagine a weirder, or more vivid, example of unintended consequences of human activity...

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Re: bizarre pregnancy test link to amphibian extinctions

Unread postby Mominator » Mon 14 Jul 2008, 20:09:54

I hadn't heard of it being done with frogs! That is interesting. They used to commonly use rabbits the same way. (that's where the phrase "the rabbit died" meaning "she's pregnant" came from--only that wasn't quite right because the rabbit was killed every time)

Thanks for posting this.
~Laura

"If you weren't smart enough to plan ahead then Doom on you!" ~Dodo bird
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Re: bizarre pregnancy test link to amphibian extinctions

Unread postby yeahbut » Tue 15 Jul 2008, 16:15:22

$this->bbcode_second_pass_quote('Mominator', 'I') hadn't heard of it being done with frogs! That is interesting. They used to commonly use rabbits the same way. (that's where the phrase "the rabbit died" meaning "she's pregnant" came from--only that wasn't quite right because the rabbit was killed every time)

Thanks for posting this.


Cheers Laura. "The rabbit died", huh? I guess that one never made it to NZ, or passed me by anyways. What a great phrase...

It seems to me that this example of human-wrought devastation is a classic illustration of at least a couple of things; 1) the unintended and unforseeable possible consequences of our actions as a fast moving, global species, and
2) the point that with a strained, polluted, over-drawn environment, there's no telling where the breaking point will appear. This is an entire class of animals we're talking about here, starting to disappear in what some are calling potentially the largest extinction wave since the K-T. It could just as easily have been a class of animals or plants that we depend on directly or indirectly to survive(food species, pollinators etc). Next time it might be.

btw Mominator, dunno why but I alway hear your handle in my head with a weird Austrian/Californian accent...now why is that? :-D
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