How a pregnancy test for humans caused a wave of global extinctions
By Joseph Bennington-Castro | io9.com
The deadly fungus Batrachochytrium dendrobatidis has been wiping out amphibian species across the globe for decades. But how did this global environmental disaster get started? A new study suggests that it came from doctors importing frogs for use in pregnancy tests.
Since the 1980s, amphibian species have experienced a sharp decline in their numbers. Some estimates suggest that 400 or more amphibian species have gone extinct or near extinct since the die-offs began. Scientists eventually pinpointed the major cause of the devastation: chytridiomycosis, a disease brought on by an infection by the fungus Batrachochytrium dendrobatidis, or Bd.
When Bd fins its away into an amphibian, it severely thickens the animal’s skin, disrupting its ability to breathe and take in nutrients. Some species have a 100 percent mortality rate — but others survive the infection, seemingly unaffected by the fungus.
One Bd-resistant species is the African clawed frog (Xenopus laevis). About a decade ago scientists suspected that this particular species may have served as a carrier, and facilitated the spread of chytridiomycosis, when they found Bd in a museum specimen dating back to 1934.
And now, a new analysis now links the spread of the fungus in the U.S. with the spread of X. laevis, which initially began in the early 1900s. You see, at this time people were importing large numbers of the amphibian for use in research and to use as pets. Doctors eventually discovered that the African clawed frog could also be used as a pregnancy test, further increasing the number of frogs imported.
The pregnancy test worked by injecting a woman’s urine under the skin of a female frog. If the woman was actually pregnant, her hormones would stimulate ovulation in the frog. In the 1960s, doctors phased out this practice for more reliable pregnancy tests based on hormonal readings, and many of the test frogs were probably released in the wild. Though these frogs are no longer being imported for pregnancy tests, they are still used in research.
Read the full article at: io9.com
Frog That Gives Birth Through Mouth to be Brought Back From Extinction
Worlds Cutest Frog - Desert Rain Frog
Common pesticides ’can kill frogs within an hour’
Killer frog virus sweeps Britain wiping out hundreds of thousands of amphibians
Frogs found whose toes morph into claws
Latest News from our Front Page
Wotan: The Archetype of the Awakened Aryan Man
Wotan/Woden/Odin represents the archetype of the questing and awakened Aryan man, in particular the questing and awakened Germanic man.
Whilst it is clear from our studies of Germanic mythology that Wotan was not the original primary God of the Germanic pantheon – that honour rests with Tiw/Tyr/Ziu – nevertheless, Wotan represents that questing and awakened part of the Aryo-Germanic soul more than any other deity.
In this article I wish to focus ...
Worker fired over hospital's hardline vaccination policy
Three others suspended under Waikato DHBâ€™s new rule requiring staff to be vaccinated or wear a mask.
One worker has now been sacked for defying a new hard-line policy forcing unvaccinated Waikato District Health Board staff to get flu jabs or wear masks.
A number of staff at the DHB have come forward with concerns since the Weekend Herald revealed that three ...
Bulgaria keeps out migrants with a 50 mile razor wire fence along Turkish border
Keep out: Police chief Ivan Stoyanov at the fenceStretching far into the horizon, this is the super-fence blocking thousands of migrants hoping for a new life in Europe.
As police in Calais struggle to contain thousands trying to storm the Eurotunnel in their desperation to get into Britain, the Bulgarian authorities are shoring up their border with Turkey.
The barriers around the ...
DF wants video to tell refugees to stay away
“If you want to seek happiness in Europe, Denmark is not the right place.”
That’s the message that the anti-immigration Danish People’s Party (DF) wants to send loud and clear to asylum seekers.
DF spokesman Martin Henriksen is calling on Denmark to replicate Australia by releasing a video in English and Arabic that will discourage asylum seekers from making their way ...
Dutch King Willem-Alexander declares the end of the welfare state
King Willem-Alexander delivered a message to the Dutch people from the government in a nationally televised address: the welfare state of the 20th century is gone.
In its place a "participation society" is emerging, in which people must take responsibility for their own future and create their own social and financial safety nets, with less help from the national government.
|More News » |