How a pregnancy test for humans caused a wave of global extinctions
2013 05 17
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
Former Chief Security Officer for NewsCorp: N. Koreans Not Behind Sony Hack, Interview Leak
Hemanshu Nigam, a former federal prosecutor and former chief security officer for NewsCorp/Fox studios, says North Korea isn’t behind the Sony Hack.
Nigam gave several bullet points for why the hack was likely an inside job.
Attack code borrowed from a previous attack on Seoul, that’s why it’s in Korean. Private hackers typically borrow malicious code from other hackers.Nations state attacks follow ...
Sony Fires Back at Obama: Actually We Did Call the White House – Several Times
Sony fired back at Obama after the press conference saying they had several conversations with the Obama White House before and after the movie was canceled.
Via The Hollywood Reporter:
After President Obama criticized Sony for its decision to cancel The Interview's release after theater chains decided not to show the film, the studio has issued a statement elaborating on the move.
The Bankster International
Geopolitical analysis, the art of explaining power relationships through the prism of impersonal geography, can be a helpful tool for observers of the Great Game – but it also has its limitations. A case in point is the renewed US-Russia confrontation. Think tanks and policy insiders easily sell the narrative that from the dark days of the Cold War to ...
Another banker dies under suspicious circumstances
52-year-old Belgian Geert Tack – a private banker for ING who managed portfolios for wealthy individuals – was described as ‘impeccable’, ‘sporty’, ‘cared-for’, and ‘successful’ and so as Vermist reports, after disappearing a month ago, the appearance of his body off the coast of Ostend is surrounded by riddles…
Impeccable. Sporty. Cared for. Successful. Just some qualifications that are attributed to ...
NATO increases military presence on Russia’s borders
The Pentagon has confirmed the military buildup along Russia’s borders to ensure long-term “peace and stability” in the region.
Earlier Moscow accused NATO of a sharp increase in air activity and intelligence flights in the border zone.
Replying to RIA Novosti’s query on the increased number of NATO flights around Russia’s borders, a Pentagon representative told the news agency that the military ...
|More News » |