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
Netanyahu ‘spat in our face,’ White House officials said to say
The White House’s outrage over Prime Minister Benjamin Netanyahu’s plan to speak before Congress in March — a move he failed to coordinate with the administration — began to seep through the diplomatic cracks on Friday, with officials telling Haaretz the Israeli leader had “spat” in President Barack Obama’s face.
“We thought we’ve seen everything,” the newspaper quoted an unnamed senior ...
The Return of the Protected Jewish Minority in Europe
Contrary to the standard narratives of Jewish ‘history,’ a prominent feature of the historical presence of Jews in Europe has been their protected status. The common context for this status was a symbiotic relationship between the Jewish minority and exploitative or tyrannical elites. As agents of the feared elite, as foreigners, as exploiters in their own right, and with interests ...
Truth Revealed: McCain’s ‘Moderate Rebels’ in Syria ARE ISIS
Poor John McCain and Lindsey Graham, Washington’s real first couple. They only want to arm the ‘moderate opposition’ in Syria. Three years on, how come their master plan isn’t working, while ISIS has grown so strong?
Despite what media lauded as, “the largest demonstration in France’s history – bigger than liberation at the end of WWII!” (can you rightly compare the ...
European 'No-Go' Zones: Fact or Fiction?
Comment: This is an interesting article about Muslim no-go Zones in Europe. However, keep in mind that the focus in this piece is not addressing the root of the problem, but a symptom of the problem. Yes, there is an issue with large Islamic colonies in Europe today, but the article mentions nothing about who has changed the immigration laws ...
A Radical Traditionalist Critique of the Anti-Islam Movement
The terrorist attack against the staff at the magazine Charlie Hebdo in Paris shook an entire continent. In a European climate in which protests against the perceived Islamization of our civilizational sphere becomes ever more widespread, showing in increased electoral success for moderate nationalist parties, as well as in expressions of mass public dissent, the recent resurgence of violent Islamic ...
|More News » |