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AnonymousInactivePulling species from the brink
There
are only thirteen northern white rhinos left in the world. The species
is hovering on the brink of extinction. But three men are pushing
forward the frontiers of science to try to save them.Thomas Hildebrandt
and his team, from the Berlin Institute of Zoo and Wildlife Research,
are world leaders in using artificial reproduction to breed rare
elephants, rhinos and even komodo dragons.Their work has never been
more urgent. Throughout the history of Earth, 99% of all species which
ever existed have disappeared. It is called the natural rate of
extinction.But now scientists think human activity is causing species
to disappear at up to 10,000 times this rate. Many claim the last time
this happened was 65 million years ago, when the dinosaurs died out.The great conservationist Richard Leakey has called it “the Sixth Mass Extinction”.
Only
one northern white rhino baby has been born in the last six years. Now,
the Berlin team is working with six captive animals, at the Dvur
Kralove Safari Park, 110km (70 miles) north-east of Prague, in the
Czech Republic.IVF technique
Last
summer, they inseminated Fatu, one of only two fertile females in
captivity.She had not been ovulating and needed hormone injections to
get her cycle started. Months later, the results came in and
unfortunately she did not get pregnant.”Despite the setback, we have to
continue and we are very determined,” says Dr Hildebrandt. “We know
that the work that we do is very important.”Dr Hildebrandt is now
convinced that artificial insemination alone will not save the species,
so he is developing a ground-breaking IVF technique.Working with an
international team from the Netherlands, Australia and China, he has
already successful collected an oocyte, or egg, from a female of the
more numerous southern white rhino species, at Western Plains Zoo, in
New South Wales.The egg was fertilised in vitro, in a test tube, to
produce an IVF rhino embryo.”Reproduction technology is increasingly
important for saving species,” says Dr Hildebrandt, who knows that time
is running out.Egg harvest
Later
this year, the team will start to harvest eggs from the northern white
rhino in the Czech Republic, and if all goes well, create baby northern
whites. With so few northern white rhinos remaining, the researchers
hope to use southern white rhinos as surrogate mothers.Dr Hildebrandt
and his colleague Frank Goeritz were brought up in the former East
Germany. They both suffered under the former communist regime and were
initially not allowed to attend university, because of their
middle-class background.Instead, they had to work as porters in an
agricultural vet college. However, Dr Hildebrandt persuaded the head of
the institute to allow him to study for a degree. That is when he
started work on artificially inseminating cattle.Within a few years,
the zoologist was working with wild animals. Such was his passion for
the subject that when the Berlin wall came down in 1989, he was too
busy inseminating rare animals at the East Berlin Zoo to join the
millions of his compatriots crossing to the West.Since then, the team
has travelled ceaselessly across the world. Zoos and conservation
projects from Australia to California have requested their services to
boost breeding programmes.Unexpected obstacles
However,
the German scientists often confront unexpected obstacles on their
travels.Last October Dr Hildebrandt collected semen from a male
elephant at Pittsburgh Zoo, to use for inseminating a female elephant
3,000km away in Salt Lake City.The semen had to be placed in carry-on
baggage, to avoid it being exposed to extreme temperatures or cosmic
rays.At the time, liquids could not be transported on American planes,
following the attempted terrorist attacks on transatlantic planes in
August 2006.Initially, airport security refused to give the go ahead
and the project appeared doomed. Only after the intervention of the
head of Pittsburgh Zoo did airport security officials relent, and allow
Dr Hildebrandt and his elephant semen on board the plane.But even then,
Dr Hildebrandt, and the elephant semen, had to be escorted by a
bodyguard through the airport. Happily, the semen arrived within the
eight-hour deadline, just in time to inseminate Christy, the female
elephant at Salt Lake City Zoo.So far, Dr Hildebrandt and fellow
zoologists, Frank Goeritz and Robert Hermes, have successfully created
19 successful elephant calves. They are helping to create a captive
breeding programme so that zoos will not be dependent on animals
captured from the wild.But their biggest challenge is the northern
white rhino where the stakes are far higher. It is the second largest
land mammal and has lived on Earth for 50 million years, but is now
dependent on Dr Hildebrandt’s team for its survival. -
AuthorMarch 22, 2007 at 9:58 AM
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