
Scientists solve the 320-year-old mystery of how the Falklands wolf ended up on the island: It skated across a
frozen sea chasing a penguin
Experts were baffled by how the now extinct animal
crossed the sea
Mystery was first recorded in 1690 - and raised again by
Charles Darwin
Researchers analysed DNA from famously tame animal found
by Darwin
Published: 18:13, 6 March 2013 |
Updated: 18:25, 6 March 2013
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It is a mystery that has puzzled biologists - including
Charles Darwin - for 320 years.
Biologists had been unable to work out how the Falklands
wolf came to be the only land-based mammal on the isolated islands, which are
460km from the nearest land, Argentina.
Previous theories have suggested the wolf somehow rafted on
ice or vegetation, crossed via a now-submerged land bridge or was even
semi-domesticated and transported by early South American humans.
Illustration of 'Dusicyon australis', the Falklands
wolf, from Zoology of the Voyage of H.M.S. Beagle. Researchers have now solved
the mystery of how the wolf gor to the Flaklands - and say it skated across a
frozen sea
THE FALKLANDS WOLF
The Falkland Islands wolf (Dusicyon australis), is also
known as the warrah and occasionally as the Falkland
Islands dog.
It was the only native land mammal of the Falkland
Islands until it became extinct in 1876, making it the first known
canid to have gone extinct in historical times.
The first recorded sighting was by Captain John Strong in
1690. He took one, but during the voyage back to Europe
it became frightened by the firing of the ship's cannon and jumped overboard.
When Charles Darwin visited the islands in 1833 he found the
species present on both West and East Falkland,
and tame, but numbers were dwindling and he predicted that the animal would
join the dodo among the extinct within 'a very few years.'
Islanders hunted it for its fur, and were also concerned it
would attack sheep.
Now, University
of Adelaide researchers
have found the answer - and say the animals skated across a frozen sea,
probably chasing a penguin or seal.
Researchers from the University’s Australian Centre for
Ancient DNA (ACAD) extracted tiny pieces of tissue from the skull of a specimen
collected personally by Darwin.
The 320-year-old mystery was first recorded by early British
explorers in 1690 and raised again by Charles Darwin following his encounter
with the famously tame species on his Beagle voyage in 1834.
The findings were published in Nature Communications today
and concluded that, unlike earlier theories, the Falkland Islands wolf
(Dusicyon australis) only became isolated about 16,000 years ago around the
peak of the last glacial period.
'The eureka moment was finding evidence of submarine
terraces off the coast of Argentina,'
says study leader Professor Alan Cooper.
'They recorded the dramatically lowered sea levels during
the Last Glacial Maximum (around 25-18,000 years ago).'
'At that time, there was a shallow and narrow (around 20km)
strait between the islands and the mainland, allowing the Falkland Islands wolf
to cross when the sea was frozen over, probably while pursuing marine prey like
seals or penguins.
'Other small mammals like rats weren’t able to cross the
ice.'
The team also used samples from a previously unknown
specimen, which was recently re-discovered as a stuffed exhibit in the attic of
Otago Museum
in New Zealand.

The 'submarine terraces' that enabled the Falklands wolf to
cross from Argentina
during the Last Glacial Maximum (around 25-18,000 years ago). The image shows a
shallow and narrow (around 20km) strait between the islands and the mainland

The yellow dots show the areas in Argentina the relatives of the
Falklands Wolf were found, and the red marks its population on the island

'Previous studies used ancient DNA from museum specimens to
suggest that the Falkland Islands wolf diverged genetically from its closest
living relative, the South American maned wolf (Chrysocyon brachyurus) around
seven million years ago,' said Associate Professor Jeremy Austin, Deputy
Director of ACAD and co-lead author with Dr Julien Soubrier.
'As a result, they estimated that the wolf colonised the
islands about 330,000 years ago by unknown means.
'Critically, however, these early studies hadn’t included an
extinct relative from the mainland, the fox-like Dusicyon avus.
'We extracted ancient DNA from six specimens of D. avus
collected across Argentina
and Chile,
and made comparisons with a wide group of extinct and living species in the
same family.'
ACAD’s analyses showed that D. avus was the closest relative
of the Falkland Islands wolf and they
separated only 16,000 years ago – but the question of how the island
colonisation came about remained.
The Falkland Islands wolf (Dusicyon australis), also known
as the warrah and occasionally as the Falkland Islands
dog.
It was the only native land mammal of the Falkland
Islands until it became extinct in 1876, making it the first known
canid to have become extinct in historical times
The Falklands wolf had baffled scientists, as they could not
work out how it crossed from Argentina
The first recorded sighting was by Capt. John Strong in
1690.He took one, but during the voyage back to Europe it became frightened by
the firing of the ship's cannon and jumped overboard.
When Charles Darwin visited the islands in 1833 he found the
species present on both West and East Falkland,
and tame, but number were dwindling and he predicted that the animal would join
the dodo among the extinct within 'a very few years.'
Islanders hunted it for its fur, and were also concerned it
would attack sheep.