Critically endangered frogs reintroduced to the Caribbean island
of Montserrat are surviving in their new home, according to
conservationists.
Three months after releasing captive-bred frogs, the Durrell
Wildlife Conservation Trust in Jersey, UK reports they are alive
and well.
The "mountain chicken" frogs have declined by as much as 80% in
the wild.
A fatal fungal disease is affecting amphibians globally.
Described as "iconic",Leptodactylus fallaxare one of the world's
largest frog species, with females weighing over 900g.
Watch the captive frogs' microchips being checked before they are
weighed and measured
"Due to their size they have very large meaty thighs which they
use to leap long distances," said Sarah-Louise Smith, project
co-ordinator for the Mountain Chicken Recovery Programme.
Unfortunately this particular attribute caught the attention of
local hunters, leading to their curious name.
"Locally their meat is a delicacy, apparently they taste like
chicken," explained Ms Smith.
"In the past [it] was served in many restaurants and hotels to
locals and tourists that visited the island."
These human pressures were compounded by the threat of the
island's active volcano - which has rendered parts uninhabitable
since erupting in 1995.
The outlook for the frogs was described as "desperate" when
researchers discovered the infectious disease Chytridiomycosis on
the island in 2009.
With only two uninfected populations remaining, conservationists
from Durrell plus partners from London Zoo, Chester Zoo and
Parken Zoo, Sweden set out on an emergency rescue mission to
airlift 50 of the frogs from the island.
A dozen of the animals were then relocated to Jersey, UK, where
herpetology keepers were able to successfully breed the frogs in
captivity.
Unlike the "safety net" populations bred by other organisations,
Durrell staff then prepared their frogs for reintroduction to the
wild.
Following a short trial last year, 33 healthy frogs were released
onto the island in January and a field team have spent three
months tracking their movements.
"Some of the frogs were calling in the forest in the first
night," said Ms Smith who is based on the island.
"Three months later the fact that we still have live frogs in the
release site looking healthy and calling is a very encouraging
sign."
The team have spent six nights a week radio-tracking the animals,
each of which was fitted with an electronic tag before being
released.
"Some frogs will be found under ground in burrows or at the
bottom of ponds so we would never find them without this
technique," said Ms Smith.
"When we find the frogs we collect data such as location, swabs
of the skin to test for the chytrid and any signs they might be
breeding."
Although the team reported that some of the released frogs have
succumbed to the disease, Ms Smith suggested that this was
expected and could actually help scientists to better understand
the problem.
"All the information we've collected was previously unknown for
mountain chicken and will help us understand the processes that
are going on so that we are able to make informed decisions on
how to manage the species," she told BBC Nature.
Researchers will now be listening out for further signs that the
frogs are surviving.
"Between April and September the males have a very distinctive
'whooping' call that echoes around the forest to attract females
to their burrow, so we're hoping to start hearing these calls as
confirmation frogs are trying to breed," said Ms Smith.
They have also set up microphones nicknamed "frog loggers" to
monitor other parts of the island for the calls of survivors.
"We still have a long way to go with our research and there is
still a lot about the chytrid that we do not know but there are
many people local and international dedicated to the mountain
chicken and working hard to make sure we are successful," said Ms
Smith.
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