GENEVA, July 5, 2018 (BSS/AFP) – Australia’s reptiles, including lizards
and snakes, are facing growing threats from invasive species and climate
change, with seven percent on the verge of extinction, conservationists said
Thursday.
In an update to its “Red List” of threatened species, the International
Union for Conservation of Nature (IUCN) said virtually all of Australia’s
unique reptile species were now considered threatened and that one in 14
risked extinction.
“This Red List update highlights the vulnerability of Australia’s lizards
and snakes to invasive alien species,” Philip Bowles, who coordinates IUCN’s
work on snakes and lizards, said in a statement.
A full 975 Australian reptile species are currently on the Red List, IUCN
said, adding that the vast majority of the threatened species were endemic to
Australia.
The island continent is home to an unusually diverse reptile population,
which evolved in isolation and represents almost 10 percent of the global
reptile fauna.
Invasive species are the main threat to most of the threatened reptiles in
Australia, IUCN said, pointing to a recent study showing that invasive feral
cats alone kill about 600 million reptiles each year in the country.
The Grassland Earless Dragon, a small lizard with a stout body and short
limbs widely hunted by feral cats, has been pushed from the list’s
“vulnerable” to the “endangered” category.
Another invasive species threatening Australia’s reptiles, IUCN said, is
the toxic cane toad — the world’s largest toad, which is native to Central
and South America.
The toad, which has poison glands that can kill its predators, was
introduced to Australia in 1935 with the aim of reining in beetles ravaging
the country’s sugar cane fields.
It was largely unsuccessful at that endeavour but has proven catastrophic
for reptiles like the semi-aquatic Mitchell’s water monitor lizard, which has
now been categorised as “critically endangered”.
“Dining on the toxic cane toad has resulted in population declines of up
to 97 percent in some areas,” IUCN said.
It noted that Australia’s reptiles were particularly vulnerable to the
toads since no native species on the continent produce the same toxins.
Climate change is also taking its toll, IUCN said, pointing to the Bartle
frere cool-skink, a long-tailed cold-adapted lizard found only on the summit
of Queensland’s tallest mountain, Mount Bartle Frere.
It is currently listed as “vulnerable”, but IUCN warned that an average
temperature increase of one degree Celsius would “likely result in a loss of
50 percent of the cool-skink’s population within 30 years.”
– ‘Onslaught of threats’ –
Australia’s reptiles are not the only species at risk: The Red List now
includes 93,577 animal and plant species from around the world, including
26,197 threatened with extinction.
“Today’s IUCN Red List update reveals the onslaught of threats that our
planet’s biodiversity is facing,” IUCN chief Inger Andersen warned in a
statement.
The updated list showed that a full 74 percent of assessed insect species
on Portugal’s Azores islands are threatened with extinction, due largely to
habitat degradation, invasive plant species and a drying climate.
On the Indian Ocean islands of Mauritius and Reunion, a large bat species
called the Mauritian Flying Fox has now been listed as “endangered”, after
the population shrank by 50 percent between 2015 and 2016 amid a government
programme to cull bats.
And three species of Japanese earthworms are now facing extinction, IUCN
said, pointing to radioactive fallout from World War II and the 2011
Fukushima nuclear reactor explosion.
BSS/AFP/ARS/1824 hrs