This
is a menagerie of megafauna that inhabited Australia some 45,000 years ago
During the last Ice Age, Australia,
Tasmania and New Guinea formed a single landmass, called Sahul. It was a
strange and often hostile place populated by a bizarre cast of giant animals.
Australian aborigines, who made an appearance
approximately 50,000 years ago, either hunted them into extinction or gradually
destroyed the habitat they required by practices such as fire-stick burning
There were 500-pound kangaroos,
marsupial tapirs the size of horses and wombat-like creatures the size of
hippos. There were flightless birds that weighed twice as much as modern emu,
33-foot snakes, 20-foot crocodiles, 8-foot turtles with horned heads and spiked
tails, and giant monitor lizards that measured greater than 6 feet from tip to
tail and were likely venomous.
By about 30,000 years ago, however,
most of these ‘megafauna’ had disappeared from the Sahul as part of a global
mass extinction that saw the end of nearly all of the super-sized animals that
had evolved to survive in extreme Ice Age climates. The factors that forced the
Australian megafauna into extinction remain a matter of considerable
controversy. Many experts argue that the ancestors of the Australian
aborigines, who made an appearance approximately 50,000 years ago, either
hunted them into extinction or gradually destroyed the habitat they required by
practices such as fire-stick burning. Others argue that the gradual drying out
of Australia and weakening of the Australian monsoon played a major role in
their demise.
A new study has compared the diet of
a variety of Australian megafaunal herbivores from the period when they were
widespread (350,000 to 570,000 years ago) to a period when they were in decline
(30,000 to 40,000 years ago) by studying their fossil teeth. The analysis
suggests that climate change had a significant impact on their diets and may
well have been a primary factor in their extinction.
“We have found evidence that, as the
climate was changing and getting drier, animal diets were shifting
dramatically,” said Larisa DeSantis, assistant professor of earth and
environmental studies at Vanderbilt University, who directed the study. “If
climate change was a primary or contributing factor in their demise, as it
appears, we need to pay more attention to how current levels of climate change
are affecting animals today.”
The results of the study are
described in a paper titled “Dietary responses of Sahul (Pleistocene
Australia-New Guinea) megafauna to climate and environmental change” published
Jan. 26 by the journal Paleobiology. Co-authors on the paper are Judith Field
and John Dodson from the University of New South Wales and Stephen Wroe from
the University of New England.
Michael Archer, a leading Australian
paleontologist at the University of New South Wales who was not involved in the
study, commented, “This new study, based on hard evidence, makes it clear that
changes in late Pleistocene climate had a major impact on the late Pleistocene
megafauna of Australia, adding even more evidence to challenge the imaginative
a priori assumption that ‘blitzkrieg’ by early humans caused the extinction of
this continent’s lost megafauna. Climate change clearly has been in the past
and will continue to be a major cause of extinction into the future.”
The teeth that were analyzed came
from the Cuddie Springs site in southeastern Australia. It is located on a
prehistoric ephemeral lake and it is the only site on mainland Australia that
has produced fossil evidence of the co-existence of humans and megafauna.
“Unfortunately, many of the advocates of the human predation hypothesis have
discounted Cuddie Springs because it does not support the popular ‘blitzkrieg’
theory that maintains the megafauna went extinct in the 1,000-year period after
humans arrived on the scene,” said DeSantis.
It’s amazing how much information
about the prehistoric environment paleontologists can extract from fossil teeth
using a dental drill, dental impression material and some sophisticated
instruments. The ratios of oxygen and carbon isotopes locked in the enamel
provide clues about the animals’ diet and the average temperature and humidity
of the environment at the time the teeth formed.
Differences within individual teeth
mirror climate variability. Analysis of the microscopic scratches on the
surface of the teeth provides evidence of what the animal was eating in the
last few weeks of its life. Differences in wear-patterns can differentiate
between animals that were grazing on grass and browsing on bushes.
“For example, we know from the
analysis of modern day kangaroos that oxygen isotope ratios in their teeth are
highly correlated with the relative humidity and amount of precipitation in
their environment,” DeSantis said. “This makes them ideally suited for tracking
changes in aridity over time.”
During the megafaunal heyday around
500,000 years ago, the dental analysis revealed that the climate was semi-arid.
In addition, the animals’ diets were highly variable, implying that there were
a number of ecological niches available to them. That contrasts markedly with
the period from 30,000 to 40,000 years ago. Here, the analysis indicates that
the climate was substantially drier and the diet of the giant herbivores was
considerably more restricted.
“It appears that long-term
aridification may have reduced the ability of megafauna to consume certain
types of plants, including salt-bush. Eating salt-rich plants requires drinking
additional water that was less available and likely increased competition for
similar plant resources,” said DeSantis. “These data clarify the impacts of
climatic change on marsupial megafauna and suggest that the long-term drying
out of Australia, identified here and in other records, likely played a key
role in the decline and disappearance of this unique suite of animals.”
Credit:
Peter Trusler, Monash University
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