|
A rare animal that was once common
The Australian Bustard is a large, mostly ground-dwelling bird, of
grasslands and grassy woodlands. It feeds on invertebrates, small
vertebrates, seeds, fruits, flowers and soft leaf material.
Bustards require large areas to roam while they search for food and will
travel significant distances (by foot or flight) to find favourable
habitats. Large numbers may congregate in areas affected by
grasshopper or mouse plagues. They lay their eggs directly on the
ground and only the females take responsibility for incubation and
raising the young. The species has been categorised as
critically endangered
in Victoria, and is listed under the Flora and Fauna Guarantee Act
(FFG). It is also regarded as threatened in NSW and the Northern
Territory although populations in Western Australia and Queensland are
still considered to be safe.
A quick glance at the distribution map below may give the impression
that Bustards are quite widespread in Victoria. The problem with
the map is the majority of the records are sixty years old or more and
represent the locations of extinct populations. The only regularly
viewed populations of the species are in western Victoria, on the
southern boundaries of the Big Desert, and current estimates suggest
that fewer than 50 individuals may exist in the wild.
|
|
Bustards were once widespread and fairly abundant in Victoria and formed
a significant part of the diet of the Koories. They also found
their way onto the tables of early European settlers who took a much
heavier toll on the Bustard numbers than the Koories ever did.
Additions to the human diet is probably a relatively minor reason for
the species decline, the major factor being the almost complete
conversion of native grasslands to European-style pastures and
single-species crops. The lack of suitable habitat and
diversity of food, competition from sheep, cattle and rabbits, and
predation by foxes and cats (particularly of eggs and young) created
formidable obstacles for Bustards in the early parts of the 20th
century. Even the use of poisoned baits for rabbit control, which
the Bustards also ate, had a devastating effect on some local
populations. By the 1960s the numbers were so low that many
biologists thought the species had become extinct in this state.
Grasslands have become the most altered ecosystems worldwide due to
the pre-eminence of grasses and grazing animals in agricultural
economies. When European settlers arrived in Australia they looked
for grazing land for their sheep and cattle and then for suitable soils
for cereal crops. Both of these were found in the native
grasslands and grassy woodlands. As a consequence the animals and
plants that occupied these ecosystems at the time of European settlement
are now amongst the most threatened. Other grassland animals such
as the Plains Wanderer, the Eastern Barred Bandicoot and the Striped
Legless Lizard have all suffered as a result of the alienation of the
huge areas of native grassland that once covered Victoria.
© Paul Gullan, Viridans Biological Databases
|