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a remote area of inland Australia. Most
of the time, the lake is completely dry. Without water, a salt crust nearly half
a metre thick covers a quarter of the surface. Several major rivers empty into Lake Eyre but carry water only about once every ten years. When water does reach Lake Eyre, as occurred in late 2010, early 2011 and early 2012, large numbers of birds return to breed.
The explosion in the populations of ibis, pelicans and other bird species
in Lake Eyre in 2010–2012 has been striking. During droughts, Lake Eyre is a salt flat with few animals visible. When it
fills with water during high-rainfall years, due to excessive flow of fresh water
from rivers in outback Queensland, it
is virtually a freshwater lake. Native freshwater fish such as bream and golden perch can live in it until it becomes too salty due to evaporation.
• Identify the abiotic factors in components of the ecosystem at Lake Eyre that affect populations.
• Explain the word ‘sustainable’.
• Could the lake ecosystem be described as a sustainable ecosystem? Discuss.
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