The Low Rainfall Zone (LRZ) is one of three biogeographic zones into which south west

Western Australia Western Australia (commonly abbreviated as WA) is a state of Australia occupying the western percent of the land area of Australia excluding external territories. It is bounded by the Indian Ocean to the north and west, the Southern Ocean to th ...

is divided, the others being the

High Rainfall Zone The High Rainfall Zone is one of three biogeographic zones into which south west Western Australia is divided, the others being the Transitional Rainfall Zone and the Low Rainfall Zone. The zones were first defined by Stephen Hopper in his 19 ...

and the

Transitional Rainfall Zone The Transitional Rainfall Zone (TRZ) is one of three biogeographic zones into which south-west Western Australia is divided, the others being the High Rainfall Zone and the Low Rainfall Zone. The TRZ is recognised as having a much higher diver ...

. The LRZ is considered marginal to the south west, and extends throughout much of Australia. The Zones were first defined by

Stephen Hopper Stephen Donald Hopper AC FLS FTSE (born 18 June 1951) is a Western Australian botanist. He graduated in Biology, specialising in conservation biology and vascular plants. Hopper has written eight books, and has over 200 publications to his n ...

in his 1979 paper ''Biogeographical aspects of speciation in the southwest Australian flora''. Initially, they were defined in terms of rainfall, with the LRZ being that part of the South West with annual rainfall of less than 300 millimetres (12 in). As the LRZ was marginal to his study area, Hopper did not give a clear demarcation of the zone, merely stating that it

References

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References

Further reading