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We propose an hypothesis model to account for the infrequency of
recruitment (about once in 20 years) of western myall (Acacia papyrocarpa
Benth.), an arid zone tree. In most years, ants effectively remove and
destroy all western myall seeds. We propose that the successful
establishment of myall seedlings requires the co- occurrence of the
following: very heavy rainfall (for germination and establishment),
scarification of hard seeds (by movement of sheet flow across the land
surface) and shallow burial of seeds in soil and debris (to protect them
from the harvester ants).