 Other woodland species can rapidly use these increased nitrogen levels provided by the nodules of bacteria present in their expansive root systems.Hence they play a critical part in the natural regeneration of Australian bushland after fires.Mycorrhizal fungi attach to the roots to produce food for marsupial animals, and these animals in turn disperse the spores in their droppings to perpetuates the symbiotic relationship between wattle's roots and the mycorrhizal fungi.