DiversityAn evening drift down the Pieman River in the Tarkine Wilderness Area on the west coast of Tasmania provided an opportunity to view the huge "Diversity" of plant life that occupies its banks, each lifeform working out its niche and thriving in the company of, and perhaps in symbiosis, with others. The Pieman River borders the largest undisturbed tract of rare cool temperate rainforest in Australia and the second largest in the world.