Explore the environmental challenges facing Tasmania’s relict ecosystems, including fire, drought, and climate change. Learn why urgent action is needed.
The earth's climate is changing at a rapid pace, and isn't showing any signs of slowing. Tasmania's climate is changing with it. Temperatures are predicted to increase, and rainfall will change in frequency and in amount. Due to this, fires in our alpine regions are predicted to occur more frequently and with greater intensity. Some of these areas haven't seen fire for untold thousands of years, and the species that grow there have no natural resistance to these events. When fires and drought come through, these ecosystems die, with little chance for recovery. You can see what fire does to the relict ecosystems it does manage to touch. In many areas of Tasmania, the skeletons of burnt King Billy pines litter the sides of mountains, where there once was a forest. There won't be relict ecosystems left if we don't take action and become their custodians.
A large challenge that these species present in regard to their conservation is their growth and reproduction habits. For seed banking, you need seeds that can be stored for long periods of time, and unfortunately for both of our Nothofagus species, their seeds need to be germinated roughly within a year of harvest, as germination rates will drop dramatically each following year. Additionally, Nothofagus species have mast years (lots of seed production every few years, with minimal in between). Furthermore, almost all of our relict species have slow rates of growth, which means that reforestation efforts need to be planned years in advance if they aim to respond quickly to land disturbance.
A changing climate also means that as time passes, the land where these relict species currently grow will become less and less habitable. This may mean that we need to selectively breed these species for heat and drought tolerance to keep them where they are, or become extremely active in the management of them and the land where they grow.
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