Ourimbah Creek's subtropical rainforest was mostly cleared before 1940, leaving remnants that can be seen on the 1941 air photograph. Clearing slowed during World War II, as farm workers were mobilised. After the war, increasing demand for town water resulted in a weir and pumping station being built in 1977. Also, the value of creek vegetation started to be more appreciated, reflected in our Landcare group being formed in 1998. By 2000, the group had found this site that had previously been taken into public ownership for freeway construction. Given a licence to care for it, we found a few fragments of the original rainforest along the creek, and isolated trees along field boundaries. We planted pioneer species in the open areas, controlled weeds and protected naturally regenerating seedlings. Helped by grants that brought in professional help, this strategy has been successful. The rainforest has expanded into the land that had been left over from building the M1 freeway. Some 350 or so species of native biota have so far been listed, while many more are waiting to be identified.
Below are two tree species of our site, both in the family Myrtaceae and both considered vulnerable in the endangered species list.
This upper one is the magenta lilly pilly, Syzigium paniculatum. It's a small tree of subtropical rainforest and characteristic of Ourimbah Creek, although rare elsewhere. It's one of the least inflammable of trees, so it's a good species to plant near your house if you are in a bushfire-prone area. Possums like to sit in its crown to browse its foliage. Powerful owls eat the possums, so this could be a case of an endangered tree making an endangered owl less so.And below is the Wyong paperbark, Melaleuca biconvexa. It's a tree of the backswamps on the floodplain, where its characteristic canopy stands out in air photographs. It burns readily and, in the past, fire probably aided its spread by getting rid of rainforest competition. If cut to the ground by fire it sprouts again from suckers that form on the roots.
Left, a coral fungus growing on a pile of damp sticks. Fungi of many different kinds help recycle the nutrients of dead plants and animals so that they can be reabsorbed by plants. Together with mycorrhizal fungi, they help to keep nutrients like phosphorus in the floodplain rather than their being washed down to the coastal lakes.
And here's a furry little velvet mite, often a parasite on insects, but harmless to humans.
ulO Photo : Darren Rickett
Since the year 2000, we Landcarers have been restoring the original rainforest around a 2-km length of creek. Now, in 2017, the adjacent floodplain is a mosaic of rainforest, wetland and regenerating areas. Native plants, animals and fungi, new arrivals or ones we had overlooked, keep being found. Current Reports document progress. See what we look like here.