Wetlands
A Vital Habitat for Wildlife
The ponds at Yarran Dheran have been a vital habitat for waterbirds, frogs, and turtles for decades. Created in 1982 as part of the Bushland Reserve’s development, these ponds continue to play a crucial role in the ecosystem, supporting wildlife through the natural wetland cycles—adapting to dry spells, fluctuating water levels, and even blackwater events.
A Changing Environment
Originally, a water reticulation system was installed to pump water up from Mullum Mullum Creek through the three ponds, which then flowed back down to the creek via a waterfall. This system supported the ponds, providing a steady water supply. However, during the 1990s, extended droughts and changes in environmental regulations caused the fern gully to die and led to the cessation of the pumping system.
Without the reticulation system, the ponds became reliant on stormwater runoff from nearby streets. Over time, this shift has turned the ponds into ephemeral wetlands, which fluctuate with seasonal rainfall. Today, they continue to depend on stormwater diversion, making them vulnerable to drying out during dry periods.
Ephemeral Wetlands: A Natural Cycle
The ponds are ephemeral wetlands, meaning they depend on seasonal rainfall. During dry periods, the ponds may dry out, turning into mud, and occasionally experience blackwater events—both natural aspects of wetland ecology.
The Natural Wetland Cycle
Wetlands are dynamic ecosystems. Some hold water for extended periods, while others are temporary. Our ponds reflect this cycle, drying up during droughts and supporting a variety of wildlife when full.
Understanding Blackwater
When organic matter like leaves decays in low water levels, it can draw oxygen from the water, creating blackwater—dark, oxygen-poor water. While this is a natural part of wetland ecology, it can make the water unsuitable for some species during these periods.