How to build a bridge that connects fragmented ecosystems
In short: When roads divide habitats, wildlife becomes trapped in isolated pockets. But a well-designed corridor can act as a seamless transition, allowing birds, lizards, and even arboreal marsupials to navigate safely between forest fragments using clever structural and botanical interventions.
In Karawatha Forest, located 18km from Brisbane, ecologists are implementing a successful wildlife corridor project. The goal is to bridge the gap between dry Eucalypt forest and wet heathland. To facilitate movement for small birds like silvereyes, robins, and finches, the project utilizes a planted bridge that provides continuous vegetation cover, allowing them to move from tree to tree without exposure.
The mechanism for success relies on a multi-layered approach to habitat. For climbing animals like koalas and possums, high rope ladders provide essential aerial connections. On the ground, concrete underpasses serve as pathways for frogs, lizards, and various marsupials. To ensure animals stay on these safe routes and away from the road, exclusion fences are used to direct them toward their designated 'right of way'.
Botanical succession plays a critical role in the corridor's longevity. Initially, fast-growing species like wattles and bottlebrush (Callistemon viminalis) were planted to provide immediate shelter. While some early wattles are now dying, they have left behind leaf litter that provides vital habitat for lizards. In the interim, poles were planted as 'substitute trees' to support the movement of squirrel gliders until larger grey gums (Eucalyptus punctata) could grow sufficiently to take their place.
This ecological restoration is part of a broader effort to protect diverse species, ranging from the blotched hyacinth orchid to ancient basket ferns, which predate flowering plants by more than 410 million years.
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Sources
- Summary by Intellect · source: Making a bridge attractive to animals | Discovery | Gardening Australia
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