Ecological Restoration Plan
Because poisons and trapping, traditional methods of pest control, have limited success and seldom last long, the creators of the plan decided to enclose the 34 square kilometres of bush with a 47 km pest-exclusion fence. When the environment is rendered suitable, the area will be repopulated with the entire suite of charismatic species that may now be locally extinct, such as kiwi, kokako, kakariki, tuatara and many others. Kaka already visit regularly and are likely to become resident if suitable methods are employed.
In November 2003, the Trust constructed two exclosures, at the north and south of Maungatautari, totalling 1.1 square kilometres. The Trust used these areas to demonstrate the fence's feasibility and to test pest removal methods, which were launched in September 2004. The exclosures are now predator-free and were used as holding areas for native species while the main fence was being built.
In July 2004, the Trust began constructing the Xcluder fence. In September 2006 the Trust completed fencing the entire 34 square kilometres to exclude all pests (and was able to take advantage of parts of the exclosures' fencing constructed at Stage 1). Then the Trust began eliminating pests by dropping poison, starting with brodifacoum in November 2006. A second application was made in December 2006. The combined effect of the poison, trapping and hunting eliminated brown rats, black rats, stoats, cats, weasels, ferrets, red deer, fallow deer, pigs, goats, possums, hedgehogs, rabbits and hares. In 2007 the sole remaining pest species was mice, and poison was dropped a third time, in September that year, to eradicate them. Mice haven't been eradicated, but remain in much lower numbers.
One of the greater challenges facing the designers of the Xcluder fence adopted for the purpose was addressing entry at streams. Since water levels fluctuate and a fence needed to address both debris and fish migration, the Xcluder was outfitted with an electronic surveillance system to alert the Trust if a watergate fails to properly close. There have been other challenges with the fence, including storm damage in July 2007 that was quickly repaired.
In July 2006, a viewing tower was constructed near a northern rata grove in the southern exclosure.
Read more about this topic: Maungatautari Restoration Project
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