Closing the loop. Circular Fencing for Nature
Cost effective pest control strategies are becoming increasingly important for farmers, catchment groups, and restoration practitioners as funding constraints tighten and the scale of biodiversity protection required across productive landscapes continues to grow. Within the Karamū Catchment, the prevalence of orchard and vineyard infrastructure presents a practical opportunity to rethink how existing horticulture bi product can be reused to support ecological restoration and a circular economy within our catchment. Rather than viewing retired orchard and vineyard posts as waste, there is an opportunity to repurpose this material into functional biodiversity protection infrastructure that delivers both economic and environmental value.
The underlying principle of this project is that pest control systems should be assessed not only on ecological effectiveness, but also on cost efficiency, scalability, and long-term sustainability. Any system that either reduces the cost of predator control while maintaining effectiveness, or improves conservation outcomes at a comparable cost, should be considered a viable innovation pathway. In this context, ungulate exclusion fencing remains one of the most widely used and effective tools in New Zealand for protecting small reserves and restoration areas from browsing pests, particularly deer.
As feral deer populations continue to spread into new landscapes in search of food it increases pressure on native ecosystems, restoration plantings, and productive farmland. Their cumulative impact on biodiversity is significant and ongoing, reinforcing the need for effective, scalable, and affordable exclusion and control methods.
This project responds to that need by testing whether a low-cost deer exclusion fencing system, using reused orchard and vineyard posts, can deliver effective biodiversity protection while reducing infrastructure costs and environmental footprint. It is designed as a practical demonstration of how circular resource use within the catchment can be inline with improving conservation outcomes.
