island conservation lord howe island restoration

Restoration of Lord Howe Island Offers High ROI

Removal of invasive rodents from Lord Howe Island, Australia would yield high return on investment. 

How would you like a 15-to-1 return on your investment?

The recently released Public Environment Report (PER) for the Lord Howe Island rodent eradication calculates that the net social benefit from implementing the plan is $141M over 30 years. That is 15 times the cost. This is an extraordinary return on a $9M project–so what is behind these numbers?

First off, the environmental returns on the removal of invasive rodents from the World Heritage-listed island are well documented in the PER. Among other benefits, the restoration project is is expected to prevent seven additional extinctions over the next 20 years and to permit four species to be returned to the island after having previously been lost due to predation by invasive rats and mice. A unique and endangered palm-forest ecosystem would be restored to health and other World Heritage values maintained.

island conservation stick insect lord howe

The Lord Howe Stick Insect used to live on Lord Howe Island prior to introduction of invasive rodents. The insect is longer found on the island, but was discovered by scientists on nearby Ball’s Pyramid—providing hope for relocation one day when the island is rodent-free. Photo: Wikimedia

However, in what appears to be a world’s first, the Lord Howe Island Board has also calculated the socio-economic impacts expected from the removal of all invasive rodents on the island. To achieve this, the consultants commissioned by the Board compared the likely economics outcomes from two scenarios—the island ecosystem with and without invasive rodents—over a 30-year period. The major costs of the “without rodents” scenario are simply the capital cost of the operation itself—which involves a helicopter and ground-based operations and a staff of around 30-40 people over several months. Another cost is the ongoing need to maintain and improve biosecurity so that rodents do not re-invade. An additional short-term cost to the tourism industry is also expected, although this is quite small as the operation will take place in the off-season (winter) when there are fewest visitors. This loss will be more than compensated for by the temporary workforce in any case.

island conservation lorde howe island landscape

Lorde Howe is a vibrant, diverse island. Credit: Peter Pham

The tourism industry ultimately wins out. The report estimates that without rodents, and with more abundant wildlife, the prestige of Lord Howe Island as a nature-tourism destination will increase (and so too the price they can charge).

The other major economic benefit comes from the prevention of extinctions and the return of species lost from the island. Studies have found that the community has indicated willingness to pay up to $8M to avoid the extinction of species. The additional economic benefits of an increase in abundance of non-threatened species were not costed, but would also add to the overall socio-economic tally. For many people on the island, the economic benefits from improved production of Kentia Palm seeds (a popular ornamental palm sold around the world) and local fruit and vegetables, largely completes the picture.

island conservation lord howe fruit

Fruit on Lord Howe Island. Credit: Pete the Poet

I fell in love with Australia’s Lord Howe Island when I was a graduate student and helped to survey the island’s endangered woodhens. I have been following the proposed removal of invasive rodents from Australia’s Lord Howe Island now for over 16 years. I have never had any doubt about the ecological benefits of restoring the rodent-free status of Lord Howe Island. It is great to see that the economic analysis agrees with me.

You too can have your say on the importance of a rodent-free Lord Howe: Lord Howe Island Board

Featured image: Beach on Lord Howe Island. Credit: Patchtok

About Ray Nias

With his scientific and management background, fundraising experience and knowledge of the Southwest Pacific region, Ray is ideally placed to help make Island Conservation a major force for island conservation in the Southwest Pacific region.

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