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Home / Lifestyle

Saving species may need controversial methods

NZ Herald
24 Jul, 2014 11:00 PM3 mins to read

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Translocation has been attempted with species such as the Tasmanian Devil. Photo / Thinkstock

Translocation has been attempted with species such as the Tasmanian Devil. Photo / Thinkstock

Intensive and sometimes controversial forms of threatened species management may be needed to reverse the increasing rate of global biodiversity losses, a University of Otago zoologist says.

In a review article in leading international journal Science, Professor Philip Seddon and his co-authors examine the growing role that "conservation translocation" - the movement and release of plants and animals to re-establish new populations - is playing in efforts to combat biodiversity loss.

The researchers write that the traditional goals of "having self-sustaining wildlife populations within pristine landscapes untouched by human influence" are "increasingly unobtainable".

They instead suggest that creating "wildness" rather than restoring "wilderness" is the most practical way forward.

This "rewilding" approach may involve translocations to restore ecological processes, such as predator-prey interactions, within landscapes shared by humans and wildlife.

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Reintroduction of species previously indigenous to an area has been the most widely applied type of translocation, but Professor Seddon said reviews of reintroduction outcomes have shown generally low levels of success.

"Also, such reintroductions are often biased towards 'charismatic' animals, such as large mammals, regardless of how endangered they are compared to other species."

One controversial form of translocation on the rise was so-called "conservation introductions", through which species are brought into areas outside of their historic range for conservation benefit.

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This included the contentious practice of ecological replacement, where an appropriate substitute species is released to restore an ecological function lost with the extinction of the original species.

A giant tortoise. Photo / NZH

"Examples include the release of exotic species of giant tortoise to restore the grazing functions and seed dispersal lost through tortoise extinctions on islands in the Indian Ocean."

Conservation introduction could also involve assisted colonisation, where species were moved outside their range to prevent extinction due to threats in their native habitat.

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"Examples of this include moving native birds, such as kakapo to predator-free offshore islands to protect them from exotic predators in mainland habitat. Other such efforts include establishing a facial cancer-free colony of Tasmanian Devils on Maria Island off the coast of Tasmania."

The Kakapo is a bird native to New Zealand.

Professor Seddon said the major challenge was how to apply the range of translocation tools available to maximise conservation benefit while minimising the risk of unintended consequences.

"The prospect of bringing back extinct species through advanced technologies creates a further conundrum. If potential de-extinction of multiple species does become a reality, which species should be resurrected, and which habitats should they be introduced to?"

In their conclusion, Professor Seddon and his co-authors write that conservation translocation projects could provide a "powerful means to reconnect people with their natural heritage, to engage them as conservation partners, and make them stewards of the wild animals and habitats around them".

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