The thin green line

After the 2002 predator eradication, Public Enemy #1 on Raoul is no long rats, but weeds—Mysore thorn, black passionfruit, buttercup plant and two species of guava.

Produced by New Zealand Geographic

It can be heavy-going buffalo grass, and even more difficult on the steep cliff faces which harbour Madeira vine. To date, only one species has been totally eradicated, but many weeds have been dramatically reduced in coverage.

In 2017 a menacing pathogen was discovered on the island. Myrtle rust now threatens the island’s endemic pohutukawa forests, creating biosecurity concerns both inbound and outbound.

Take away the limiting factors, and in most cases, the environment will recover. Where permanent damage has occurred, nature will find a new balance, and new species will fill old niches.

Episodes From This Location

Homeward bound

1 minute / 2019

Lions’ den

1 minute / 2019

Foreigners

1 minute / 2019

The thin green line

1 minute / 2019

Ride the mule

1 minute / 2019

Scooter with kingis

1 minute / 2019

Kiwi coral

1 minute / 2019

The epicentre

1 minute / 2019

Welcome to Sharkland

1 minute / 2019

The last roost

1 minute / 2019