Video | Business Headlines | Internet | Science | Scientific Ethics | Technology | Search

 


Weevil rescue underway

31 March 2006

Weevil rescue underway

Click for big version

A speargrass weevil on Mana Island. Photo: Andrew Morrison/DOC

********

A rescue mission has been mounted for a population of weevils living on a knife edge on Wellington’s south coast.

Department of Conservation staff and volunteers are risking a slashing from the sharp, blade-like leaves of the native plant speargrass to retrieve large flightless weevils that depend on the plant for their survival. Under threat from introduced mammals and habitat modification and in danger of extinction, this only North Island population of speargrass weevils (Lyperobius huttoni) is being transferred to the safety of predator-free Mana Island.

DOC Mana Island ranger Tony Henry places a weevil into the sharp foliage of speargrass on Mana Island. Photo Andrew Morrison

*********

Seven weevils were taken to Mana Island this week as DOC implements a plan to move up to 30 weevils from the south coast to the island, where there is an abundance of speargrass as well as climatic conditions which match those on the south coast. It is hoped they will establish a self-sustaining population there so Wellingtonians won’t lose what is probably their most locally rare and endangered native animal.

DOC Poneke biodiversity ranger Andrew Morrison said most speargrass weevils were found in the South Island, on the eastern side of the Southern Alps.

“In the North Island they are restricted to this one small population which is also New Zealand’s only coastal population of the species”

Speargrass (Aciphylla species) is an alpine species, but it grows along Wellington’s south coast and on Mana Island because the dynamic environment of Cook Strait is similar to the alpine environment. Speargrass weevils live and feed exclusively on the plant. The adults, which grow up to 2 cm long, feed on the leaves and shelter in the leaf litter under the plant, while the larvae develop in the soil, feeding on the speargrass roots. They live for three years, one as a larva and two years as an adult.

“There are probably not many people aware of these cryptic little creatures in Wellington, but they are an important part of our biodiversity and they are threatened with extinction,” Mr Morrison said.

“Mice and rats prey on the weevils and wild goats and pigs destroy the speargrass plants.”

Attempts have been made to fence off areas of speargrass plants, kill the mice and rats with poison baits, and replant new areas of speargrass but the weevil population had continued to decline, he said.

“Studies have estimated their numbers to have dropped to around 150 individuals so it’s vital that we move them from the vulnerable south coast location to a secure site where their numbers can increase.”

Work will continue to restore the south coast site so one day the weevils can be returned to their original habitat.

Meanwhile they are expected to thrive on Mana Island, alongside species introduced to the island as part of a long term plan to restore its natural ecology. Friends of Mana Island (FOMI), which is behind the restoration project, has committed more than $1000 in funding and volunteer support toward the weevil transfer.

“We are pleased that yet another creature is able to take advantage of all the work being undertaken on Mana Island over the years to make it a safe refuge for a variety of endangered flora and fauna,” FOMI president Brian Paget said.

Takahe, North Island robin, brown teal, diving petrels, fairy prion, fluttering shearwater, yellow-crowned kakariki, speckled and spotted skinks, Wellington green geckos and flax weevils have also been transferred to the island. A wetland has been restored and hundreds of thousands of native trees have been planted by volunteers.

ENDS


© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Budget Policy Statement: Spending Wins Over Tax Cuts; Big Ticket Items Get Boost

Income tax cuts are on hold as the government says “responding to the earthquakes and reducing debt are currently of higher priority”, although election year tax sweeteners remain possible. More>>

ALSO:

Fishy: Is Whitebaiting Sustainable?

The whitebait fry - considered a delicacy by many - are the juveniles of five species of galaxiid, four of which are considered threatened or declining. The SMC asked freshwater experts for their views on the sustainability of the whitebait fishery and whether we're doing enough to monitor the five species of galaxiid that make up whitebait. More>>

ALSO:

Crown Accounts: Smaller-Than-Expected Four-Month Deficit

The New Zealand government's accounts recorded a smaller-than-forecast deficit in the first four months of the fiscal year on a higher-than-expected inflow of corporate and goods and services tax. More>>

ALSO:

On For Christmas: KiwiRail Ferries Back In Full Operation After Quake

KiwiRail’s Interislander ferries are back in full operation for the first time since the Kaikoura earthquake, with the railspan that allows rail wagons to be loaded on the Aratere now restored. More>>

ALSO:

Comerce Commission Investigation: Prosecutions Over Steel Mesh Labelling

Steel & Tube Holdings, along with two other companies, will be prosecuted by the Commerce Commission following the regulator's investigation into seismic steel mesh, while Fletcher Building's steel division has been given a warning. More>>

ALSO:

Wine: 20% Of Marlborough Storage Tanks Damaged By Quake

An estimated 20 percent of wine storage tanks in the Marlborough region, the country’s largest wine producing area, have been damaged by the impact of the recent Kaikoura earthquake. More>>

ALSO:

ACC: Levy Recommendations For 2017 – 2019 Period

• For car owners, a 13% reduction in the average Motor Vehicle levy • For businesses, a 10% reduction in the average Work levy, and changes to workplace safety incentive products • For employees, due to an increase in claims volumes and costs, a 3% increase in the Earners’ levy. More>>

Get More From Scoop

 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news