Scientists are calling for more research into the impact of Canada geese on the New Zealand environment.
The species was introduced to NZ in 1876, but those geese died out and the breed was re-introduced in 1905 as a gift from US President Theodore Roosevelt.
The geese are now expanding
their range, particularly in eastern areas of both North and South Islands. They compete with livestock for crops and pasture, foul farm paddocks, city parks and sports fields, and increase the risk of bird strike around airports.
They can only be hunted under licence from Fish and Game, but it can order culls if the goose population is not kept to acceptable levels. The goose's classification as a game bird is under review by the Conservation Minister.
Landcare Research scientists Eric Spurr and Jim Coleman have reviewed goose population trends, damage and control in NZ. They said that while goose damage was multifaceted, surprisingly little research had been done on the economic impacts.
"Currently, the goose population is well above the levels agreed to by farming interests," Dr Spurr said.
"As hunting alone does not keep numbers in check, research will help refine other methods. Preventing birds breeding, scaring birds and culling all have advantages and disadvantages - for example, scaring may simply shift birds around.
"Better information on control methods, population trends and of course the cost of goose damage will help enlighten decisions on the goose's future status and management."
- NZPA
