4 March 2005
Kakapo breeding season - update
DMerton
With the kakapo breeding season now in full flight, the Department of Conservation islooking ahead to do more research
into improving breeding success.
Of six nests with 16 eggs between them on Codfish Island/Whenua Hou, only four or five were fertile, DOC national kakapo
team member Vivienne Parker said today.
“We have had 14 matings involving nine females this year so far, and we are expecting more nests over the next couple of
weeks.”
In an update of the kakapo programme completed earlier this week, DOC veteran kakapo scientist Don Merton said that
goals had been exceeded during the 10-year life of the current kakapo recovery plan 1995-2005.
“It is appropriate now to set in place new directions and goals for the next decade (2006-2016). The review team’s
report, due in June this year, will serve as a basis for the new plan.”
Among new areas of kakapo research are work on improving genetic diversity within the 83-strong kakapo population and
the relationship between rimu fruiting and triggering of breeding behaviour.
This summer staff and volunteers have been testing whether it is the eating of green or unripe fruits that cause kakapo
to initiate breeding behaviour, such as the construction of “track-and-bowl systems” which the males use for making
their courtship booming calls.
Half of the adult females and some males that are genetically under-represented in the kakapo gene pool were fed green
walnuts, while green pine conelets were fed to the remaining females and males on Whenua Hou during a trial lasting from
early November 2004 to early February 2005.
“We are, as yet, uncertain what sparked breeding this year, but if in fact it was the green supplementary foods, then
this will represent an important break-through,” Mr Merton said.
Kakapo were more likely to breed during years of heavy rimu fruiting and the programme would benefit greatly if breeding
could be induced every year, he said.
Breeding last occurred in 2002 when a record 24 chicks hatched. This year’s season would be unlikely to reproduce these
numbers because less natural food was available.
Last year’s move of juveniles and some adults was designed to improve the gene pool of kakapo, and improve the fertility
percentage in eggs. Felix, a male who has sired 30 per cent of all kakapo alive today, was moved to Chalky Island/Te
Kakahu in Fiordland to increase the chances of other males on Whenua Hou fathering offspring.
The Kakapo Recovery Programme has been sponsored by Comalco since 1990, through the Treasured Species Trust administered
by the Royal Forest and Bird Protection Society, the New Zealand Conservation Authority and DOC. For more information,
see http://www.kakaporecovery.org.nz.
Kakapo facts:
Kakapo are ground-dwelling parrots. They are excellent climbers, using their beak and claws to climb high into trees.
Kakapo are essentially flightless, capable of no more than short, wing-assisted jumps.
They are the world’s biggest parrots, weighing up to 4 kg.
In the breeding season, male kakapo swell up like a porcupine fish and emit a low booming sound that can travel up to
5km.
Kakapo look like green owls and move on the ground with a rolling gait.
They emit a strong fruity smell.
Kakapo are nocturnal and solitary, gathering only to breed.
The birds feed on seeds and fruits. It is believed that breeding is triggered by eating green rimu fruit.
They are very long lived. Richard Henry, the last surviving Fiordland bird, is believed to be at least 50 years old.
A female kakapo may lay a clutch of between one and three eggs. In exceptional years, for example in 2002, kakapo may
lay two clutches in one breeding season.
Kakapo take many years to reach breeding maturity. Males will take five years, and females, nine to 11 years.
ENDS