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

 


Ancient DNA ends Aussie claim to kiwi origins

23 May 2014

Ancient DNA ends Aussie claim to kiwi origins

Australia can no longer lay claim to the origins of the iconic New Zealand kiwi following University of Adelaide research published in the journal Science today showing the kiwi’s closest relative is not the emu as was previously thought.

Instead, the diminutive kiwi is most closely related to the extinct Madagascan elephant bird – a 2-3 metre tall, 275 kg giant. And surprisingly, the study concluded, both of these flightless birds once flew.

A new study by the University of Adelaide’s Australian Centre for Ancient DNA (ACAD), has solved a 150-year-old evolutionary mystery about the origins of the giant flightless “ratite” birds, such as the emu and ostrich, which are found across the southern continents. This group contains some of the world’s largest birds – such as the extinct giant moa of New Zealand and elephant birds of Madagascar.

The different “ratite” species were long thought to have formed as the flightless birds were isolated by the separation of the southern continents over the last 130 million years.

However, ancient DNA extracted from bones of two elephant birds held by the Museum of New Zealand, Te Papa Tongarewa, has revealed a close genetic connection with the kiwi, despite the striking differences in geography, morphology and ecology between the two.

“This result was about as unexpected as you could get,” says Mr Kieren Mitchell, PhD candidate with ACAD, who performed the work. “New Zealand and Madagascar were only ever distantly physically joined via Antarctica and Australia, so this result shows the ratites must have dispersed around the world by flight.”

The results correct previous work by ACAD Director Professor Alan Cooper conducted in the 1990s, which had shown the closest living relatives of the kiwi were the Australian emu and cassowary. “It’s great to finally set the record straight, as New Zealanders were shocked and dismayed to find that the national bird appeared to be an Australian immigrant,” says Professor Cooper. “I can only apologise it has taken so long!”

The team were able to use the elephant bird DNA to estimate when the ratite species had separated from each other.

“The evidence suggests flying ratite ancestors dispersed around the world right after the dinosaurs went extinct, before the mammals dramatically increased in size and became the dominant group,” says Professor Cooper.

“We think the ratites exploited that narrow window of opportunity to become large herbivores, but once mammals also got large, about 50 million years ago, no other bird could try that idea again unless they were on a mammal free island – like the Dodo.”

“We can now see why the evolutionary history of the ratites has been such a difficult problem,” says co-author Professor Mike Lee, of the South Australian Museum and University of Adelaide. “Many of them independently converged on very similar body plans, complicating analysis of their history.”

“We recently found fossils of small kiwi ancestors, which we suggested might have had the power of flight not too long ago,” says co-author Flinders University’s Dr Trevor Worthy. “The genetic results back up this interpretation, and confirm that kiwis were flying when they arrived in New Zealand.

“It also explains why the kiwi remained small. By the time it arrived in New Zealand, the large herbivore role was already taken by the moa, forcing the kiwi to stay small, and become insectivorous and nocturnal.”

Alan Tennyson, Curator of Vertebrates at Te Papa, New Zealand’s national museum, says: “The New Zealand kiwi is an integral part of this country’s culture and heritage. It’s fitting that Te Papa’s scientific collections have been used to resolve the mystery of its origins.”

ENDS

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Revenue Renewal: Tax Modernisation Programme Launched

Revenue Minister Todd McClay today released the first two in a series of public consultations designed to modernise and simplify the tax system. More>>

ALSO:

Scoop Business:
NZ Puts Seven New Oil And Gas Areas Put Up For Tender

A total of seven new areas will be opened up to oil and gas exploration under its block offer tendering system, as the New Zealand government seeks to concentrate activity in a few strategically chosen areas. More>>

ALSO:

Half Full: Dairy Payouts Steady, Cash Will Be Tight

Industry body DairyNZ is advising farmers to focus on strong cashflow management as they look ahead to the 2015-16 season following Fonterra's half-year results announcement today. More>>

ALSO:

First Union: Cotton On Plans To Use “Tea Break” Law

“The Prime Minister reassured New Zealanders that ‘post the passing of this law, will you all of a sudden find thousands of workers who are denied having a tea break? The answer is absolutely not’... Cotton On is proposing to remove tea and meal breaks for workers in its safety sensitive distribution centre. How long before other major chains try and follow suit?” More>>

ALSO:

Get More From Scoop

 
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news