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


Climate change impacts tuatara population

Climate change impacts tuatara population

A new study involving researchers from Victoria University of Wellington shows climate change could ultimately result in the extinction of a population of tuatara.

Dr Nicky Nelson, Dr Kristine Grayson and Susan Keall from Victoria’s School of Biological Sciences, in collaboration with the Department of Conservation and University of Western Australia, provide a case study of a natural population of tuatara on North Brother Island in the Cook Strait of New Zealand.

The research, published this week in the international scientific journal PLOS ONE, shows that as a result of warming temperatures, there is an accelerating decline in the proportion of adult female tuatara in the population.

“Our research reveals that as the male-bias in the population increases, female tuatara body condition, fertility rates and survival decline,” says Dr Nelson.

Projected temperature increases for New Zealand are expected to further tip the hatchling sex ratio towards males—owing to the pattern of temperature-dependent sex determination in tuatara where males hatch at warmer temperatures.

Dr Nelson says understanding the mechanisms underlying population declines is critical for preventing the extinction of endangered populations.

“If we understand the causes of decline for species, we can consider our options for management, particularly under the various scenarios for climate warming.”

Population viability models predict that without management, intervention or an evolutionary response the North Brother Island population will ultimately be made up entirely of males and become extinct.

The study demonstrates that the sex ratio in tuatara populations can be an underappreciated threat to long-term viability, particularly in populations that appear numerically stable.


© Scoop Media

Business Headlines | Sci-Tech Headlines


Hepatitis A Link: Increased Surveillance Of Imported Frozen Berries

The Ministry for Primary Industries (MPI) Director General has issued a statement warning of a potential risk associated with imported frozen berries following four human cases of Hepatitis A thought to be linked to packaged imported frozen berries. More>>


Shocking Dairy Footage: MPI Failing Our Animals And Damaging Our Reputation

Greens “Nathan Guy needs to urgently look into how his ministry is enforcing animal welfare standards, how these appalling incidents happened under its watch and what it’s going to do prevent similar incidents happening again in the future." More>>


Land & Water Forum: Fourth Report On Water Management

The Land and Water Forum (LWF) today published its fourth report, outlining 60 new consensus recommendations for how New Zealand should improve its management of fresh water and calling on the Government to urgently adopt all of its recommendations from earlier reports. More>>



Welcome Home: Record High Migration Stokes 41-Year High Population Growth

New Zealand annual net migration hit a new high in October as more people arrived from than departed for Australia for the first time in more than 20 years. More>>


Citizens' Advice Bureau: Report Shows Desperate Housing Situation Throughout NZ

CAB's in-depth analysis of over 2000 client enquiries about emergency accommodation shows vulnerable families, pregnant women and children living in cars and garages, even after seeking assistance from the Ministry of Social Development and Housing New Zealand. More>>


Get More From Scoop

Search Scoop  
Powered by Vodafone
NZ independent news