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.

Ends

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Scoop Business: NZ Dollar Catches Breath After "Goldilocks" Slump

The New Zealand dollar edged up following its dramatic slump yesterday after the Reserve Bank confirmed speculation it intervened in the currency market last month and PM John Key suggested a “Goldilocks” level far lower than at present. More>>

ALSO:

Biosecurity: Kiwifruit Claim To Hold Officials Accountable For Psa

Kiwifruit growers have joined forces to hold Biosecurity NZ accountable in the courts for its negligence in allowing 2010’s Psa outbreak that devastated New Zealand’s kiwifruit industry and exports. Foundation claimants representing well ... More>>

ALSO:

Poison: Anglers Advised Not To Eat Trout In 1080 Areas

With the fishing season opening in just a few days (1 October 2014), anglers are being warned by the Department of Conservation(DOC) not to eat trout from pristine backcountry waters and their downstream catchments, where the department is conducting 1080 poisoning operations. More>>.

ALSO:

Quotas: MPI Swoop On Suspected Fraudulent Fishing Activity

Ministry for Primary Industries (MPI) compliance officers swooped on a Hawkes Bay fishing enterprise today to secure evidence in an investigation into suspected fraudulent activity... “The investigation involves activity throughout the commercial supply chain – catching, landing, processing and exporting.” More>>

ALSO:

Scoop Business: Fonterra Slashes 2015 Milk Payout, Earnings Tumble 76%

Fonterra Cooperative Group cut its forecast 2015 milk price payout by about 12 percent, citing weaker global dairy prices and said there is a risk of further declines given strong global milk production. More>>

ALSO:

Scoop Business: RBNZ Keeps OCR At 3.5%, Signals Slower Pace Of Future Hikes

Reserve Bank governor Graeme Wheeler kept the official cash rate at 3.5 percent and signalled he won’t be as aggressive with future rate hikes as previously thought as inflation remains tamer than expected. The kiwi dollar fell to a seven-month low. More>>

ALSO:

Weather: Dry Spells Take Hold In South Island

Many areas in the South Island are tracking towards record dry spells as relatively warm, dry weather that began in mid-August continues... for some South Island places, the current period of fine weather is quite rare. More>>

ALSO:

Get More From Scoop

 
 
Computer Power Plus

Standards New Zealand

Standards New Zealand

Mosh Social Media
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news