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

 


Comprehensive protection required to save Hector’s dolphin

hectors dolphin
jumping

Monday 8 April 2013

Comprehensive protection required to save Hector’s dolphin

New Zealand’s heavily endangered Hector’s dolphin population could recover if protection measures were extended out to 100m deep throughout its habitat, according to a new University of Otago review.

Zoology Associate Professor Liz Slooten’s review into the effectiveness of area-based management to reduce dolphin bycatch found that such an approach can succeed if certain key criteria are met.

These include the protected area being large enough, in the right location and key threats being effectively managed as well as removing impacts from fishing rather than displacing them and ensuring no new threats are added (such as marine mining, tidal energy generation, or pollution).

The review is published in the international journal Endangered Species Research.


Left map: NZ dolphin distribution in red. Protected areas in green. New Zealand and overseas experts have urged the NZ government to 'turn the red sea green' and protect NZ dolphins out to the 100 metre depth contour, throughout their distribution (see right map).

Associate Professor Slooten says that a long-term study of the Banks Peninsula marine mammal sanctuary shows that protected areas, where gillnets and trawling are banned, can work.

“At Banks Peninsula, survival rates have increased by 5.4% since the sanctuary’s creation in 1988, and the previously rapid population decline has slowed substantially.

“However, nationwide, Hector’s dolphins continue to slide towards extinction, mainly due to continuing bycatch in areas with few or no dolphin protection measures,” she says.

Examples include the lack of any dolphin protection off the South Island north coasts, and that Hector’s dolphins range to 6 nautical miles off the west coast of the South Island, but protection only extends to 2 nautical miles offshore, and then only for 3 months of the year, she says.

Several scientific organisations, including the Scientific Committee of the International Whaling Commission and the International Union for Conservation of Nature (IUCN) have recently recommended that protection be extended out to 100 metres deep in Hector’s dolphin habitats.

“Most Hector’s do not range beyond waters of this depth. Extending protection out to this mark would largely eliminate the currently unsustainable level of bycatch.”

Associate Professor Slooten says if the measure was adopted it is calculated that dolphin populations could recover to around 15,000 within 40 years.

These are currently estimated to be 7270 South Island Hector’s dolphins and as few as 55 North Island Hector’s dolphin, which is also known as Maui’s dolphin.

ENDS

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

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:

Scoop Business: Productivity Commission To Look At Housing Land Supply

The Productivity Commission is to expand on its housing affordability report with an investigation into improving land supply and development capacity, particularly in areas with strong population growth. More>>

ALSO:

Forestry: Man Charged After 2013 Death

Levin Police have arrested and charged a man with manslaughter in relation to the death of Lincoln Kidd who was killed during a tree felling operation on 19 December 2013. More>>

ALSO:

Smells Like Justice: Dairy Company Fined Over Odour

Dairy company fined over odour Dairy supply company Open Country Dairy Limited has been convicted and fined more than $35,000 for discharging objectionable odour from its Waharoa factory at the time of last year’s ”spring flush” when milk supply was high. More>>

Scoop Business: Dairy Product Prices Decline To Lowest Since July 2012

Dairy product prices dropped to the lowest level since July 2012 in the latest GlobalDairyTrade auction, led by a slump in rennet casein and butter milk powder. More>>

ALSO:

SOE Results: TVNZ Lifts Annual Profit 25% On Flat Ad Revenue, Quits Igloo

Television New Zealand, the state-owned broadcaster, lifted annual profit 25 percent, ahead of forecast and despite a dip in advertising revenue, while quitting its stake in the pay-TV Igloo joint venture with Sky Network Television. More>>

ALSO:

Get More From Scoop

 
 
Computer Power Plus

Standards New Zealand

Standards New Zealand
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news