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

 


Freshwater flows affect polar oceanic microbes

NIWA Media Release Scientists discover freshwater flows affect polar oceanic microbes


An international team of scientists has been studying bacteria that live in Arctic and Antarctica waters.

NIWA’s Marine Microbiologist, Els Maas says, “The polar regions often are described as being mirror images of one another so we were expecting the bacteria populations to be comparable”.

However, genetic sequencing has shown that 75 per cent of the bacteria found in the surface coastal waters are unique to either the Arctic or Antarctica. The differences are not nearly so marked in deeper waters and the scientists believe that freshwater from glaciers and streams to the Arctic and Antarctica appears to be responsible for the difference.

One of the most notable differences in environmental conditions between the two polar oceans is freshwater input. In the Antarctica, glacial meltwater accounts for most of the freshwater that flows into the systems. In contrast, the Arctic ocean receives much more freshwater from several large rivers with huge continental drainage basins, in addition to glacial meltwater.

Dr Maas says, “It’s important to study bacteria because we don’t understand much about their diversity, especially how they contribute to the food web. Bacteria are important in recycling nutrients and making these available to larger plants and animals.”

The scientists compared samples from coastal and open oceans, between winter and summer (2000-2008), to test whether or how environmental conditions and dispersal patterns shape communities in the polar oceans. Samples were processed using a DNA sequencing technique called pyrosequencing, involving more than 800,000 sequences from the 92 samples.

The New Zealand samples were collected as part of the New Zealand Government-funded IPY-CAML (International Polar Year Census of Antarctic Marine Life) research trip to the Ross Sea in 2008 on board NIWA’s research vessel Tangaroa. The NIWA samples were the southern-most samples analysed.

The collaborative research was the result of an international effort coordinated by Dr Alison Murray, Desert Research Institute, USA. It involved national polar research programs from six countries -Canada, France, New Zealand, Spain, Sweden and the United States. Support for the work also came from the Sloan Foundation's Census of Marine Life program and the International Census of Marine Microbes, which developed the approach and conducted the sequencing effort.


ENDS

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

OceanaGold: Man Killed In Waihi Mine Accident

A 29-year-old man had died following a work place accident at OceanaGold mine, Waihi last night. The man was killed after the front end loader he was in rolled down a slope. The accident happened at approximately 6.30pm on Thursday night. More>>

ALSO:

Constructing Consent: Annual Housing Consents Highest In Over A Decade

More than 29,000 new homes gained building consent in the year to June 2016, up 16 percent from the previous June year, Statistics New Zealand said today. More>>

ALSO:

War Against Weevil For Future Peas: “No Peas, No Weevil” Ban Now In Place In Wairarapa

The Ministry for Primary Industries (MPI) has today placed a ban on growing peas within a specified area and placed controls on moving pea material (seed and untreated pea straw) within, in and out of this area for the next 2 years. More>>

ALSO:

Wood Producers: Crisis In New Zealand Log Supply

New Zealand wood processing leaders held a hui with senior government officials and political leaders in Whangarei yesterday to assess the acute log supply shortage to local mills in Northland. More>>

Consents And Taxes: Trustpower 'Very Disappointed' With Judgement

Trustpower is "very disappointed" with a Supreme Court ruling dismissing its bid to claim tax deductions on $17.7 million of project costs in a case closely watched by large-scale infrastructure developers. More>>

ALSO:

Fruitful Endeavours: Kiwifruit Exports Reach Record Levels

In June 2016, kiwifruit exports rose $105 million (47 percent) from June 2015 to reach $331 million, Statistics New Zealand said today. Overall, goods exports rose $109 million (2.6 percent) in June 2016 (to $4.3 billion). More>>

ALSO:

Get More From Scoop

 
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news