>
 
FishingBoating-World.com
 
 
News Home Newsletters Photo Gallery Powerboat-World Australian Cruising World Cruising MarineBusiness-World Animated Knots
Video Gallery MarineBusiness-World
Sail-World.com : Marine snails being dissolved by ocean acidification
Marine snails being dissolved by ocean acidification

'The pteropod (marine snail) Limacina helicina antarctica which is abundant member of the Southern Ocean zooplankton community. Specimens mainly inhabit the top 200 m of oceanic waters where they graze on phytoplankton and detritus. Their shells are made of aragonite, a form of calcium carbonate that can dissolve rapidly.'    Nina Bednarsek

The shells of marine snails – known as pteropods – living in the seas around Antarctica are being dissolved by ocean acidification according to a new study published this week in the journal Nature Geoscience. These very small animals are a valuable food source for fish and birds and play an important role in the oceanic carbon cycle*.

During a science cruise in 2008, researchers from British Antarctic Survey (BAS) and the University of East Anglia (UEA), in collaboration with colleagues from the US Woods Hole Oceanographic Institution and the National Oceanic and Atmospheric Administration (NOAA), discovered severe dissolution of the shells of living pteropods in Southern Ocean waters.

The team examined an area of upwelling, where winds cause cold water to be pushed upwards from the deep to the surface of the ocean. Upwelled water is usually more corrosive to a particular type of calcium carbonate (aragonite) that pteropods use to build their shells. The team found that as a result of the additional influence of ocean acidification, this corrosive water severely dissolved the shells of pteropods.

Ocean acidification is caused by the uptake of carbon dioxide from the atmosphere emitted as a result of fossil fuel burning. A number of laboratory experiments have demonstrated the potential effect of ocean acidification on marine organisms. However, to date, there has been little evidence of such impacts occurring to live specimens in their natural environment. The finding supports predictions that the impact of ocean acidification on marine ecosystems and food webs may be significant.

RRS James Clark Ross in the Bellingshausen Sea, west of the Antarctic Peninsula -  British Antarctic Survey ©  
Lead author, Dr. Nina Bednaršek, formerly of BAS and UEA, and now of the National Oceanic and Atmospheric Administration (NOAA) says:

'We know that the seawater becomes more corrosive to aragonite shells below a certain depth — called the ‘saturation horizon’ — which occurs at around 1000m depth. However, at one of our sampling sites, we discovered that this point was reached at 200m depth, through a combination of natural upwelling and ocean acidification. Marine snails – pteropods — live in this top layer of the ocean. The corrosive properties of the water caused shells of live animals to be severely dissolved and this demonstrates how vulnerable pteropods are. Ocean acidification, resulting from the addition of human-induced carbon dioxide, contributed to this dissolution. '

Co-author and science cruise leader, Dr. Geraint Tarling from BAS, says:

'Although the upwelling sites are natural phenomena that occur throughout the Southern Ocean, instances where they bring the ‘saturation horizon’ above 200m will become more frequent as ocean acidification intensifies in the coming years. As one of only a few oceanic creatures that build their shells out of aragonite in the Polar Regions, pteropods are an important food source for fish and birds as well as a good indicator of ecosystem health. The tiny snails do not necessarily die as a result of their shells dissolving, however it may increase their vulnerability to predation and infection consequently having an impact to other parts of the food web.'

Co-author, Dr. Dorothee Bakker from the University of East Anglia, says:

'Climate models project a continued intensification in Southern Ocean winds throughout the 21st century if atmospheric carbon dioxide continues to increase. In turn, this will increase wind-driven upwelling and potentially make instances of deep water — which is under-saturated in aragonite – penetrating into the upper ocean more frequent. Current predictions are for the ‘saturation horizon’ for aragonite to reach the upper surface layers of the Southern Ocean by 2050 in winter and by 2100 year round. '

This research was funded by the UK Natural Environment Research Council (NERC) and the European Union Marie Curie Early Stage Training Network.

*Carbon cycle - the method by which carbon is absorbed and released by the ocean.

Upwelling: An oceanographic phenomenon that involves wind-driven motion of cooler, and usually nutrient-rich water towards the ocean surface, replacing the warmer, usually nutrient-depleted surface water.

Aragonite is a crystal form of calcium carbonate that can dissolve rapidly when its saturation in seawater falls below a threshold level. Aragonite saturation generally decreases with depth and the threshold level where dissolution occurs, called the ‘saturation horizon’, is usually reached at around 1000m depth. Ocean acidification has caused this horizon to shallow in modern times. It has been predicted that the saturation horizon may reach the surface across much of the Southern Ocean by 2100.

The pteropod-snail (Limacina helicina antarctica) – is the size of a pinhead (1cm), lives to depths of 200m, and is an abundant species in Southern Ocean waters.

Polar Regions are where ocean acidification effects are most likely to be seen first, since their colder temperatures mean a large susceptibility of the aragonite saturation to the absorption of anthropogenic carbon dioxide.

British Antarctic Survey website


by British Antarctic Survey

  

Click on the FB Like link to post this story to your FB wall

http://www.fishingboating-world.com/index.cfm?nid=104167

7:24 PM Tue 27 Nov 2012GMT


Click here for printer friendly version
Click here to send us feedback or comments about this story.







FishingBoating-World

Next week the Walmart FLW Tour will kick off the 2015 season in Florida on historic Lake Toho. Seven years have passed since the Tour last visited Lake Toho, also known as the Kissimmee Chain of Lakes. In terms of a bass fishery, the whole system dances to the beat of its own drum. ... [more]  

Perfect weather conditions over the weekend of February 7 & eighth saw nearly 150 entries in the 2015 Inaugural Port Stephens Family Fishing Competition, sponsored by Soldiers Point Marina, Pantaenius Sail and Motor Yacht Insurance and Ibis Styles Salamander Shores. ... [more]  

New WA home for BRIG by Sirocco Marine
South Fremantle is now home to a new BRIG headquarters, the only authorised BRIG agent in Western Australia. ... [more]  

The Governor of NSW David Hurley is to be the patron of the new Rotary NSW Emergency Services Community Awards which will be launched on Wednesday, March 4, at Government House, Sydney ... [more]  

Rio de Janeiro's state environmental agency says it is investigating a fish die-off that has left thousands of carcasses floating in waters where sailing events are to be held when Brazil hosts next year's Olympics. ... [more]  

Twelve people on board a charter fishing boat near Broughton Island at Port Stephens had an early end to an expected day out fishing when mechanical problems stopped the 10m vessel. ... [more]  

2015 Aquece Rio International Sailing Regatta – The Notice of Race, the Olympic Test Event, has been published. The Aquece Rio – International Sailing Regatta 2015 is the second of two Rio 2016 Olympic Test Events with the first being held in 2014. Rio will welcome sailors once again from 13-22 August 2015 with racing taking place inside and outside of Guanabara Bay. ... [more]  

The National Marine Manufacturers Association (NMMA) and Boating Writers International (BWI) announced today winners of the 2015 Progressive Insurance Miami International Boat Show Innovation Awards, presented during the annual Industry Breakfast at the Miami Beach Convention Center. ... [more]  

A 59 year-old Bentleigh man will be charged with the use and possession of prohibited mesh nets, as well as taking undersize bream from the Maribyrnong River earlier this week. ... [more]  

Roads and Maritime Services expand live vision of conditions by Transport Roads and Maritime Services
Boaters now have access to live vision of conditions at more locations with an expanded network of 18 cameras in key coastal areas and one alpine waterway in NSW. ... [more]  

High seas weather warning for Metarea 10 issued by the Australian Bureau of Meteorology Tropical Cyclone Warning Centre Brisbane at 0907 UTC 19 February 2015. Hurricane force wind warning for North Eastern Area. ... [more]  

Pacific Sky Power is launching the Kite Controller, a redesigned reel-bar with a compression winch that maintains equal line lengths throughout the launch and retrieval. For kayaks and canoes, this system enables sailing with a kite. ... [more]  

On a day that a television boating identity advised boaties to ‘give it a miss’, Australian Master Marine seized the opportunity of threatening skies, plenty of wind, swell and whitecaps to conduct sea trials on the first two new boats in its small plate alloy range. ... [more]  

This is an in-water trial set-up, which will involve The Albert Park Yachting and Angling Club (APYAC) assisting Fisheries Victoria and University of Melbourne to load and deploy locally sourced limestone rubble and other materials etc. onto to the seabed ... [more]  

Anglers of all abilities will be treated to the latest and greatest in leading-edge lures when the Yamaha Super Tank captivates audiences at the Gold Coast International Marine Expo (21-24 May 2015). ... [more]  

Information provided to the 13 FISH reporting line has led to two men being questioned by Fisheries Victoria for allegedly taking a large numbers of abalone, urchins and periwinkles near Portarlington. ... [more]  

A striking new exhibition of elegant images exposing the inner workings of fish from the Smithsonian’s National Museum of Natural History will open at the Australian National Maritime Museum this February. ... [more]  

The Maritime Management Centre in NSW is calling on members of the boating public to have their say on a draft paper reviewing lifejacket safety standards in Australia. ... [more]  

A 56-year-old Stawell man caught fishing without a licence at Peterborough last year has pleaded guilty to multiple offences, including possessing unauthorised commercial fishing equipment. ... [more]  

For the 2015 Sanctuary Cove International Boat Show some of the marine industry’s biggest names have already signed up. In fact, bookings are on par with this time last year – where 307 exhibitors turned out – which bodes well for another bumper event. ... [more]  

A Sunshine Coast driver has had that horrible sinking feeling after his car went under water at a local boat ramp. ... [more]  

NOAA Fisheries has released its 2015 Biennial Report to Congress highlighting U.S. findings and analyses of foreign illegal, unreported, and unregulated (IUU) fishing activities and of bycatch of protected species and shark catch on the high seas for foreign fleets. ... [more]  

The Australian Maritime Safety Authority (AMSA) is urging owners of emergency beacons to dispose of their unwanted beacons correctly. ... [more]  

To improve fishing opportunities for recreational anglers, more than 100,000 estuary perch fingerlings have been stocked into seven lakes and rivers across Victoria, including three new waterways never before stocked with the species. Fisheries Victoria are actively reviewing other waters across Victoria to rebuild Estuary Perch populations. ... [more]  

Most of the seafood Americans eat comes from abroad. And a lot of that is caught illegally — by vessels that ignore catch limits, or that fish in areas off-limits to fishing. ... [more]  

The Association of Collegiate Anglers (ACA) announces that Boat Owners Association of The United States (BoatUS) has renewed its title sponsorship of the 2015 Collegiate Bass Fishing Series Championship. Now in its 10th Anniversary year, the event will be held May 20-22 on Pickwick Lake in Florence, Alabama. ... [more]  

New bipartisan legislation introduced today would help ensure recreational boaters don’t put unsafe fuel in their boats, according to Boat Owners Association of The United States (BoatUS). Rep. Bob Goodlatte (R-VA), with 30 co-sponsors introduced the Renewable Fuel Standard Reform Act of 2015. BoatUS is urging all boaters to contact their US Representative to support the bill. ... [more]  

New bipartisan legislation introduced today would help ensure recreational boaters don’t put unsafe fuel in their boats, according to Boat Owners Association of The United States (BoatUS). Rep. Bob Goodlatte (R-VA), with 30 co-sponsors introduced the Renewable Fuel Standard Reform Act of 2015. BoatUS is urging all boaters to contact their US Representative to support the bill. ... [more]  

Last Thursday a rare and very unusual shark was caught by fishermen trawling off Green Cape, south of Eden on the NSW south coast. ... [more]  

Conservationist and world acclaimed marine wildlife artist Dr. Guy Harvey is bringing his newest documentary Panama Paradise, A Guy Harvey Expedition to the Miami International Boat Show’s Big Game Room for a South Florida premier showing. ... [more]  

Celebrating its 30th anniversary in 2015, Club Marine Magazine is launching its Birthday Bonanza promotion with one great destination package being won each edition of the magazine, beginning with a Fijian fishing experience for its February/March edition. ... [more]  

Boaters are reminded to keep clear of a section of Cudgen Creek next weekend for the safe staging of a triathlon. ... [more]  

A call to the 13 FISH offence reporting line recently helped Fisheries Victoria officers detect two Melbourne men aged 24 and 27 allegedly with undersize snapper at St Helens, north of Geelong. ... [more]  

60,000 fish swim into healthier Wimmera River
Abalone thieves to be charged over illegal haul
Undersized fish seized on the Glenelg River at Nelson
Better access for Great Ocean Road rock fishers
Rarely sighted frilled shark turns up in Victorian waters
Keep Australia Fishing - Queensland’s recreational fisheries
Solarshield by Oceanair: Antiglare roller blind for Marine use
Superior SuperElite ends Townsville ramp rage
2014 warmest year since records began + Video
New Torquay Reef a boost for local jobs and local fishing
A life jacket made to display on a wall
Sea, road and air? Abell Point Marina has you covered
AMM takes small plate boats upmarket into ‘Sea Class’
Wahoo Smackdown VI Tournament - Marine artists are onboard
Go on a submarine adventure in a special family fun day at the museum
Go on undersea adventure in theatre show at National Maritime Museum
Sail-World.com - Contributors Guidelines *Feature
Marine Rescue Kioloa and Ulladulla vessels investigate flare sighting
Two men and 4-year-old missing on fishing trip off Jervis Bay
Summer reminder about yabby fishing rules
Wish a Marine Rescue NSW volunteer a happy New Year on Sydney Harbour   
Stop thief! Spies nab Spy thieves   
Stop thief! Spies nab Spy thieves   
Marine Rescue Batemans Bay brings two home safe on Christmas Eve   
Learn to make personal watercraft safety a priority this summer   
2015 Victorian Recreational Fishing Guide is now available   
2015 Lakefest Aquatic Week - A week-long celebration of boating   
Seven tips to get more out of a marine survey   
Marine Auctions raises the bar with live internet bidding for auctions   
You are what you eat – if you’re a coral reef fish   
Keep safe on the water this holiday season   
Sail-World new format - Important first visit changes needed   
Four new 'Fish Friendly Marina' accreditations announced   
Another successful auction year comes to a close at Runaway Bay Marina   
Marine Auctions is proud to announce the return of Bill Fankhauser   
Go on an underwater adventure this summer at the museum   
2014 Sanctuary Classic winners announced   
AMA raises concerns about banning small cottage based fishermen   
Club Marine's all-new TeleClaims and Online Claims   
Introduction of NSW's first combined car and boat licence   


For this week's complete news stories select    Last 7 Days
   Search All News
For last month's complete news stories select    Last 30 Days
   Archive News







Sail-World.com  


















Switch Default Region to:

Social Media

Asia

Australia

Canada

Europe

New Zealand

United Kingdom


http://www.sail-world.com/event_images/image/Twitter_logo_small.png http://www.sail-world.com/event_images/image/FaceBook-icon.png  http://www.sail-world.com/event_images/image/RSS-Icon.png

United States

Cruising Northern

Cruising Southern

MarineBusiness World

PowerBoat World

FishingBoating World

 

Contact

Commercial

News

Search

Contact Us

Advertisers Information

Submit news/events

Search Stories/Text

Feedback

Advertisers Directory

Newsletter Archive

Photo Gallery

 

Banner Advertising Details

Newsletter Subscribe

Video Gallery

Policies

 

 

 

Privacy Policy

 

 


Cookie Policy

 

 



This site and its contents are © Copyright TetraMedia and/or the original author, photographer etc. All Rights Reserved.  Photographs are copyright by law.  If you wish to use or buy a photograph contact the photographer directly.
XLXL WAS FBW
LocalAds   DE  ES  FR  IT