Welcome to FIS   Sponsored By
United States
Subscribe to FIS | Register with FIS | Advertise with FIS | Newsletter | About FIS | Contact us
   


Shells of marine snails, known as pteropods, living in the seas around Antarctica. (Photo: Russ Hopcroft, UAF/NOAA)

Ocean acidification already taking its toll on Antarctic marine snails

Click on the flag for more information about United Kingdom UNITED KINGDOM
Tuesday, November 27, 2012, 23:20 (GMT + 9)

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 tiny 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 (WHOI) 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.

Lead author, Dr Nina Bednaršek, formerly of BAS and UEA, and now of 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."

Seawater carbonate chemistry (Photo: NOAA)

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. […] 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."

Related article:

-
Improving shellfish reaction estimates to ocean acidification

editorial@fis.com
www.fis.com


 Print


Click to know how to advertise in FIS
MORE NEWS
United Kingdom
Nov 28, 06:20 (GMT + 9):
IN BRIEF - Fish producers urge EU member states to demand more flexibility on quotas
United States
Nov 28, 06:20 (GMT + 9):
IN BRIEF - Know Your Supplier: FDA Refusing Record Amounts of Shrimp Contaminated with Banned Antibiotics
Solomon Islands
Nov 28, 06:00 (GMT + 9):
IN BRIEF - Improved FAD management will protect tuna and sharks

France
Nov 28, 05:00 (GMT + 9):
IN BRIEF - French retail giant Carrefour sponsors producers' organisation for assessment of its sole fishery
United Kingdom
Nov 28, 04:10 (GMT + 9):
Iglo Group increases sales despite ‘challenging’ market
Peru
Nov 28, 03:40 (GMT + 9):
Artisanal and small scale squid fishery to be strengthened
Argentina
Nov 28, 03:00 (GMT + 9):
Golden kingklip is still in 'danger zone'
Australia
Nov 28, 02:10 (GMT + 9):
Management plan fosters sustainable growth of lock lobster fishery
Sri Lanka
Nov 28, 01:00 (GMT + 9):
Russia gives the green light to Sri Lankan seafood exporters
United States
Nov 27, 23:50 (GMT + 9):
Experts assess eel aquaculture development
Chile
Nov 27, 23:40 (GMT + 9):
Blumar records strong growth in third quarter
United States
Nov 27, 23:10 (GMT + 9):
Mote Marine Laboratory sells sturgeon and caviar business
Peru
Nov 27, 22:10 (GMT + 9):
Moderate fish landing growth in September
United Kingdom
Nov 27, 04:00 (GMT + 9):
Scottish Salmon Company achieves strong performance in 'challenging' Q3
Spain
Nov 27, 03:10 (GMT + 9):
Bluefin tuna trade fraud warned



Lenguaje
FEATURED EVENTS
  
TOP STORIES
New shrimp species discovered in South African waters
South Africa Researchers from the University of Cape Town have identified a tiny shrimp specimen with banded, stalked eyes, and gaudy red 'warning' colouring in South African waters.
QR code created to enhance seafood traceability
Australia Non-for-profit entity driving sustainability in the local seafood industry OceanWatch Australia has devised a unique QR code for fresh seafood in an attempt to boost traceability.
Fisheries-aquaculture cooperation issues with China agreed
Argentina Argentine and Chinese officials met in Beijing to address issues related to training in aquaculture, the resolution of authorizing additives use, fishmeal exports and new investments in the fisheries-aquaculture sector.
Colombia, Peru and Chile agree to strengthen fisheries monitoring
Peru Peru, Colombia and Chile have agreed to strengthen their fishing supervision as part of a regional effort to combat illegal fishing and crimes affecting fisheries and aquaculture.
 
Maruha Nichiro Corporation
Nichirei Corporation -Headquarter-
Pesquera El Golfo S.A.
Ventisqueros - Productos del Mar Ventisqueros S.A
Wärtsilä Corporation -Wartsila Group Headquarter-
ITOCHU Corporation -Headquarter-
BAADER - Nordischer Maschinenbau Rud. Baader GmbH (Head Office)
Inmarsat plc - Global Headquarters
Marks & Spencer
Tesco PLC (Supermarket) - Headquarters
Pescanova, S.A. - Group Headquarters
Sea Harvest Corporation (PTY) Ltd.
I&J - Irvin & Johnson Limited
Blue Continent Products (Pty) Ltd - (Oceana Group Limited)
Pesquera San Jose S.A.
Nutreco N.V. - Head Office
CNFC China National Fisheries Corporation - Group Headquarters
W. van der Zwan & Zn. B.V.
SMMI - Sunderland Marine Mutual Insurance Co., Ltd. - Headquarters
Icicle Seafoods Inc. -Headquarter-
Starkist Seafood Co. - Headquearters
Trident Seafoods Corp.
American Seafoods Group LLC - Head Office
Marel ehf - Group Headquarters
SalMar ASA - Group Headquarters
Sajo Industries Co., Ltd
Hansung Enterprise Co.,Ltd.
BIM - Irish Sea Fisheries Board (An Bord Iascaigh Mhara)
CEFAS - Centre for Environment, Fisheries & Aquaculture Science
COPEINCA ASA - Corporacion Pesquera Inca S.A.C.
Chun Cheng Fishery Enterprise Pte Ltd.
Food Project (Siam) Co., Ltd.
VASEP - Vietnam Association of Seafood Exporters & Producers
Gomes da Costa
Furuno Electric Co., Ltd. (Headquarters)
NISSUI - Nippon Suisan Kaisha, Ltd. - Group Headquarters
FAO -Food and Agriculture Organization- Fisheries and Aquaculture Department (Headquarter)
Hagoromo Foods Co., Ltd.
Koden Electronics Co., Ltd. (Headquarters)
A.P. Møller - Maersk A/S - Headquarters
BVQI - Bureau Veritas Quality International (Head Office)
UPS - United Parcel Service, Inc. - Headquarters
Hamburg Süd Group - (Headquearters)
Armadora Pereira S.A. - Group Headquarters
NOAA - National Oceanic and Atmospheric Administration (Headquarters)
Omega Protein Corporation -Headquarter-
Grupo Calvo - Luis Calvo Sanz, S.A. (Group Headquarter)
Marona S.A.
Marine Harvest ASA - Headquarters
Marubeni Europe Plc -UK-
Findus Ltd
Icom Inc. (Headquarter)
WWF Centroamerica
Oceana Group Limited
The David and Lucile Packard Foundation
Ajinomoto Co., Inc. -Headquarter-
Friosur S.A. - Headquarters
Cargill, Incorporated - Global Headquarters
Benihana Inc.
Leardini Pescados Ltda
Mitsubishi Corporation Marine Products Depts. D.Team
CJ Corporation  -Holding Headquarter-
Greenpeace International - The Netherlands
David Suzuki Foundation
Fisheries and Oceans Canada -Communications Branch-
Mitsui & Co.,Ltd - Headquarters
Ocean Trawlers Group - Ocean Trawlers HK Ltd.
Natori Co., Ltd.
Carrefour Supermarket - Headquarters
FedEx Corporation -Headquarter-
AKBM - Aker BioMarine ASA
Seafood Choices Alliance -Headquarter-
Austevoll Seafood ASA
Walmart / Wal-Mart Stores, Inc. (Supermarket) -Headquarter-
New Japan Radio Co.Ltd (JRC) -Head Office-
Gulfstream JSC
INVE Group - Head Office
Marine Stewardship Council - MSC Worldwide Headquarters
Royal Dutch Shell plc (Headquarter)
Genki Sushi Co.,Ltd -Headquarter-
Iceland Pelagic ehf
AXA Assistance Argentina S.A.
Caterpillar Inc. - Headquarters
Tiger Brands Limited
Morpol ASA - Group Headquarters
SeaChoice
National Geographic Society
AmazonFresh, LLC - AmazonFresh

Copyright 1995 - 2014 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER