>
 
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

Marine Rescue Middle Harbour Unit Commander Peter Nott said thieves had stolen the motor from a 3.9m aluminium runabout that is the centrepiece of the unit’s annual raffle, damaging the boat in the process. The raffle prize is a Quintrex 390 Explorer runabout fitted with a 9.9hp Mercury 4-stroke outboard on a registered Quintrex trailer, worth almost $9,000. ... [more]  

Researchers from the ARC Centre of Excellence for Coral Reef Studies (Coral CoE) at the University of Queensland and the Department of Agriculture Fisheries and Forestry examined thousands of newspaper articles dating back to 1870 to reveal the historic catch rates for the iconic Queensland fishery. ... [more]  

The BP oil spill saga, a fledgling US aquaculture industry and contentious red snapper management issues were some of the hot topics on tap recently at the Guy Harvey Fisheries Symposium at the University of South Florida’s St. Petersburg campus. ... [more]  

Extinction risk not the answer for reef futures by ARC Centre of Excellence Coral Reef Studies
Coral and reef fishes are not like pandas and tigers, and the extinction risks they face are much lower. Leading coral reef scientists in Australia and the USA say there needs to be a new approach to protecting the future of marine ecosystems, with a shift away from the current focus on extinction threat. ... [more]  

An auction is set to be held at Runaway Bay Marina, Gold Coast, on Saturday 22nd November. Telephone bidding is available by contacting, Jo on 0407 213 557, or email, jo@marineauctions.com.au. ... [more]  

Garmin, the global leader in satellite navigation, has announced its next generation of open-array digital radars – the GMR™ 424, 624/626 and 1224/1226 xHD2. Continuing to set the standard for open-array radars, the xHD2 series offers brand new features and capabilities that provide better precision, targeting and performance while transmitting power at four, six and 12 kilowatts respectively. ... [more]  

Garmin Ltd has announced a new line of scanning transducers designed to accommodate any calibre of mariner, from the casual cruiser to the professional angler. Supporting both the newest lines of Garmin echoMAP and GPSMAP chartplotters and multifunction displays (MFD), this full array of thru-hull and transom-mounted transducers are a valuable addition to any vessel. ... [more]  

Arvor reveals new diesel range by Arvor Boats Australia
Boat building should be both creative and technical and Arvor has always sought to push back its boundaries. This is what inspired its creators in the first place. And this is what leads us to the future. This summer Arvor Boats are delighted to announce the launch of two new models to the hugely popular and ever growing Arvor range – the 690 D and 730 D. ... [more]  

The Australian Marine Alliance (AMA) congratulated the recreational and commercial fishing sectors in NSW for standing shoulder-to-shoulder in a rally organised for outside of NSW Parliament at 1pm today. The rally was organised last week as a result of the NSW State Minister Katrina Hodgkinson tabling sweeping reforms in Parliament without an ounce of consultation. ... [more]  

With 29 boats and over 200 anglers competing, Wahoo Smackdown V, hosted by the historic Bimini Big Game Club Resort and Marina, provided heavy action this past weekend. Taking home the first place trophy—an original painting by renowned marine artist Carey Chen— and a check for heaviest wahoo caught (47.6 pounds) was Team 'Cash Out' captained by Jimmy Wickett from Broward County, Florida. ... [more]  

Rhode Island is the second most densely populated stateun the USA , and its 420 miles of coastline are crowded with homes and businesses, residents and tourists. The increasing rate of erosion and sea level rise, and the effects of coastal storms and flooding, are making the state’s coastal landscape ever smaller. ... [more]  

Garmin, the global leader in satellite navigation, has announced a new line of echoMAP combination chartplotters that integrates scanning sonar capabilities without the need of an additional sounder black box. Along with a user-friendly interface and built-in cartography, the new echoMAP series proves to be a valuable tool for boaters and anglers of all types. ... [more]  

Garmin, the global leader in satellite navigation, has announced the GSD 25, a premium sonar module that offers traditional sonar, 1kW CHIRP, CHIRP DownVü and CHIRP SideVü scanning sonar for a versatile, all-in-one black box. The GSD 25 is the ultimate solution for the boater or angler that requires both scanning capabilities and traditional sonar. ... [more]  

Applications are now open for exhibitors to secure their space at the 2015 Brisbane Tinnie and Tackle Show. The Show will provide a unique hands on experience and diverse product range to patrons when it teams up with the Explore Australia Expo and moves on the water to the Manly Harbour precinct in early March 2015. ... [more]  

Coral reef fin fish will be off limits for the second of two annual closures that protect these fish during the spawning season. Queensland Boating and Fisheries Patrol (QBFP) district manager Greg Bowness said: 'The closed season starts immediately after midnight at the beginning of 19 November and ends immediately before midnight at the end of 23 November,' Mr. Bowness said. ... [more]  

The new assets will significantly boost the emergency capability of Marine Rescue NSW volunteers on the State’s Illawarra Coast. Deputy Commissioner Storey said, 'Shellharbour 30 is a 10 metre Naiad, able to travel up to 30 nautical miles offshore and it will become an important part of Marine Rescue’s strategic search and rescue safety net of offshore vessels covering this region. ... [more]  

It’s one of those wonderful sayings you hear around the quay or bar a lot. It’s mostly spoken when someone makes an obvious and usually very public mistake. It is one of those classic, laconic and ironic statements. It is as Australian as calling people by their Surname, especially if it is shortened, or even lengthened, by adding a ‘y’, ‘o’ or ‘ie’ to the end of it. ... [more]  

2014 Yamaha Cod Classic - The time has come again to catch a famous Murray Cod at Australia’s richest freshwater fishing tournament, the most eagerly anticipated fishing social event of the year! An expected 3000 anglers and 1400 boats will take to the Murray’s Lake Mulwala in an attempt to hook the winning catch for a share of the $150,000 worth of cash and prizes. ... [more]  

Auckland Airport has chosen an innovative Rayglass ProJet to help protect its flights from the possibility of bird strike. The airport’s Rayglass ProJet, named Kaitiaki Rangi or 'Guardian of the Skies', operates around the edges of the airport’s runways, scaring away the birds, especially swans, that sometimes congregate on the nearby banks ... [more]  

The fourth annual No Motor Tournament is set to kick off Saturday, November 8th and to make this event even more fun - and potentially rewarding. ... [more]  

‘Fish Friendly Marina’ accreditation is an information campaign and accreditation system focusing on marina fish habits and was developed initially by the Marina Industries Association (MIA) and the NSW Boating Industry Association (BIA) in collaboration and consultation with government and EPA authorities. ... [more]  

The 60 tonne vessel was scuttled this morning at popular fishing spot, Harry Atkinson Reef, 7 km east-south-east of St Helena Island. The Port of Brisbane offered the boat to the Moreton Bay Marine Park Authority a few months ago. The government bought it from the Port of Brisbane for $1. ... [more]  

A sold out 'Save Our Seas' themed fundraiser held at the IGFA Fishing Hall of Fame Saturday, November 1st was a memorable night for marine wildlife artist and scientist Dr. Guy Harvey, whose foundation generated over $200,000 in revenue to fund leading-edge marine science, conservation and education. ... [more]  

Tonic releases Blue Mirror Limited Edition by Tonic Polarised Eyewear
Available in Tonic’s popular Evo and Shimmer frame styles, the Limited Edition is a stylish solution for high-glare conditions. The Blue Mirror lenses were specially developed for Australian anglers and outdoor enthusiasts, and share their high-tech optics with all of Tonic’s growing range of lightweight polarised optical glass lenses. ... [more]  

The Victorian Government has taken steps to grow the state’s sea urchin fishery by introducing a new licensing and quota system, providing fishers with more secure access and business certainty. Fisheries Victoria Executive Director Ross McGowan said the new system would give urchin fishers greater security and confidence to invest in their businesses and to develop local and overseas markets. ... [more]  

Recreational Fishers renew support for Prime Minister’s ban by Australian Recreational Fishing Foundation
The Australian Recreational Fishing Foundation (ARFF), the national body representing Australia’s recreational fishing community, today reconfirmed its support for Prime Minister Tony Abbott's ban on supertrawlers. The Prime Minister announced his ban on these industrial fishing boats in March this year. ... [more]  

Victorian Premier Denis Napthine today unveiled a $65 million Better Bay Plan and announced that commercial netting in Port Phillip Bay and Corio Bay will be phased out. Dr Napthine said the comprehensive plan focused on preserving and rehabilitating one of the state’s best assets, while also building important community infrastructure to enable more people to enjoy Port Phillip Bay. ... [more]  

Nova Southeastern University (NSU) announced that Guy Harvey and the Guy Harvey Ocean Foundation are providing a very generous financial gift that will allow students, faculty and other researchers at NSU’s Oceanographic Center to enhance their work and also provide scholarships to undergraduate and graduate students studying marine biology. ... [more]  

In the upcoming season, a recreational slot limit of 55-75cm will apply to all Murray cod caught in Victorian and NSW waters, from the opening of the Murray cod season on 1 December. Minister Walsh and Minister Hodgkinson agreed it was necessary to have consistent size limits. ... [more]  

Fishers are reminded that barramundi are off limits in Queensland east coast waters from noon 1 November 2014 until noon 1 February 2015. Queensland Boating and Fisheries Patrol district officer Robert Ibell said the closure was in place to protect barramundi stock during their spawning season. ... [more]  

Representing superlative achievement with a focus on sustainability, the awards were presented 29 October at the 24th Anniversary of ISS’s Awards Gala in Fort Lauderdale, Florida during the Fort Lauderdale International Boat Show. The Excellence in Innovation Award was accepted by David Hogan, son of Superior CEO, John and Jackie Hogan in front of an international audience. ... [more]  

2015 Sanctuary Cove International Boat Show - After a successful 2014, Mulpha Sanctuary Cove is gearing up for its 27th annual Sanctuary Cove International Boat Show, with exhibitor opportunities opening next week (November 6). ... [more]  

A brand new online classifieds website called Boat Bitz has just been launched specifically focused on helping boat owners clear their unwanted or unused boating and fishing equipment. ... [more]  

Eagle One luxury motoryacht – seeking new owner
Ten crucial actions to save the Great Barrier Reef
Henri Lloyd's famous summer sample sale on now
Where is the Deepwater Horizon oil?
Fisheries enforcement blitz targets snapper anglers
Fort Lauderdale International Boat Show - Australia among the best
Wahoo Smackdown V attracting record number of anglers
Guy Harvey Outpost launches Data Collection Fishing App
sMRT Inflatable SOS Dan Buoy selected by judges for METS Dame Awards
Girringun Ranger exercise targets illegal activities
Arrested development – sediment wreaks havoc with fish larvae
Tauranga Boat Expo - Lancer and Sea Blade attend for the first time
Safer Boating Week: New Auckland Council Navigation come into effect
NMMA loses E15 fuel U.S. Court of Appeals Decision
High profile anglers support Rec. fishing reserve for Port Phillip
Marine Rescue Iluka Yamba towing disabled fishing vessel to safety
Explore Australia Expo and Brisbane Tinnie and Tackle Show join forces
METS names DAME Award nominees
New improved swell forecasting and more locations from PredictWind
A Sailor's Dream Home: View after the Coastal Classic - Auction 22 Nov
Brisbane Tinnie and Tackle Show moving to Manly Harbour in 2015   
Partnership to encourage lifejacket use   
2014 Gold Coast International Marine Expo: Another outstanding success   
Guy Harvey Fisheries Symposium announced for November 13-15   
Safer Boating Week boosted by short, snappy, safety tips clip   
2014 Gold Coast International Marine Expo - Marine Syndication wins   
Coast Guard rescues two near Wachapreague   
2014 Gold Coast Int'l Marine Expo - McDonald’s boosts the family fun   
Sheltering habits help sharks cope with acid oceans   
Dutch boy on a mission to rid the world's oceans of floating plastic *Feature   
Discover Boating Week starts tomorrow   
Great start to another massive Gold Coast International Marine Expo   
Changed boating conditions on Sydney Harbour for Australian Boat Race   
Whale freed from net at Rainbow Beach   
2014 Gold Coast Int'l Marine Expo - One more sleep until massive event   
Boats recovery after Sydney storm   
Partnership to encourage lifejacket use   
Most boaters start the new boating season safely   
Help stop spreading of the invasive Quagga mussel   
Discover Boating Week opens up opportunities to participate   


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 NEW FBW
LocalAds   DE  ES  FR  IT