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


UW-Madison professor Pupa Gilbert holding an abalone shell: mother-of-pearl. (Photo: Jeff Miller/UW-Madison)

Mother of pearl can tell ocean temperature, depth

Click on the flag for more information about United States UNITED STATES
Tuesday, May 15, 2012, 01:40 (GMT + 9)

Nacre or mother of pearl is produced by a host of mollusc species. Scientists from the University of Wisconsin-Madison have now shown that it can be used as a thermometer and pressure sensor which reveals both the temperature and ocean depth at which it formed.

"We found a strong correlation between the temperature at which nacre was deposited during the life of the mollusc and water temperature," explained Pupa Gilbert, a UW-Madison professor of physics and chemistry and the senior author of the new report published in the Journal of the American Chemical Society (JACS).

"All other (temperature) proxies are based on chemical analyses and the relative concentration of different elements or isotopes. This could be our first physical proxy, in which the microscopic structure of the material tells us the maximum temperature and maximum pressure at which the mollusc lived," Gilbert added.

If these techniques can be applied to fossil nacre, scientists can start to accurately rebuild a global record of ancient environments and environmental change.

"If the correlation holds, we would have a thermometer that goes back in time, a paleothermometer of how hot or cold water temperatures were when the nacre formed," said Gilbert.

Researchers can also use the thickness of the nacre layers -- which varies for the water depth at which the material was assembled by a mollusc -- to learn more about environmental conditions of the present and past.

"The maximum temperature can be measured by how disordered the nacre crystal orientations are, while the maximum pressure can be taken from the thickness of the nacre layers."

Along with UW-Madison graduate student Ian C Olson, Gilbert subjected nacre from eight mollusc species from different environments to a technique that can map the orientation of nacre crystals. The team observed uneven thicknesses, widths and angles of the crystalline "bricks" that, together with an organic mortar, are set by the mollusc to form mother of pearl.

"We wondered why the shells were so different and concluded that the key parameters to test were the environmental ones, including maximum, minimum and mean annual temperatures as well as maximum and minimum water pressure, which depends on water depth," said Gilbert.

The team found an extremely high correlation between the microscopic structural characteristics of their nacre samples and the temperature and pressure information obtained from the various harvesting sites.

By Natalia Real
editorial@fis.com
www.fis.com


 Print


Click to know how to advertise in FIS
MORE NEWS
Canada
Aug 31, 03:20 (GMT + 9):
High sea fishing ban could boost coastal fisheries
Germany
Aug 31, 02:40 (GMT + 9):
Ocean acidification affects Atlantic cod recruitment
Thailand
Aug 31, 01:10 (GMT + 9):
Thai Union restates its sustainability commitment given Greenpeace’s accusations
India
Aug 31, 00:40 (GMT + 9):
Foreign trawlers accused of illegal trans-shipment
Canada
Aug 31, 00:20 (GMT + 9):
IN BRIEF - Controversial fish farm footage released
Canada
Aug 31, 00:00 (GMT + 9):
IN BRIEF - NowNS: Sustainable Blue hitches on global demand for local fish
Thailand
Aug 31, 00:00 (GMT + 9):
IN BRIEF - Thai Union Awarded ESG100 from Thaipat
Myanmar
Aug 31, 00:00 (GMT + 9):
IN BRIEF - Varsity successfully breeds mangrove crabs
Iceland
Aug 31, 00:00 (GMT + 9):
IN BRIEF - New managers at HB Grandi
United States
Aug 31, 00:00 (GMT + 9):
IN BRIEF - USD 210 lobster bought from fish market, set free is found dead
Australia
Aug 31, 00:00 (GMT + 9):
IN BRIEF - Talking Point: Drag fish farm regulation into 21st century
New Zealand
Aug 31, 00:00 (GMT + 9):
IN BRIEF - Ministry defends low number of fish dumping prosecutions
United States
Aug 31, 00:00 (GMT + 9):
IN BRIEF - Global Aqua Feed Market to Reach USD 122.6 Billion by 2019 - Industry Analysis, Size, Share, Growth, Trends and Forecast 2019: TMR
Australia
Aug 31, 00:00 (GMT + 9):
IN BRIEF - Community backs tougher scrutiny of fish farms
India
Aug 31, 00:00 (GMT + 9):
IN BRIEF - Cusat to set up intensive fish farm in Kuttanad



Lenguaje
FEATURED EVENTS
  
TOP STORIES
Study predicts alarming krill drop by end of the century
United States Antarctic krill (Euphausia superba) habitat is undergoing a continuous deterioration process, which could lead to a reduction of up to 80 per cent by the end of the century.
New toxic microalgae species causing ciguatera discovered
Spain Researchers at the Spanish Institute of Oceanography have discovered a new toxic microalgae species, a dinoflagellate of the genus Gambierdiscus.
China leads worldwide seafood demand, states Japanese entrepreneur
Japan Despite China's slowing economy, the world's most populous country has an insatiable appetite for fishery products, according to Japanese seafood company Maruha Nichiro president.
Mussel sector moves frantically before red tide
Spain In recent weeks mussel landings in Galicia have strengthened, fearing that the advance of a new red tide episode can lead to massive Galician raft closure.
 
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+Co.KG (Head Office)
Inmarsat plc - Global Headquarters
Marks & Spencer
Tesco PLC (Supermarket) - Headquarters
Nueva Pescanova, S.L. - Group Headquarters
Sea Harvest Corporation (PTY) Ltd.
I&J - Irvin & Johnson Holding Company (Pty) Ltd.
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 - 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-
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 - 2016 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER