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


Green sea urchin, Strongylocentrotus droebachiensis. (Photo Credit: Hannah Robinson)

Ocean acidification impairs digestion in marine organisms

Click on the flag for more information about Germany GERMANY
Monday, December 02, 2013, 03:50 (GMT + 9)

Studies of the larval stage of green sea urchins (Strongylocentrotus droebachiensis) carried out by researchers from Sweden and Germany show that the animals have problems digesting food in acidified water. This findings prove that ocean acidification impairs digestion in marine organisms, the team claims.

Carbon dioxide (CO2) emissions do not only affect the climate but also our seas and oceans. One-quarter of all CO2 released into the atmosphere is absorbed by the oceans. Once there, the CO2 is converted to carbonic acid, making the water more acidic. Previous studies showed that marine species and ecosystems can suffer in an acidified environment.

Although the reason for the sensitivity was seen in physiological processes, mechanisms remained unclear.

Scientists from the universities of Gothenburg (GU) and Kiel (CAU), as well as GEOMAR Helmholtz Centre for Ocean Research Kiel and Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) found that ocean acidification leads to reduced rates of digestion in larvae of the ecologically important green sea urchin Strongylocentrotus droebachiensis. The findings are published in the international journal Nature Climate Change.

Dr. Meike Stumpp, former PhD student at GEOMAR and Kiel University and first author of the study, used novel pH micro-electrode techniques and designed new assay methods during her postdoc at the University of Gothenburg to investigate digestion and digestive enzymes in the larvae. She showed that when larvae are exposed to acidified seawater, the digestion takes longer and is less effective.

“My measurements demonstrated a very strong pH dependency”, Stumpp explains. “The enzymes in the sea urchins’ stomachs are optimized to function at very high pH – which is different from the situation in mammals, where stomach pH is acidic and enzymes work best at low pH.”

Exposed to simulated ocean acidification, the larvae work hard to maintain the high stomach pH values. “The energetic demands to maintain the stomach pH increase’, says Dr. Marian Hu, co-first author of the study. Using antibody staining techniques, Hu discovered a high concentration of pH regulatory cells that cover the inner surface of the stomach. Such cells typically consume a lot of energy. Culturing experiments and feeding trials revealed that in order to compensate for the decreased efficiency of digestion, the larvae feed more.

“While earlier studies mainly focused on understanding calcification under acidified conditions, other vital processes, such as digestion and gastric pH regulation, were neglected”, says Meike Stumpp. “We can now demonstrate that they deserve much more attention.” “All living processes are run or controlled by enzymes. They are the key in understanding the functions and reactions of organisms, and finally ecosystems, in a changing world”, AWI-scientist Dr. Reinhard Saborowski adds.

“If the organisms are unable to compensate for extra costs caused by ocean acidification, by eating more, they suffer negative consequences in the form of reduced growth and fertility and in extreme cases death”, Dr. Sam Dupont points out. The researcher from the University of Gothenburg is senior author of the study.

The researchers in Germany and Sweden have spent several years developing their techniques. “Studying digestion in larvae is not easy since they are only about a fifth of a millimeter in length”, Dupont admits. "But now we are able to analyze this important process and get an impression of how sea urchin larvae might react to future living conditions." 

Source: Helmholtz Centre for Ocean Research Kiel (GEOMAR)


[email protected]
www.fis.com


 Print


Click to know how to advertise in FIS
MORE NEWS
Australia
Feb 25, 04:40 (GMT + 9):
IN BRIEF - Why does aquaculture matter in NSW?
Australia
Feb 25, 04:40 (GMT + 9):
IN BRIEF - Huon Aquaculture ‘not surprised’ Tassal sided with State Government on Macquarie Harbour fish farm
Norway
Feb 25, 04:00 (GMT + 9):
IN BRIEF - Marine Harvest completes the purchase of farming assets on the East Coast of Canada
Australia
Feb 25, 04:00 (GMT + 9):
IN BRIEF - Ocean Grown Abalone proposes trial near Port Lincoln
United States
Feb 25, 04:00 (GMT + 9):
IN BRIEF Environmental and fishing groups sue to save salmon
China
Feb 25, 04:00 (GMT + 9):
IN BRIEF - Is China’s Hands-Off Approach to Fisheries Producing More Fish?
United States
Feb 25, 04:00 (GMT + 9):
IN BRIEF - Council says ‘yes’ to fish tax, winter crab fishery
China
Feb 25, 01:50 (GMT + 9):
BioMar joint venture opens line of extruded feed
Viet Nam
Feb 25, 01:10 (GMT + 9):
Shrimp industry struggles to achieve ambitious export target
Spain
Feb 24, 23:50 (GMT + 9):
Cepesca questions 'laundering of illegal catches' in swordfish distribution
Norway
Feb 24, 23:00 (GMT + 9):
IN BRIEF - Marine Harvest ASA: Adjustment To Conversion Price Of Convertible Bond (ISIN NO0010710395)
Canada
Feb 24, 23:00 (GMT + 9):
IN BRIEF - Marine Harvest completes the purchase of farming assets on the East Coast of Canada
Spain
Feb 24, 22:50 (GMT + 9):
EU assigned 71pc of TAC for Mediterranean swordfish
Chile
Feb 24, 22:00 (GMT + 9):
Strengthened measures for transporting salmon
Spain
Feb 24, 21:50 (GMT + 9):
Galicia allocates EUR 8 million to promote sustainable aquaculture



Lenguaje
FEATURED EVENTS
  
TOP STORIES
EP Fisheries Commission visits Anfaco-Cecopesca
Spain Anfaco-Cecopesca was visited by a delegation of the EP's Fisheries Committee, led by its Vice-President, Werner Kuhn, of the European People's Party.
Thai Union records higher sales, despite difficult environment
Thailand Thai Union Group reported that its revenue grew by 7.3 per cent in 2016, driven by an adjustment of its prices and the acquisitions of Rügen Fisch and Chez Nous.
SNI asks to expand anchovy fishing zone for DHC in Tacna
Peru The National Industry Society has asked the Ministry of Production to expand the area in which small-scale purse seiners are authorized to catch anchovy in Tacna, due to problems of supply of this resource.
Half of 'suspicious' transhipments occur in Russian waters, a report says
Indonesia Fish transshipping at sea can mask illegal fishing practices and hide human rights abuses, stated Oceana in a report released at the Economist’s World Ocean Summit in Bali, Indonesia.
 
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 - 2017 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER