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


Cyclopoid copepod. (Photo: School of Forest Resources & Conservation)

Viruses affect copepod populations: study

Click on the flag for more information about United Kingdom UNITED KINGDOM
Friday, January 18, 2013, 05:20 (GMT + 9)

A new study provides unprecedented evidence of viral infections in copepods, or tiny marine crustaceans. 

Viruses could account for part of the up to 35 per cent of the zooplankton's mortalities, whose causes are currently unknown but suspected to be harmful algae, environmental stressors, parasites and diseases. Researchers used genomic techniques to support the hypothesis that viral infections are a major cause of copepod deaths.

The study was published in the Proceedings of the National Academies of Science.

"This is the first evidence of viruses in marine zooplankton," said Ian Hewson, Cornell University assistant professor of microbiology and senior author of the paper. 

Copepods are critical in oceanic food webs and ocean carbon cycling, which helps regulate the Earth's climate. They also consume most of the oceans’ phytoplankton, which seize about half of the carbon dioxide pulled from the atmosphere and fixed in plant cells. 

As copepods defecate phytoplankton in the form of pellets that sink to the ocean floor, they help block atmospheric carbon there for thousands of years, mitigating climate change. Such information is useful to researchers who work with computer models to climate change in relation to population dynamics and food webs.

"We now have identified another aspect of the microbial food web that affects the amount of atmospheric carbon that potentially gets fixed," Hewson said. 

The team used microscopic and molecular techniques to track viral infections in the natural populations of two common types of copepods, Acartia tonsa, a herbivore commonly raised for fish meal, and Labidocera aestiva, a large omnivore crucial to estuary ecosystems.

Using a genomic technique, the team was able to remove viruses found in copepod tissues, sheared their DNA and identified known viral DNA sequences. In this way, they indentified two previously undocumented viruses, each unique to one of the two copepod species, that belong to the Circovirus group, previously only seen in pigs, birds and flying insects. 

According to the study, infection rates varied by population and season, with average viral loads of hundreds of thousands of viruses per copepod and 100 per cent of some L. aestiva groups infected. These preliminary findings suggest that the virus that infects L. tonsa may emerge in the spring and autumn and dissipate in the summer and winter along with the growth and reduction of copepod populations.

Using electron microscopy, the researchers checked that these viruses were not associated with gut parasites that may carry them.

Future studies will evaluate the viruses' pathology and copepods mortality rates, as well as routes of infection and ecological effects.

The study was funded by the National Science Foundation.

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


 Print


Click to know how to advertise in FIS
MORE NEWS
Spain
Oct 24, 23:50 (GMT + 9):
Spain calls for increased bluefin tuna TAC for EU fleet
Chile
Oct 24, 23:20 (GMT + 9):
Ager acquires PescaChile assets, sets trade agreement with Europacífico
Chile
Oct 24, 23:10 (GMT + 9):
Global Salmon Initiative launches first progress report
India
Oct 24, 22:40 (GMT + 9):
IN BRIEF - India's first fish hospital to come up in Kolkata
South Africa
Oct 24, 22:40 (GMT + 9):
IN BRIEF - Pirates threaten fishing industry
United States
Oct 24, 22:40 (GMT + 9):
IN BRIEF - City faces 'direct hit' in fish losses
Argentina
Oct 24, 22:40 (GMT + 9):
Anchovy and cartilaginous fish management measures defined in Argentine-Uruguay zone
Iceland
Oct 24, 22:30 (GMT + 9):
IN BRIEF - Negotiations on the sale of shares in Stofnfiskur hf.
Australia
Oct 24, 22:30 (GMT + 9):
IN BRIEF - Spencer Gulf prawn fleet helps a new management plan to protect the industry into the future
Canada
Oct 24, 22:20 (GMT + 9):
Top marine scientists call for action on 'invisible' fisheries
Norway
Oct 24, 22:00 (GMT + 9):
IN BRIEF - HAVFISK :Financial calendar for 2015
Norway
Oct 24, 21:50 (GMT + 9):
Salmon price status at week 43
American Samoa
Oct 24, 04:00 (GMT + 9):
Kiribati's decision worries local and American tuna entrepreneurs
Spain
Oct 24, 03:10 (GMT + 9):
France has doubts about Galician mussel
Chile
Oct 24, 02:30 (GMT + 9):
Marine Harvest records increased harvest and operating income



Lenguaje
FEATURED EVENTS
  
TOP STORIES
DiCaprio Foundation donates USD 2 million to combat overfishing, ocean conservation
United States The Leonardo DiCaprio Foundation provided USD 2 million to Oceans 5, an international funders’ collaborative dedicated to stopping overfishing and establishing marine reserves in the world’s five oceans.
Large scale commercial fisheries restricted in Beaufort Sea
Canada The federal government announced a new Arctic fisheries management that will protect a large area of Canada's Beaufort Sea from large-scale commercial fishing and ensure a sustainable resource for local communities.
Shipowners require 'level playing field' for all fleets fishing for sharks
Spain Two organizations of the fishing longlining sector ascribed to the Cooperative of Shipowners of the Port of Vigo demand that Spain and other Member States must require the EC to promote non-shark finning regulations.
Antarctic ecosystem protection hindered by nations’ tensions
Worldwide Efforts to protect marine ecosystem Antarctica’s Ross Sea could be hindered by tensions between some Antarctic nations, according to the secretary of the Commission for the Conservation of Antarctic Marine Living Resources.
 
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