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
Kenya
Apr 25, 05:00 (GMT + 9):
IN BRIEF - Adapting to Climate Change in Kenya via Fish Farms
Australia
Apr 25, 05:00 (GMT + 9):
IN BRIEF - Value of sea cucumbers rising
Sri Lanka
Apr 25, 05:00 (GMT + 9):
IN BRIEF - Sustainable tuna management in the Indian Ocean with participation from 18 coastal states
Viet Nam
Apr 25, 05:00 (GMT + 9):
IN BRIEF - Fimex VN to become elite seafood company
China
Apr 25, 04:40 (GMT + 9):
IN BRIEF - Zhangzidao Group signs strategic agreement with Beijing Jingdong on online sales business
India
Apr 25, 04:40 (GMT + 9):
IN BRIEF - Cage culture nets a big haul of cobia
Australia
Apr 25, 04:30 (GMT + 9):
IN BRIEF - Illegal foreign fishing vessel intercepted West of Darwin
Jamaica
Apr 25, 04:30 (GMT + 9):
IN BRIEF - Caribbean conch, lobster trade under threat, officials say
Brazil
Apr 25, 04:10 (GMT + 9):
Technical cooperation with Ivory Coast agreed
Canada
Apr 25, 04:00 (GMT + 9):
IN BRIEF - Canada Taking Leadership Role to Improve International Science Around the Status of Atlantic Bluefin Tuna Stocks With Upcoming PEI Meeting
New Zealand
Apr 25, 03:10 (GMT + 9):
King Salmon develops further expansion plans
Spain
Apr 25, 02:30 (GMT + 9):
Creditor banks assume Pescanova’s rescue without Damm
Indonesia
Apr 25, 01:50 (GMT + 9):
Dutch university to cooperate in bilateral fisheries and aquaculture project
Viet Nam
Apr 25, 01:00 (GMT + 9):
IN BRIEF - Thuy Hai Seafood Processing Co., inaugurated its fishmeal factory
Bangladesh
Apr 25, 01:00 (GMT + 9):
IN BRIEF - Russia lifts ban on frozen food export from BD



Lenguaje
FEATURED EVENTS
  
TOP STORIES
Greenpeace makes strong claims at bluefin tuna auction
Taiwan Amid Greenpeace’s protests for better protection measures to be implemented for the bluefin tuna, the sale of the first landing of the species took place in the framework of the first Pingtung Bluefin Tuna Cultural Festival.
Climatic changes pose serious threats to the fishing sector
India The fisheries sector in Kerala could experience a strong impact due to climatic change, according to a report prepared by the Department of Environment and Climate Change.
Chinese market becomes an alternative to deal with invasive carp
United States The Chinese market could be the solution to free rivers and lakes in the United States from invasive carp species.
No signs of herring seen in Togiak
United States The first aerial survey of the Togiak District conducted by the Alaska Department of Fish and Game this week finished without spotting herring schools in the fishery.
 
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 International Fisheries Corp. - 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
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