Navigation Links
Ice age imprint found on cod DNA
Date:11/13/2007

An international team of researchers, led by the University of Sheffield, has demonstrated how Atlantic cod responded to past natural climate extremes. The new research could help in determining cods vulnerability to future global warming.

With fishing pressures high and stock size low, there is already major concern over the current sustainability of cod and other fisheries. The new findings, published in the journal, Proceedings of the Royal Society B, show that natural climate change has previously reduced the range of cod to around a fifth of what it is today, but despite this, cod continued to populate both sides of the North Atlantic.

The researchers used a computer model and DNA techniques to estimate where cod could be found in the ice age, when colder temperatures and lower sea-levels caused the extinction of some populations and the isolation of others.

The computer models used to estimate ice-age habitats suitable for cod were developed by Professor Grant Bigg, Head of the University of Sheffields Department of Geography. These climatic analyses were combined with genetic studies by US researchers at Duke University and the University of California, and ecological information prepared by colleagues at the University of East Anglia and the Institute of Marine Research in Norway.

On land, plants and animals (including humans) are known to have moved further south when the northern ice sheets reached their maximum extent around 20,000 years ago. Similar migrations must have happened for plankton and fish in the sea. But there were two added complications: firstly, greatly reduced sea levels meant that many shallow and highly productive marine habitats around Europe and North America ceased to exist. Secondly, the ice-age circulation patterns in the North Atlantic caused the temperature change between tropical and polar conditions to occur over a much shorter north-south distance, reducing the area suitable for temperate species such as cod.

The new analyses included these effects, together with other environmental and ecological information, in order to estimate where it was possible for Atlantic cod to reproduce and survive.

The results indicated that the ice-age range of Atlantic cod extended as far south as northern Spain, but the total area of suitable habitat was much more restricted. Nevertheless, populations of cod continued to exist on both sides of the North Atlantic. These findings were confirmed by genetic data, based on over a thousand DNA analyses of present-day cod populations, from Canada, Greenland, Iceland and around Europe.

Professor Bigg said: This research shows that cod populations have been able to survive in periods of extreme climatic change, demonstrating a considerable resilience. However this does not necessarily mean that cod will show the same resilience to the effects of future climatic changes due to global warming.


'/>"/>

Contact: Lindsey Bird
l.bird@sheffield.ac.uk
01-142-225-338
University of Sheffield
Source:Eurekalert

Related biology news :

1. Ancient amphibians left full-body imprints
2. Key to out-of-control immune response in lung injury found
3. Natural chemical found in broccoli helps combat skin blistering disease
4. Balzan Foundation announces 2007 winners
5. Keck Foundation funds study of biological interactions with nanomaterials
6. Yu receives research funding from the Wallace H. Coulter Foundation
7. New dinosaur species found in Montana
8. PETA awards $120,000 to Duluth Foundation for advancing non-animal tests
9. New use for stem cells found in war on terrorism
10. New animal and plant species found in Vietnam
11. Three-way mating game of North American lizard found in distant European relative
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:11/24/2016)... -- Cercacor today introduced Ember TM Sport Premium ... measure hemoglobin, Oxygen Content, Oxygen Saturation, Perfusion Index, ... approximately 30 seconds. Smaller than a smartphone, using only ... key data about their bodies to help monitor these ... Hemoglobin carries oxygen to muscles. When hemoglobin and ...
(Date:11/21/2016)... , Nov. 21, 2016   Neurotechnology ... object recognition technologies, today announced that the MegaMatcher ... cards was submitted for the NIST Minutiae ... passed all the mandatory steps of the evaluation ... is a continuing test of fingerprint templates used ...
(Date:11/17/2016)... it has just released a new white paper authored by Zettar that covers the ... transfer storage solutions. Photo - http://photos.prnewswire.com/prnh/20161116/440463 ... ... ... Setting up a high performance computing or HPC system can be a complicated endeavor ...
Breaking Biology News(10 mins):
(Date:12/4/2016)... CAMBRIDGE, Mass. and ... 4, 2016 SystemOne, a company focused ... platforms for the developing world, and Daktari Diagnostics, ... reality with its portable and ultrasensitive immunoassay-based CarePlatform™, ... development and license agreement to integrate Daktari,s technology ...
(Date:12/2/2016)... Dec. 2, 2016 CytRx Corporation (NASDAQ: ... specializing in oncology, today announced the appointment of ... industry consultant, and private healthcare investor, to its Board ... leader with clinical and strategic experience at the highest ... and CEO. "As one of the world,s leading orthopedic ...
(Date:12/2/2016)... NC (PRWEB) , ... December 01, 2016 , ... ... US Computational Science Symposium (CSS) and the popularity of US Single Day Events ... take place in early Summer 2018, in Raleigh, NC. Topics of the pharmaceutical ...
(Date:12/2/2016)... ... December 02, 2016 , ... Robots will storm the Prudential Center ... 3rd, 2016. The event, which is held on the United Nations International Day of ... Disabilities back into the workplace. Suitable Technologies is partnering with NTI to showcase how ...
Breaking Biology Technology: