Navigation Links
Hibernation-like behavior in Antarctic fish -- on ice for winter
Date:3/5/2008

Scientists have discovered an Antarctic fish species that adopts a winter survival strategy similar to hibernation. Reporting this week in the journal PLoS ONE, the online journal from the Public Library of Science, scientists from British Antarctic Survey (BAS) and the University of Birmingham reveal, for the first time, that the Antarctic cod Notothenia coriiceps effectively puts itself on ice to survive the long Antarctic winter.

The study showed that the fish activate a seasonal switch in ecological strategy going from one that maximises feeding and growth in summer to another that minimises the energetic cost of living during the long, Antarctic winter. The research demonstrates that at least some fish species can enter a dormant state, similar to hibernation that is not temperature driven and presumably provides seasonal energetic benefits. Scientists already know that Antarctic fish have very low metabolic rates and blood antifreeze proteins that allow them to live in near-freezing waters. This study demonstrates that Antarctic fish - which already live in the slow lane with extremely low rates of growth, metabolism and swimming activity - can in fact further depress these metabolic processes in winter.

Lead author Dr Hamish Campbell, formerly at the University of Birmingham, UK but now at University of Queensland, Australia said,

Hibernation is a pretty complex subject. Fish are generally incapable of suppressing their metabolic rate independently of temperature. Therefore, winter dormancy in fish is typically directly proportional to decreasing water temperatures. The interesting thing about these Antarctic cod is that their metabolic rates are reduced in winter even though the seawater temperature doesnt decrease much. It seems unlikely that the small winter reductions in water temperature that do occur are causing the measured decrease in metabolism. However, there are big seasonal changes in light levels, with 24 hour light during summer followed by months of winter darkness so the decrease in light during winter may be driving the reduction in metabolic rates.

Dr Keiron Fraser from BAS says,

This is our first insight into how these fish live in winter. We have for the first time in the Antarctic, used cutting edge technologies combining tracking of free swimming fish in the wild and heart rate monitors to allow us to investigate just how these animals cope in winter with living in near freezing water and almost complete darkness for months on end. It appears they utilise the short Antarctic summers to gain sufficient energy from feeding to tide them over in winter. The hibernation-like state they enter in winter is presumably a mechanism for reducing their energy requirements to the bare minimum. The interesting question we still have to answer is why these fish greatly reduce feeding in winter when food is still available.

Why these fish chose to adopt this hibernation-like strategy during winter is currently unclear, but it presumably provides energetic benefits. The traditional views of hibernation are being challenged constantly. This study introduces a new group of animals that appear to utilise a hibernation-like strategy that allows them to survive during the long winters in one of the harshest environments on Earth.


'/>"/>

Contact: Linda Capper
L.capper@bas.ac.uk
44-012-232-21448
British Antarctic Survey
Source:Eurekalert  

Related medicine news :

1. USAID Implements Behavior Change and Social Marketing Program in Rwanda
2. Spanking Raises Chances of Risky, Deviant Sexual Behavior
3. Gene therapy trains immune system to destroy brain cancer cells and reverses behavioral deficits
4. Regions Hospital to Open New Inpatient Behavioral Health Unit
5. Children who have an active father figure have fewer psychological and behavioral problems
6. Prenatal exposure to maternal antibodies linked to autistic behaviors in offspring
7. 9/11 Exposure Linked to Behavior Trouble in Kids
8. AmeriHealth Mercy Family of Companies Acquires Community Behavioral HealthCare Network of Pennsylvania
9. Accelerated head growth can predict autism before behavioral symptoms start
10. Mental health screenings, risk behavior interventions needed in juvenile justice system
11. Transition of Behavioral Health Services from WPIC-BV to Heritage Valley Health System
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Hibernation-like behavior in Antarctic fish -- on ice for winter
(Date:6/27/2016)... ... June 27, 2016 , ... "FCPX editors can now ... of Final Cut Pro X," said Christina Austin - CEO of Pixel Film Studios. ... Final Cut Pro X users can now reveal the media of their split ...
(Date:6/27/2016)... ... June 27, 2016 , ... A revolution is ... emergency ambulance transport experience for the millions of people who require these medical ... the taxi industry through the use of technology. Now, SmartEMS has put forth ...
(Date:6/26/2016)... ... June 26, 2016 , ... On June 10-11, 2016, A ... 2016 Cereal Festival and World’s Longest Breakfast Table in Battle Creek, MI, where the ... history as home to some of the world’s leading providers of cereal and other ...
(Date:6/26/2016)... ... , ... Brent Kasmer, a legally blind and certified personal trainer is helping to develop a ... fitness app plans to fix the two major problems leading the fitness industry today:, ... type program , They don’t eliminate all the reasons people quit their exercise ...
(Date:6/25/2016)... ... , ... Austin residents seeking Mohs surgery services, can now turn to Dr. ... Russell Peckham for medical and surgical dermatology. , Dr. Dorsey brings specialization to include ... in Mohs Micrographic Surgery completed by Dr. Dorsey was under the direction of Glenn ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... 2016   Bay Area Lyme Foundation , ... Center for Tick Borne Illness , Harvard Medical ... Hacking Medicine, University of California, Berkeley, and the ... five finalists of Lyme Innovation , the ... 100 scientists, clinicians, researchers, entrepreneurs, and investors from ...
(Date:6/24/2016)... June 24, 2016 The Academy of Managed ... recommendations that would allow biopharmaceutical companies to more ... that make formulary and coverage decisions, a move that ... new medicines. The recommendations address restrictions in ... on the drug label, a prohibition that hinders decision ...
(Date:6/24/2016)... 24, 2016 Research and Markets has ... Companion Diagnostic Tests" report to their offering. ... Diagnostics The World Market for Companion Diagnostics ... diagnostics. Market analysis in the report includes the following: ... Vitro Diagnostic Kits) by Region (N. America, EU, ROW), 2015-2020 ...
Breaking Medicine Technology: