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:6/26/2016)... ... June 26, 2016 , ... Many women are ... with endometriosis. These women need a treatment plan to not only alleviate symptoms ... can help for preservation of fertility and ultimately achieving a pregnancy. The specialists ...
(Date:6/25/2016)... Aliso Viejo, California (PRWEB) , ... June 25, 2016 , ... ... preset to fit their specific project," said Christina Austin - CEO of Pixel Film ... all fully customizable and all within Final Cut Pro X . Simply select ...
(Date:6/25/2016)... ... June 25, 2016 , ... On Friday, June 10, Van Mitchell, Secretary of ... award to iHire in recognition of their exemplary accomplishments in worksite health promotion. , ... Workplace Health & Wellness Symposium at the BWI Marriott in Linthicum Heights. iHire was ...
(Date:6/24/2016)... ... June 24, 2016 , ... June 19, 2016 is ... associated with chronic pain and the benefits of holistic treatments, Serenity Recovery Center ... suffering with Sickle Cell Disease. , Sickle Cell Disease (SCD) is a disorder of ...
(Date:6/24/2016)... ... June 24, 2016 , ... Dr. Amanda ... orthodontic treatment. Dr. Cheng has extensive experience with all areas of orthodontics, including ... accelerated osteogenic orthodontics. , Micro-osteoperforation is a revolutionary adjunct to orthodontic treatment. ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... 2016 According to a new ... Pen Needles, Safety Pen Needles), Needle Length (4mm, 5mm, ... Mode of Purchase (Retail, Non-Retail) - Trends & Global ... the market for the forecast period of 2016 to ... Billion by 2021 from USD 1.65 Billion in 2016, ...
(Date:6/23/2016)... 2016 Research and Markets has announced ... Forecast to 2022" report to their offering. ... the patients with kidney failure, it replaces the function of ... patient,s blood and thus the treatment helps to keep the ... balance. Increasing number of ESRD patients & ...
(Date:6/23/2016)... , June 23, 2016 Research and ... Devices Medical Market Analysis 2016 - Forecast to 2022" ... The report contains up to date financial data derived ... Assessment of major trends with potential impact on the market ... of market segmentation which comprises of sub markets, regional and ...
Breaking Medicine Technology: