How do animals exposed to 24-hour light retain their wake-sleep habits?

ere exposed to artificial continuous light and demonstrated the Aschoff effect, where the circadian activity pattern changes quantitatively with the intensity of the light. This group took on a 26-hour day.

This was not the case when the experiment was repeated in the field at the Naval Arctic Research Laboratory - with two species of Arctic rodents exposed to continuous daylight (nocturnal porcupines [Erethizon] N=4, and hibernators, the Arctic ground squirrel [Spermophilis] N=6). Under these circumstances, both species had a specific time of sleep and of wakefulness. In fact, the Arctic rodents, which had undergone 82 days of continuous sun above the horizon, had a crisp, 24-hour day-night rhythm of sleep and wakefulness.


The free-living animals in the Arctic had regular sleep-awake cycles, despite having 82 days of continuous sun. The intriguing question is whether or not these animals have found a clue in the external environment to take the place of the missing sunset. The researchers hypothesize that because the sun during this period is nearer the horizon at one part of the day, this might act as a clue for the biological clocks.

As the American economy requires its work force to abandon traditional work hours of "nine to five," it becomes more important for us to understand how the body's biological clock can respond to unnatural light clues and adapt to a changing environment. This study is another step in the continuing research towards such comprehension.


Contact: Donna Krupa
American Physiological Society

Page: 1 2

Related biology news :

1. Sweet success in targeting sugar molecules to cells in living animals
2. The first engineering of cell surfaces in living animals
3. New comprehensive textbook on companion animals fills need
4. Why some animals have smaller eyes: Lifestyle matters
5. Social benefits of wound healing may not make any difference in animals with multiple partners
6. Firefly compound lights up protein dance in living animals
7. Japanese researchers develop novel method of introducing transgenes into animals
8. Researchers make promiscuous animals monogamous by manipulating genes
9. UIC researchers discover gene that causes liver cancer in animals
10. Mix of chemicals plus stress damages brain, liver in animals and likely in humans
11. Study in worms shows how genes linked to complexity in animals

Post Your Comments:

(Date:10/27/2015)... , Oct. 27, 2015 In the ... issues of concern for various industry verticals such as ... due to the growing demand for secure & simplified ... various ,sectors, such as hacking of bank accounts, misuse ... electronic equipment such as PC,s, laptops, and smartphones are ...
(Date:10/27/2015)... Synaptics Inc. (NASDAQ: SYNA ), the leader ... adopted the Synaptics ® ClearPad ® Series ... newest flagship smartphones, the Nexus 5X by LG and ... --> --> Synaptics works closely with ... in the joint development of next generation technologies. Together, ...
(Date:10/26/2015)... LAS VEGAS , Oct. 26, 2015 ... an innovator in modern authentication and a founding member ... launch of its latest version of the Nok Nok™ ... to use standards-based authentication that supports existing and emerging ... Suite is ideal for organizations deploying customer-facing applications that ...
Breaking Biology News(10 mins):
(Date:11/25/2015)... , ... November 25, 2015 , ... ... uBiome, were featured on AngelList early in their initial angel funding process. Now, ... syndicate for individuals looking to make early stage investments in the microbiome space. ...
(Date:11/24/2015)... (PRWEB) , ... November 24, 2015 , ... The United ... recipient of the 2016 USGA Green Section Award. Presented annually since 1961, the USGA ... his or her work with turfgrass. , Clarke, of Iselin, N.J., is ...
(Date:11/24/2015)... , Nov. 24, 2015 Halozyme Therapeutics, Inc. (NASDAQ: ... in New York on Wednesday, December 2 ... Torley , president and CEO, will provide a corporate overview. ... York at 1:00 p.m. ET/10:00 a.m. PT . ... relations, will provide a corporate overview. --> th ...
(Date:11/24/2015)... ... November 24, 2015 , ... ... But unless it is bound to proteins, copper is also toxic to cells. ... at Worcester Polytechnic Institute (WPI) will conduct a systematic study of copper in ...
Breaking Biology Technology:
Cached News: