| Daily rhythms of body temperature and activity in free-living Black-tailed Tree Rats (Thallomys nigricauda) along an aridity gradient. | |
MedLine Citation:
|
PMID: 19836407 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Since Black-tailed Tree Rats, Thallomys nigricauda, face variable thermal environments in their extensive range in southern Africa, variation in their physiological and behavioural responses to the wide range of ambient temperatures (T(a)s) was expected to play a role in the success and range of the species. Body temperature (T(b)) and activity patterns of free-ranging Tree Rats were investigated during winter and summer at three study sites along an aridity gradient. We measured abdominal T(b) using implanted iButtons. All but three Tree Rats displayed significant 24h T(b) rhythmicity. The T(b) range for Tree Rats was 32.33-40.63 degrees C (n=13) and 32.69-40.15 degrees C (n=17) in winter and summer respectively. Although there was variation in T(b) profiles, Tree Rats generally displayed a bimodal distribution of T(b), with high and low T(b) values during scotophase and photophase respectively. Site had no effect on the range of T(b) in winter. Range in T(b) was significantly greater in winter, when Tree Rats reduced their minimum T(b). Maximum amplitudes of daily rhythms of T(b) were 259.7% of expected values. Temperatures of cavities were more stable compared with operative temperature. In winter male Tree Rats spent a significantly greater proportion of the active phase away from their home cavity compared with females. It is suggested that the energy savings in Tree Rats are a result of a combination of physiological and behavioural mechanisms allowing them to maintain nocturnal activity in winter and overall energy balance. |
Authors:
|
Joy C Coleman; Colleen T Downs |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
|
Title: Physiology & behavior Volume: 99 ISSN: 1873-507X ISO Abbreviation: Physiol. Behav. Publication Date: 2010 Jan |
Date Detail:
|
Created Date: 2009-12-17 Completed Date: 2010-03-01 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 0151504 Medline TA: Physiol Behav Country: United States |
Other Details:
|
Languages: eng Pagination: 22-32 Citation Subset: IM |
Affiliation:
|
School of Biological and Conservation Sciences, P/Bag X01, Scottsville, Pietermaritzburg, 3209, Scottsville, South Africa. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Body Temperature Regulation / physiology* Circadian Rhythm / physiology* Environment Female Male Motor Activity / physiology* Muridae / physiology* Seasons Sex Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: The role of face shape and pigmentation in other-race face perception: An electrophysiological study...
Next Document: Change and maintenance of variation in quantitative traits in the context of the Price equation.