Document Detail


Comparative non-shivering thermogenesis in adjacent populations of the common spiny mouse (Acomys cahirinus) from opposite slopes: the effects of increasing salinity.
MedLine Citation:
PMID:  11824399     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We compared non-shivering thermogenesis between two adjacent populations of the common spiny mouse Acomys cahirinus from different habitats, in relation to increasing salinity. Individuals were captured from the north- and south-facing slopes of the same valley, that represent "Mediterranean" and "desert" habitats, respectively. We hypothesized that the two populations of mice would differ in their thermoregulatory capacities, reflecting their need to cope with the environmental stress in each habitat. We measured resting metabolic rate by recording oxygen consumption, body temperature and response to an injection of exogenous noradrenaline. Mice were maintained on diets with increasing levels of salt intake to examine their abilities to cope with increasing osmotic stress. Mice from north-facing slopes generally had a higher resting metabolic rate and a higher increase in oxygen consumption in response to noradrenaline than mice from south-facing slopes. Increasing salinity decreased resting metabolic rate values, body temperature, and oxygen consumption in response to noradrenaline in both populations, and diminished slope-dependant differences. We suggest that these differences could be a result of an ongoing adaptive process to different climatic conditions, typical of the Mediterranean region, that are a demonstrable example of evolution in action.
Authors:
Michael Scantlebury; Daniel Afik; Uri Shanas; Abraham Haim
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology     Volume:  172     ISSN:  0174-1578     ISO Abbreviation:  J. Comp. Physiol. B, Biochem. Syst. Environ. Physiol.     Publication Date:  2002 Jan 
Date Detail:
Created Date:  2002-02-04     Completed Date:  2002-07-11     Revised Date:  2009-06-08    
Medline Journal Info:
Nlm Unique ID:  8413200     Medline TA:  J Comp Physiol B     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1-5     Citation Subset:  IM    
Affiliation:
Department of Biology, University of Haifa at Oranim, Tivon, Israel.
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MeSH Terms
Descriptor/Qualifier:
Animals
Basal Metabolism / drug effects,  physiology
Body Temperature Regulation / drug effects*,  physiology*
Body Weight
Desert Climate
Mediterranean Region
Muridae
Oxygen Consumption / drug effects,  physiology
Shivering
Sodium Chloride, Dietary / pharmacology*
Chemical
Reg. No./Substance:
0/Sodium Chloride, Dietary

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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