Document Detail

Physiological flexibility and climate change: The case of digestive function regulation in lizards.
MedLine Citation:
PMID:  21320629     Owner:  NLM     Status:  Publisher    
Our planet is undergoing fast environmental changes, which are referred as global change. In this new scenario, it is of paramount relevance to understand the mechanistic basis of animal responses to environmental change. Here we analyze to what extent seasonal changes in the digestive function of the lizard Liolaemus moradoensis is under endogenous (i.e., hard wired) or exogenous (i.e., environmentally determined) control. For this purpose we compared animals collected in the field during autumn, winter and summer, against (experimental) specimens collected in the field at the beginning of autumn and reared in the laboratory under simulated summer conditions until winter. We found that different aspects of the digestive function are under different types of control: small intestine length appears to be under endogenous control (i.e., experimental animals were similar to winter animals), small intestine mass appears to be under exogenous control (i.e., experimental animals were similar to summer animals), and specific enzyme activities did not change throughout the year. Thus, we suspect that processes related with gut length, such as cell division, may be under endogenous control, while others related with gut mass, such as enterocytes size and content, may be determined by exogenous factors, such as the presence of food in the intestinal lumen. Faced with accelerated changing conditions, the ability of vertebrates to cope will be closely related with their plasticity in fitness-associated traits. More studies aimed at determining the levels and limits of physiological flexibility will be necessary to understand this phenomenon.
Daniel E Naya; Claudio Veloso; Pablo Sabat; Francisco Bozinovic
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-2-11
Journal Detail:
Title:  Comparative biochemistry and physiology. Part A, Molecular & integrative physiology     Volume:  -     ISSN:  1531-4332     ISO Abbreviation:  -     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-2-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9806096     Medline TA:  Comp Biochem Physiol A Mol Integr Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2010. Published by Elsevier Inc.
Sección Evolución - Facultad de Ciencias and Centro Universitario de la Regional Este, Universidad de la República, Montevideo, Uruguay; Center for Advanced Studies in Ecology & Biodiversity and Departamento de Ecología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.
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