Document Detail


Gravity and the evolution of cardiopulmonary morphology in snakes.
MedLine Citation:
PMID:  22079804     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Physiological investigations of snakes have established the importance of heart position and pulmonary structure in contexts of gravity effects on blood circulation. Here we investigate morphological correlates of cardiopulmonary physiology in contexts related to ecology, behavior and evolution. We analyze data for heart position and length of vascular lung in 154 species of snakes that exhibit a broad range of characteristic behaviors and habitat associations. We construct a composite phylogeny for these species, and we codify gravitational stress according to species habitat and behavior. We use conventional regression and phylogenetically independent contrasts to evaluate whether trait diversity is correlated with gravitational habitat related to evolutionary transitions within the composite tree topology. We demonstrate that snake species living in arboreal habitats, or which express strongly climbing behaviors, possess relatively short blood columns between the heart and the head, as well as relatively short vascular lungs, compared to terrestrial species. Aquatic species, which experience little or no gravity stress in water, show the reverse - significantly longer heart-head distance and longer vascular lungs. These phylogenetic differences complement the results of physiological studies and are reflected in multiple habitat transitions during the evolutionary histories of these snake lineages, providing strong evidence that heart-to-head distance and length of vascular lung are co-adaptive cardiopulmonary features of snakes.
Authors:
Harvey B Lillywhite; James S Albert; Coleman M Sheehy; Roger S Seymour
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-11-04
Journal Detail:
Title:  Comparative biochemistry and physiology. Part A, Molecular & integrative physiology     Volume:  161     ISSN:  1531-4332     ISO Abbreviation:  Comp. Biochem. Physiol., Part A Mol. Integr. Physiol.     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2011-12-19     Completed Date:  2012-04-13     Revised Date:  2013-06-27    
Medline Journal Info:
Nlm Unique ID:  9806096     Medline TA:  Comp Biochem Physiol A Mol Integr Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  230-42     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Inc. All rights reserved.
Affiliation:
Department of Biology, University of Florida, Gainesville, FL 32611, USA. hblill@ufl.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Biological Evolution*
Gravitation*
Heart / anatomy & histology
Least-Squares Analysis
Lung / anatomy & histology
Phylogeny
Quantitative Trait, Heritable
Snakes / anatomy & histology*,  physiology
Grant Support
ID/Acronym/Agency:
R01 HL033821-05/HL/NHLBI NIH HHS
Comments/Corrections

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