Document Detail


Effects of meal size, meal type, body temperature, and body size on the specific dynamic action of the marine toad, Bufo marinus.
MedLine Citation:
PMID:  12601612     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Specific dynamic action (SDA), the accumulated energy expended on all physiological processes associated with meal digestion, is strongly influenced by features of both the meal and the organism. We assessed the effects of meal size, meal type, body temperature, and body size on the postprandial metabolic response and calculated SDA of the marine toad, Bufo marinus. Peak postprandial rates of O(2) consumption (.V(O2)) and CO(2) production (.V(CO2)) and SDA increased with meal size (5%-20% of body mass). Postprandial metabolism was impacted by meal type; the digestion of hard-bodied superworms (Zophobas larva) and crickets was more costly than the digestion of soft-bodied earthworms and juvenile rats. An increase in body temperature (from 20 degrees to 35 degrees C) altered the postprandial metabolic profile, decreasing its duration and increasing its magnitude, but did not effect SDA, with the cost of meal digestion remaining constant across body temperatures. Allometric mass exponents were 0.69 for standard metabolic rate, 0.85 for peak postprandial .V(O2), and 1.02 for SDA; therefore, the factorial scope of peak postprandial .V(O2) increased with body mass. The mass of nutritive organs (stomach, liver, intestines, and kidneys) accounted for 38% and 20% of the variation in peak postprandial .V(O2) and SDA, respectively. Toads forced to exercise experienced 25-fold increases in .V(O2) much greater than the 5.5-fold increase experience during digestion. Controlling for meal size, meal type, and body temperature, the specific dynamic responses of B. marinus are similar to those of the congeneric Bufo alvarius, Bufo boreas, Bufo terrestris, and Bufo woodhouseii.
Authors:
Stephen M Secor; Angela C Faulkner
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Physiological and biochemical zoology : PBZ     Volume:  75     ISSN:  1522-2152     ISO Abbreviation:  Physiol. Biochem. Zool.     Publication Date:    2002 Nov-Dec
Date Detail:
Created Date:  2003-02-25     Completed Date:  2003-06-17     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100883369     Medline TA:  Physiol Biochem Zool     Country:  United States    
Other Details:
Languages:  eng     Pagination:  557-71     Citation Subset:  IM    
Affiliation:
Department of Biology, University of Mississippi, University, MS 38677, USA. ssecor@biology.as.ua.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Body Temperature*
Body Weight*
Bufo marinus / physiology*
Diet*
Digestive System Physiological Phenomena
Energy Metabolism
Feeding Behavior*
Heart / physiology
Kidney / physiology
Liver / physiology
Lung / physiology
Organ Size
Oxygen Consumption
Postprandial Period / physiology
Time Factors

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


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