Document Detail

Control of CNP homeostasis in herbivore consumers through differential assimilation.
MedLine Citation:
PMID:  15210314     Owner:  NLM     Status:  MEDLINE    
Stoichiometric analysis recognizes that a herbivore is a mixture of multiple chemical elements, especially C, N, and P, that are fixed in various proportions. In the face of a variable quality food supply, herbivores must regulate ingested nutrients to maintain a homeostatic state. We develop a dynamic mathematical model, based on differential assimilation, that controls the C:N and C:P ratios in a herbivore within given tolerance ranges; the actual mathematical mechanism is to define the absorption coefficients to be dependent on these elemental ratios. The model inputs variable, time-dependent food and grazing rates and calculates the net dynamic consumer production (growth) of C, N, and P. It shows that total growth is equally sensitive to variations in both food quality and in assimilation rates, and it shows quantitatively how C-, N-, or P-limited growth could occur at different periods during the development period. The analysis generalizes earlier work limited to just two elements.
J David Logan; Anthony Joern; William Wolesensky
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Bulletin of mathematical biology     Volume:  66     ISSN:  0092-8240     ISO Abbreviation:  Bull. Math. Biol.     Publication Date:  2004 Jul 
Date Detail:
Created Date:  2004-06-22     Completed Date:  2005-06-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401404     Medline TA:  Bull Math Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  707-25     Citation Subset:  IM    
Department of Mathematics, University of Nebraska, P.O. Box 880323, Lincoln NE 68588-0323, USA.
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MeSH Terms
Carbon / metabolism*
Computer Simulation
Feeding Behavior / physiology
Homeostasis / physiology
Insects / metabolism*
Models, Biological*
Nitrogen / metabolism*
Phosphorus / metabolism*
Reg. No./Substance:
7440-44-0/Carbon; 7723-14-0/Phosphorus; 7727-37-9/Nitrogen

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

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