Record Display for the EPA National Library Catalog

RECORD NUMBER: 414 OF 723

OLS Field Name OLS Field Data
Main Title Non-autonomous Logistic Equations as Models of Populations in a Deteriorating Environment.
Author Hallam, T. G. ; Clark, C. E. ;
CORP Author Tennessee Univ., Knoxville.;Environmental Research Lab., Athens, GA.
Year Published 1981
Report Number EPA-R-806726; EPA-600/J-81-682;
Stock Number PB84-172410
Additional Subjects Population growth ; Mathematical models ; Biostatistics ; Ecology ; Reprints ; Environmental effects
Holdings
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Status
NTIS  PB84-172410 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 11p
Abstract
The non-autonomous logistic equation is studied under conditions that include an environment which is completely deteriorating. A re-interpretation of the parameters of the logistic equation leads to an alternative logistic formulation. A biological interpretation of the parameters is presented and this equation is compared with the classical logistic model in the case where the parameters are constant. In general, the alternative formulation seems to be the more reasonable model in situations where perturbations lead to severe decreases in environmental quality and growth rates.