Record Display for the EPA National Library Catalog

RECORD NUMBER: 249 OF 715

OLS Field Name OLS Field Data
Main Title Extinction and Persistence in Models of Population-Toxicant Interactions (Journal Version).
Author Hallam, T. G. ; de Luna, J. T. ;
CORP Author Tennessee Univ., Knoxville. Dept. of Mathematics.;Environmental Research Lab., Athens, GA.
Publisher c1984
Year Published 1984
Report Number EPA/600/J-84/416;
Stock Number PB89-134811
Additional Subjects Toxicology ; Population dynamics ; Exposure ; Mathematical models ; Body burden ; Concentration(Composition) ; Reprints ; Environmental pollution
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB89-134811 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/08/1989
Collation 10p
Abstract
Recent qualitative studies of the effects of toxicants on populations have resulted in conjectures about the role played by a dose-response function in determining the existence of multiple equilibrium states, consequences of modeling chemical dynamics by first order laws, and problems arising when uptake or toxicant can occur through both environmental and food chain pathways. A brief synthesis, focusing on the sensitivity of the models to the representation of the population, of these studies is presented. Then, some new persistence-extinction results for resource-consumer-toxicant interactions are indicated. An analytical approach is used to address a set of generic models each employing a dynamic submodel of the population, a dynamic formulation for environmental concentration of a toxicant, and a dynamic concentration of toxicant in the individual organisms. Conclusions, derived from the models by analytic techniques, are phrased in terms of system level parameters that govern persistence or extinction of the model population. (Copyright (c) 1984 Elsevier Science Publishers B.V.)