Record Display for the EPA National Library Catalog


Main Title Size dependent model of hazardous substances in aquatic food chain /
Author Thomann, Robert V.
CORP Author Manhattan Coll., Bronx, N.Y.;Environmental Research Lab.,-Duluth, Minn.
Publisher Environmental Research Laboratory - Duluth, Office of Research and Development, U.S. Environmental Protection Agency, National Technical Information Service [distributor],
Year Published 1978
Report Number EPA-600/3-78-036; EPA-R-803680
Stock Number PB-281 009
OCLC Number 06683389
Subjects Water--Pollution ; Food chains (Ecology)--Mathematical models
Additional Subjects Hazardous materials ; Water pollution ; Lakes ; Mathematical models ; Food chains ; Marine microorganisms ; Fishes ; Size determination ; Bioassay ; Absorption ; Biomass ; Excretion ; Biphenyl ; Hydrocarbons ; Concentration(Composition) ; Accumulation ; Lake Ontario ; Biphenyl/chloro ; Polychlorinated biphenyls
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA 600-3-78-036 c.1 Headquarters Library/Washington,DC 05/02/2014
EKCD  EPA-600/3-78-036 CEMM/GEMMD Library/Gulf Breeze,FL 06/26/2018
ELBD ARCHIVE EPA 600-3-78-036 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ELDD  EPA-600/3-78-036 CCTE/GLTED Library/Duluth,MN 05/04/2001
ESAD  EPA 600-3-78-036 Region 10 Library/Seattle,WA 07/19/2005
NTIS  PB-281 009 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation viii, 40 pages : illustrations ; 28 cm.
A model of toxic substance accumulation is constructed that introduces organism size as an additional independent variable. The model represents an ecological continuum through size dependency; classical compartment analyses are therefore a special case of the continuous model. Size dependence is viewed as a very approximate ordering of trophic position. The analysis of some PCB data in Lake Ontario is used as an illustration of the theory. A completely mixed water volume is used. Organism size is considered from 100 micrometers to 1,000,000 micrometers. PCB data were available for 64 micrometers net hauls, alewife, smelt, sculpin and coho salmon. The analysis indicated that about 30% of the observed 6.5 micrograms PCB/gm fish as the coho salmon size range is due to transfer from lower levels in the food chain and about 70% from direct water intake. The model shows rapid accumulation of PCB with organism size due principally to decreased excretion rates and decreased biomass at higher trophic levels.
"April 1978." Includes bibliographical references (pages 36-39). "Contract no. R803680030." Microfiche