1. General Model Information


Acronym: FOODWEB

Main medium: aquatic
Main subject: toxicology, biogeochemistry
Organization level: ecosystem
Type of model: compartment model
Main application:
Keywords: aquatic foodweb, contaminant, partition, freshwater, PCB, lake


Environmental Modelling Centre
1600 West Bank Drive, Peterborough, Ontario, Canada, K9J 7B8



This is a mass balance model of contaminant flux through an aquatic foodweb. The dietary preference of each species is expressed in the form of a predator/prey matrix. The model is in BASIC and as supplied treats PCBs in an eight-species foodweb in Lake Ontario. It can be modified to address other situations as desired and can treat any number of organisms. The output gives the prevailing concentrations throughout the foodweb as well as detailed uptake/clearance data for each species.

Since this is a novel model any comments and criticisms will be welcome at "Foodweb Comments".

The paper describing this model was published in Environmental Science and Technology, Vol 31, p. 577-583, 1997.

System requirements to run the compiled program are minimal.

II. Technical Information

II.1 Executables:

Operating System(s):
  • download Foodweb

    II.2 Source-code:

    Programming Language(s):

    II.3 Manuals:

    II.4 Data:

    III. Mathematical Information

    III.1 Mathematics

    III.2 Quantities

    III.2.1 Input

    The required input data are:
    Chemical Properties:
  • chemical name
  • molecular mass
  • Henry's Law constant
  • log Kow
  • chemical concentration in the water column and the sediment
  • Lake Properties:

  • suspended particulate matter concentration
  • volume fraction sediment solids
  • organic carbon content of suspended matter and sediment particles
  • Organism Properties:

  • number of species
  • organism name, volume, lipid volume fraction, metabolic half-life, digestion factor, growth rate, feeding rate, fractional respiration rates, gut absorption efficiency parameters, and diet
  • III.2.2 Output

    Model output includes:
  • Z values
  • net contaminant flux from prey to consumer
  • steady state environmental concentrations and fugacities
  • concentrations and fugacities of each species

  • IV. References

    The paper describing this model was published in Environmental Science and Technology, Vol 31, p. 577-583, 1997.

    V. Further information in the World-Wide-Web

  • Available Models at the Environmetal Modelling Centre
  • Foodweb

    VI. Additional remarks

    Last review of this document by:
    Status of the document:
    last modified by Tobias Gabele Wed Aug 21 21:44:42 CEST 2002

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