The Canadian

Centre for Environmental Modelling and Chemistry

Foodweb Model

Version 2.00 - March 2006

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. An eight-species foodweb in Lake Ontario is supplied. Other aquatic systems can be entered as desired to treat any number of organisms up to 9 organisms. The output gives the prevailing concentrations throughout the foodweb as well as detailed uptake/clearance data for each species.

Based on the following publications:

Campfens, J., Mackay D. 1997. Fugacity-Based Model of PCB Bioaccumulation in Complex Aquatic Food Webs. Environ. Sci. Technol. 31: 577-583.

Features of the FoodWeb Software

Provides three databases: chemical properties, lake properties, and foodweb properties (including organis properties).
Permits temporary additions/changes of each item and their properties to a simulation.
Permits permanent additions, changes and deletions of items and their properties in each database.
Provides context-sensitive Help.
Displays and prints the FoodWeb model calculations, as performed by the program.
Allows the printing of simulation tables and the summary diagram.
Allows the program results to be saved as a comma separated value text file, easily viewed with standard spreadsheet software.

The required input data are:

  • chemical name
  • molar mass
  • Henry's law constant (an arbitrary value is acceptable if unknown)
  • log Kow
  • Lake

  • suspended particulate matter concentration
  • volume fraction sediment solids
  • organic carbon content of suspended matter and sediment particles
  • densities of solids

    Food Web

  • number of organisms (maximum of 9)
  • organism name, volume, lipid volume fraction
  • organism biotransformation half-life, digestion factor, growth rate
  • organism feeding rate, fractional respiration rates (water and sediment), gut absorption efficiency parameters (water and lipid)
  • dietary preferences as a feeding matrix

    Environmental Concentrations

  • chemical concentration in the water column and the sediment
  • Model output includes:

  • chemical properties, lake parameters
  • food web and organism parameters
  • steady-state environmental concentrations and fugacities
  • Z and D values
  • concentrations and fugacities of each species
  • details of process rates, including net contaminant flux from prey to consumer
  • a summary diagram
  • charts of organism concentration and fugacity ratio with respect to water

    Minimum system requirements are an IBM-compatible PC running Windows 98 or XP. This model will not run under Windows NT or 2000.

    For non-Windows users, FoodWeb Version 1, released 1997, continues to be available.

    Please read the FoodWeb SOFTWARE LICENSE before downloading the software. Use of the software constitutes your agreement to abide by the terms and conditions set out in the license agreement.


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    Last updated June 10, 2013.