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CADDIS Volume 3: Examples & Applications


Metals Species Sensitivity Distribution Gallery

The Metals Species Sensitivity Distribution (SSD) Gallery is a gallery of SSDs (Figure 1) and source data. SSDs model the variation in the sensitivity of different species to a stressor and are usually created using data from laboratory toxicity tests. SSDs assist in the interpretation of site data for stressor identification and risk assessment by relating them to the proportion of species expected to be affected at prescribed concentrations.

SSD plot
Figure 1. Example Species Sensitivity Distribution for cadmium.

Where are the source data for these plots?

The source data used to generate the models in the gallery were extracted from the U.S. Environmental Protection Agency's ECOTOX database and sorted to create SSDs with relatively consistent biology, water chemistry and duration. The metals covered include arsenic, cadmium, chromium, copper, lead, mercury, nickel, selenium and zinc. See U.S. EPA (2005) for more detail on the methods used in the analysis.

What if I want to modify an SSD for use in my causal analysis?

The source data in the gallery can be entered into the CADDIS SSD generator to construct custom SSDs, which place stressor concentration data from your site in the context of concentration-response data you select for inclusion in an SSD. You may use your own data, data from the ECOTOX database or data from the CADDIS Metals SSD Library with the SSD generator tool.

Download and browse the gallery

To download the gallery and supporting information:

  1. Save Metals SSD Gallery - V1 (4.5mb, .zip) to your computer.
  2. Unzip the file by right clicking on the folder and selecting "extract all" to invoke the extraction wizard.

To browse the gallery and supporting information:

  1. Open the file titled Start Here - Metals SSD Gallery - V1.xls
  2. Locate the plots and source data of interest using the Browse the Metals SSD Gallery worksheet.

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