The susceptibility of each SGCN to each threat was primarily assessed based on information found in scientific literature. The categories of susceptibility assigned to each threat-species association were High, Medium, Low, None (not a threat to the species) and Unknown (a threat, but susceptibility of the species to the threat is unknown). Some susceptibility values were later revised based on review by species experts and discussions with natural resource professionals.

The 'Associated Threats' identified in the SGCN summaries include all categories of susceptibility, except "None." Threats to which species are believed to be less susceptible should also be monitored to ensure they do not become more significant problems in the future.

The following PDF documents provide associations between SGCN and threats and further classify the data by level of SGCN susceptibility to the threat.