L-8 
Figure 3. Diagnostic discriminant tool results and an interpolation fitting algorithm were 
used to classify Baltimore Harbor benthic communities into categories distinguished by 
the type of stress experienced by those communities. Red shading indicates degraded 
benthic communities stressed by toxic contamination (posterior probability in 
Contaminant Group > 0.5), with higher color intensity indicating higher probabilities of 
contaminant effects (>0.5 to <0.7; > = 0.7 to <0.9; > = 0.9). Salmon shading indicates 
degraded benthic communities stressed by other sources, most likely low dissolved oxy¬ 
gen (posterior probability in Contaminant Group <=0.5). Green indicates good benthic 
community condition. Middle Branch (mb), Curtis Creek (cc), Stony Creek (sc), and Bear 
Creek (be) show contamination as likely source of stress. The deep basin north of Curtis 
Bay and the deep channel southwest of Sparrows Point (sp) shows other stress (low DO) 
as probable cause of degradation. 
appendix I 
Addendum to the Report 
