Table G-5. Regression equation parameters of morphological measurements from mussels collected at 

 Illiniwek site (RM 492.4), 1994-95. The relationship between morphological measurements 

 were best described by a power regression equation (y = ax^b). Equation parameters are as 

 follows : y = dependent variable; x = independent variable; a = y intercept; b = regression 

 coefficient (slope); r- = coefficient of determination; and n = number of individuals plotted. 



Example: Calculate the shell width and height ofanAmblema plicata (Three ridge) with a shell length of 92.56 mra {y = ax'^b) 

 width = 0.8195 >: 92. 56^0.9065 = 49.67 mm - 25 4 mm/iirh = 1.96 inch 

 height = 1.0722 x 92 56'X).9302 = 72.35 mm - 25.4 mm/inch = 2.85 inch 



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Whitney et al.. Unionid Sunev - Reach 15 UMR 



