Density distributions based on estimated age for selected unionid species from Sylvan 

 Slough (RM 485.8) in Reach 15 of the Upper Mississippi River, 1994-95. Unionids were 

 collected from 1 16 quantitative samples covering a surface area of 34 m^. 



Mean 3.25 2.24 



1.85 



4.42 14.15 



6.80 



3.94 



Page E-4 



Whitney et al., Unionid Survey - Reach 1 5 UMR 



