Table E-2. Density distributions based on estimated age for selected unionid species from Sylvan 

 Slough (RM 485.8) in Reach 15 of the Upper Mississippi River, 1987. Unionidswere 

 collected from 8 quantitative samples covering a surface area of 8 m^. 



Mean 6.50 14.50 



.30 9.00 28.40 6.10 



4.90 



Whitney 



Page E-6 



al,, Unionid Sun-'ev - Reach 15 UMR 



