E-3. 



Frequency histograms of density (no./m=) at age for selected unionid species from Case-IH 

 (RM 488.5) in Reach 15 of the Upper Mississippi River, 1994. Unionids were collected 

 from 72 quantitative samples covering a surface area of 18 m- 



Estimated Age (years) 



1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 



zo 



1.6 



1.2 



as 

 a-i 



0.0 



as 

 a6 

 a4 

 a2 

 ao 

 a4 

 aa 

 a2 

 ai 

 ao 

 a4 

 as 

 a2 

 ai 

 ao 



2.5 

 2.0t 

 1.5 

 1.0 



as 

 ao 



1.6 

 1.2 



as 

 a 4 

 ao 



1.6 

 1.2 



as 

 a 4 

 ao 



_mm 



DQ 



Amhlcma p lie at a 

 x=14.0/m^ 



nnnmnnr 



il^mcp , n^ «^ 







Megalonaias nervosa 

 x=3.6/m^ 



Ddd 



nrir^nrnnnFlnnnr 



.. ^[]o p [ 



Quadrula quadrula 

 x=2.6/m^ 



nn. 



Quadrula metanevra 

 x=0.8/m^ 



nRHnn H n 



nnn 



n 



n 



Quadrula pustulosa 

 x=21.0/m^ 



nnn^r^ 



Ellipsaria Uneolata 

 x=13.8/m^ 



t.^.] L.,.l [^ i ~T^ -^ r^y, r 



D 



Obliquaria reflexa 

 x=9.2/m^ 



Q 



a 



> 11 13 15 17 19 21 23 25 27 29 31 33 35 



Estimated Age (years) 

 Page E-8 



Whitney et al , Unionid Sun.-ev - Reach 1 5 UMR 



