Figure E-5. Frequency histograms of density (no./m^) at age for selected unionid species from 



Illiniwek(RM 492.4) in Reach 15 of the Upper Mississippi River, 1994-95. Unionids 

 were collected from 98 quantitative samples covering a surface area of 29 m*. 



Estimated Age (years) 



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



1.2 

 1.0 

 0.8 

 0.6 

 0.4 

 0.2- 

 0.0 



0.4 1 



0.3 



0.2 



0.1 



0.0 



0.4 



0.3 



0.2 



0.1 



0.0 



0.4 



0.3 



0.2 



0.1 



0.0 



2.5 



2.0 



1.5 



1.0 



0.5 



0.0 



4.0 



3.0 



2.0-t 



1.0 



0.0 



1.6 



1.2 



0. 



0.4 



0.0 



Mm 



Amblema pUcata 

 x=10.3/m^ 



DnnnnHn 



nFlr^^F^I. 



Pin 



DnO 



Megalonaias nervosa 

 x=2.8/m^ 



J\nW. 



rfl 



r— It II 1r-i 



JL 



JL 



Quadrula quadrula 

 x=1.3/m^ 



lln'nrinFln'Rn 



n^ __ m ^ pp^ 



Quadrula metanevra 

 x=0.3/m^ 



-^3 CyiF?aF^^a _ rmr^ 



m 



Quadrula pustulosa 

 x=16.2/m^ 



QIQ 



uU 



F"1 rp r^ -^ r-n ^ -, 



J 



Ellipsarla Uneolata 

 x=35.0/m^ 



E 



IFirpr^m ^ 



Ohllquaria reflexa 

 x=9.9/m^ 



^nrp. 



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



Estimated Age (years) 

 Page E-13 



Whitney et al , Unionid Survey - Reach 1 5 UMR 



