SHELL DAMAGE 



LIVE AMBLEMA PLiCATA COLLECTED IN 1984 



Note: Numbers at the top of bars indicate the total number of 

 live Amblema plicata collected from the plot in 1984. 



DOWNSTREAM = unfleeted plot, downstream control 



UPSTREAM = unfleeted plot, upstream control 



GROUNDED = fleeted plot, barges against shore 



Figure 5. Shell damage rates for live Amblema plicata collected 

 in 1984 from fleeted and unfleeted plots in the 

 Illinois River at Naples. 



31 



