Abundance 



1 500- 



\m%i 



smi 



Bionass 



Abundance 



1500- 



1000L 



580- 



lomass 



Fig. 6.5 Pontoporeia f emor ata at stations 20 and 21, 



2 

 -■£.! — abundance (no./m ) 



2 

 — £• — biomass (g/m ) 



106 



