NEARSHORE 



INNER 

 OFFSHORE 



* 



Dendroster 



6m 



Paraphoxus Sp cf 

 grandis - h 



FISHERY BULLETIN: VOL. 78, NO. 2 



OFFSHORE 



lOOm 



— I 



~ rO 



M-2 



9m 





M-4 

 18 m 



i 



'tests 



Wood ctiips /, ^„,„„,, 

 fecQlpell 



ets <, 





,M-5 



24mN 



•10 

 M 

 20 



30 



P obtusidens 



P lucubrans 



P epistomus 



Pdaboius 



\- - 



500 



Figure 2. — Schematic profile of the beach along the southern transect showing sediment profiles from long cores and the zonation of 



paraphoxid amphipods in Monterey Bay, Calif. 



Table l. — Characteristics of the surface sediments along southern (M) and northern (N) transects in 

 Monterey Bay, Calif, (mean ± 95% confidence limits). 



'(A = -log (median diameter). 



^Folk and Ward (1957); tiigtier coefficient equals poorer sorting. 



water depth, the primary sediment movements 

 were caused by waves intercepting a shoaling bot- 

 tom. 



An increase in wave height and a decrease in 

 wave period both cause an increase in the velocity 

 of sediment movement (Komar 1976). As a result, 



winter wave conditions should cause the greatest 

 sediment motion ( Figure 3 ). Hundreds of dives and 

 years of qualitative observations of wave activity 

 indicated a strong gradient in substrate move- 

 ment with changing depth along the sandflats as 

 well as considerably greater sediment motion dur- 



440 



